The **MP1102-1-RX** is an electronic component primarily associated with **RF (Radio Frequency) communication systems**, specifically acting as a receiver module. It is commonly used in low-power wireless data transmission, remote control systems, and security applications. --- ### 1. Key Specifications The following table summarizes the typical technical parameters for this class of receiver module: | Feature | Specification | | :--- | :--- | | **Operating Frequency** | 315 MHz or 433.92 MHz (Standard ISM bands) | | **Operating Voltage** | 3.3V to 5.5V DC | | **Modulation Type** | ASK (Amplitude Shift Keying) / OOK (On-Off Keying) | | **Sensitivity** | -105 dBm to -110 dBm | | **Data Rate** | Up to 4.8 kbps | | **Interface** | TTL / CMOS Logic compatible | --- ### 2. Main Components and Circuitry The "RX" suffix indicates this is the **Receiver** unit. Its internal architecture usually consists of the following electronic parts: 1. **RF Front End:** Includes a Saw Filter or LC tuned circuit to filter out interference and focus on the target frequency (e.g., 433MHz). 2. **LNA (Low Noise Amplifier):** Boosts the weak signal received by the antenna without adding significant noise. 3. **Local Oscillator (LO):** Usually crystal-stabilized to ensure frequency accuracy and prevent drifting. 4. **Demodulator:** Converts the RF envelope back into a digital high/low (1/0) square wave signal. 5. **Data Slicing Circuit:** A comparator circuit that cleans up the signal to provide a clean TTL output for a microcontroller (like Arduino or PIC). --- ### 3. Pin Configuration Most modules in this series follow a standard 4-pin or 5-pin layout: * **VCC:** Power Supply (Positive). * **GND:** Ground. * **DATA:** The output pin where the demodulated digital signal is sent to the MCU. * **ANT:** A solder pad for a 1/4 wave length wire antenna (approx. 17cm for 433MHz). --- ### 4. Application Logic To use the MP1102-1-RX, it must be paired with a matching transmitter (TX). The raw data output is often "noisy" when no signal is present due to the high sensitivity of the receiver. ```cpp // Example: Basic pseudo-code for reading the RX pin int rxPin = 2; // Data pin connected to digital 2 void setup() { pinMode(rxPin, INPUT); Serial.begin(9600); } void loop() { int data = digitalRead(rxPin); // Use a library like VirtualWire or RadioHead // to decode the pulse widths into actual bytes. } ``` ---