Category Archives: Computer

Mikrotik Guest Network

I’ve got several AccessPoints in my network.
Using a roaming setup, clients can connect to strongest AP.

For our Folkband i’ve setup same.
With the exception of those clients only being able to connect to the Internet, and not the rest of my Network

  • Virtual Access Point
  • Own subnet
  • dhcp server only for this access point
  • NAT and Firewall rules for access limitation
/interface bridge 
add name=bridgeguest
/interface wireless security-profiles 
add authentication-types=wpa2-psk eap-methods="" management-protection=allowed mode=dynamic-keys name=guest supplicant-identity=MikroTikHAP wpa2-pre-shared-key=guestkey
/interface wireless
add disabled=no mac-address=MACADDRESS master-interface=wlan1 name=guest security-profile=guest ssid=guest station-roaming=enabled wds-default-bridge=bridge wps-mode=disabled
/ip pool
add name=guest ranges=10.5.0.2-10.5.0.250
/ip dhcp-server
add address-pool=guest disabled=no interface=bridgeguest name=dhcpserverguest
/interface bridge port
add bridge=bridgenb interface=guest
/ip address
add address=10.1.0.5/24 comment=defconf interface=ether2 network=10.1.0.0
add address=10.5.0.1/24 interface=bridgeguest network=10.5.0.0
/ip dhcp-client
/ip dhcp-server network
add address=10.5.0.0/24 dns-server=1.1.1.1 gateway=10.5.0.1
/ip dns static
add address=10.1.0.5 name=router.lan type=A
/ip firewall filter
add action=drop chain=input dst-address=10.1.0.5 dst-port=22,80,443,8291,21,23 protocol=tcp src-address=10.5.0.1-10.5.0.254
add action=drop chain=input dst-address=MYNETWORKSHERE/16 src-address=10.5.0.2-10.5.0.250
add action=drop chain=forward dst-address=MYNETWORKSHERE/16 src-address=10.5.0.2-10.5.0.250
add action=drop chain=forward dst-address=MYNETWORKSHERE/16 src-address=10.5.0.2-10.5.0.250
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none out-interface-list=WAN
add action=accept chain=srcnat src-address=10.5.0.0/24

DDC i2c monitor control

I wanted to control the input of my monitors, these are my findings.

DDC – Display Data Channel
I2C – (Inter-Integrated Circuit, eye-squared-C), alternatively known as IIC, is a synchronous, multi-master/multi-slave (controller/target) bus

Getting monitor information with the ddccontrol -p command

##### PART OF THE OUTPUT #####
Detected monitors :
 - Device: dev:/dev/i2c-9
   DDC/CI supported: Yes
   Monitor Name: VESA standard monitor
   Input type: Digital
  (Automatically selected)
 - Device: dev:/dev/i2c-7
   DDC/CI supported: Yes
   Monitor Name: VESA standard monitor
   Input type: Digital
 - Device: dev:/dev/i2c-6
   DDC/CI supported: Yes
   Monitor Name: VESA standard monitor
   Input type: Digital
Reading EDID and initializing DDC/CI at bus dev:/dev/i2c-9...
I/O warning : failed to load external entity "/usr/share/ddccontrol-db/monitor/AOC2490.xml"

Switching inputs

ddcutil -b 7 setvcp 0x60 0x11 # 7 is Second monitor (starts with 6), 0x60 is the input register (see below) and 0x11 is HDMI
ddcutil -b 6 setvcp 0x60 0x0f # First monitor DP (Displaylink)

alternative command

ddccontrol -r 0x60 -w 15 dev:/dev/i2c-7

List the control registers

ddccontrol -d dev:/dev/i2c-6
ddccontrol version 0.6.0
Copyright 2004-2005 Oleg I. Vdovikin (oleg@cs.msu.su)
Copyright 2004-2006 Nicolas Boichat (nicolas@boichat.ch)
This program comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of this program under the terms of the GNU General Public License.

Reading EDID and initializing DDC/CI at bus dev:/dev/i2c-6...
I/O warning : failed to load external entity "/usr/share/ddccontrol-db/monitor/AOC2490.xml"
Document not parsed successfully.

