A MicroPython library for quad 7-segment LED display modules using the TM1637 LED driver.
For example, the Grove - 4 Digit Display module
Copy the file to your device, using ampy, webrepl or compiling and deploying. eg.
$ ampy put tm1637.py
Basic usage
import tm1637
from machine import Pin
tm = tm1637.TM1637(clk=Pin(5), dio=Pin(4))
# all LEDS on "88:88"
tm.write([127, 255, 127, 127])
# all LEDS off
tm.write([0, 0, 0, 0])
# show "0123"
tm.write([63, 6, 91, 79])
# show "COOL"
tm.write([0b00111001, 0b00111111, 0b00111111, 0b00111000])
# show "HELP"
tm.show('help')
# display "dEAd", "bEEF"
tm.hex(0xdead)
tm.hex(0xbeef)
# show "12:59"
tm.numbers(12, 59)
# show "-123"
tm.number(-123)
tm.integer(-123)
# show "-7.34"
tm.float(-7.34)
# show temperature '24*C'
tm.temperature(24)For more detailed examples, see tm1637_test.py
They are called 7-segment displays as there are 7 LEDs for each digit (segment). One byte (7 lower bits) for each segment. The 8th bit (MSB) is for the colon and only on the 2nd segment.
A
---
F | | B *
-G- H (on 2nd segment)
E | | C *
---
D
HGFEDCBA
0b01101101 = 0x6D = 109 = show "5"
| Display | Bin | Hex | Dec |
|---|---|---|---|
| 0 | 0b00111111 | 0x3F | 63 |
| 1 | 0b00000110 | 0x06 | 6 |
| 2 | 0b01011011 | 0x5B | 91 |
| 3 | 0b01001111 | 0x4F | 79 |
| 4 | 0b01100110 | 0x66 | 102 |
| 5 | 0b01101101 | 0x6D | 109 |
| 6 | 0b01111101 | 0x7D | 125 |
| 7 | 0b00000111 | 0x07 | 7 |
| 8 | 0b01111111 | 0x7F | 127 |
| 9 | 0b01101111 | 0x6F | 111 |
| A | 0b01110111 | 0x77 | 119 |
| b | 0b01111100 | 0x7C | 124 |
| C | 0b00111001 | 0x39 | 57 |
| d | 0b01011110 | 0x5E | 94 |
| E | 0b01111001 | 0x79 | 121 |
| F | 0b01110001 | 0x71 | 113 |
| G | 0b00111101 | 0x3D | 61 |
| H | 0b01110110 | 0x76 | 118 |
| I | 0b00000110 | 0x06 | 6 |
| J | 0b00011110 | 0x1E | 30 |
| K | 0b01110110 | 0x76 | 118 |
| L | 0b00111000 | 0x38 | 56 |
| M | 0b01010101 | 0x55 | 85 |
| n | 0b01010100 | 0x54 | 84 |
| O | 0b00111111 | 0x3F | 63 |
| P | 0b01110011 | 0x73 | 115 |
| q | 0b01100111 | 0x67 | 103 |
| r | 0b01010000 | 0x50 | 80 |
| S | 0b01101101 | 0x6D | 109 |
| t | 0b01111000 | 0x78 | 120 |
| U | 0b00111110 | 0x3E | 62 |
| v | 0b00011100 | 0x1C | 28 |
| W | 0b00101010 | 0x2A | 42 |
| X | 0b01110110 | 0x76 | 118 |
| y | 0b01101110 | 0x6E | 110 |
| Z | 0b01011011 | 0x5B | 91 |
| blank | 0b00000000 | 0x00 | 0 |
| - | 0b01000000 | 0x40 | 64 |
| * | 0b01100011 | 0x63 | 99 |
Get or set brightness.
brightness(val=None)Write one or more segments at a given offset.
write(segments, pos=0)Convert a single hex digit (0x00-0x0f) to a segment.
encode_digit(digit)Convert a string to a list of segments.
encode_string(string)Convert a single character to a segment.
encode_char(char)Display a number in hexadecimal format 0000 through FFFF.
hex(val)Display a number -999 through 9999, right aligned.
number(num)Display 2 independent numbers on either side of the (optional) colon, with leading zeros.
numbers(num1, num2, colon=True)Display an integer -999 through 9999, right aligned (alternative method to "number").
integer(num)Display a floating point number -9.99 through 99.99, right aligned always with 2 decimal digits.
float(num)Display a temperature -9 through 99 followed by degrees C.
temperature(num)Show a string on the display. Shorthand for write(encode_string()). Limited to first 4 characters.
show(string, colon=False)Display a string on the display, scrolling from the right to left, speed adjustable. String starts off-screen and scrolls until off-screen at 4 FPS by default.
scroll(string, delay=250)- WeMos D1 Mini $4.00 USD
- Grove 4 Digit Display $5.90 USD
- Grove Male Jumper Cable $2.90 USD
| WeMos D1 Mini | 4 Digit Display |
|---|---|
| D1 (GPIO5) | CLK |
| D2 (GPIO4) | DIO |
| 3V3 (or 5V) | VCC |
| G | GND |
- WeMos D1 Mini
- micropython.org
- TM1637 datasheet
- Titan Micro TM1637 product page
- Nokia 5110 version
- BBC micro:bit version
- Adafruit Ampy
- micropython-tm1637 on pypi
Licensed under the MIT License.