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TM1637 Readme

Table of contents

Overview

  • Display Name: TM1637
  • Author: Gavin Lyons.
  • Description: A Raspberry pi library to display data on TM1637 seven segment modules.

Hardware

Connections to RPI:

  1. GPIO = CLK = Clock
  2. GPIO = DIO = Data input / output
  3. VCC 3.3V (or 5V see Note)
  4. GND

NOTE : If VCC is set to 5V, level shift GPIO to 3.3V or damage could result.

This library is tested on one variant of the TM1637 (model 4) which has 4 digits with centred semi-colon , the library should work with other models (six digit, decimal points, etc) but is untested.

Model 4:

model4

Software

There is one example file. A table in file 'tm163X_font_data_RDL.cpp' provides ASCII to Seven Segment data. . gfedcba (seven segments ) In the gfedcba representation, a byte value of 0x06 would turn on segments "c" and "b", which would display a "1". https://en.wikipedia.org/wiki/Seven-segment_display

GPIO_CHIP_DEVICE

To get the number for GPIO_CHIP_DEVICE parameter you can check ls /dev/gpiochip* At time of testing it was found that Raspberry pi 5 = 4 and raspberry pi 3 = zero But now it look like both are zero after software update, although 4 should still work for RPi5 if a symlink is in /dev/ folder.

Comms delay

The Serial Communications delay used is set by default to 75 uS user can change this in constructor parameters.