Aduino to RPi

[ibwev]

I am trying to send a string from ProMicro 5V to Raspberry Pi 3.

This is the code I am using in the Pi

/*
  RFSniffer

  Usage: ./RFSniffer [<pulseLength>]
  [] = optional

  Hacked from http://code.google.com/p/rc-switch/
  by @justy to provide a handy RF code sniffer
*/

#include "../rc-switch/RCSwitch.h"
#include <stdlib.h>
#include <stdio.h>
     
     
RCSwitch mySwitch;



int main(int argc, char *argv[]) {
 
     // This pin is not the first pin on the RPi GPIO header!
     // Consult https://projects.drogon.net/raspberry-pi/wiringpi/pins/
     // for more information.
     int PIN = 2;
     
     if(wiringPiSetup() == -1) {
       printf("wiringPiSetup failed, exiting...");
       return 0;
     }

     int pulseLength = 0;
     if (argv[1] != NULL) pulseLength = atoi(argv[1]);

     mySwitch = RCSwitch();
     if (pulseLength != 0) mySwitch.setPulseLength(pulseLength);
     mySwitch.enableReceive(PIN);  // Receiver on interrupt 0 => that is pin #2
     
   
     while(1) {
 
      if (mySwitch.available()) {
   
        int value = mySwitch.getReceivedValue();
   
        if (value == 0) {
          printf("Unknown encoding\n");
        } else {    
   
          printf("Received %i\n", mySwitch.getReceivedValue() );
        }
   
        mySwitch.resetAvailable();
   
      }
     
 
  }

  exit(0);


}

This is the code in ProMicro:

[#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile

RH_ASK driver(2000, 2, 14, 5);;

void setup()
{

    Serial.begin(9600);   // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    Serial.write("on");
    const char *msg = "Hello World!";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(1000);
}

This is the result

This is my wiring schematic:



This is the signal I am receiving on GPIO27 on the Pi:



Please help me understand why I am not seeing "Hello World" on the Putty console when I run

sudo ~/433Utils/RPi_utils/RFSniffer

 

[Les Jones]

The RFSniffer program that you are running on the Raspberry Pi is expecting to see the sort of data stream sent by a remote control keyfob. You are sending an ASCII string at 9600 bauds to it . It will not be able to make any sense of this.

Les.