Tag Archives: raspberry

Computer, IOT / Domoticz

Dual PICO UART test with CirquitPython

Leave a comment

Test for UART serial communication for my whack-a-mole game

CODE for Client

import board
import busio
import time

uart = busio.UART(
    tx=board.GP16,
    rx=board.GP17,
    baudrate=115200,
    timeout=1,
)

time.sleep(2)

commands = ["PING", "HELLO", "TEST"]
while True:
    for cmd in commands:
        print("Sending:", cmd)
        uart.write((cmd + "\n").encode())

        response = uart.readline()

        if response:
            print("Response:", response.decode().strip())
        else:
            print("No response")

        time.sleep(1)

CODE for server

import board
import busio
import digitalio
import time

# UART pins
uart = busio.UART(
    tx=board.GP0,
    rx=board.GP1,
    baudrate=115200,
    timeout=0.1
)

# Onboard LED
led = digitalio.DigitalInOut(board.LED)
led.direction = digitalio.Direction.OUTPUT

print("UART LED server ready")

while True:
    data = uart.readline()

    if data:
        command = data.decode("utf-8").strip()
        print("Received:", command)

        if command == "PING":
            # Blink LED
            led.value = True
            time.sleep(0.2)
            led.value = False

            # Reply
            uart.write(b"PONG\n")

        else:
            uart.write(b"UNKNOWN\n")

    time.sleep(0.01)
Computer

Whack-a-mole progress

Leave a comment

A while back I started modifying Arcade buttons.

UPDATE 20260706

Fireworks LED addition and modifying Arcade buttons

Now, I’ve made a board with 16 modified buttons and some micropython code.

White = mole, green = hit in time, red = wrong button/out of time, rainbow = bonus points.

Now i have to think of a display and select buttons, to select the game mode and see the score.

Schematic

Above is a simplified schematic. See notes below.

  • Led rings are 8 not in example 12 (didn’t have that part in fritzing)
  • Led rings have 5V, GND, DI (data in) and DO (data out)
  • Led rings are connected in series, python code divides by 8
  • GPIO for buttons (16 yellow) have internal PICO pullup resistors
  • Todo: Screen and mode select
  • Game modes : Currently I can think of four.
  • 1 Player mode – with bonus button – works kindda
  • 2 Player mode – Green player 1 and Blue player 2 – need testing
  • 2 Player mode (half playfield) … todo
  • Above with mixed random colors, press only GREEN (or blue) .. todo
  • 1 Player mode – all random colors + bonus .. todo
  • 1 Player mode – with bonus button – keep bonus pressed for 5 seconds to double, so you need to single hand press others. (Missing is reset bonus?!?) … todo
  • Button keeps lit until pressed .. do 10 in a row. Print fastest and average time… todo

Speedup ?

Scoreboard – using a HUB75 (previous project here)

64×64 Matrixrgb plus Conway’s Game of Life

SCOREBOARD this will be connected using UART to the whack-a-mole Raspberry Pico

Scoreboard

Some game mode examples

Computer, IOT / Domoticz

Raspberry Pi 5 Projects

Leave a comment

Again … out of SBCs
Where are all these things in my home. Someone is stealing Raspberry Pi’s, ESP32 and other sensors.
(Probably me)

So I’ve got multiple projects running on one RPi.

  • Dual Camera’s on top (brown ribbons), these are for VR streaming project.
  • Dual Camera’s on top. these are for a Red Light Green Light game. (Using motion detection on both camera’s for two players.
  • Below a INMP441 Mems microhone. This is a test for BirdNet recording.

All of the above are partially working. Code follows.

INMP441 is a tricky thing. I needed to do some bitbanging to get it working.

Loads of INMP441 info will be posted

Computer, IOT / Domoticz

Home Assistant Voice and OpenMqttGateway

Leave a comment

Yesterday I got my Home Assistant Voice!

This is a Non-Cloud solution like Alexa and Google devices.
I only could play with it for a few minutes because I was working on Arduino code with an ILI9341 Display and a BME280 (Temperature/Humidity/Air pressure).

Today I got some new goodies in, one of these is a LilyGO LoRa display which works on 433 Mhz.

I flashed OpenMQTTGateway on this device.

