11. Networking¶

Week assignment¶

Group assignment:
- Send a message between two projects
- Document your work to the group work page and reflect on your individual page what you learned
Individual assignment:
- design, build and connect wired or wireless node(s) with network or bus addresses and a local input and/or output devices

Link to goup assignment page for Networking week

Research¶

Research i did this week was not so much i check out the I2C bus and how to program simple I2c Bus so i could let Master run the slave. I decided to Use Xiao ESP32C3 as master and Xiao RP-2040 as slave, both circut have one led light and a button that turn on and off the led. then i wantet the master to take over the slave so i could control the led on the slave circut from the master circut. I did look at some code in Andri fabacademy page that code was from him and also was there code i used to make mine, that code was marked to Adrian Torres that was slave and master code.

the assignment¶

i made code with some help from copilot that turn on led when button is pressed and turn it off if button is pressed again. I made the first code very simple just a loop that turn on the led and turn it off but that did work like that if button was pressed then the LED light up onlu while the buton was pressed. Then i ask copilot to change that code to make sure it will turn the LED on and it will stay on until next time the button is pressed, this is the code copilot came up whit then. and that is the code i will use for this project.

code used to turn on and off the LED rp2040

#include <Wire.h>

const int buttonPin = 27;    // Pin where the button is connected
const int ledPin = 28;       // Pin where the LED is connected

bool ledState = LOW;         // Variable to store the LED state
bool buttonState = HIGH;     // Variable to store the button state
bool lastButtonState = HIGH; // Variable to store the last button state

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);  // Initialize the button pin as an input
  pinMode(ledPin, OUTPUT);           // Initialize the LED pin as an output
  digitalWrite(ledPin, ledState);    // Set the initial state of the LED
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed and released
  if (buttonState == LOW && lastButtonState == HIGH) {
    // Toggle the LED state
    ledState = !ledState;
    digitalWrite(ledPin, ledState);
  }

  // Save the current button state as the last button state
  lastButtonState = buttonState;
}

ESP32C3

#include <Wire.h>

const int buttonPin = D1;    // Pin where the button is connected
const int ledPin = D2;       // Pin where the LED is connected

bool ledState = LOW;         // Variable to store the LED state
bool buttonState = HIGH;     // Variable to store the button state
bool lastButtonState = HIGH; // Variable to store the last button state

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);  // Initialize the button pin as an input
  pinMode(ledPin, OUTPUT);           // Initialize the LED pin as an output
  digitalWrite(ledPin, ledState);    // Set the initial state of the LED
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed and released
  if (buttonState == LOW && lastButtonState == HIGH) {
    // Toggle the LED state
    ledState = !ledState;
    digitalWrite(ledPin, ledState);
  }

  // Save the current button state as the last button state
  lastButtonState = buttonState;
}

This is the same code difference is the pin number in RP2040 we use pin 27 for the inoutt and pin 28 for the output but in the ESP32C3 we use the pin number D1 for the input and D2 for the output.

Next will be to finde out how to program this so the circut will talk togeathe r trough I2C bus. That will be some headach.

I will start by checking code that other persons have done in simular circuts, I startet looking at Adrians code that i found here on Andri site this was for the master, Here is the code for the slave but tho i found this code on Andri site the credit for this code goes to Adrian Torres.

This code did not work completley for my project so after few attempts trying to find out how to fix it i turn to my friend Copilot and gave him the code for both master and slave, and Copilot made few changes on the code and it worked great after that.

Here comes the final code i used this is the code i got in the end from copilot: ESP32C3 final code

#include <Wire.h>

const int buttonPin = D1;    // Pin where the button is connected
const int ledPin = D2;       // Pin where the LED is connected

bool ledState = LOW;         // Variable to store the LED state
bool buttonState = HIGH;     // Variable to store the button state
bool lastButtonState = HIGH; // Variable to store the last button state

void setup() {
  Serial.begin(115200); // Speed of the communications

  // Begin Communication, no need for any address because this is the master
  Wire.begin(); 
  pinMode(buttonPin, INPUT_PULLUP);  // Initialize the button pin as an input
  pinMode(ledPin, OUTPUT);           // Initialize the LED pin as an output
  digitalWrite(ledPin, ledState);    // Set the initial state of the LED
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed and released
  if (buttonState == LOW && lastButtonState == HIGH) {
    // Toggle the LED state
    ledState = !ledState;
    digitalWrite(ledPin, ledState);

    // Send the LED state over I2C
    Wire.beginTransmission(8); // Node number 1
    Wire.write(ledState);
    Wire.endTransmission();

    // Print the LED state to the Serial Monitor
    Serial.println(ledState ? "LED ON master" : "LED OFF master");
  }

  // Save the current button state as the last button state
  lastButtonState = buttonState;
}

RP2040 final code

#include <Wire.h>

const int buttonPin = 27;    // Pin where the button is connected
const int ledPin = 28;       // Pin where the LED is connected

bool ledState = LOW;         // Variable to store the LED state
bool buttonState = HIGH;     // Variable to store the button state
bool lastButtonState = HIGH; // Variable to store the last button state

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);  // Initialize the button pin as an input
  pinMode(ledPin, OUTPUT);           // Initialize the LED pin as an output
  digitalWrite(ledPin, ledState);    // Set the initial state of the LED
  Serial.begin(115200);
  Wire.begin(8);     // Change address for the nodes in my case I use 8 and 9.
  Wire.onReceive(receiveEvent);
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed and released
  if (buttonState == LOW && lastButtonState == HIGH) {
    // Toggle the LED state
    ledState = !ledState;
    Serial.println("LED ON NODE 1");
    digitalWrite(ledPin, ledState);
  }

  // Save the current button state as the last button state
  lastButtonState = buttonState;
}

void receiveEvent(int howMany) {
  while (Wire.available()) {
    ledState = Wire.read();
    digitalWrite(ledPin, ledState);
    Serial.println(ledState ? "LED ON NODE 1" : "LED OFF NODE 1");
  }
}

Useful links¶

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