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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 | × | Breadboard | |
| 1 | × | Jumper Wires | |
| 1 | × | (Recommended) ESP32 Screw Terminal Adapter |
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Introduction to TMP36 Temperature Sensor
Pinout
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.
Wiring Diagram
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.
int adcVal = analogRead(PIN_TMP36);
- Convert the ADC value to voltage in voltage
float voltage = adcVal * (3.3 / 4095.0);
- Convert the voltage to the temperature in Celsius
float tempC = (voltage - 0.5) * 100;
- (Optional) Convert the Celsius to Fahrenheit
float tempF = tempC * 9 / 5 + 32;
ESP32 Code
/*
* This ESP32 code is created by esp32io.com
*
* This ESP32 code is released in the public domain
*
* For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-tmp36-temperature-sensor
*/
#define ADC_VREF 3.3 // 3.3V
#define ADC_RESOLUTION 4095.0
#define PIN_TMP36 36 // ESP32 pin GPIO36 (ADC0) connected to LM35
void setup() {
Serial.begin(9600);
}
void loop() {
// get the ADC value from the TMP36 temperature sensor
int adcVal = analogRead(PIN_TMP36);
// convert the ADC value to voltage
float voltage = adcVal * (ADC_VREF / ADC_RESOLUTION);
// convert the voltage to the temperature in Celsius
float tempC = (voltage - 0.5) * 100;
// convert the Celsius to Fahrenheit
float tempF = tempC * 9 / 5 + 32;
// print the temperature in the Serial Monitor:
Serial.print("TMP36 Temperature: ");
Serial.print(tempC); // print the temperature in Celsius
Serial.print("°C");
Serial.print(" ~ "); // separator between Celsius and Fahrenheit
Serial.print(tempF); // print the temperature in Fahrenheit
Serial.println("°F");
delay(1000);
}
Quick Instructions
- 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.
COM6
TMP36 Temperature: 26.31°C ~ 79.36°F
TMP36 Temperature: 26.44°C ~ 79.59°F
TMP36 Temperature: 26.50°C ~ 79.70°F
TMP36 Temperature: 26.56°C ~ 79.81°F
TMP36 Temperature: 27.06°C ~ 80.71°F
TMP36 Temperature: 27.75°C ~ 81.95°F
TMP36 Temperature: 28.37°C ~ 83.07°F
TMP36 Temperature: 29.00°C ~ 84.20°F
TMP36 Temperature: 29.56°C ~ 85.21°F
TMP36 Temperature: 30.00°C ~ 86.00°F
TMP36 Temperature: 30.31°C ~ 86.56°F
TMP36 Temperature: 30.62°C ~ 87.12°F
TMP36 Temperature: 30.87°C ~ 87.57°F
Autoscroll
Clear output
9600 baud
Newline
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