UART
3 pages across tutorials, modules, pinouts and guides.
beginnerModule
58mm Thermal Printers: the receipt kit, the label kit and the USB-C base board
Two thermal printer kits that share one Type-C TTL base board. The 9 V a USB port will not give you, which header your microcontroller belongs on, the baud rate printed on each unit, and the commands that put text, barcodes and labels on paper.
beginnerModule
Logic Level Converters: MOSFET 2/4/6-Channel, TXB0108 and TXS0108
Five boards that let a 3.3 V board and a 5 V part share a wire safely. Which one to use for I²C, SPI, serial or an LED strip, which side is which, and the three wires that come before any signal.
beginnerModule
Logic Analyzer Kit, 8-Channel 24 MHz
Eight channels sampled at up to 24 MS/s, straight up a USB cable. It decodes I²C, UART and SPI at the speeds a microcontroller actually runs, and the sample rate is the number that decides the rest.