Example 2: LED Blink

Experiment Overview

Achieve LED blinking by periodically toggling GPIO output state. In FastBee, you can use the peripheral execution timer trigger combined with GPIO toggle actions to achieve this without writing code.

Hardware Wiring

Board Label	GPIO Pin	Connected Device
D1	GPIO15	LED (active low)

Use any LED, this example uses D1 (GPIO15).

JSON Configuration Example

{
  "peripherals": [
    {
      "id": "led_blink",
      "name": "LED Blink",
      "type": 12,
      "enabled": false,
      "pins": [15],
      "params": {
        "initialState": 1
      }
    }
  ]
}

Peripheral Execution Linkage

Scenario: Timed LED Blink (Timer Trigger)

Function: Automatically toggle LED state every 500ms for blinking effect

Web Interface Configuration Steps

Step 1: Create Rule

1. Click left menu Peripheral Configuration → Switch to Peripheral Execution Management tab
2. Click New Rule button
3. Fill in basic configuration:
   • Rule Name: LED Periodic Blink
   • Report Data: ❌ Disable
   • Enabled: ✅ Enable

Step 2: Configure Trigger

1. Click Add Trigger button

2. Fill in trigger configuration:

   Field	Value	Description
   Trigger Type	Select Timer Trigger	Execute at time intervals
   Timer Mode	Select Interval Timer	Execute every X seconds
   Interval Seconds	0.5	Execute every 0.5 seconds (500ms)

Step 3: Configure Action

1. Click Add Action button

2. Fill in action configuration:

   Field	Value	Description
   Action Type	Select Toggle Level	Flip GPIO state
   Target Peripheral	Select led_blink	LED to control

3. Click Save button

Execution Flow:

Every 500ms
  ↓
Read led_blink current state
  ↓
Invert: HIGH→LOW or LOW→HIGH
  ↓
LED on/off toggled

Adjustable Blink Frequency

Modify Interval Seconds to change blink speed:

Interval Value	Blink Effect	Use Case
0.1	Fast blink (100ms)	Emergency alarm
0.5	Normal blink (500ms)	Status indication
1.0	Slow blink (1 second)	Low power hint

Notes

1. Timer Precision: ESP32 timer precision is ~1ms, intervals below 10ms may be unstable
2. Multi-LED Blink: You can add multiple gpio_toggle actions in the same rule
3. Stop Blinking: Disable the peripheral execution rule to stop
4. gpio_toggle: Automatically reads current pin state and inverts it, no need to track state