Seven segment LED display module with TM1637 4-wire interface
|DIO||Data input *|
* The DIO pin is also used for acknowledging the data received from the microcontroller, by pulling it down at a specific clock cycle.
|color||The color of the segment LEDs||"red"|
Using the 7-segment display
This variant of the seven segment display uses the TM1637 chip. You'll only need 2 microcontroller pins to communicate with it.
The TM1637 communication protocol is non-standard. It resembles the I2C protocol, but it is simpler and incompatible with I2C. Luckily, you can use a library and not worry about the implementation of the protocol. Here are some TM1637 libraries you can use on Arduino: RT1637_RT(https://github.com/RobTillaart/TM1637_RT), Grove 4-Digit Display.