The **D8M-R1** is a high-precision digital pressure sensor manufactured by **Omron**. It is specifically designed for sensing low differential pressure in applications such as HVAC systems, medical equipment, and industrial leak detection. --- ### 1. Core Technical Specifications The D8M-R1 translates physical gas pressure into an electrical signal through an integrated micro-electro-mechanical system (MEMS) chip. | Feature | Specification | | :--- | :--- | | **Pressure Range** | 0 to 196.1 Pa (0 to 20 mmH2O) | | **Supply Voltage** | 4.75 to 5.25 VDC | | **Output Type** | Analog Voltage (1 to 5 VDC) | | **Current Consumption** | 10 mA max | | **Accuracy** | ±3% RD (Full Scale) | | **Operating Gas** | Air (non-corrosive) | --- ### 2. Key Electronic Components & Internal Architecture The device is a "solid-state" sensor, meaning it has no moving mechanical parts, which ensures long-term reliability. * **MEMS Capacitive/Piezoresistive Element:** The heart of the sensor is a silicon-machined diaphragm. When air pressure is applied, the diaphragm deflects, changing the electrical resistance or capacitance. * **ASIC (Application-Specific Integrated Circuit):** The raw signal from the MEMS element is extremely small. The internal ASIC performs: * **Amplification:** Boosting the signal to a usable 1-5V range. * **Temperature Compensation:** Correcting for drift caused by ambient temperature changes. * **Linearization:** Ensuring the output voltage is directly proportional to the pressure input. * **Built-in Noise Filter:** Helps reduce electromagnetic interference (EMI) from surrounding industrial machinery. --- ### 3. Connection Pinout The D8M-R1 typically utilizes a 3-pin connector configuration: 1. **Vcc:** Power Supply (5V). 2. **Vout:** Analog Output signal. 3. **GND:** Ground. --- ### 4. Implementation Example (Arduino/Microcontroller) To read the D8M-R1, you connect the output pin to an Analog-to-Digital Converter (ADC). ```cpp // Basic Arduino snippet for D8M-R1 int sensorPin = A0; float sensorValue = 0; float pressurePa = 0; void setup() { Serial.begin(9600); } void loop() { sensorValue = analogRead(sensorPin); // Map 1V-5V (approx 204-1023 on ADC) to 0-196.1 Pa pressurePa = (sensorValue - 204.6) * (196.1 / 818.4); Serial.print("Pressure: "); Serial.print(pressurePa); Serial.println(" Pa"); delay(500); } ``` ---