Capacitive soil moisture sensor with Teensy 4.1

Wiring for the Capacitive soil moisture sensor v1.2 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

Check before you power it on

• Supply: 3.3 V from the 3V pin.

Test code (Arduino)

void setup() {
  Serial.begin(115200);
  analogReadResolution(12);
}

void loop() {
  long mv = (long)analogRead(14) * 3300L / 4095;  // AOUT on 14
  Serial.println(mv);
  delay(200);
}

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 Capacitive soil moisture sensor?

GND → G, VCC → 3V, AOUT → 14 (GPIO_AD_B1_02).

Does the Capacitive soil moisture sensor work with the Teensy 4.1 at 3.3 V?

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

Full Teensy 4.1 pinout · Capacitive soil moisture sensor v1.2: all pins and data

The Capacitive soil moisture sensor 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

Other parts on the Teensy 4.1

BME280 BMP280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20