Pressure transducer 0.5-4.5 V (water / air) with ESP32

Supply 5 V Bus ANALOG Measures pressure

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VCC	Power	VIN	Red wire. Needs 5 V: use VIN
GND	Ground	GND	Black wire
OUT	Analog output	D34	Yellow, blue or green wire. 0.5 V (0 pressure) to 4.5 V (full scale): use a voltage divider before the ADC

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

This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.

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

void loop() {
  int mv = analogReadMilliVolts(34);  // OUT on GPIO 34
  Serial.println(mv);
  delay(200);
}

Generic G1/4 pressure transducer seller sheet, Supply 5 V, output 0.5 to 4.5 V, linear over the rated range (for example 0 to 1.2 MPa)

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