The **MP1112-H-RX** is an electronic component primarily associated with **Infrared (IR) Remote Control Receiver** modules. These devices are designed to receive infrared signals (typically from a handheld remote) and convert them into electrical pulses that a microcontroller (like Arduino or an MCU) can interpret. --- ## 1. Technical Specifications The "RX" suffix explicitly identifies this part as a **Receiver**. Below are the typical technical characteristics found in this series: | Parameter | Typical Value | | :--- | :--- | | **Operating Voltage** | 2.7V to 5.5V DC | | **Carrier Frequency** | 38 kHz (Standard for most remotes) | | **Reception Distance** | 10 – 15 Meters | | **Reception Angle** | ±45 Degrees | | **Output Level** | TTL/CMOS Compatible (Active Low) | | **Power Consumption** | Low (approx. 0.5mA to 1.5mA) | --- ## 2. Internal Block Diagram Components The MP1112-H-RX is not just a sensor; it is an Integrated Circuit (IC) that contains several sub-components: 1. **Photo Diode:** Captures the incoming infrared light. 2. **Preamplifier:** Boosts the weak electrical signal from the diode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for ambient light noise. 4. **Band Pass Filter (BPF):** Specifically tuned to 38kHz to filter out sunlight or fluorescent light interference. 5. **Demodulator:** Removes the 38kHz carrier wave to leave only the data pulses. --- ## 3. Pin Configuration The module typically features a 3-pin layout, making it easy to integrate into circuits: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **OUT** | Data Output (Connect to MCU Input) | | 2 | **GND** | Ground (0V) | | 3 | **VCC** | Power Supply (Typically 3.3V or 5V) | --- ## 4. Typical Application Circuit When using this part in a design, it is recommended to use a simple RC filter to ensure power stability. ```cpp // Example: Basic Arduino Connection Logic int receiverPin = 2; // Connected to OUT pin of MP1112-H-RX void setup() { pinMode(receiverPin, INPUT); Serial.begin(9600); } void loop() { int signal = digitalRead(receiverPin); if (signal == LOW) { // Signal detected (Active Low) Serial.println("IR Signal Received"); } } ``` --- ## 5. Key Features * **High Immunity:** Excellent protection against ambient light interference. * **Compact Design:** The "H" often denotes a horizontal mounting style or a specific small-form-factor housing. * **PCM Compatibility:** Works with common protocols like NEC, RC5, and Sony.