EDID readings:
	Plug and Play ID: AOC2490 [VESA standard monitor]
	Input type: Analog
=============================== WARNING ===============================
There is no support for your monitor in the database, but ddccontrol is
using a basic generic profile. Many controls will not be supported, and
some controls may not work as expected.
Please update ddccontrol-db, or, if you are already using the latest
version, please send the output of the following command to
ddccontrol-users@lists.sourceforge.net:

LANG= LC_ALL= ddccontrol -p -c -d

Thank you.
=============================== WARNING ===============================

Controls (valid/current/max) [Description - Value name]:
Control 0x02: +/1/2 C [New Control Value - No changes]
Control 0x04: +/0/1 C [Restore Factory Defaults]
Control 0x05: +/0/1 C [Restore Brightness and Contrast]
Control 0x08: +/0/1 C [Restore Factory Default Color]
Control 0x10: +/90/100 C [Brightness]
Control 0x12: +/50/100 C [Contrast]
Control 0x14: +/5/13 C [???]
Control 0x16: +/50/100 C [Red maximum level]
Control 0x18: +/50/100 C [Green maximum level]
Control 0x1a: +/50/100 C [Blue maximum level]
Control 0x60: +/772/4 C [Input Source Select (Main)]
Control 0x62: +/17/100 C [Audio Speaker Volume Adjust]
Control 0x6c: +/50/100 C [Red minimum level]
Control 0x6e: +/50/100 C [Green minimum level]
Control 0x70: +/50/100 C [Blue minimum level]
Control 0xac: +/6750/65535   [???]
Control 0xae: +/6000/65535   [???]
Control 0xb2: +/1/8   [???]
Control 0xb6: +/3/8 C [???]
Control 0xc8: +/5/65302 C [???]
Control 0xc9: +/8/65535 C [???]
Control 0xcc: +/4/255   [???]
Control 0xd6: +/1/4 C [DPMS Control - On]
Control 0xdf: +/513/65535 C [???]
Control 0xfe: +/4/255   [???]

Setting volume (reg 0x62) of monitor 2

ddcutil -b 7 setvcp 0x62 0x01

AOC monitor PROBLEM

You can’t switch from an input which is not active!
So my workstation is connected via DP, and i can switch to HDMI.
Now i HAVE TO use the hdmi to switch back to DP.
A solution could be to ssh into the machine connected with HDMI (passwordless login) and switch back to DP.
I made a mqtt button sending a topic that was read by the two machines using the mqtt python program elsewhere on this site.
(Rotary Mqtt Volume control)

gddccontrol

Action LSC Alarm/Siren

Update 20221208 – removed internals

I’ve modded several LSC devices, most of them i could flash with esp-easy or tasmota.
Why mod it? Because it uses the cloud .. i’d like to keep control myself.
Just connect/solder a USB to TTL Converter UART Module like below.
(See other posts)

But this alarm was different, i ended up removing the chip and replace it with a ESP12.

Warning .. loud! .. Yes almost xmas
A WR3 is almost like a ESP-12

So now i had to figure out which GPIO pins and how to control them.

#1/bin/bash
# Flashed ESP Easy on this one
# When i did this, 2019, you needed version 2.1-beta1 
# GPIO 4 controls LED
sleep 10
curl http://10.1.1.251/control?cmd=GPIO,4,1
sleep 1
curl http://10.1.1.251/control?cmd=GPIO,4,0
sleep 1
curl http://10.1.1.251/control?cmd=GPIO,4,1
sleep 2
curl http://10.1.1.251/control?cmd=GPIO,4,0
sleep 5
# Sending rtttl ringtone
curl "http://10.1.1.251/control?cmd=rtttl,5:d=4,o=5,b=112:8a,8a,a,8a,8a,a,8a,8c6,8f.,16g,2a,8a-,8a-,8a-.,16a-,8a-,8a,8a.,16a,8a,8g,8g,8a,g,c6"



alarm sound
 curl "http://10.1.1.251/control?cmd=rtttl,5:d=4,o=5,b=160:2g,2c6,2g,2c6,2g,2c6,2g,2c6"
pager
 curl "http://10.1.1.251/control?cmd=rtttl,5:d=4,o=5,b=160:8d6,16p,2d6,16p,8d6,16p,2d6,16p,8d6,16p,2d6"

Update 20221208 – removed internals

Removed my old hack and replaced it with a Wemos D1.
Added a LED
Next to do .. add a amplifier using a LM356/358

Lidar POC for Vincent

Using Python, Raspberry, a lidar module, a servo, display .. and a 3Dprinted holder.

