The traditional approach to programming a microcontroller has been with high-level languages like C or C++. Programmer Tools like compilers are used to take the high-level language code and disassemble it to a machine code format. A no-code approach can now be used to program a microcontroller using a ladder diagram programming language. In this talk, an open-source ladder diagram programming platform called OpenPLC will be discussed. OpenPLC is based on the International Electrotechnical Commission (IEC) 61131-1 Functional Programming Languages standard. Participants will learn the basics of a programmable logic controller ladder diagram and how to implement control function tasks using the OpenPLC Editor. The OpenPLC Runtime environment for programming and monitoring the control functions embedded on the microcontroller will be presented in the talk discussion. The Arduino Uno -Microchip ATMega328 based platform will be the development tool for implementing specific OpenPLC control function tasks.