Capacitive soil moisture sensor with WeAct Black Pill STM32F411CE

Wiring for the Capacitive soil moisture sensor v1.2 on the WeAct Black Pill STM32F411CE (STM32F411CE, 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 3V3 pin.

Test code (Arduino)

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

void loop() {
  long mv = (long)analogRead(PA1) * 3300L / 4095;  // AOUT on A1
  Serial.println(mv);
  delay(200);
}

Arduino board: STMicroelectronics:stm32:GenF4:pnum=BLACKPILL_F411CE,usb=CDCgen,upload_method=dfuMethod. To upload over USB, hold BOOT0, press and release NRST, then release BOOT0 (DFU mode). An ST-LINK on the SWD pins also works.

Questions

Which WeAct Black Pill STM32F411CE pins do I use for the Capacitive soil moisture sensor?

GND → G, VCC → 3V3, AOUT → A1 (PA1).

Does the Capacitive soil moisture sensor work with the WeAct Black Pill STM32F411CE at 3.3 V?

Yes: the Capacitive soil moisture sensor runs at 3.3-5 V and the WeAct Black Pill STM32F411CE uses 3.3 V signals, so no level shifting is needed.

Full WeAct Black Pill STM32F411CE 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 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 WeAct Black Pill STM32F411CE

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