Hello everyone! Im making a project where I read the Temperature and Humidity with a DHT11, and I send those infos to a ThingSpeak channel using a NodeMCU ESP-32. The thing is: im able to send a counter to the channel, and the WiFi signal. Im also able to use the DHT11 sensor, reading the right temp/humi. But when I "adapted" the DHT11 code to the code where I send the infos to the TS channel, the sensor get crazy, reading wrong values and sometimes can't even read. Here are the codes that im using:
The DHT11 code (working fine):
// Example testing sketch for various DHT humidity/temperature sensors written by ladyada
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"
#define DHTPIN 4 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.
// Uncomment whatever type you're using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.println(F("DHTxx test!"));
dht.begin();
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));
}
The code where i adapted the sensor code to the internet connection:
#include <Arduino.h>
#include "WiFi.h"
#include "ThingSpeak.h"
#include "DHT.h"
#define DHTPIN 4
#define CHANNEL_ID 1399592
#define CHANNEL_API_KEY "31xxxxxX9QVFR0"
#define DHTTYPE DHT11
WiFiClient client;
int counter = 0;
DHT dht(DHTPIN, DHTTYPE);
#define WIFI_NETWORK "FGHN"
#define WIFI_PASSWORD "xxxxxxx"
#define WIFI_TIMEOUT_MS 20000
void connectToWiFi(){
Serial.print("Connecting to WiFi");
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_NETWORK, WIFI_PASSWORD);
unsigned long startAttemptTime = millis();
while(WiFi.status() != WL_CONNECTED && millis() - startAttemptTime < WIFI_TIMEOUT_MS){
Serial.print(".");
delay(100);
}
if(WiFi.status() != WL_CONNECTED){
Serial.println("Failed");
}else {
Serial.print("Conectado com Sucesso ao ip: ");
Serial.println(WiFi.localIP());
}
}
void setup() {
Serial.begin(9600);
delay(1000);
connectToWiFi();
ThingSpeak.begin(client);
Serial.println(F("DHTxx test!"));
}
void loop() {
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
delay(2000);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));
ThingSpeak.setField(1,h);
ThingSpeak.setField(2,t);
ThingSpeak.writeFields(CHANNEL_ID, CHANNEL_API_KEY);
delay(15000);
}
This is the error that i get:
............................................Conectado com Sucesso ao ip: 192.168.15.7
DHTxx test!
Failed to read from DHT sensor!
Failed to read from DHT sensor!
Failed to read from DHT sensor!
Failed to read from DHT sensor!
Failed to read from DHT sensor!
Any help will be much appreciated! Thanks!