Published August 15, 2017 © GPL3+

2-Way Particle Photon Communication

Make two Particle Photons "talk" via the usage of webhooks!

BeginnerShowcase (no instructions)1 hour2,490

Things used in this project

Hardware components

Particle Photon

Software apps and online services

Particle Online IDE

Particle Cloud Console

Story

Overview

2-way communication between MCUs can seem like a daunting task, but this project will help to simplify it. Particle Photons can utilize webhooks, enabling them to send data back and forth via a web protocol.

Steps

First, I got 2 Particle Photons and set them up using the Android app.

Next, I created a new Photon sketch. In setup, I added the line:

Particle.publish("test", "This is a test");

And in loop, I added:

while(1){ 
       char buffer[32]; 
       char *str_counter = itoa(counter, buffer, 10); 
       Particle.publish("test", str_counter); 
       counter++; 
       delay(5000); 
   }

Next I created another sketch for my second Particle Photon. It will check if new data arrives and then store it in a cloud variable so I can see it in the cloud console. I copied and pasted the finished code, but replaced "test" with "test2" and the subscribe line with it subscribing to "test" instead. Read the attached code for the entire program.

That's it! Now your two Particle Photons can share data with each other, and you can view their data on the cloud console, all remotely.

Code

#include <stdio.h>
#include <stdlib.h>

int counter = 0;
char *message;

void setup() {
    Particle.publish("test", "This is a test");
    Particle.subscribe("test2", handler);
    Particle.variable("Message", message);
}

void loop() {
    
    while(1){
        char buffer[32];
        char *str_counter = itoa(counter, buffer, 10);
        Particle.publish("test", str_counter);
        counter++;
        delay(5000);
    }
}

void handler(const char *event, const char *data){
    if(data){
        message = const_cast<char*> (data);
    }
}

#include <stdio.h>
#include <stdlib.h>

int counter = 0;
char *message;

void setup() {
    Particle.publish("test2", "This is a test");
    Particle.subscribe("test", handler);
    Particle.variable("Message", message);
}

void loop() {
    while(1){
        char buffer[32];
        char *str_counter = itoa(counter, buffer, 10);
        Particle.publish("test", str_counter);
        counter++;
        delay(5000);
    }
}

void handler(const char *event, const char *data){
    if(data){
        message = const_cast<char*> (data);
    }
}

Credits

Evan Rust

122 projects • 1091 followers

IoT, web, and embedded systems enthusiast. Contact me for product reviews or custom project requests.

2-Way Particle Photon Communication

Things used in this project

Hardware components

Software apps and online services

Story

Overview

Steps

Schematics

Schematic

Code

First Photon

Second Photon

Credits

Evan Rust

Comments

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2-Way Particle Photon Communication

2-Way Particle Photon Communication

Things used in this project

Hardware components

Software apps and online services

Story

Overview

Steps

Schematics

Schematic

Code

First Photon

Second Photon

Credits

Evan Rust

Comments

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