This device is designed to simulate a 4 to 20 milliamp analog sensor. I had the idea for this device while trying to debug an issue with an analog sensor. I had no way to simulate a current draw to see if the input for the sensor was actually working. So I built this device to be able to do just that. The function of the device is really simple: as you turn the knob to the right, the current goes up from 0 to 20 milliamps.
The PCB was designed using EasyEDA. This is actually the first pcb I have ever designed. I can definitely vouch for their software being easy to use. It only took me one weekend to finish designing the PCB. The PCBs turned out great and I will defiantly consider making PCBs for my projects more often.