Comparing two TM1638 modules

 Some year ago i also ordered another TM1638, so now i have 2 different types of TM1638 modules this blog post to compare the modules.

Module	TM1638 Led	QTF_TM1628
Connection	PCB with Dupont connectors	PCB with dupont connectors
Post	https://blog.jeronimus.net/2017/07/tm1638-8-bit-digital-led-module-1.html	https://blog.jeronimus.net/2021/01/qyf-tm1638-test.html
Picture
LCD display	8	8
Led	8	0
Dupont Pin Arrangement (top-down)	VCC GND STB CLK DIO	GND DIO CLK STB VCC
Buttons	8	16
Buttons	8	16
Buttons	8	16

Both modules have 8 seven segment displays.
The big difference is that my first module has 8 leds and less (8) input keys, while my second module has 16 keys and no leds. As the 16 pins are arranged as 4*4 this module can be used as a Hex keypad. 
The Dupont pin arrangement on both PCBs is different.
Below schematic diagram of the modules as i did not put it in my previous posts. 

Diagrams and some other interesting info (in Italian) about these modules can be found at http://www.microcontroller.it/Tutorials/Elettronica/componenti/tm1638.htm

Keyboard with Leds for Arduino

4X4 Matrix Keyboard For Arduino Array Module 16 Key Push Buttons Tastatur Switch Keypad Panel 4*4 Tasten 8LEDs Accessory DIY Kit
This module is advertised for Arduino, however i had plans to use it for FPGA experiments.
Just when i did think i needed to build something like this on a board as there could be a big delay in delivery due to the current situation in the world i received it this AliExpress item in my mailbag.
Small where where included, i just needed to screw them in position.

I did nit yet test it, however it seems an interesting small and cheap module to add some buttons and led's to projects or for development.

• 16 keys in a 4*4 matrix
• 4 keys connected to ground and with 1k resistors to VCC
• 8 leds with 1k resistors and connected to VCC

KEY_A

KEY_B

(Photos taken with my phone, Schematic diagrams / circuits copied from AliExpress)

LED