Proof of concept was to see if it was easy to implement a lidar radar for boat navigation.

#!/usr/bin/env python
import math
import random
import pygame
from pygame.locals import *
import time
import serial
import pigpio

GPIO = 18
ser = serial.Serial("/dev/ttyUSB0", 115200)

pi = pigpio.pi()
distance = 0
pygame.init()
screen = pygame.display.set_mode((480, 320))
while True:
        screen.fill((0,0,0))
        pygame.draw.circle(screen, (0,128,0), (240,320), 100,1)
        pygame.draw.circle(screen, (0,128,0), (240,320), 200,1)
        pygame.draw.circle(screen, (0,128,0), (240,320), 300,1)
        for deze in range(10,170,5):
            count = ser.in_waiting
            if count > 8:
                    recv = ser.read(9)
                    ser.reset_input_buffer()
                    if recv[0] == 'Y' and recv[1] == 'Y': # 0x59 is 'Y'
                        low = int(recv[2].encode('hex'), 16)
                        high = int(recv[3].encode('hex'), 16)
                        global distance
                        distance = low + high * 256
            res = distance
            #print res
            x =  res * math.cos(math.radians(deze))
            y =  res * math.sin(math.radians(deze))
            xreal = x + 240
            yreal = 320 - y
            pygame.draw.line(screen, (0, 255, 0), (240, 320), (xreal, yreal))

            pygame.time.wait(15)
            pygame.display.flip()
            #print(res)
            pi.set_servo_pulsewidth(GPIO, deze * 11 + 500)
            time.sleep(0.2)
        screen.fill((0,0,0))
        pygame.draw.circle(screen, (0,128,0), (240,320), 100,1)
        pygame.draw.circle(screen, (0,128,0), (240,320), 200,1)
        pygame.draw.circle(screen, (0,128,0), (240,320), 300,1)
        for deze in range(170,10,-5):
            count = ser.in_waiting
            if count > 8:
                    #print count
                    recv = ser.read(9)
                    ser.reset_input_buffer()
                    if recv[0] == 'Y' and recv[1] == 'Y': # 0x59 is 'Y'
                        low = int(recv[2].encode('hex'), 16)
                        high = int(recv[3].encode('hex'), 16)
                        global distance
                        distance = low + high * 256
            res = distance
            x =  res * math.cos(math.radians(deze))
            y =  res * math.sin(math.radians(deze))
            xreal = x + 240
            yreal = 320 - y
            pygame.draw.line(screen, (0, 255, 0), (240, 320), (xreal, yreal))
            pygame.time.wait(15)
            pygame.display.flip()
            pi.set_servo_pulsewidth(GPIO, deze * 11 + 500)
            time.sleep(0.2)
#pi.set_servo_pulsewidth(GPIO, 0)

Arpscanner

Changed stuff in my arpscanner

I want to know whats on my network, and be informed when a alien device connects.
This also helps me gathering all devices and macaddresses for a cmdb.

I’ve got below in my crontab

5 * * * * root /usr/local/bin/arpscanner

And the script:

#!/bin/bash
# Using a scanner on a specific vlan/interface
arp-scan -l -g  -I p1p1.10 | grep ^10 | grep -vi packets > /var/log/arpscanner
cat /var/log/arpscanner | awk '{ print $2 }'| while read ; do
grep $REPLY /var/local/arpscanner.lst >/dev/null || echo $REPLY | mail -s arpscanner henri@henriaanstoot.nl
done

New and checked devices i put in the file mentioned above:
/var/local/arpscanner.lst

