433MHz ASK Wireless Transmitter Receiver Module

Connect the transmitter's DATA pin to a digital GPIO on your microcontroller. For the receiver, connect its DATA pin to another digital input GPIO. Ensure a common ground between the module and MCU. Use simple digital write/read functions or a library like VirtualWire or RCSwitch to encode/decode data. Power the modules within their specified voltage range (1.5-5V for RX, 3-6V for TX). Remember, this is a raw RF link, not UART, so you need to manage timing and encoding in your firmware.

The typical range is 30 meters in open space, potentially up to 50 meters under ideal conditions. Range is significantly reduced by walls, metal obstructions, and electrical noise. To improve range, ensure a stable power supply, use a proper 433MHz antenna (like a 17.3cm wire whip) soldered to the ANT pad, elevate the modules, and orient antennas vertically. Reducing the data rate can also improve reliability. Avoid placing the modules near switching power supplies or microcontrollers, as digital noise can interfere with the sensitive receiver.

No, this module does not support direct UART communication. It uses ASK modulation for transmitting digital on/off signals. To send data from a PC, you would need a microcontroller (like an Arduino) to read the PC's serial data and convert it into the appropriate timing pulses for the transmitter. Similarly, the receiver outputs a demodulated digital signal that a microcontroller must interpret. The 433MHz band also has inherent noise, so implementing software-based error checking or a simple protocol in your MCU code is highly recommended for reliable communication.

These modules do not have a dedicated sleep or enable pin. The transmitter consumes its typical 11mA whenever powered. The receiver draws its 3.5mA continuously when powered. For ultra-low-power applications, you must physically switch off the modules using a MOSFET or transistor controlled by your microcontroller's GPIO to cut power entirely between transmissions or readings. This allows you to achieve an average current draw in the microamp range, making them suitable for battery-powered sensor nodes that wake up periodically to send data.