In the past, I posted about the RFCOM Gateway using Domoticz.
This runs on a Raspberry Pi.
While looking for alternatives, I found a rtl-sdr solution.

https://github.com/merbanan/rtl_433

Using this:

But I liked the ESP32 solution more.
Now I can dismantle Domoticz, which served me well for many years.

How cool to see realtime updates!

Note: This is a receiver device only!
But I only use read-only sensors like : Door/window, doorbell, temperature/humidity and Firesensors.

These are automatically detected in Home Assistant.

No more RFXCOM with a Raspberry.

Computer

Started working on C64Pico with Bigred

Leave a comment

A week ago I got the last components delivered to my doorstep.

This project was made by Silvervest and it’s f*ckin awesome.

https://github.com/silvervest/c64pico

I was afraid to start this myself, SMD is on another level for me.
But my good friend Marco said … No problem!

So I ordered components online, which was not easy.
Selecting the correct parts, sizes and options.

Finding orientations of the components
The master at work, he has always been our soldering master (see GPC)
Using a microscope
Flux
Wick
I have to do one myself

These things are really really small

1.6mm x 0.8mm
40 connections / 20mm !

Using tweezers to place the components was even difficult.
The slippery tiny bastard got catapulted everywhere. (Or got stuck on fingers, soldering iron and alike)
Many small components got lost into the 7th dimension. Never to be found again.

Awesome to work on this together, but Marco said that I have to try it myself.
Welllll, I got 3/4 of the ATmega328PB-A perfectly soldered, then I notished that it was crooked.
Desoldering was a mess, and I heated the PCB TOO much with the heatgun.

My messed-up PCB, and f*cked-up IC. Leave it to the professionals.

Next step for me is soldering the 75 mini buttons!

Got a Trinitron display from him, I was looking for this for a long time.

Computer, IOT / Domoticz

What to do when waiting for your ribs on the smoker. (Programming some python)

Leave a comment
Use a little spoon NOT a knife
Get your fingers underneath the membrane
Preparing the ribs, getting the membrane off.

This time I used a rub with the following ingredients:
Seasalt, garlic, brown sugar, mustard seeds, paprica, cilantroseeds, black pepper, red pepper, oregano, thyme and cumin.

Doing a simple 3-2-1 smoke session, so .. what to do in dose 6 hours?

Lets make something using a Sense hat and Python.
Same HAT I used for my xmas ornament thingy in our tree.

  • Generate a large maze (80×80 for now)
  • Paint the maze using colors on the SenseHat
  • Read joystick movement and scroll the maze accordingly, keeping the player in the middle

Now I have to paint my ribs with BBQ sauce, and leave it in the smoker for yet another hour. (Nice glazing)

Next steps for the maze:

Use a better way to generate (reverse backtracking as I made for my other maze thing)

(Blind) Maze puzzle now with generation and play modes.

Wall collision detection is nearly completed.

Better placement “birth” of player in the maze.

# # # # # # # # # # # # # # # # # # # # 

# R D . . . . . R D . . . . R R D R D # 

# D L . . . . . U D . . . . U . R U D # 

# D . . . . R R U R D . . R U U L . D # 

# R D . . . U . . . R R D U . . U L D # 

# . R D R R U . . . . . D U . . . U L # 

# . . D U L . . . . . D L U . . . . . # 

# . . R R U . . . . . R R U . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# . . . . . . . . . . . . . . . . . . # 

# # # # # # # # # # # # # # # # # # # #
Computer, IOT / Domoticz

New part demo (st7789 with micropython)

Leave a comment

(And some WIP)

A little starfield demo

followup on : https://www.henriaanstoot.nl/2024/01/26/raspberry-pico-with-st7789v2-display-3d-control/

Some other stuff

Nice little case for the presence-detector
New idea for monitoring my smoker

See links below

HLK-LD2410B with a Wemos Mini D1 (v4) connected to Home Assistant using ESPHome

The smoking monitoring thingy is a new version of my (never posted) BBQ watch.

Computer

Raspberry Pico with st7789v2 display 3D control

Leave a comment

While ordering components for a mini C64 project I’m doing with my friend Bigred, I ordered a cheap ST7789-v2 display.

