Photon Stuck in Green Breathing

Photon Stuck in green breathing after uploading a new app. Initially appears to connect to the cloud and then disconnects. Looking for help in clearing the app to determine what went wrong. Believe I may have pushed the delay in my app a little too far.


We can’t help you without seeing your code.

// This #include statement was automatically added by the Particle IDE.
#include "blynk/blynk.h"

// This #include statement was automatically added by the Particle IDE.
#include "PietteTech_DHT/PietteTech_DHT.h"

// system defines
#define DHTTYPE  DHT22              // Sensor type DHT11/21/22/AM2301/AM2302
#define DHTPIN   2         	    // Digital pin for communications
#define DHT_SAMPLE_INTERVAL   60000  // Sample every minute

void dht_wrapper(); // must be declared before the lib initialization

// Lib instantiate
PietteTech_DHT DHT(DHTPIN, DHTTYPE, dht_wrapper);

// globals
unsigned int DHTnextSampleTime;	    // Next time we want to start sample
bool bDHTstarted;		    // flag to indicate we started acquisition
int n;                              // counter

//this is coming from
char resultstr[64]; //String to store the sensor data

char auth[] = ""; // Put your blynk token here

char VERSION[64] = "0.04";

#define READ_INTERVAL 60000

void setup()

 DHTnextSampleTime = 0;  // Start the first sample immediately
 Particle.variable("result", resultstr, STRING);

 Particle.publish("DHT22 - firmware version", VERSION, 60, PRIVATE);

// This wrapper is in charge of calling
// must be defined like this for the lib work
void dht_wrapper() {

void loop()
{; // all the Blynk magic happens here

  // Check if we need to start the next sample
  if (millis() > DHTnextSampleTime) {
	if (!bDHTstarted) {		// start the sample
	    bDHTstarted = true;

 if (!DHT.acquiring()) {		// has sample completed?

  float temp = (float)DHT.getCelsius();
  int temp1 = (temp - (int)temp) * 100;

  char tempInChar[32];
  sprintf(tempInChar,"%0d.%d", (int)temp, temp1);
  Particle.publish("The temperature from the dht22 is:", tempInChar, 60, PRIVATE);

  //virtual pin 1 will be the temperature
  Blynk.virtualWrite(V1, tempInChar);
  //google docs can get this variable
  sprintf(resultstr, "{\"t\":%s}", tempInChar);

  float humid = (float)DHT.getHumidity();
  int humid1 = (humid - (int)humid) * 100;

  sprintf(tempInChar,"%0d.%d", (int)humid, humid1);
  Particle.publish("The humidity from the dht22 is:", tempInChar, 60, PRIVATE);

  //virtual pin 2 will be the humidity
  Blynk.virtualWrite(V2, tempInChar);

  n++;  // increment counter
  bDHTstarted = false;  // reset the sample flag so we can take another
  DHTnextSampleTime = millis() + DHT_SAMPLE_INTERVAL;  // set the time for next sample


Please edit your post to format your code. It needs to be done like this,


One possible problem could be the Blynk.begin(auth) line. I tested that with no auth string or an incorrect auth string, and I got the breathing green after initially connecting. You should put some Serial print statements in a couple of places to see what parts of your code are executing.

After Edit:

I just found a DHT22 in my stuff, and I tested your code. It works fine for me with a proper auth code.


Maybe it gets stuck in some loop inside dht22 library and connectivity to the cloud is lost. I remember I faced something similar some time ago but I don’t remember where exactly.

At this point I’d just like to get the app off so I try again. How can I stop this app and get it to connect to the ide again so I can make some changes?

@fritts, simply put your photon in safe mode.

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