Battery Powered ESP8266 Temperature/Humidity Monitor with DHT11

bestes · November 6, 2016, 6:14pm

@pearl3 here are some projects that were made with NodeMCU, feel free to peruse and ask them questions

pearl3 · November 6, 2016, 6:22pm

I’m already in contact with Rich (Garage Door Opener) on Facebook. He told me about cayenne.

But we two also had no luck to get HTU21d running.

adam · November 6, 2016, 6:23pm

I don’t have a nodeMCU to test with but one thing I can see is that you have the temp function commented out but still waiting for it to run in your if statements. Also, make sure you have a widget on your dashboard for V0 and V1 otherwise it will never execute those functions. Try the code below:

//#define CAYENNE_DEBUG
#define CAYENNE_PRINT Serial
// #define DHTTYPE DHT11
// #define DHTPIN  14

#include "CayenneDefines.h"
#include "BlynkSimpleEsp8266.h"
#include "CayenneWiFiClient.h"
// #include <DHT.h>
#include <SparkFunHTU21D.h>

// Cayenne authentication token. This should be obtained from the Cayenne Dashboard.
char token[] = "";
// Your network name and password.
char ssid[] = "";
char password[] = "";
//Variables for DHT11 values
//float h, t, hif;
float h, t;
bool Humidity = false;
bool Temperature = false;
//bool HeatIndex = false;

//DHT dht(DHTPIN, DHTTYPE);
HTU21D myHumidity;

void setup()
{
  Serial.begin(9600);
  Serial.print("Setup");
  Cayenne.begin(token, ssid, password);

  Humidity = false;
  Temperature = false;
  //HeatIndex = false;
}

void loop()
{
  //Run Cayenne Functions
  Cayenne.run();
  //Check if we got all values we wanted and sleep for 10 minutes if we did
  // if (Humidity && Temperature && HeatIndex){
    if (Humidity && Temperature){
    Serial.println("Got all values - sleeping");
    delay(100);
    ESP.deepSleep(60000000, WAKE_RF_DEFAULT);
    delay(100);
  }
}

CAYENNE_OUT(V0){
  Serial.println("Entered Humidity");

  //Check if read failed and try until success
  do {
    //Read humidity (percent)
    // h = dht.readHumidity();
    h = myHumidity.readHumidity();

    delay(1000);
  } while  (isnan(h));

  Serial.print("Humidity: ");
  Serial.println(h);

  //Set Humidity to true so we know when to sleep
  Humidity = true;

  //Write to Cayenne Dashboard
  Cayenne.virtualWrite(V0, h);
}

CAYENNE_OUT(V1){
  Serial.println("Entered Temperature");
  
  //Check if read failed and try until success
  do {
    //Read temperature as Fahrenheit
    // t = dht.readTemperature(true);
    t = myHumidity.readTemperature();

    delay(1000);
  } while  (isnan(t));

  Serial.print("Temperature: ");
  Serial.println(t);

  //Set Temperature to true so we know when to sleep
  Temperature = true;

  //Write to Cayenne Dashboard
  Cayenne.virtualWrite(V1, t);
}

/*CAYENNE_OUT(V2){
  Serial.println("Entered Heat Index");

  //Check if read failed and try until success
  do {
    //Read humidity (percent)
    h = dht.readHumidity();
    //Read temperature as Fahrenheit
    t = dht.readTemperature(true);
    //Calculate Heat Index as Fahrenheit
    hif = dht.computeHeatIndex(t, h);
  } while  (isnan(t) || isnan(h));

  Serial.print("Heat Index: ");
  Serial.println(hif);

  //Set HeatIndex to true so we know when to sleep
  HeatIndex = true;

  //Write to Cayenne Dashboard
  Cayenne.virtualWrite(V2, hif);
} */

adam · November 6, 2016, 6:24pm

Another question for you, were you able to read the HTU21d and print to serial with a very basic sketch without Cayenne?

pearl3 · November 6, 2016, 6:37pm

Indeed i made the /* at the wrong line. But unfortunately this was not the solution

pearl3 · November 6, 2016, 6:38pm

Yes, i used his sensor before for an standalone temp/hum projet with lcd display.

adam · November 6, 2016, 7:03pm

Try this for your loop:

void loop()
{
  //Run Cayenne Functions
  Cayenne.run();
  delay(100);
  //Check if we got all values we wanted and sleep for 10 minutes if we did
  // if (Humidity && Temperature && HeatIndex){
    if (Humidity && Temperature){
    Serial.println("Got all values - sleeping");
    delay(100);
    ESP.deepSleep(60000000, WAKE_RF_DEFAULT);
    delay(100);
  }
}

kreggly · November 6, 2016, 7:14pm

Also, monitor your voltage. This can easily happen with the ESPs if you are running on a battery that can’t provide the transmit current of 80+ mA.

