Capacitive soil moisture sensor with Arduino Nano

Wiring for the Capacitive soil moisture sensor v1.2 on the Arduino Nano (ATmega328P, 5 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: 5 V from the 5V pin.

Test code (Arduino)

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

void loop() {
  long mv = (long)analogRead(14) * 5000L / 1023;  // AOUT on A0
  Serial.println(mv);
  delay(200);
}

Arduino board: arduino:avr:nano. Clones with the old bootloader upload at 57600 baud: choose “ATmega328P (Old Bootloader)” if uploads fail.

Questions

Which Arduino Nano pins do I use for the Capacitive soil moisture sensor?

GND → GND, VCC → 5V, AOUT → A0 (PC0).

Does the Capacitive soil moisture sensor work with the Arduino Nano at 5 V?

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

Full Arduino Nano 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 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 Teensy 4.1

Other parts on the Arduino Nano

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