DS18B20 with Teensy 4.1

Wiring for the DS18B20 waterproof temperature probe on the Teensy 4.1 (MIMXRT1062DVJ6B, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

DS18B20 pin	Role	Teensy 4.1 pin	Notes
VDD	Power	3V	Red wire
DQ	One-wire data	2 (GPIO_EMC_04)	Yellow (sometimes white) wire. Needs a 4.7 kΩ pull-up to 3.3 V
GND	Ground	G	Black wire

Check before you power it on

Supply: 3.3 V from the 3V pin.

Test code (Arduino)

// Library: OneWire, DallasTemperature
#include <OneWire.h>
#include <DallasTemperature.h>

OneWire bus(2);  // needs a 4.7 kΩ pull-up from DQ to VDD
DallasTemperature sensors(&bus);

void setup() {
  Serial.begin(115200);
  sensors.begin();
  Serial.print("Sensors found: ");
  Serial.println(sensors.getDeviceCount());
}

void loop() {
  sensors.requestTemperatures();
  Serial.println(sensors.getTempCByIndex(0));
  delay(1000);
}

Arduino board: teensy:avr:teensy41. Press the white program button once if the upload waits for the board.

Questions

Which Teensy 4.1 pins do I use for the DS18B20?

VDD → 3V, DQ → 2 (GPIO_EMC_04), GND → G.

Does the DS18B20 work with the Teensy 4.1 at 3.3 V?

Yes: the DS18B20 runs at 3.3-5 V and the Teensy 4.1 uses 3.3 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Teensy 4.1 pinout · DS18B20 waterproof temperature probe: all pins and data

The DS18B20 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico

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