Craig

pearl3 · November 6, 2016, 8:22pm

Thanks but no better results:

bBÊ¦5bäöÎÊ¦ýÿSetup[261] Connecting to networxSAVE2
[2264] Connected to WiFi
[2264] My IP: 192.168.200.37
[5065] Connecting to arduino.mydevices.com:8442
[5438] Ready (ping: 100ms).
Entered Temperature

Exception (28):
epc1=0x40203f45 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

ctx: cont 
sp: 3ffef7f0 end: 3ffefb00 offset: 01a0

>>>stack>>>
3ffef990:  3ffe8504 3ffefa44 3ffeea10 40203f41  
3ffef9a0:  00007276 3ffeea10 3ffee7cc 4020404b  
3ffef9b0:  3fff0bb4 3ffeea10 00000001 40202a16  
3ffef9c0:  3ffefa30 3ffefa44 00000001 40202cf0  
3ffef9d0:  3ffefa40 3fff0bb4 3fff0a84 40203d52  
3ffef9e0:  3ffefa01 3ffee808 00000031 40203d8e  
3ffef9f0:  3ffee700 3ffee808 3ffeeae0 3ffefa43  
3ffefa00:  3ffee7d4 00000004 40204bc8 3ffeeae0  
3ffefa10:  00000005 3ffefa40 3ffee7d4 3ffefa40  
3ffefa20:  00000004 00000001 3ffee7d4 40202f66  
3ffefa30:  00000000 3ffee7f4 3ffee7d4 40202dc8  
3ffefa40:  31007276 3f003000 3ffeeacc 00000030  
3ffefa50:  04000314 00002000 3ffeeae0 3ffee7f4  
3ffefa60:  00000004 3ffefa40 40204bc8 3ffeeae0  
3ffefa70:  3ffe84a0 000020fa 3ffee7d4 00000001  
3ffefa80:  00000000 3ffee7f4 3ffee7d4 40203155  
3ffefa90:  4010599c 0032add5 3ffee8b4 00000000  
3ffefaa0:  3ffee1f0 3ffee8b4 3ffeeae0 3ffee8b4  
3ffefab0:  3ffee7f4 3ffeeacc 40204bc8 3ffeeae0  
3ffefac0:  4020151e 00000064 00000064 3ffeeacc  
3ffefad0:  3fffdad0 00000000 3ffeeac4 40203193  
3ffefae0:  3fffdad0 00000000 3ffeeac4 40204c14  
3ffefaf0:  feefeffe feefeffe 3ffeeae0 40100718  
<<<stack<<<

pearl3 · November 6, 2016, 9:51pm

As you can see, sensor is working with SparkFun HTU21s sample sketch in the same setup:

0‚~?–4“Ò¶£ÿOCAEüûHTU21D Example!
Time:326 Temperature:22.5C Humidity:44.3%
Time:1398 Temperature:22.5C Humidity:44.3%
Time:2471 Temperature:22.5C Humidity:44.3%
Time:3543 Temperature:22.5C Humidity:44.3%
Time:4616 Temperature:22.5C Humidity:44.3%
Time:5688 Temperature:22.5C Humidity:44.3%

HighTech · November 7, 2016, 12:41am

I’d like to know how much current the ESP devices draw, too.
My Fluke ammeter only has 3.5 digit resolution,
and only down to 1/100th an amp, so it only shows 00.01 A.
Not accurate enough.
I need a milliammeter.
I don’t have one.

I’d surely like to know.
I’m imagining the ESP12-e draws
something like 35 mA (milliamps),
-just a WAG.

kreggly · November 7, 2016, 4:08pm

Do you Google Bro?

Spec sheet says 80 mA, I’ve measured 86 or so for my modules.

On the raw modules, you need to put at least a 220uF capacitor across the 3V3 to keep it from resetting when connecting to the cloud server. Perhaps if I use multi-core wire for connection, this wouldn’t be as necessary… but a capacitor works.

Craig

HighTech · November 7, 2016, 6:38pm

I’ve been becoming fond of using the 78SR3.3 voltage regulators.
It works well for me,
while using a 47 muff cap on either side of the regulator.

That 220 muff cap takes up a lot of real estate,
but changing the 47 muff cap
to a 1 muff cap wouldn’t gain me much space,
and 47 muffs is (much) more than adequate.

The 78SR3.3 is a VERY efficient switcher,
and also allows for a VCC of up to +36,
and eliminating the need of a large +V filter capacitor-
it’s a switching regulator, as such (by definition) filters out AC line ripple
and other spurious electrical noise.

It would be interesting to see
how long 2 standard 9V batteries (in series) would last
in this configuration.
The minimum V(in) voltage on the 78SR3.3 is 7.5V.

