I don’t like cloud enabled devices, except if it is my own cloud!
I bought a Hikvision doorcam, when i researched the diverse doorcams where was a hikvision which could use a existing doorchime.
When i got mine in, it did not have this feature. Damn what to do!
Where where several solutions i could think off:
Use as is .. a no-go for me
Offload SSL on a proxy and try to reverse engineer the https communication
Or a hardware solution
I looked at the electronics and tried to find out how things where connected and where things where you could make use of. I soldered some wires to a little print where the pushbutton was located. Now i could read the button press, video was easily captured by using a RTSP port.
For my home automation i’m using Home Assistant and Domoticz. All 433Mhz Temperature/Humidity are connected to a RFXcom device on two domoticx instances. (Master slave construction)
I’ve made a php script and a bash script to draw all sensors on a floorplan in realtime.
There is also a cron running which takes a snapshot of the generated image every 5 minutes. These images are being converted to MP4 and animated GIF to have a timelapse with all temperatures displayed on a floorplan.
An obfuscated view of the floorplan
The circles are where sensors are placed. Colors are from blue till red, representing the heat. In the center is the measured temperature value.
The (shortened) PHP script: (index.php)
<?php
header('Content-type: image/png');
// This is the floorplan empty ..
$png_image = imagecreatefrompng('plattegrondenmerge.png');
$white = ImageColorAllocate($png_image, 0, 0, 0);
$max = 40;
$min = -10;
// living
// getstate is a bash script (see below which gets the values from domoticz using curl)
// 840 is the domoticz idx
$temp840 = shell_exec('./getstate 840');
// A gray circle will be drawn if the temperature age is > 500 seconds
$age = shell_exec('./new.sh 18 840 500 >/dev/null || echo gray');
// location of circle
$start_x = 950;
$start_y = 760;
$line = $temp840 + 10;
// get x-th line from colors
$colorfromlist = shell_exec("tail --lines=$line ./colors2 | head -1");
if(strpos($age, "gray") !== false){
$colorfromlist = "128,128,128";
};
$colors = explode(",", $colorfromlist);
$color = imagecolorallocatealpha($png_image, $colors[0], $colors[1], $colors[2], 50);
// draw circle
imagefilledellipse ($png_image, $start_x, $start_y, 175, 175, $color);
$start_x = $start_x - 70;
$start_y = $start_y + 15;
// add text
imagettftext($png_image, 24, 0, $start_x, $start_y, $white, './verdana.ttf', $temp840);
// winecellar
$temp840 = shell_exec('./getstate 839');
$age = shell_exec('./new.sh 18 839 700 >/dev/null || echo gray');
$start_x = 560;
$start_y = 840;
$line = $temp840 + 10;
$colorfromlist = shell_exec("tail --lines=$line ./colors2 | head -1");
if(strpos($age, "gray") !== false){
$colorfromlist = "128,128,128";
};
$colors = explode(",", $colorfromlist);
$color = imagecolorallocatealpha($png_image, $colors[0], $colors[1], $colors[2], 50);
imagefilledellipse ($png_image, $start_x, $start_y, 175, 175, $color);
$start_x = $start_x - 70;
$start_y = $start_y + 15;
imagettftext($png_image, 24, 0, $start_x, $start_y, $white, './verdana.ttf', $temp840);
// ETC ETC
imagesavealpha($png_image, TRUE);
imagepng($png_image);
imagedestroy($png_image);
?>
getstate bash script (gets the temperature from domoticz instance1 given an idx)
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 xmasA 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
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.
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 &
/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)
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.
A friend of mine wanted to monitor his UPS using domoticz. This UPS only had a simple web interface with information.
So we needed to scrape this information and push this into domoticz.
First create a dummy device in domoticz and note its IDX.
Then we can scrape needed information using below script.
#!/bin/bash
#set -x
# Domoticz server
SERVER="127.0.0.1:8080"
# APC Back-UPS HS 500 status URL
UPS="http://IP-OF-UPS/status.cgi"
# The number of the IDX in the list of peripherals
IDX="362"
# Path for temporary file (RAM drive)
TMPFILE="/tmp/apc-hs500-status.txt"
# Get APC Back-UPS HS 500 status and write to temporary file
wget $UPS -O $TMPFILE 2>/dev/null
if [ $? = 0 ]
then
PWR=$(cat $TMPFILE| tr -dc '[[:print:]]' |awk -F"Watts" '{print $1}' |rev |cut -f1 -d\> |rev |cut -f1 -d\&)
fi
if [ $PWR ]
then
echo "Load on Battery in Watts: $PWR"
# Send data to Domoticz
curl -s -i -H "Accept: application/json" "http://$SERVER/json.htm?type=command¶m=udevice&idx=$IDX&nvalue=0&svalue=$PWR"
PWR=""
fi
rm $TMPFILE
"If something is worth doing, it's worth overdoing."