                00:21:5d:gg:gg:7a       Description
                ac:67:b2:gg:gg:a0       Liligo Twatch
                b8:27:eb:gg:dd:fd       Nieuwe octoprint
                d8:f1:5b:gg:gg:4a       WLAN Dungeon
                48:3f:da:gg:gg:fe       Uboot ESP
                8e:93:79:gg:gg:5d       Tablet Monique
                d8:f1:5b:gg:gg:06       ESP Radar
                dc:a6:32:gg:gg:fb       RPI4
                00:1e:ec:gg:gg:ab       laptop
                68:05:ca:gg:gg:68       storage bak

        etcetera

Machine Learning

Today i started with Coursera’s Machine Learning course.

My friend aloha is doing interesting stuff with ML, but recently i’ve been interested in a work related ML project.

Besides this course i’m following a spotify Podcast called “Machine Learning Guide”, i listen to this on my way to work and back.

I’ve been playing with a lot of code after that. Luckily there are many ebooks about this subject.

  • One of the first was a python program wich used the length of a person and shoesize to determine if it was a man or a woman
  • Another fun one was a program with could determine if a wine was red or white only based by a description
  • There are several graphic based programs i’ve tried. Deepfake, 8mm film enhancers, image classifiers, openface
  • For sound there was voice cloner to test. And audio to text (which i used to transcribe old cassette tapes and VHS tapes.

UPDATE: In 2022 i used what i have learned to enrich my photo metadata.
https://www.henriaanstoot.nl/2022/05/29/photo-manager-addition-using-ml/

Little shared presentation thingy

This little script I made for work.
It allows for a webpage to being shared and updated semi realtime.

We made todo notes using it.

Extract below zip file in a subdirectory in your web accessible server.

https://media.henriaanstoot.nl/edit.tgz

Edit screen, note the little write me file button which is not visible in the movie below.
Example changing text (button press not visible)

It uses a jquery rich text editor javascript library.

CPU / Memory analog meters

Today i used some analog meters to display cpu load and memory usage.

Using below 12 bit DAC (MCP4725 ) and a Wemos Mini

Usage: (Anything you can come up with, if you got a value, you can display it)

curl http://IP/specificArgs?dac_value=$(grep 'cpu ' /proc/stat | awk '{usage=($2+$4)*1000} END {print usage }' |cut -f1 -d.)

Arduino code

#include <ESP8266WiFi.h>            
#include <ESP8266WebServer.h>
#include <Wire.h>
#include <Adafruit_MCP4725.h>
#define MCP4725 0x62   

unsigned int adc;
byte buffer[3];          
Adafruit_MCP4725 dac;

char dac_value_tmp[6] = "0";
int dac_value = 0;
ESP8266WebServer server(80);   //Web server

void setup() {
  Wire.begin();
Serial.begin(115200);
WiFi.begin("accesspoint", "accesspointpass"); 
while (WiFi.status() != WL_CONNECTED) { 
delay(500);
Serial.println("Waiting to connect…");
}
Serial.print("IP address: ");
Serial.println(WiFi.localIP());  //Print IP 
server.on("/genericArgs", handleGenericArgs); 
server.on("/specificArgs", handleSpecificArg);  
server.begin();                        //Start the server
Serial.println("Server listening");   
 dac.begin(0x60); // The I2C Address
}
void loop() {

    uint32_t dac_value;
    int adcValueRead = 0;
    float voltageRead = 0;
server.handleClient();   

}
void handleGenericArgs() { //Handler
String message = "Number of args received:";
message += server.args();     //Get number of parameters
message += "\n";                 

for (int i = 0; i < server.args(); i++) {
message += "Arg nº" + (String)i + " –> "; 
message += server.argName(i) + ": ";    
message += server.arg(i) + "\n";         
} 
server.send(200, "text/plain", message);   
}
void handleSpecificArg() { 
String message = "";
if (server.arg("dac_value")== ""){     //Parameter not found
message = "dac_value Argument not found";
}else{     
message = "dac_value = ";
message += server.arg("dac_value");     //Gets the value of the query parameter
    
int dac_value = server.arg("dac_value").toInt();  
      Serial.print("DAC Value: ");
      Serial.print(dac_value);

 buffer[0] = 0b01000000;   
  buffer[1] = dac_value >> 4;              //Puts the most significant bit values
  buffer[2] = dac_value << 4;              //Puts the Least significant bit values
  Wire.beginTransmission(MCP4725);         //Joins I2C bus with MCP4725 with 0x61 address
  
