Potentiometer Wiring Diagram - This is a list of Mercedes-Benz specific Diagnostic Trouble Codes (DTC) or also known as engine fault codes. Please note that there are Check Engine / Service Engine / CEL fault codes which are stored in the Engine Control Unit (ECU).. In this project we will learn how to build a simple fire fighting robot using Arduino that could move towards the fire and pump out water around it to put down the fire.. If you plan on working with robots or just building things that move you’ll eventually need to learn how to control a DC motor. The inexpensive L298N H-Bridge module is a simple way to achieve that..