Serial Communication

A side-by-side comparison of the three serial buses every microcontroller project runs into — I2C, SPI and UART — across four axes: number of signal lines, speed, how many devices you can hang off them, and wiring distance. Includes a decision flow and what to look for on a scope.

Read sensor voltages with the Arduino ADC and stream them to the serial monitor in real time. Covers 10-bit vs. 14-bit resolution, the voltage conversion formula, and PWM output — with code that runs on both R3 and R4.