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Merge pull request #1 from dbduino-prjs/develop
RPI Basic GPIO Python
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‎.gitignore

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js/node_modules/
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credentials.py
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*.pyc
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package*.json
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node-red/docker/data/node_modules/
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.npm
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.config*
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.flows*
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*.tgz
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*.tar.gz

‎arduino-cloud/rpi-gpio-basic-dashboard.yaml

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name: Raspberry-Pi Basic GPIOs
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widgets:
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- height: 8
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height_mobile: 9
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name: Value evolution
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type: Chart
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variables:
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- thing_id: Raspberry-Basic-GPIO
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variable_id: test_value
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width: 10
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width_mobile: 10
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x: 4
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x_mobile: 0
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"y": 0
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y_mobile: 4
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- height: 4
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height_mobile: 4
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name: Push Button
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type: Push Button
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variables:
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- thing_id: Raspberry-Basic-GPIO
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variable_id: button
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width: 4
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width_mobile: 4
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x: 18
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x_mobile: 0
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"y": 0
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y_mobile: 13
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- height: 4
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height_mobile: 4
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name: Button
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options:
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mode: True / False
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type: Status
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variables:
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- thing_id: Raspberry-Basic-GPIO
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variable_id: button
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width: 4
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width_mobile: 4
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x: 18
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x_mobile: 0
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"y": 4
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y_mobile: 17
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- height: 4
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height_mobile: 4
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name: LED
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options:
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mode: Both Colors
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type: LED
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variables:
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- thing_id: Raspberry-Basic-GPIO
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variable_id: led
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width: 4
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width_mobile: 4
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x: 0
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x_mobile: 4
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"y": 4
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y_mobile: 13
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- height: 4
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height_mobile: 4
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name: LED
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options:
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showLabels: true
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type: Switch
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variables:
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- thing_id: Raspberry-Basic-GPIO
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variable_id: led
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width: 4
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width_mobile: 4
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x: 0
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x_mobile: 0
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"y": 0
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y_mobile: 0
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- height: 4
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height_mobile: 4
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name: Value
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type: Value
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variables:
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- thing_id: Raspberry-Basic-GPIO
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variable_id: test_value
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width: 4
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width_mobile: 4
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x: 14
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x_mobile: 4
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"y": 4
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y_mobile: 0
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‎assets/RPI-GPIO-Basic-Dashboard.png

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‎assets/RPI-GPIO-Basic-Diagram.png

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‎assets/RPI-GPIO-Basic-Thing_Variables.png

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‎assets/RPI-GPIO-Basic-Thing_Variables2.png

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‎js/gpio-basic/README.md

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sudo apt install gpiod libgpiod2 libgpiod-dev libnode-dev
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npm install --save node-libgpiod node-fetch
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Make sure that all the variables are global (chip, ledLine, buttonLine, ...). Otherwise, any timed operation will not work properly.

‎js/gpio-basic/gpio-basic.js

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const gpiod = require('node-libgpiod');
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const { ArduinoIoTCloud } = require('arduino-iot-js');
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const LED = 14; // GPIO14, Pin 8
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const BUTTON = 15; // GPIO15, Pin 10
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const DEVICE_ID = "09d3a634-e1ad-4927-9da0-dde663f8e5c6";
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const SECRET_KEY = "IXD3U1S37QPJOJXLZMP5";
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// Make sure these variables are global. Otherwise, they will not
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// work properly inside the timers
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chip = new gpiod.Chip('gpiochip4');
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ledLine = chip.getLine(LED);
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buttonLine = chip.getLine(BUTTON);
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ledLine.requestOutputMode("gpio-basic");
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// To configure the pull-up bias, use 32 instead of gpiod.LineFlags.GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_UP if it is undefined
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buttonLine.requestInputModeFlags("gpio-basic", gpiod.LineFlags.GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_UP);
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let client;
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// This function is executed every 1.0 seconds, polls the value
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// of the button and sends the data to Arduino Cloud
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function readButton(client) {
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let button = buttonLine.getValue() ? true : false;
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if (client)
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client.sendProperty("button", button);
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console.log("pollButton:", button);
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}
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// This function is executed every 10.0 seconds, gets a random
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// number between 0 and 100 and sends the data to Arduino Cloud
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function readValue(client) {
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let value = Math.floor(Math.random() * 101);
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if (client)
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client.sendProperty("test_value", value);
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console.log("pollValue", value);
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}
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// This function is executed each time the "led" variable changes
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function onLedChanged(led) {
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ledLine.setValue(led ? 1 : 0);
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console.log("LED change! Status is: ", led);
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}
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// Create Arduino Cloud connection
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(async () => {
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try {
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client = await ArduinoIoTCloud.connect({
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deviceId: DEVICE_ID,
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secretKey: SECRET_KEY,
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onDisconnect: (message) => console.error(message),
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});
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client.onPropertyValue("led", (led) => onLedChanged(led));
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}
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catch(e) {
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console.error("ArduinoIoTCloud connect ERROR", e);
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}
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})();
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// Poll Value every 10 seconds
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const pollValue = setInterval(() => {
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readValue(client);
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}, 10000);
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// Poll Button every 1 seconds
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const pollButton = setInterval(() => {
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readButton(client);
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}, 1000);

‎node-red/README.md

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## The setup
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## GPIOD nodes
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In all the projects in this repository, we are using `libgpiod` and the different wrappers and bindings for the variuos programming languages to interact with the RPI GPIOs. There are many other projects and libraries that can be used, but this is the most portable one across all the Raspberry Pi flavours and it can also be extrapolated to any Linux-based machine.
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In this project, we are going to use `node-red-contrib-libgpiod` which is the
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Go to the menu "Manage Palette" --> "Install". Search the following nodes and install them.
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@arduino/node-red-contrib-arduino-iot-cloud
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node-red-contrib-libgpiod
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## Configure the access to Arduino Cloud
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## How to install Node-RED
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There are many ways to install Node-RED in a Raspberry Pi or any other machine. Typically, you can use: docker, snap, apt, native node.js installation.
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The tricky point is that we want our Node-RED instance to have access to the GPIOs and host system. This can be achieved with all the installation methods but for most of them it is quite difficult to achieve and many conflicts and issues need to be solved. So, the easiest and recommended way would be to do a native installation using NPM.
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These are the instructions
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1. Installation
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```
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sudo npm install -g --unsafe-perm node-red
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```
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2. Manage the service
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I recommend using pm2 to manage the service and make it start on boot
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```
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sudo npm install -g pm2
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pm2 start /usr/bin/node-red -- -v
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pm2 save
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sudo env PATH=$PATH:/usr/bin $(which pm2) startup systemd
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```
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