I want to make a generic pico gadget with a display, buttons and sound.
This to make a mini device for writing micropython demos.

The 3 tactical buttons are controlling the X,Y and Z axis of the rotating Cube.

Pinout:

PICODISPLAY
GP2Tactical switch (other side to 3v3)
GP3Tactical switch (other side to 3v3)
GP4Tactical switch (other side to 3v3)
GP9CS1
GNDGND
3v3VCC
GP18SCL (SPI clock)
GP19SDA (MOSI / SPI Data)
GP20RES (reset)
GP17DC (data command)
GP16BLK (backlight)

I know it says SCL/SDA (i2c) but it’s SPI controlled.

Used library : https://github.com/russhughes/st7789_mpy/tree/master

Some 3D explanation I drew a long time ago.

Using python you can use the Math funtions. (sin/cos)
Note: these are in radians!
print(math.sin(math.radians(30))) # 30 degrees

When using MachineCode you can use lookup tables.
These are generated tables which hold precalculated sin data for every degree.
You don’t have to use both cos and sin! (these are just 90 degrees shifted!)

Erik and I used a little basic program to generate an ASM include file like this

Costab LABEL BYTE
DB 0B4h,0B4h,0B4h,0B4h,0B4h,0B3h,0B3h,0B3h,0B2h,0B2h,0B1h,0B1h,0B0h,0AFh,0AFh
DB 0AEh
DB 0ADh,0ACh,0ABh,0AAh,0A9h,0A8h,0A7h,0A6h,0A5h,0A4h,0A2h,0A1h,0A0h,9Eh,9Dh,9Bh
DB 9Ah,98h,96h,95h,93h,91h,90h,8Eh,8Ch,8Ah,88h,86h,84h,82h,80h,7Eh
DB 7Ch,7Ah,78h,76h,74h,72h,70h,6Eh,6Ch,69h,67h,65h,63h,61h,5Eh,5Ch
DB 5Ah,58h,56h,53h,51h,4Fh,4Dh,4Bh,48h,46h,44h,42h,40h,3Eh,3Ch,3Ah
DB 38h,36h,34h,32h,30h,2Eh,2Ch,2Ah,28h,26h,24h,23h,21h,1Fh,1Eh,1Ch
DB 1Ah,19h,17h,16h,14h,13h,12h,10h,0Fh,0Eh,0Dh,0Ch,0Bh,0Ah,09h,08h
DB 07h,06h,05h,05h,04h,03h,03h,02h,02h,01h,01h,01h,00h,00h,00h,00h
DB 00h,00h,00h,00h,00h,01h,01h,01h,02h,02h,03h,03h,04h,05h,05h,06h
DB 07h,08h,09h,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh,10h,12h,13h,14h,16h,17h,19h
DB 1Ah,1Ch,1Eh,1Fh,21h,23h,24h,26h,28h,2Ah,2Ch,2Eh,30h,32h,34h,36h
DB 38h,3Ah,3Ch,3Eh,40h,42h,44h,46h,48h,4Bh,4Dh,4Fh,51h,53h,56h,58h
DB 5Ah,5Ch,5Eh,61h,63h,65h,67h,69h,6Ch,6Eh,70h,72h,74h,76h,78h,7Ah
DB 7Ch,7Eh,80h,82h,84h,86h,88h,8Ah,8Ch,8Eh,90h,91h,93h,95h,96h,98h
DB 9Ah,9Bh,9Dh,9Eh,0A0h,0A1h,0A2h,0A4h,0A5h,0A6h,0A7h,0A8h,0A9h,0AAh,0ABh,0ACh
DB 0ADh,0AEh,0AFh,0AFh,0B0h,0B1h,0B1h,0B2h,0B2h,0B3h,0B3h,0B3h,0B4h,0B4h,0B4h
CosTabE LABEL BYTE


Basic:
0 DEF SEG = &H7000: c = 0
1 pi = 3.14159265#
2 FOR x = 0 TO 2 * pi STEP 2 * pi / 256
3 d = COS(x) * 127 + 127
4 POKE c, d: c = c + 1: NEXT

Most i learned from a book called “Art of Graphics”
(This is image of the book from the internet, i don’t think I still got my copy somewhere.