TMP117 high-accuracy temperature with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x48 / 0x49 / 0x4A / 0x4B Measures temperature

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VIN	Power	3V3
3VO	Not wired to the ESP32	—	3.3 V output of the on-board regulator. Leave unconnected
GND	Ground	GND
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
INT	Interrupt	D35	ALERT output, optional

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

Check it is the real chip

Read register 0x0F: a genuine part answers 0x01. BoardPilot does this automatically in “Debug a problem”.

Starter code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA = GPIO 21, SCL = GPIO 22
  Wire.beginTransmission(0x48);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "TMP117 high-accuracy temperature found at 0x48" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

TI TMP117 datasheet, Device ID register 0x0F = 0x0117 (first byte read is 0x01)
TI TMP117 datasheet, ADD0 pin selects 0x48 to 0x4B; chip supply 1.7 to 5.5 V
Adafruit TMP117 guide, Pinout VIN, 3Vo, GND, SCL, SDA, INT

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

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