TM1638 - 8x 7-segment LED modules with 8x buttons

[mcauser]

I created a library for LED&KEY modules with 8x 7-segment decimal LED modules, 8x individual LEDs and 8x switches using the TM1638 LED driver.
https://github.com/mcauser/micropython-tm1638

Quite similar to my TM1637 and TM1640 drivers.



Press button, receive LED.

[mcauser]

I found a similar module, with 16x buttons and no individual LEDs at the top.
I'll add support once it arrives.

[RobH]

Your TM1638 driver works fine here, thanks.
Now I'm looking for a similar driver for a board with 16 7-segment digits with a TM1640 chip (no leds or buttons on these boards). I have written drivers for TM1638 and TM1640 displays in JAL (for Microchip PICs), but I'm rather a beginner with Micropython. So I might be able to modify the TM1638 driver to get where I'm looking for. That would probably be a good learning experience, but I expect it to become pretty time consuming for me. I would appreciate some help. Thanks in advance.
Regards, Rob.

[RobH]

Forgot to mention a typo in your first line: "TM1738"

[mcauser]

Have a look at my tm1640 driver:
https://github.com/mcauser/micropython-tm1640
It’s geared towards 8x8 led matrices as that’s the only device I have using that chip. You could use it to run 7segments. Each row in the matrix translates to a single digit 7segment module. Maybe add some convenience methods from my tm1637 driver.

The tm1640 is very similar to the tm1638 and tm1637. Just more outputs.
https://github.com/mcauser/micropython-tm1640
https://github.com/mcauser/micropython-tm1638
https://github.com/mcauser/micropython-tm1637

Which tm1640 board are you using?

[fos]

I found one of these displays available from banggood available for less than $5!

I have one on order. Thanks for the library.

MicroPython and its developers are amazing.

Thank you,
v/r
Jeff

[RobH]

Thank you for the hints.
I have 2 boards with 16 7-segment digits controlled bij a TM1640 for a log time, probably acquired via eBay. But I cannot find these back anymore. I found a msg on an Arduino forum with a picture. This is exactly the same as mine:
https://forum.arduino.cc/index.php?topic=81751.0
I think I can manage to build a driver with the material I have now.

[RobH]

I'm happy to inform you that I managed to build a Micropython library 'tm1640.py' for the ESP32 (and probably ESP8266 too) to control a 16-digits 7-segment display module. It is derived from Mike's tm1638.py and as far as controlling 7-segment display it has the same functionality. Major differences are mentioned in the header of the library. A sample for the ESP32 is provided.
See http://github.com/robhamerling/micropython-tm1640
Note: Moved library to Gitlab! https://gitlab.com/robhamerling/micropython-tm1640

[ptarjan]

I am using a tm1638 board with a Wemos D1 mini and I have a persistent (probably hardware) issue.

Whenever I plug in the Wemos D1 mini, I either don't get a REPL prompt or get garbled output instead.

If I start with the VCC and GND wires disconnected from the TM1638, plug the USB cable to my computer, connect to REPL, *then* connect VCC and GND, then there is no problem. (VCC is connected to 3V3 pin on the Wemos.)

Anyone else encounter this? Any idea is appreciated.

[Roberthh]

How do you connect the TM1638 board?