LM35 analog temperature sensor with ESP32

Supply 5 V Bus ANALOG Measures temperature

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
+VS	Power	VIN	Left leg, flat side facing you. Needs at least 4 V: use VIN (5 V)
VOUT	Analog output	D34	Middle leg. 10 mV per °C, 0 mV at 0 °C. To an ADC pin (prefer ADC1: GPIO 32 to 39)
GND	Ground	GND	Right leg

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.

void setup() { Serial.begin(115200); }

void loop() {
  int mv = analogReadMilliVolts(34);  // VOUT on GPIO 34
  Serial.println(mv);
  delay(200);
}

Texas Instruments LM35 datasheet, Pin configuration (TO-92) and 10 mV/°C scale factor
Texas Instruments LM35 datasheet, Supply 4 to 30 V

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.