433 MHz transmitter (FS1000A) with ESP32

Supply 3-12 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
DATA	Input (the ESP32 drives it)	D25	Data from an ESP32 GPIO (RadioHead RH_ASK or rc-switch)
VCC	Power	3V3	3 to 12 V. Higher voltage gives more range
GND	Ground	GND
ANT	Not wired to the ESP32	—	Antenna pad: solder a 17.3 cm wire for 433 MHz

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

void setup() { pinMode(25, OUTPUT); }  // DATA

void loop() {
  digitalWrite(25, HIGH);
  delay(500);
  digitalWrite(25, LOW);
  delay(500);
}

FS1000A 433 MHz transmitter module datasheet, Pins DATA, VCC, GND; supply 3 to 12 V; ASK/OOK modulation

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