  Wire.write(buffer[0]);            //Sends control byte 
  Wire.write(buffer[1]);            //Sends the MSB to I2C 
  Wire.write(buffer[2]);            //Sends the LSB to I2C
  Wire.endTransmission();           //Ends the transmission
}
server.send(200, "text/plain", message);          //Returns the HTTP response
}
Little different image MCP4725 .. Analog meter between resistor and white.

Resistor depends on the range of your analog meters

Macro Buttons

A box with macro buttons for your PC using Arduino Leonardo

#include <Keypad.h> // matrix read
#include <Keyboard.h> // keyboard out

#define ENABLE_PULLUPS // fuck the resistors
#define NUMBUTTONS 25 // matrix
#define NUMROWS 5 // matrix rows
#define NUMCOLS 5 // matrix cols

int analog1 = A3;
int analog2 = A7;


int inPinctrl = 3;  // function ctrl, pull to vcc
int inPinalt = 4;  // function alt, pull to vcc 
int valctrl = 0;    // variable to store shifter
int valalt = 0;    // variable to store shifter
int joyx = 0;
int joyy = 0;

//define the symbols per key
char buttons[NUMROWS][NUMCOLS] = {
  {'q','w','e','r','t'},
  {'y','u','i','o','p'},
  {'a','s','d','f','g'},
  {'h','j','k','l','z'},
  {'x','c','v','b','n'},
};
// q-1 (star)      e-zoomin    r-prev t-up
// y-2 u-clearstar             o-open p-down
// a-3 (rate)      d-zoomreset f-full g-left
// h-4 j-clearrate             l-esc  z-right
// x-5 c-slideshow v=zoomout   b-next

//    14 16 10 9  8 
// 21 q  y  a  h  x  
// 20 w  u  s  j  c
// 19 e  i  d  k  v 
// 18 t  p  g  z  n
// 15 r  o  f  l  b 

byte rowPins[NUMROWS] = {16,20,19,18,15}; //connect to the row pinouts of the keypad
byte colPins[NUMCOLS] = {14,7,10,9,8}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad buttbx = Keypad( makeKeymap(buttons), rowPins, colPins, NUMROWS, NUMCOLS); 


void setup() {

  Serial.begin(115200); // debug out baud
  pinMode(inPinctrl, INPUT);    // sets the digital pin 3 as input
  pinMode(inPinalt, INPUT);    // sets the digital pin 4 as input
  digitalWrite(inPinctrl, HIGH);       // turn on pullup resistors
  digitalWrite(inPinalt, HIGH);       // turn on pullup resistors
  Keyboard.begin();        // keyb starter
}



void loop() { // loop the program

  CheckAllButtons(); // check tha buttons

}


void CheckAllButtons(void) {
  joyx = analogRead(analog1);
  joyy = analogRead(analog2);
  Serial.println(joyx);
  Serial.println(joyy);
  if (joyx > 900) { 
      Keyboard.press(KEY_UP_ARROW);
      delay(150);
      Keyboard.releaseAll();
  }
  if (joyx < 200) { 
      Keyboard.press(KEY_DOWN_ARROW);
      delay(150);
      Keyboard.releaseAll();      
  }
  if (joyy > 900) { 
      Keyboard.press(KEY_LEFT_ARROW);
      delay(150);
      Keyboard.releaseAll();
  }
  if (joyy < 200) { 
      Keyboard.press(KEY_RIGHT_ARROW);
      delay(150);
      Keyboard.releaseAll();
  }

  
  char key = buttbx.getKey();

