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demo script and readme

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2024-09-25 01:50:33 +02:00
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GPIO-examples.md
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@@ -3,9 +3,14 @@ This guide assumes you have a correctly installed and set up board, with the cor
*Caveat:* notes here are biased towards Python usage, since that is what I will be using in my projects.
## Common
```
$ sudo apt install gpiod
```
## General Purpose GPIO (digital read/write)
**You do not need to use a custom Device Tree in order to use digital IO**
* The 'default' device tree for the MQ pro has 26 free pins to use!
* The 'default' device tree for the MQ pro has 26 free pins to use!
Look at the great guide here: https://worldbeyondlinux.be/posts/gpio-on-the-mango-pi/
@@ -106,13 +111,13 @@ You can see that interface `0` has a BME280 device at address`0x76`, and a SSD13
# Python demo
The following is a demo of using I2C to read data from a BME280 Temperature, Humidity and Pressure sensor, and display ito on a SSD1306 OLED display.
- It will be expanded with lgpio PWM and pin input/interrupt code later.
- All the install steps here (both `apt` and `pip`) are tediously slow on the MQ Pro.
- All the install steps here (making the venv, `apt` and `pip`) are tediously slow on the MQ Pro.
For the demo we need to install some dependencies via `apt`.
* I am using a [virtual environment](https://docs.python.org/3/tutorial/venv.html), rather than installing the python libraries globally.
```bash
# Dependencies needed by pip install.
$ sudo apt install python3-venv python3-dev python3-lgpio libjpeg-dev liblgpio-dev build-essential
$ sudo apt install python3-venv python3-dev libjpeg-dev liblgpio-dev swig build-essential
# Create virtualenv at './env' and activate it
# - exit with `deactivate`
@@ -124,12 +129,14 @@ $ source env/bin/activate
(env) $ pip install --upgrade pip
(env) $ pip install --upgrade pimoroni-bme280
(env) $ pip install --upgrade luma.oled
# Not yet used in demo: (env) $ pip install --upgrade lgpio
# Run the demo
(env) $ python GPIO-demo.py
```
....WIP...
I still need to upload he demo script..
#### Work In Progress ####
Demo runs but still needs expanding to demo lgpio and pwm control
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