To install RPI OS, download the raspberry pi imager onto a pc or laptop. Insert the SD card, and within the imager, select “Raspberry Pi 4” for Raspberry Pi Device, select “Raspberry Pi OS (64-bit)” ...
The MCP4922 is a Digital to Analog Converter that has 2 Channels and 12 bit resolution. The regular version has 14 pins and the datasheet is available here: http ...