433MHz RF Wireless Transmitter & Receiver Module Pair – ASK/OOK

The 433MHz RF Wireless Transmitter and Receiver Module Pair provides a simple and economical solution for short-range wireless communication between microcontrollers and electronic projects.

Using ASK/OOK modulation, the modules can transmit basic digital data wirelessly and are suitable for Arduino, embedded systems, remote controls, wireless switches, alarms, sensors, and DIY automation projects.

The set consists of a low-power RF transmitter and matching receiver designed to operate at approximately 433MHz / 433.92MHz, depending on the supplied version.

Transmitter Technical Specifications

• Module Type: RF Transmitter
• Operating Frequency: 433MHz / 433.92MHz version as supplied
• Operating Voltage: 3-12V DC
• Operating Current: Approx. 9mA at 3V to 40mA maximum at 12V as specified
• Modulation: ASK / OOK
• Resonator Type: SAW (Surface Acoustic Wave)
• Transmission Power: Up to 25mW as specified for the 315MHz version at 12V
• Maximum Data Rate: Up to 10kbps as specified
• Frequency Error: Up to ±150kHz as specified
• Built-In Encoding: No

Receiver Technical Specifications

• Module Type: RF Receiver
• Operating Frequency: 433MHz / 433.92MHz version as supplied
• Operating Voltage: 5V DC ±0.5V
• Operating Current: Approx. 5.5mA at 5V
• Modulation: ASK / OOK
• Receiver Bandwidth: Approx. 2MHz as specified
• Sensitivity: Better than approximately -100dBm as specified
• Maximum Data Rate: Less than 9.6kbps under the specified test conditions
• Output: Digital Data Signal

How It Works

The transmitter accepts a digital data signal from a microcontroller or encoder and sends it using an RF carrier. The receiver detects the corresponding ASK/OOK transmission and provides the recovered data signal to the receiving controller.

These modules provide the RF communication link only. They do not include a complete communication protocol, addressing system, error correction, or encryption.

For reliable communication, suitable software libraries or an external encoder/decoder can be used to structure the transmitted data.

Arduino & Microcontroller Applications

The modules can be interfaced with Arduino, ESP32, STM32, PIC, AVR, Raspberry Pi GPIO projects, and other compatible microcontrollers, provided that the appropriate operating voltage and logic requirements are observed.

Typical applications include wireless remote controls, sensor data transmission, home automation, alarm systems, wireless switches, robotics, door sensors, weather stations, and DIY RF experiments.

Antenna Recommendation

Communication range depends strongly on the antenna, supply voltage, RF interference, obstacles, receiver sensitivity, data rate, and installation environment.

For improved range and reliability, a suitable 433MHz antenna should be connected to both modules. A straight quarter-wave wire antenna for approximately 433MHz is around 17.3cm long.

Important Frequency Note

The original manufacturer specifications reference versions between 315MHz and 433.92MHz. These are normally frequency-specific variants.

A 433MHz transmitter should be paired with a compatible 433MHz receiver. The modules should not be assumed to be continuously frequency-adjustable from 315MHz to 433.92MHz.

Always observe local regulations regarding permitted RF frequencies, transmission power, and applications.

Package Includes

1 × 433MHz RF Transmitter Module
1 × 433MHz RF Receiver Module