  if (key != NO_KEY)  {
      valctrl = digitalRead(inPinctrl);   // read the function pin
      valalt = digitalRead(inPinalt);   // read the function pin
      Serial.write(valctrl);  // debug
      Serial.println();  // enter
      Serial.write(valalt);  // debug
      Serial.println();  // enter
      Serial.write(key);  // debug
      Serial.println();  // enter
      // button 1 
          if (key == 'q') {
            if (valctrl == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_CTRL); 
            }
            if (valalt == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_ALT); 
            }
           Keyboard.press('1');
           delay(150);
           Keyboard.releaseAll();
          }
      // button 2
          if (key == 'y') {
            if (valctrl == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_CTRL); 
            }
            if (valalt == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_ALT); 
            }
           Keyboard.press('2');
           delay(150);
           Keyboard.releaseAll();
          }
      // button 3
          if (key == 'a') {
            if (valctrl == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_CTRL); 
            }
            if (valalt == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_ALT); 
            }
           Keyboard.press('3');
           delay(150);
           Keyboard.releaseAll();
          }
      // button 4
          if (key == 'h') {
            if (valctrl == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_CTRL); 
            }
            if (valalt == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_ALT); 
            }
           Keyboard.press('4');
           delay(150);
           Keyboard.releaseAll();
          }
      // button 5
          if (key == 'x') {
            if (valctrl == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_CTRL); 
            }
            if (valalt == 0) { // function shifter active?
               Keyboard.press(KEY_LEFT_ALT); 
            }
           Keyboard.press('5');
           delay(150);
           Keyboard.releaseAll();
          }
      // button i - clear rate
          if (key == 'i') {
           Keyboard.press(KEY_LEFT_CTRL); 
           Keyboard.press('0');
           delay(150);
           Keyboard.releaseAll();
          }
      // button k - clear label
          if (key == 'k') {
           Keyboard.press(KEY_LEFT_ALT); 
           Keyboard.press('0');
           delay(150);
           Keyboard.releaseAll();
          }
      // button v - slideshow
          if (key == 'v') {
           Keyboard.press(KEY_ESC); 
           Keyboard.press(KEY_LEFT_CTRL); 
           Keyboard.press('s');
           delay(150);
           Keyboard.releaseAll();
          }
      // button t - zoomin
          if (key == 't') {
           Keyboard.press('+'); 
           delay(150);
           Keyboard.releaseAll();
          }
      // button g - zoomreset
          if (key == 'g') {
           Keyboard.press('*');
           delay(150);
           Keyboard.releaseAll();
          }
      // button n - zoomout
          if (key == 'n') {
           Keyboard.press('-'); 
           delay(150);
           Keyboard.releaseAll();
          }
//r  o  f  l  b
      // button r - prev
          if (key == 'r') {
           Keyboard.press(KEY_LEFT_CTRL); 
           Keyboard.press(KEY_LEFT_ARROW); 
           delay(150);
           Keyboard.releaseAll();
          }
           
      // button o - open
          if (key == 'o') {
           Keyboard.press(KEY_RETURN); 
           delay(150);
           Keyboard.releaseAll();
          }
           
      // button f - full
          if (key == 'f') {
           Keyboard.press('f'); 
           delay(150);
           Keyboard.releaseAll();
          }
           
      // button l - esc
          if (key == 'l') {
           Keyboard.press(KEY_ESC); 
           delay(150);
           Keyboard.releaseAll();
          }
           
      // button b - next
          if (key == 'b') {
           Keyboard.press(KEY_LEFT_CTRL); 
           Keyboard.press(KEY_RIGHT_ARROW); 
           delay(150);
           Keyboard.releaseAll();
          }
           





          
  }
}

Pressure Lab

For measuring pressure in fermentation containers, I designed a pressure sensor which could be wireless connected to a fermentation container.
The sensor would transmit the values to a Raspberry which was configured as a Access Point and would store the measurements and generated graphs using Grafana.

