TM1637 (7-segment display)

Kaluma library for 7-segment LED Display

Wiring

Here is a wiring example.

Install

npm install https://github.com/niklauslee/tm1637

Usage

const {TM1637} = require('tm1637');
const tm1637 = new TM1637(0, 1); // CLK=0, DIO=1

// Show "03:15"
tm1637.setDigit(0, TM1637.DIGIT[0]); // 0
tm1637.setDigit(1, TM1637.DIGIT[3] | TM1637.SEG_X); // 3:
tm1637.setDigit(2, TM1637.DIGIT[1]); // 1
tm1637.setDigit(3, TM1637.DIGIT[5]); // 5
delay(1000);

// Change brightness (0 ~ 7)
for (i = 0; i <= 7; i++) {
  tm1637.setBrightness(i);
  delay(500);
}
delay(1000);

// Display on and off (blinking)
for (i = 0; i < 10; i++) {
  tm1637.off();
  delay(100);
  tm1637.on();
  delay(100);
}
delay(1000);

// Show number from 0 to 500
for (i = 0; i <= 500; i++) {
  tm1637.display(i);
}
delay(1000);

// Show "done"
tm1637.setDigit(0, TM1637.SEG_B | TM1637.SEG_C | TM1637.SEG_D | TM1637.SEG_E | TM1637.SEG_G); // d
tm1637.setDigit(1, TM1637.SEG_C | TM1637.SEG_D | TM1637.SEG_E | TM1637.SEG_G); // o
tm1637.setDigit(2, TM1637.SEG_C | TM1637.SEG_E | TM1637.SEG_G); // n
tm1637.setDigit(3, TM1637.SEG_A | TM1637.SEG_B | TM1637.SEG_D | TM1637.SEG_E | TM1637.SEG_F | TM1637.SEG_G); // e

API

Class: TM1637

A class encapulating TM1637 driver.

new TM1637(clkPin, dioPin[, length[, brightness]])

Create an instance of TM1637 class.

• clkPin <number> Pin number for CLK.
• dioPin <number> Pin number for DIO.
• length <number> Number of digits. Default: 4.
• brightness <number> Level of brightness (0~7). Default: 7.

tm1637.clear()

Clear all digits.

tm1637.on()

Turn on the display.

tm1637.off()

Turn off the display.

tm1637.setBrightness(brightness)

Set the brightness of the display.

• brightness <number> Level of brightness (0~7).

tm1637.setDigit(pos, data)

Set a digit with the data.

• pos <number> Position to set digit data.
• data <number> 7-segment data for the digit.

  7-SEGMENT

      A
     ---
  F |   | B
     -G-
  E |   | C
     ---  . X
      D

tm1637.display(value)

Show the number value on the display.

• value <number> A number to display.

TM1637.SEG_A

Bit for the segment A. (0x01)

• <number>

TM1637.SEG_B

Bit for the segment B. (0x02)

• <number>

TM1637.SEG_C

Bit for the segment C. (0x04)

• <number>

TM1637.SEG_D

Bit for the segment D. (0x08)

• <number>

TM1637.SEG_E

Bit for the segment E. (0x10)

• <number>

TM1637.SEG_F

Bit for the segment F. (0x20)

• <number>

TM1637.SEG_G

Bit for the segment G. (0x40)

• <number>

TM1637.SEG_X

Bit for the segment X (Dot or Colon). (0x80)

• <number>

TM1637.DIGIT

An array of 7-segment data for number digits from 0 to 9.

• Array<number>