Using an Old Gotek LEDC68 (TM1651 based) 3-Digit LED Board
LEDC68 Front
LEDC68 Rear
Having recently, like many, upgraded my Gotek drive to use the FlashFloppy firmware, I then went on to do a few hardware mods - including replacing the stock 3-digit LED screen (LEDC68) with a superior OLED screen.
Not wanting to just throw the LEDC68 away, I decided to see if I could do anything with it using my trusty Arduino Mega 2560 R3.
Here is the result... a small library of functions and some demo code to show it in action!
- TM1651.ino: Demo sketch showing the library functions at work.
- TM1651.h: Header file for the function library.
- TM1651.cpp: The library of TM1651 functions.
Now to be fair, there is not a lot that you can do with a 3-digit LED display, but it was fun to work it all out.
The LEDC68 uses a TM1651 chip to address the digits and drive the segments. The TM1651 uses a 2-wire serial interface (clock and data), but despite appearances, it is not I2C.
LEDC68 Circuit
The TM1651 datasheet is also in this archive: TM1651_V1.1_EN.pdf
Captured Serial Output
Display brightness and digit test.
Demo 1: 8-bit hex count up.
Demo 2: 12-bit hex count up.
Demo 3: 999 decimal count up.
Demo 4: 999 decimal count down.
Demo 5: A 5 minute delay() timer: 301132ms
Demo 6: A 10 minute millis() timer & flashing decimal point: 600002ms
Demo 1: 8-bit hex count up.
...etc.
It is interesting to see how quickly the simple 5 minute (delay() function) timer drifts!
Built on work by Derek Cooper. Thank you for the jump start!
Enjoy!