Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Red Shipping:1 day the D24V10F5 version outputs 5

the D24V10F5 version outputs 5 V

green and blue OLEDs

the heating time should be within 3 seconds to prevent overheating deformation of the plastic parts in the engine

24LC256 is a 32K x 8(256Kbit) Serial Electrically Erasable Programmable Read - Only Memory

which could be a good partner for your tank-like robots

Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Red Shipping:1 day the D24V10F5 version outputs 5What's better than a single LED? Lots of LEDs! A fun way to make a numeric display is to use a 4 digit 7 segment display . LED matrices like these are 'multiplexed' so to control all the seven segment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit we feel your pain! After all, wouldn't it