Raspberry with RealtimeClock
RTC on raspberry

3D printed holder, designed in blender. Holds battery prints and has little handle to lift from container

Nodes config:

Esp configuration, connect with micro-usb
Flashing with linux

esptool.py -p /dev/ttyUSB0  write_flash 0x00000  ESP_Easy_mega-20190311_normal_ESP8266_4M.bin

Make a connection with the ESP Access point

Connect esp with a power source.
Look for a AP with ESP_Easy_0

Use password “configesp” to connect

Start you browser and enter http://192.168.4.1

In wifi wizard setup select “pressurespot”
Enter password “pressurespot”

Press connect

Wait 20s and look in the raspberry logs which IP the ESP got.

Connect laptop/mobile to wifi “pressurespot”and connect

Enter found IP from ESP in your browser.

Proceed to main config

Main setting table, set the following

  • Unit name & number + append
  • SSID and WPA key pressurespot
  • Client IP block level allow all
  • Press submit

Press controller tab

Press first edit button and set following
– Protocol: domoticz http
Next set
– Controller IP : 10.42.0.1
– Toggle enabled and press submit

Resulting in:

Next we got to Hardware

I2C interface switch GPIO-4 and GPIO-5

  • GPIO – SDA: GPIO-4 (D2) change to GPIO-5 (D1)
  • GPIO – SCL: GPIO-5 (D1) change to GPIO-4 (D2)
  • Press “Submit”

Devices TAB

Press edit, and select device “Environment – BMx280” from the pulldown menu.

Next, set the following

  • Name: pressure
  • Enable on
  • I2C address : 0x76 ( Is there is no 0x76 of 0x77 .. do a i2c scan on the next tab )
  • Send to controller , mark this
  • IDX: give this the number you had given this node (this is the one you have to use in domoticz )
  • interval 10Seconds
  • and press submit

In the Devices tab, you should be able to see the sensor with the values (Temperature and pressure)

No values? Do a i2c scan and/or reboot ESP ( You can find these in the tools tab)

Tools TAB

Press I2C scan, when seeing a address like 0x76 or 0x77 use this in previous tabs.
Still nothing, even after reboot? Maybe faulty hardware?

Everything okay? Back to the config tab

We are going to set the sleep mode.
Warning ! .. when setting this it is hard to get into the config pages again.
ESP will startup, connect to wifi, send values and goes to sleep again.

At the bottom set: Sleep awake time 1 sec

Buttons on the raspberry / pressurespot

Red button :

  • Less than 3 seconds is reboot
  • Longer than 3 seconds is shut down
    • Charger can be removed, when the green light is off

Led lights on the sensors

  • Red light (R2; constant): battery is charging
  • Blue light (R1; constant): battery is full
  • Blue light (R1; constant) & red light (R2; blinking): trying to charge, but no battery connected

Add shutdown script to /etc/rc.local

python /usr/local/bin/power-switch.py &amp;

/usr/local/bin/power-switch.py

#!/usr/bin/python
import threading, subprocess
import RPi.GPIO as GPIO
def shutdown():
    subprocess.call('sudo shutdown -h now', shell=True)
def edge_detected(pin):
    if GPIO.input(pin):
        t.cancel()
        subprocess.call('sudo reboot', shell=True)
    else:
        t.start()
if __name__ == '__main__':
    try:
        GPIO.setmode(GPIO.BOARD)
        GPIO.setup(5, GPIO.IN)
        GPIO.add_event_detect(5, GPIO.BOTH, callback=edge_detected, bouncetime=10)
        t = threading.Timer(3.0, shutdown)
        while True:
            pass
    finally:
        GPIO.cleanup()

/usr/local/bin/ledoff.py

#!/usr/bin/python
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18,GPIO.OUT)
GPIO.output(18,GPIO.LOW)

/usr/local/bin/ledon.py

#!/usr/bin/python
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18,GPIO.OUT)
GPIO.output(18,GPIO.HIGH)

nmcli device wifi hotspot ssid pressurespot password pressurespot

 /etc/NetworkManager/system-connections/Hotspot-1

[connection]
id=Hotspot-1
uuid=c2c05528-63f9-44c7-93ce-264187a45086
type=wifi
permissions=
timestamp=1553708934

[wifi]
hidden=true
mac-address=B8:27:EB:7F:D5:E7
mac-address-blacklist=
mode=ap
seen-bssids=B8:27:EB:7F:D5:E7;
ssid=pressurespot

