Example 25: Laser Sensor

Experiment Overview

A laser transmitter module controls the laser on/off via GPIO high/low level, suitable for laser beam interruption detection, laser pointers, and other applications. Paired with a photosensitive receiver, it can implement laser beam alarm systems.

Hardware Wiring

Board Label	GPIO Pin	Connected Device
LASER	GPIO15	Laser transmitter module (HIGH = emit)

Laser modules are typically low-power Class IIIA (<5mW), powered at 3.3V or 5V.

JSON Configuration Example

{
  "peripherals": [
    {
      "id": "laser_01",
      "name": "Laser Module",
      "type": 12,
      "enabled": false,
      "pins": [15],
      "params": { "initialState": 0 }
    }
  ]
}

Peripheral Execution Linkage

Scenario: Remote Laser Control (Platform Trigger)

Feature: Control laser on/off via cloud platform commands

Web UI Configuration Steps

Step 1: Create Rule

1. Click Peripheral Execution in the left menu
2. Click New Rule button
3. Fill in basic configuration:
   • Rule Name: Remote Laser Control
   • Report Data: ✅ Enabled
   • Enable: ✅ Enabled

Step 2: Configure Trigger

1. Click Add Trigger button

2. Fill in trigger configuration:

   Field	Value	Description
   Trigger Type	Select Platform Trigger	Receive cloud platform commands
   Operator	Select Set Mode	Received data as action parameter

Step 3: Configure Action

1. Click Add Action button

2. Fill in:

   • Action Type: Select HIGH or LOW
   • Target Peripheral: Select laser_01

3. Click Save button

Test Method:

Send via cloud platform:

• 1 or HIGH → Laser ON
• 0 or LOW → Laser OFF

Notes

1. Safety: Direct laser exposure to eyes is harmful; avoid looking directly at the beam during operation
2. Power Consumption: Laser module operating current is ~30mA, can be driven directly by GPIO (or via transistor)
3. Heat Dissipation: Consider heat dissipation for prolonged continuous operation
4. Beam Applications: Pair with a photoresistor (GPIO_ANALOG_INPUT) for beam interruption detection