Firmata I/O

Projects Interfacing w/ Software on the Computer
1

Hi all,
i'm trying to write what I thought was a simple code for Arduino to write a digital output as a loop using Firmata protocol. I have a software that is sending digital output to Arduino (pin 4) and I want to run a loop (for example blinking internal LED) every time the pin 4 receives inputs. Attached the Arduino Sketch I wrote (without success).

#include <Firmata.h>

byte input = 4;
byte stim_pin = 13;


void setup() {
  Firmata.setFirmwareVersion (FIRMATA_MAJOR_VERSION, FIRMATA_MINOR_VERSION);
  Firmata.attach (DIGITAL_MESSAGE, digitalWriteCallback); 
  Firmata.begin (57600);                                  
  pinMode (input, INPUT);                            
  pinMode (stim_pin, OUTPUT);                                                  
  digitalWrite (stim_pin, LOW);                           
}

void loop() {
  while (Firmata.available()) {                           
  Firmata.processInput();
 }
}

void digitalWriteCallback (byte pin, int value) {         
if (pin == input) {                                  
  digitalWrite (stim_pin, HIGH);                                             
  delay (20);                                          
  digitalWrite (stim_pin, LOW);                                                
  delay (30);                                             
}
else {                                                  
  digitalWrite (stim_pin, LOW);                                          
 }  
}

There is any way to activate a specific pin (loop High - low) on Arduino running firmata when a specific pin on the board is activated (High)?

2

I've deleted your other cross-post @Giuseppe_G.

Cross-posting is against the rules of the forum. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend 15 minutes (or more) writing a detailed answer on this topic, without knowing that someone else already did the same in the other topic.

Repeated cross-posting will result in a suspension from the forum.

In the future, please take some time to pick the forum board that best suits the topic of your question and then only post once to that forum board. This is basic forum etiquette, as explained in the sticky "How to use this forum - please read." post you will find at the top of every forum board. It contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.