In this lesson, we learn how to use the MCP4725 12-bit Digital-to-Analog Converter (DAC). The chip and module are explained, the datasheet is reviewed, and then, using five projects, this MCP4725 is practically shown. Full wiring diagrams are shown, and how to use the code and library is explained. In Project 2 in lesson 109, set the output voltage of the MCP4725 DAC from the Arduino's Serial Monitor.