ESP32 Digital Temperature Sensor with Arduino IDE

Introduction

The Digital Temperature Sensor is used to measure temperature and provide a digital output signal. The sensor continuously monitors the surrounding temperature and changes its output state when a preset threshold is reached. The ESP32 can read this digital signal and determine whether the temperature is above or below the threshold. In this tutorial, we’ll interface a Digital Temperature Sensor with the ESP32 and monitor its status through the Serial Monitor.

Required Components

• ESP32 Board
• Digital Temperature Sensor Module
• Jumper wires
• Breadboard

Pinout

Circuit Diagram / Wiring

• Digital Temperature Sensor VCC → 3.3V (ESP32)
• Digital Temperature Sensor GND → GND (ESP32)
• Digital Temperature Sensor DO → GPIO 15 (ESP32)

Code / Programming

/*
  Filename: ol_digital_temperature_sensor.ino
  Description: Reads digital temperature sensor status and prints result via Serial Monitor
  Author: www.oceanlabz.in
  Modification: 1/4/2025
*/

#define TEMP_SENSOR_PIN 15

void setup() {
  Serial.begin(115200);
  pinMode(TEMP_SENSOR_PIN, INPUT);
}

void loop() {
  int sensorState = digitalRead(TEMP_SENSOR_PIN);

  if (sensorState == LOW) {
    Serial.println("Temperature Above Threshold");
  } else {
    Serial.println("Temperature Below Threshold");
  }

  delay(500);
}

Explanation

• The TEMP_SENSOR_PIN reads the digital output from the temperature sensor module.
• The sensor compares the measured temperature with the threshold set by the onboard potentiometer.
• When the temperature exceeds the threshold value, the sensor output changes state.
• The ESP32 continuously monitors the sensor output and displays the status on the Serial Monitor.

Troubleshooting

• Ensure that the sensor is powered correctly (VCC to 3.3V and GND to GND) and that the DO pin is connected to GPIO 15.
• If the sensor does not respond, adjust the onboard potentiometer to set an appropriate temperature threshold.
• If the readings appear unstable, check the wiring connections and ensure a stable power supply.
• If no messages appear in the Serial Monitor, verify that the correct COM port and ESP32 board are selected in the Arduino IDE.