Hi there I am in the process of building a little diy fuel injector tester/flow bench. I have next to no programming experience but have managed to piece together some code that has gotten a relay to pulse and some potential for feedback on an OLED. I'd like to add a few features but I don't really know where to start, I was wondering if I could have 2 different pulsing modes activated by a switched input. Also if there is a way to adjust the frequency/duty cycle through a potentiometer would be incredibly helpful. Any assistance is greatly appreciated, Thanks!