ESP32 - TMP36 Temperature Sensor
In this guide, we are going to learn how to program ESP32 to read the temperature from the TMP36 sensor.
Hardware Used In This Tutorial
|1||×||ESP-WROOM-32 Dev Module|
|1||×||USB Cable Type-C|
|1||×||TMP36 Temperature Sensor|
|1||×||(Recommended) ESP32 Screw Terminal Adapter|
Or you can buy the following sensor kit:
|1||×||DIYables Sensor Kit 30 types, 69 units|
Introduction to TMP36 Temperature Sensor
TMP36 temperature sensor has three pins:
- GND pin: needs to be connected to GND (0V)
- VCC pin: needs to be connected to VCC (5V)
- +Vs pin: is the power supply for the sensor which can vary between 2.7V to 5.5V.
- Vout pin: signal pin gives the output voltage that is linearly proportional to the temperature, should be connected to a analog pin on ESP32.
How It Works
The TMP36 outputs the voltage linearly proportional to the Centigrade temperature. The output scale factor of the TMP36 is 10 mV/°C. It means that the temperature is calculated by dividing the voltage (mV) in output pin by 10.
This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
How To Program For TMP36 Temperature Sensor
- Get the ADC value from the temperature sensor by using analogRead() function.
- Convert the ADC value to voltage in voltage
- Convert the voltage to the temperature in Celsius
- (Optional) Convert the Celsius to Fahrenheit
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to ESP32
- Grasp the sensor by your hand
- See the result on Serial Monitor.
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