[wifi-security]
group=ccmp;
key-mgmt=wpa-psk
pairwise=ccmp;
proto=rsn;
psk=pressurespot

[ipv4]
dns-search=
method=shared

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=ignore

/usr/bin/servicecheck.sh (in rc.local and crontab root user – every minute

#!/bin/bash
nmcli connection show  | grep "Hotspot-1           c2c05528-63f9-44c7-93ce-264187a45086  802-11-wireless  wlan0" &gt;/dev/null &amp;&amp; touch /tmp/wlan || rm -f /tmp/wlan
for f in influx domoticz telegraf grafana mosquitto ; do
pgrep $f &gt;/dev/null &amp;&amp; touch /tmp/$f || rm -f /tmp/$f
done
count=$(ls  /tmp/influx /tmp/domoticz /tmp/telegraf /tmp/grafana /tmp/mosquitto /tmp/wlan | wc -l)
if [ $count -eq 6 ]  ; then
/usr/local/bin/ledon.py
exit 0
fi

for timer in {1..10} ; do
/usr/local/bin/ledon.py
sleep 1

/usr/local/bin/ledoff.py
sleep 1
done

Rest services to be installed on Raspberry

At the moment the raspberry uses domoticz between the Mqtt broker (Mosquitto) and the database (Influx)
Data wil be displayed using grafana.

tail -f /var/log/syslog shows which ip to which ESP
DHCPACK(wlan0) 10.42.0.104 cc:50:e3:c4:96:61 lab-
DHCPACK(wlan0) 10.42.0.181 cc:50:e3:c4:8d:73 lab-4
DHCPACK(wlan0) 10.42.0.186 cc:50:e3:c4:9b:ef lab-1

Configuring the raspberry

Install influx and grafana

First we add Influx repositories to apt:

wget -qO- https://repos.influxdata.com/influxdb.key | sudo apt-key add -
source /etc/os-release
echo "deb https://repos.influxdata.com/debian $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/influxdb.list

Update apt with the new repo & install.

sudo apt update && sudo apt install -y influxdb

Then start the influxdb service and set it to run at boot:

sudo systemctl enable influxdb --now

Again we need to add the Grafana packages to apt:

wget -q -O - https://packages.grafana.com/gpg.key | sudo apt-key add -
echo "deb https://packages.grafana.com/oss/deb stable main" | sudo tee /etc/apt/sources.list.d/grafana.list

We can now update and install the binaries:

sudo apt update && sudo apt install -y grafana

Then simply enable the service and set to run at boot:

sudo systemctl enable grafana-server.service --now

Now we can check that grafana is up by loading it in a browser: http://10.42.0.1:3000. If so, you can log in with the username and password = admin and set a new admin password.

Install mosquitto

sudo apt install mosquitto mosquitto-clients

Install domoticz using below command

<code><strong>curl -sSL install.domoticz.com | sudo bash</strong></code>

Under hardware add MQTT server adress 127.0.0.1

Add virtual sensors to domoticz.

Click hardware and create virtual sensor, lab with sensornumber. Sensor type is Temp+Baro.

When looking at devices you will see the virtual devices.

Here you can see if data is coming from the ESP’s

Pushing the data into Influxdb:

Goto settings > more options > data push > influxdb

Add temperature

  • Device name: lab* (lab plus unit number)
  • Value to send: temperature
  • Target type: direct (NOTE screenshot below is wrong)
  • press add

Add barometer

  • Device name: lab* (lab plus unit number)
  • Value to send: Barometer
  • Target type: direct (NOTE screenshot below is wrong)
  • press add

Configure Grafana

Go with your browser to http://10.42.0.1 when connected to the rpi access point

Goto settings and data sources, add influxdb with source http://localhost:8086
Goto dashboard and create a new one.

Data source is influx, select A Barometer
And the IDX that was used in configuring the ESP
Axes: Units in millibars, above example had temperature, for both Baro and Temp in one graph.
Select null value as connected

TODO

Telegraf/mosquito
Services in domoticz
Rpi status display
Sensor test / monitor