@kreggly - I’ve vaguely heard of Google.
I can’t quite pin where I’ve heard that term before…

http://www.kloppenborg.net/images/blog/esp8266/esp8266-esp12e-specs.pdf

bilalmalikuet · November 7, 2016, 7:31pm

I like this project I am going to implement similar project for green house control system

pearl3 · November 8, 2016, 8:43pm

Any other hints for my problem? I’m pretty sure this is not a voltage problem as i had othr projects with blynk i.e. before…

kreggly · November 8, 2016, 8:47pm

Install this, GitHub - me-no-dev/EspExceptionDecoder: Exception Stack Trace Decoder for ESP8266 and ESP32, and see what it says.

Also, post your whole sketch and one of us can try it and see if we can repeat your error.

Craig

pearl3 · November 8, 2016, 8:48pm

Or is there anybody with nodeMCU an HTU who can copy my setup?

kreggly · November 8, 2016, 9:15pm

Maybe, if you post your full sketch

Craig

pearl3 · November 8, 2016, 9:18pm

You will find it up there 38/58

//#define CAYENNE_DEBUG
#define CAYENNE_PRINT Serial
// #define DHTTYPE DHT11
// #define DHTPIN  14

#include "CayenneDefines.h"
#include "BlynkSimpleEsp8266.h"
#include "CayenneWiFiClient.h"
// #include <DHT.h>
#include <SparkFunHTU21D.h>

// Cayenne authentication token. This should be obtained from the Cayenne Dashboard.
char token[] = "";
// Your network name and password.
char ssid[] = "";
char password[] = "";
//Variables for DHT11 values
//float h, t, hif;
float h, t;
bool Humidity = false;
bool Temperature = false;
//bool HeatIndex = false;

//DHT dht(DHTPIN, DHTTYPE);
HTU21D myHumidity;

void setup()
{
  Serial.begin(9600);
  Serial.print("Setup");
  Cayenne.begin(token, ssid, password);

  Humidity = false;
  Temperature = false;
  //HeatIndex = false;
}

void loop()
{
  //Run Cayenne Functions
  Cayenne.run();
  delay(100);
  //Check if we got all values we wanted and sleep for 10 minutes if we did
  // if (Humidity && Temperature && HeatIndex){
    if (Humidity && Temperature){
    Serial.println("Got all values - sleeping");
    delay(100);
    ESP.deepSleep(60000000, WAKE_RF_DEFAULT);
    delay(100);
  }
}

CAYENNE_OUT(V0){
  Serial.println("Entered Humidity");

  //Check if read failed and try until success
  do {
    //Read humidity (percent)
    // h = dht.readHumidity();
    h = myHumidity.readHumidity();

    delay(1000);
  } while  (isnan(h));

  Serial.print("Humidity: ");
  Serial.println(h);

  //Set Humidity to true so we know when to sleep
  Humidity = true;

  //Write to Cayenne Dashboard
  Cayenne.virtualWrite(V0, h);
}

CAYENNE_OUT(V1){
  Serial.println("Entered Temperature");
  
  //Check if read failed and try until success
  do {
    //Read temperature as Fahrenheit
    // t = dht.readTemperature(true);
    t = myHumidity.readTemperature();

    delay(1000);
  } while  (isnan(t));

  Serial.print("Temperature: ");
  Serial.println(t);

  //Set Temperature to true so we know when to sleep
  Temperature = true;

  //Write to Cayenne Dashboard
  Cayenne.virtualWrite(V1, t);
}

/*CAYENNE_OUT(V2){
  Serial.println("Entered Heat Index");

  //Check if read failed and try until success
  do {
    //Read humidity (percent)
    h = dht.readHumidity();
    //Read temperature as Fahrenheit
    t = dht.readTemperature(true);
    //Calculate Heat Index as Fahrenheit
    hif = dht.computeHeatIndex(t, h);
  } while  (isnan(t) || isnan(h));

  Serial.print("Heat Index: ");
  Serial.println(hif);

  //Set HeatIndex to true so we know when to sleep
  HeatIndex = true;

  //Write to Cayenne Dashboard
  Cayenne.virtualWrite(V2, hif);
} */

adam · November 9, 2016, 1:59am

Take a seat @kreggly!

Anyway…let’s try doing some serial prints to see where you’re getting caught up. Try this and post the output.

void setup()
{
  Serial.begin(9600);
  Serial.print("Setup");
  Cayenne.begin(token, ssid, password);
  Serial.print("Cayenne setup");

  Humidity = false;
  Temperature = false;
  //HeatIndex = false;
}

void loop()
{
  //Run Cayenne Functions
  Serial.print("Begin loop");
  Cayenne.run();
  Serial.print("End Cayenne.run");
  delay(100);
  //Check if we got all values we wanted and sleep for 10 minutes if we did
  // if (Humidity && Temperature && HeatIndex){
    if (Humidity && Temperature){
    Serial.println("Got all values - sleeping");
    delay(100);
    ESP.deepSleep(60000000, WAKE_RF_DEFAULT);
    delay(100);
  }
  Serial.print("End loop");
}

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