RX470 433 MHz Superheterodyne RF Receiver and Transmitter Module

1. Introduction

The RX470 433 MHz Superheterodyne RF Receiver and Transmitter Module is a versatile wireless communication solution designed for various remote control and data transmission applications. This module pair supports ASK (Amplitude Shift Keying) and OOK (On-Off Keying) modulation methods, offering high sensitivity and low power consumption. Its integrated design ensures reliable performance in a compact form factor, making it ideal for DIY projects, smart home systems, and security applications.

2. Features

• High Sensitivity: Receiver module boasts a high receiving sensitivity of -108dBm.
• Low Power Consumption: Designed for energy efficiency, with the transmitter module having a shutdown mode current of less than 1uA.
• High Dynamic Range: Receiver module offers a dynamic range greater than 60dB.
• Integrated Design: Utilizes a highly integrated chip with built-in low-noise amplifier, mixer, filter, and frequency synthesizer for optimized signal processing.
• ASK/OOK Modulation: Supports both Amplitude Shift Keying and On-Off Keying modulation methods.
• Multi-Module Operation: Excellent local oscillation radiation suppression allows multiple receiver modules to operate simultaneously without interference.
• Wide Operating Temperature: Functions reliably in harsh ambient temperatures ranging from -40°C to 85°C for the receiver and -45°C to 85°C for the transmitter.
• Broad Application Scope: Suitable for wireless power switches, smart sockets, remote control curtains, access control systems, electric vehicles, security systems, monitoring, hotel room control, and smart home products.

3. Specifications

3.1. General Specifications

3.2. Receiver Module (RX470)

3.3. Transmitter Module

4. Package Contents

The package includes the following components:

• 1 x RX470 Receiver Module
• 1 x Transmitter Module
• 2 x Antennas (typically coiled spring antennas)

5. Setup and Installation

This section provides detailed instructions for connecting and setting up your RX470 RF modules. Ensure all connections are secure and correct before applying power.

5.1. Pin Functions and Dimensions

Refer to the diagrams below for pin identification and module dimensions.

RX470 Receiver Module Pin Functions:

• ANT: Antenna pin. Connect the supplied 433MHz antenna here.
• VCC: Power input pin (2.2V-5.0V).
• DO (Data Output): Data output pin. This pin provides the demodulated data signal.
• GND: Power ground pin.

Transmitter Module Pin Functions:

• +: Power input pin (VCC, 2.0V-3.6V).
• -: Power ground pin (GND).
• DAT: Data input pin. Connect your digital data signal here.
• EN: Enable pin (optional, typically tied high for continuous operation or connected to a microcontroller for power control).

5.2. Antenna Connection

Connect the provided coiled spring antennas to the 'ANT' pin on the receiver module and the designated antenna pad on the transmitter module (if applicable, some transmitters have an integrated antenna or a small pad for soldering). For optimal performance, ensure the antenna is properly extended and not obstructed by metal objects.

5.3. Basic Wiring Example (Conceptual)

To integrate these modules into a system (e.g., with an Arduino or other microcontroller), follow these general steps:

1. Power Supply: Connect VCC and GND of both modules to their respective power sources, ensuring the voltage is within the specified range for each module.
2. Data Connection:
   • For the Transmitter: Connect the digital data output from your microcontroller to the 'DAT' pin of the transmitter module.
   • For the Receiver: Connect the 'DO' pin of the receiver module to a digital input pin on your microcontroller.
3. Antenna: Attach the antennas to both modules.

Programming will be required on your microcontroller to encode data for transmission and decode received data. Libraries for ASK/OOK communication are commonly available for popular platforms like Arduino.

6. Operating Instructions

The RX470 modules operate by transmitting and receiving digital data using 433.92 MHz radio frequency. The operation typically involves:

1. Data Encoding (Transmitter): Your microcontroller generates a digital signal (e.g., ON/OFF pulses) representing the data to be sent. This signal is fed into the transmitter's 'DAT' pin.
2. RF Transmission: The transmitter module converts the digital signal into a 433.92 MHz radio wave and broadcasts it.
3. RF Reception: The receiver module picks up the 433.92 MHz radio wave.
4. Data Decoding (Receiver): The receiver module demodulates the radio wave back into a digital signal, which is then outputted via its 'DO' pin to your microcontroller for interpretation.

For reliable communication, ensure that both the transmitter and receiver are configured to use the same modulation scheme (ASK/OOK) and data protocol. Many users employ encoding ICs (like PT2262/PT2272) or microcontroller libraries (like RadioHead for Arduino) to handle the data encoding and decoding process.

7. Maintenance

These modules are designed for durability and require minimal maintenance. Follow these guidelines to ensure longevity:

• Keep Dry: Avoid exposure to moisture or liquids, which can damage electronic components.
• Cleanliness: Keep the modules free from dust and debris. Use a soft, dry brush or compressed air for cleaning if necessary.
• Temperature Control: Operate within the specified temperature ranges (-40°C to 85°C for receiver, -45°C to 85°C for transmitter) to prevent overheating or cold damage.
• Secure Connections: Periodically check all wiring and antenna connections to ensure they are firm and free from corrosion.
• Handle with Care: Avoid dropping or subjecting the modules to strong impacts.

8. Troubleshooting

If you encounter issues with your RX470 modules, consider the following troubleshooting steps:

• No Signal Reception:
  • Verify power connections (VCC and GND) for both modules are correct and within specified voltage ranges.
  • Ensure antennas are properly connected and not damaged.
  • Check the distance between transmitter and receiver; excessive distance or obstructions can reduce range.
  • Confirm that the transmitter is actually sending data (e.g., using an oscilloscope on the data input pin).
  • Check for strong local interference at 433 MHz.
• Erratic Data:
  • Ensure proper data encoding/decoding is implemented in your microcontroller code.
  • Add decoupling capacitors (e.g., 0.1uF) close to the VCC pin of both modules to stabilize power.
  • Check for noise on the power supply lines.
  • Ensure the data rate is within the module's capabilities (up to 20Kbps).
• Module Not Powering On:
  • Double-check power supply voltage and polarity.
  • Inspect for any visible damage to the module.

9. User Tips

• Antenna Length: For optimal 433 MHz performance, the antenna length should ideally be a quarter-wavelength (approximately 17.3 cm for a straight wire antenna). The provided coiled antennas are designed to achieve this electrical length in a compact form.
• Power Supply Filtering: To minimize noise and improve signal integrity, consider adding a small capacitor (e.g., 100nF ceramic) and a larger electrolytic capacitor (e.g., 10uF) in parallel across the VCC and GND pins of both modules, placed as close to the module as possible.
• Data Encoding: Simple ON/OFF keying can be susceptible to noise. For more robust communication, use a reliable encoding scheme like Manchester encoding or dedicated RF data encoder/decoder ICs.
• Line of Sight: RF modules perform best with a clear line of sight between the transmitter and receiver. Walls, metal objects, and other electronic devices can significantly reduce range and signal quality.

10. Warranty and Support

This product is typically covered by a standard manufacturer's warranty against defects in materials and workmanship. For specific warranty details, please refer to the seller's policy at the time of purchase. For technical support, troubleshooting assistance, or inquiries regarding product functionality, please contact the vendor or manufacturer directly.