Temperature Sensor Tutorial for DHT11, DHT22, AM2302, RHT03

In this section we’ll walk through creating a Temperature Sensor using ESP32, ESP8266 and then view the temperature via Alexa, Google Home or SmartThings.

Prerequisites :

  1. ESP32, ESP8266 x 1.
  2. DHT11 or DHT22, AM2302, RHT03 x 1.
  3. Jumper Wires.

Quick introduction to Temperature Sensor

The DHT and AM series are low-cost digital sensor for sensing temperature and humidity. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and then spits out a digital signal on the data pin.


Sinric Pro esp8266 DHT22 wiring

Note: Some DHT22 sensors do not come with a pull-up resistor, so you may need to connect one yourself. A 10k resistor is typically used, and it should be connected from the data pin of the sensor to the +3.3V or +5V power supply.

ESP32 16
ESP8266 14 (D5)

Let’s verify that temperature is wired correctly and working.

Arduino IDE Serial Monitor will show the current temperature like this

Sinric Pro DHT Temperature Sensor

Step 1 : Create a new device in Sinric Pro

Sinric Pro create device alexa

Sinric Pro temperature sensor device notifications

You can set the threshold here to receive a push notification via the Sinric Pro app when the temperature goes below or above a certain temperature. Use the Retrigger Time to set the delay between notifications.

Sinric Pro copy device id

Step 2 : Connect to Sinric Pro

Step 2.1 Install Sinric Pro Library

Sinric Pro install SinricPro library

You can generate the code using Zero Code feature or write it by your self. If you do not have programming experice, we recommend to use Zero Code feature in the Portal to generate the code, download and flash.

2.2 Complete Code

Now you should be able to view the temperature via Sinric Pro App

Sinric Pro App Temperature Sensor

Charts via Portal

Sinric Pro Portal Temperature Sensor

Alexa, Google Home and SmartThings

Sinric Pro Portal Temperature Sensor

Please note that Google Home App shows the temperature sensor as a Thermostat due to Google Home limitations.


  1. error: no matching function for call to ‘DHT::DHT()’ or error: ‘class DHT’ has no member named ‘getMinimumSamplingPeriod’

    Solution: Please make sure correct DHT library is installed. This example was made with https://github.com/markruys/arduino-DHT. Remove any other DHT libraries you may have previously installed eg: https://github.com/adafruit/DHT-sensor-library

  2. Please refer to our Troubleshooting page for more details.

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