Example 3: LED Flowing Light

Experiment Overview

Use multiple GPIO output pins to sequentially turn on and off LEDs via script actions, creating a running light effect. FastBee supports complex GPIO timing control through rule scripts.

Hardware Wiring

Board Label	GPIO Pin	Connected Device
D1	GPIO15	LED1 (active low)
D2	GPIO2	LED2 (active low)
D3	GPIO0	LED3 (active low)
D4	GPIO4	LED4 (active low)

JSON Configuration Example

{
  "peripherals": [
    {
      "id": "flow_led1",
      "name": "Flow LED-1",
      "type": 12,
      "enabled": false,
      "pins": [15],
      "params": { "initialState": 1 }
    },
    {
      "id": "flow_led2",
      "name": "Flow LED-2",
      "type": 12,
      "enabled": false,
      "pins": [2],
      "params": { "initialState": 1 }
    },
    {
      "id": "flow_led3",
      "name": "Flow LED-3",
      "type": 12,
      "enabled": false,
      "pins": [0],
      "params": { "initialState": 1 }
    },
    {
      "id": "flow_led4",
      "name": "Flow LED-4",
      "type": 12,
      "enabled": false,
      "pins": [4],
      "params": { "initialState": 1 }
    }
  ]
}

Peripheral Execution Linkage

Scenario: Timed Running Light (Timer Trigger + Command Script)

Function: Light up the next LED every 200ms to create a flowing 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 Running Light
   • 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	0.2	Execute every 0.2 seconds (200ms)

Step 3: Configure Action

1. Click Add Action button

2. Fill in action configuration:

   Field	Value	Description
   Action Type	Select Command Script	Execute PERIPH/DELAY sequence
   Script Content	See code block below	Running light logic

Script Content:

PERIPH flow_led1 LOW
DELAY 300
PERIPH flow_led1 HIGH
PERIPH flow_led2 LOW
DELAY 300
PERIPH flow_led2 HIGH
PERIPH flow_led3 LOW
DELAY 300
PERIPH flow_led3 HIGH
PERIPH flow_led4 LOW
DELAY 300
PERIPH flow_led4 HIGH

3. Click Save button

Execution Flow:

Triggered every 200ms
  ↓
Turn on LED1 (LOW)
  ↓
Delay 300ms
  ↓
Turn off LED1 (HIGH)
  ↓
Turn on LED2 → Delay → Turn off
  ↓
Turn on LED3 → Delay → Turn off
  ↓
Turn on LED4 → Delay → Turn off
  ↓
Wait for next 200ms cycle

Script Reference

Command	Description	Example
PERIPH	Control peripheral level	PERIPH flow_led1 LOW
DELAY	Delay (milliseconds)	DELAY 300

💡 Tip: You can also use JavaScript scripts for more complex running light logic (e.g., back-and-forth, random lighting)

Notes

1. Script Length Limit: Single-line script recommended not to exceed 256 characters
2. Execution Interval: 200ms provides good visual effect, adjustable as needed
3. GPIO0 Constraint: Do not pull GPIO0 LOW during boot, otherwise it enters download mode
4. Extension: Modify the script to achieve back-and-forth running, random lighting effects