RF signal from Arduino Micro to RPi

Projects General Guidance
1

Hi,

I have an arduino micro and a RPi.

I am trying to connect these two using 433MHz RF links with the arduino transmitting and the RPi receiving.

I have programmed a RGB sensor (ISL29125) to read red light levels and when the reading drops below a set value i changes from 0 to 1.

I want to transmit i to the pi and when the pi receives a 1 I want it to launch kweb browser.

I am new to this with little knowledge so any help would be greatly appreciated.

Thanks

/**********************************************
Adam Wallace - FYDP Code
Abnormality Sensor - RGB Sensor
**********************************************/

#include <Wire.h>
#include <SparkFunISL29125.h>

  // Declare sensor object
   SFE_ISL29125 RGB_sensor;

  unsigned int i = 0; // The number of triggered interrupts

void setup() 
{
  
  // Set up Notification LED pins
  pinMode(4, OUTPUT); // set pin 4 as output
  pinMode(5, OUTPUT); // set pin 5 as output
  pinMode(6, OUTPUT); // set pin 6 as output
  pinMode(7, OUTPUT); // set pin 7 as output
  pinMode(8, OUTPUT); // set pin 8 as output
  pinMode(9, OUTPUT); // set pin 9 as output
  pinMode(10, OUTPUT); // set pin 10 as output
  pinMode(11, OUTPUT); // set pin 11 as output
  pinMode(12, OUTPUT); // set pin 12 as output

  // Set up RF transmitter pin
  pinMode(1, OUTPUT); //set TX pin as output
  
  // Initialize serial communication - USB and TTL
  Serial1.begin(9600);
  Serial.begin(9600);
    
  // Initialize the RGB Sensor
  (RGB_sensor.init());
  
}

void loop() 
{
  
  static unsigned int lasti = 0; // Stores the number of the last interrupt

  // Turn notification LEDs on
  digitalWrite(4, HIGH); // set pin 4 as high
  digitalWrite(5, HIGH); // set pin 5 as high
  digitalWrite(6, HIGH); // set pin 6 as high
  digitalWrite(7, HIGH); // set pin 7 as high
  digitalWrite(8, HIGH); // set pin 8 as high
  digitalWrite(9, HIGH); // set pin 9 as high
  digitalWrite(10, HIGH); // set pin 10 as high
  digitalWrite(11, HIGH); // set pin 11 as high
  digitalWrite(12, HIGH); // set pin 12 as high

  // Set RF transmitter pin high
  digitalWrite(1, HIGH); // set TX pin output low

    {
        // Read the detected light intensity of the red visible spectrum
        RGB_sensor.readRed();

        // Print out the i value used for communication when red light levels are low
        Serial.print("i # = ");
        Serial.println(i);
        Serial.println(RGB_sensor.readRed());
        
        Serial1.print(i);
        delay (500);
    
        // Set lasti to i, so that this if statement is not entered again until another interrupt is triggered
        i = lasti;
    }
  
  if (RGB_sensor.readRed() < 350)
    {
    i = 1; // when red light levels are low i = 1
    } 
      
}

Sensor_FYDP.ino (2.21 KB)

2

Please show us how you have the wireless modules connected and a link to the modules.

Weedpharma

3

If the 433 Mhz modules are the el cheapo OOK modules then its not possible, unless you can compile
the Virtualwire library for the Pi.
The easiest way to do this would be to use 2 of these.
http://www.topelectronics.com.au/image-eb/HC11/HC11.pdf
You can then simply use the Serial ports on the Arduino and the Pi.