TM1638 LED&KEY with I2C for fischertechnik
Description
These [cheap LED&KEY modules](https://handsontec.com/index.php/product/tm1638-7-segment-display-keypadled-module/) are all over ebay and aliexpress. The [TM1638 chip](https://duckduckgo.com/?q=TM1638+datasheet) uses a non-bus serial protocol. I made them into an I2C target (slave) device by adding an ATtiny85 which runs my [I2Cwrapper firmware](https://github.com/ftjuh/I2Cwrapper) with the TM1638liteI2C module enabled. It can be addressed from the controller (master) using the [TM1638liteI2C.h library](https://github.com/ftjuh/I2Cwrapper/blob/main/src/TM1638liteI2C.h) and these pin assignments: `const uint8_t strobePin = 1; const uint8_t clockPin = 4; const uint8_t dataPin = 3;`. You can use [this adapter](https://www.thingiverse.com/thing:5532026) to flash or update the ATtiny85 firmware. The case is meant for fischertechnik models, the six pin connector is compatible with other fischertechnik I2C hardware. Print the top part with support *only touching buildplate*, you don't want to have support under the button levers. [seo: fischertechnik fischertechnik fischertechnik fischertechnik fischertechnik fischertechnik fischertechnik fischertechnik fischertechnik fischertechnik]
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