TM1637 Seven-Segment Display

Overview

TM1637 is a 4-digit 7-segment display driver chip that communicates via a 2-wire serial interface (CLK + DIO). Suitable for displaying numbers, time, and simple text.

Supported Peripheral Types

Type	type Value	Description
SEVEN_SEGMENT_TM1637	47	TM1637 4-digit display

Hardware Wiring

TM1637 Pin	Connection	Description
VCC	3.3V / 5V	Power supply
GND	GND	Ground
CLK	GPIO (any)	Clock line
DIO	GPIO (any)	Data line

Configuration

Method 1: Web Interface Configuration (Recommended)

Before saving TM1637 configuration, verify CLK/DIO pins, digit count, and default brightness.

For TM1637 debugging, first display a fixed number to confirm CLK/DIO pins and brightness, then connect to sensor readings or peripheral execution actions.

Step 1: Navigate to Peripheral Management Page

1. Open a browser and navigate to the ESP32 IP address
2. After logging in, click Peripheral Configuration in the left menu

Step 2: Add TM1637 Seven-Segment Display Peripheral

1. Click the Add Peripheral button

2. Fill in the configuration:

   Field	Value	Description
   Peripheral ID	tm1637_1	Unique identifier
   Name	4-Digit Display	Display name
   Peripheral Type	Seven-Segment Display (type: 47)	TM1637 driver
   CLK Pin	18	Clock pin
   DIO Pin	19	Data pin
   Brightness	4	0-7 (0=dim, 7=brightest)

3. Click Save

Step 3: Verify Configuration

1. Find the newly added peripheral in the peripheral list
2. Click the Enable toggle
3. The display should show default content

💡 Tip: Recommend using 5V power supply for optimal brightness

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Method 2: JSON Configuration File Import

Add the following configuration to the peripherals array in data/config/peripherals.json:

{
  "id": "tm1637_1",
  "name": "4-Digit Display",
  "type": 47,
  "enabled": false,
  "pins": [18, 19],
  "params": {
    "brightness": 4
  }
}

Parameter Description

Parameter	Description	Range
brightness	Display brightness	0-7 (0=dim, 7=brightest)

pins[0] = CLK pin, pins[1] = DIO pin

Peripheral Execution Integration

Web Interface Configuration Steps

Create Display Rule

1. Click Peripheral Execution in the left menu
2. Click the Add Rule button
3. Configure trigger (e.g., timer trigger, 5-second interval)
4. Add actions:
   • Action 1: Read sensor data
     • Action Type: Sensor Read
     • Target Peripheral: dht1
   • Action 2: Display on seven-segment display
     • Action Type: Display Number
     • Target Peripheral: tm1637_1
     • Enable Use Received Value (display temperature value)
5. Click Save

💡 Tip: Can use "Display Number", "Display Text", or "Clear Screen" actions

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JSON Configuration Example

Display Number (ACTION_DISPLAY_NUMBER = 24)

{
  "targetPeriphId": "tm1637_1",
  "actionType": 24,
  "actionValue": "12.34",
  "useReceivedValue": false,
  "syncDelayMs": 0,
  "execMode": 0
}

Supported number formats:

• "1234" — Display 1234
• "12.34" — Display 12.34 (with decimal point)
• "12:34" — Display 12:34 (with colon, suitable for clock)

Display Text (ACTION_DISPLAY_TEXT = 25)

{
  "targetPeriphId": "tm1637_1",
  "actionType": 25,
  "actionValue": "PLAY",
  "useReceivedValue": false,
  "syncDelayMs": 0,
  "execMode": 0
}

Only some displayable characters are supported: 0-9, A-F, H, L, P, U, b, d, o, n, r, t, -

Clear Screen (ACTION_DISPLAY_CLEAR = 26)

{
  "targetPeriphId": "tm1637_1",
  "actionType": 26,
  "actionValue": "",
  "useReceivedValue": false,
  "syncDelayMs": 0,
  "execMode": 0
}

Display with Received Value

When useReceivedValue: true, the sensor data received at trigger time is displayed directly:

{
  "id": "exec_show_temp",
  "name": "Display Temperature on Seven-Segment",
  "enabled": false,
  "execMode": 0,
  "triggers": [
    {
      "triggerType": 1,
      "triggerPeriphId": "",
      "operatorType": 0,
      "compareValue": "",
      "timerMode": 0,
      "intervalSec": 5,
      "timePoint": "",
      "eventId": "",
      "pollResponseTimeout": 1000,
      "pollMaxRetries": 2,
      "pollInterPollDelay": 100
    }
  ],
  "actions": [
    {
      "targetPeriphId": "dht1",
      "actionType": 19,
      "actionValue": "",
      "useReceivedValue": false,
      "syncDelayMs": 0,
      "execMode": 0
    },
    {
      "targetPeriphId": "tm1637_1",
      "actionType": 24,
      "actionValue": "",
      "useReceivedValue": true,
      "syncDelayMs": 100,
      "execMode": 0
    }
  ],
  "protocolType": 0,
  "scriptContent": "",
  "reportAfterExec": false
}

Notes

1. Pin Order: In configuration, pins[0] is CLK, pins[1] is DIO; do not reverse
2. Character Limit: Only 4 digits displayed; numbers/text exceeding 4 digits will be truncated
3. Brightness Adjustment: 0-7 brightness levels adjustable via Web interface or configuration
4. Power Supply: Recommend 5V power supply for optimal brightness; 3.3V also works but dimmer
5. Refresh Rate: Display updates immediately when content changes; no need to worry about refresh rate