The **JZ-R2** is a widely used high-frequency wireless receiver module, typically paired with the JZ-T2 transmitter. It operates on the OOK (On-Off Keying) / ASK (Amplitude Shift Keying) modulation principle. Below is a breakdown of its electronic specifications, pinout configuration, and key components. --- ### 1. Technical Specifications The JZ-R2 is designed for low-power, short-range wireless communication, often used in remote control systems and DIY electronics like Arduino or Raspberry Pi projects. | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 3.3V to 5.5V DC | | **Operating Frequency** | 315MHz or 433.92MHz (Common variants) | | **Modulation Type** | ASK / OOK | | **Receiver Sensitivity** | -105 dBm | | **Current Consumption** | ~3.5mA to 5mA | | **Data Rate** | Up to 4.8 kbps | --- ### 2. Pinout Configuration The module typically features 4 pins, though some versions may have 5 (with redundant data pins). | Pin Name | Type | Description | | :--- | :--- | :--- | | **VCC** | Power | Positive supply (typically 5V for better range). | | **DATA** | Output | Digital data output to the microcontroller. | | **DATA** | Output | Redundant data pin (internally connected). | | **GND** | Ground | Negative power supply. | | **ANT** | Solder Pad | Connection point for an external 17.3cm wire antenna (for 433MHz). | --- ### 3. Key Electronic Components The architecture of the JZ-R2 is based on a **Super-Regenerative** circuit design. * **LC Oscillator:** A combination of an inductor (L) and a capacitor (C) tuned to the specific target frequency (e.g., 433MHz). * **Operational Amplifier (Op-Amp):** Usually an **LM358** or similar low-power dual op-amp. It acts as a comparator to square off the analog signal received from the LC circuit into a digital High/Low signal. * **Transistor Switch:** Used in the initial amplification stage to boost the weak RF signal captured by the antenna. * **Tuning Inductor:** A small copper coil that can be slightly adjusted (stretched or compressed) to fine-tune the frequency reception, though this is usually set at the factory. --- ### 4. Typical Application Circuit When connecting the JZ-R2 to a microcontroller, no complex external circuitry is required, but a decoupling capacitor is recommended to reduce noise. ```cpp // Example: Basic Arduino Read int dataPin = 2; // Connect JZ-R2 DATA to Pin 2 void setup() { pinMode(dataPin, INPUT); Serial.begin(9600); } void loop() { int signal = digitalRead(dataPin); // Process the binary signal (usually via RadioHead library) } ``` --- ### 5. Best Practices for Usage 1. **Antenna:** To achieve maximum range, solder a solid core wire of exactly **17.3 cm** (for 433MHz) to the ANT pad. 2. **Noise Shielding:** Super-regenerative receivers are sensitive to electrical noise. Keep the module away from motors or high-frequency switching power supplies. 3. **Voltage Stability:** While it works at 3.3V, providing a stable **5V** usually results in better sensitivity and range.