How to Use DSI8820 Laser Receiver Module [Bill Ludwig]: Examples, Pinouts, and Specs

The DSI8820 is a laser receiver module designed for high-speed data transmission and communication applications. It is capable of detecting laser signals with high sensitivity, making it an essential component in optical communication systems. The module is widely used in applications such as fiber-optic communication, laser-based distance measurement, and high-speed data links. Its compact design and reliable performance make it suitable for both industrial and research purposes.

• Fiber-optic communication systems
• Laser-based distance measurement and ranging
• High-speed optical data transmission
• Optical sensing and detection systems
• Research and development in photonics

• Manufacturer Part ID: DSI8820
• Operating Voltage: 3.3V to 5V DC
• Current Consumption: ≤ 20mA
• Wavelength Sensitivity: 800nm to 1550nm
• Detection Range: Up to 10 meters (depending on laser power)
• Output Signal: Digital (High/Low)
• Response Time: ≤ 10ns
• Operating Temperature: -20°C to 70°C
• Dimensions: 25mm x 15mm x 5mm

The DSI8820 module has a 4-pin interface. Below is the pinout description:

1. Power Supply: Connect the VCC pin to a 3.3V or 5V DC power source and the GND pin to the ground of your circuit.
2. Enable the Module: Ensure the EN pin is set to HIGH to activate the module. If this pin is LOW, the module will remain disabled.
3. Connect the Output: The OUT pin provides a digital signal. When a laser signal is detected, the output will go HIGH; otherwise, it will remain LOW.
4. Laser Alignment: Ensure the laser source is aligned with the receiver module for optimal detection. The module is sensitive to wavelengths between 800nm and 1550nm.
5. Signal Processing: Use the digital output signal for further processing in your circuit or microcontroller.

• Power Supply: Ensure a stable power supply to avoid noise or erratic behavior.
• Laser Safety: Use appropriate safety measures when working with lasers to prevent eye damage.
• Ambient Light: Minimize ambient light interference for accurate signal detection.
• Heat Management: Operate the module within the specified temperature range to avoid damage.

Below is an example of how to connect and use the DSI8820 with an Arduino UNO:

• Connect VCC to the 5V pin on the Arduino.
• Connect GND to the GND pin on the Arduino.
• Connect OUT to digital pin 2 on the Arduino.
• Connect EN to digital pin 3 on the Arduino.

// DSI8820 Laser Receiver Module Example Code
// Connect OUT to pin 2 and EN to pin 3 on the Arduino UNO

const int laserOutPin = 2; // Pin connected to the OUT pin of DSI8820
const int enablePin = 3;   // Pin connected to the EN pin of DSI8820

void setup() {
  pinMode(laserOutPin, INPUT);  // Set OUT pin as input
  pinMode(enablePin, OUTPUT);  // Set EN pin as output

  digitalWrite(enablePin, HIGH); // Enable the DSI8820 module
  Serial.begin(9600);           // Initialize serial communication
}

void loop() {
  int laserSignal = digitalRead(laserOutPin); // Read the laser signal

  if (laserSignal == HIGH) {
    Serial.println("Laser signal detected!"); // Print message if signal is detected
  } else {
    Serial.println("No laser signal detected."); // Print message if no signal
  }

  delay(500); // Wait for 500ms before the next reading
}

1. No Output Signal Detected:

   • Cause: The EN pin is not set to HIGH.
   • Solution: Ensure the EN pin is connected to a HIGH signal to enable the module.

2. Erratic Output Signal:

   • Cause: Unstable power supply or excessive ambient light interference.
   • Solution: Use a regulated power supply and minimize ambient light exposure.

3. Short Detection Range:

   • Cause: Misalignment of the laser source or low laser power.
   • Solution: Align the laser source properly and ensure sufficient laser power.

4. Module Overheating:

   • Cause: Operating outside the specified temperature range.
   • Solution: Ensure the module is used within the -20°C to 70°C range.

Q1: Can the DSI8820 detect infrared lasers?
A1: Yes, the DSI8820 is sensitive to wavelengths between 800nm and 1550nm, which includes infrared lasers.

Q2: What is the maximum detection range of the module?
A2: The detection range is up to 10 meters, depending on the power and alignment of the laser source.

Q3: Can I use the DSI8820 with a 3.3V microcontroller?
A3: Yes, the module operates with a voltage range of 3.3V to 5V, making it compatible with 3.3V microcontrollers.

Q4: Is the module suitable for outdoor use?
A4: The module can be used outdoors, but care should be taken to minimize interference from sunlight or other strong light sources.

Q5: What is the response time of the DSI8820?
A5: The module has a fast response time of ≤ 10ns, making it suitable for high-speed applications.