Interactive simulation of a 4-cylinder engine via the L293D chip

The work is powered by an Arduino Uno microcontroller, it contains 4 light-emitting diodes that represent cylinders, a potentiometer that represents the gas pedal and an electric motor. It is powered by an external source of electricity in the form of 2 AA batteries and 18650 batteries. The brain of the circuit is the L293D chip that controls the speed of the electric motor. Operation is started by turning the key in the key switch. The work is intended as an interactive way of learning for anyone interested in the operation of internal combustion engines.