circuit idea: // note -> times I specify in further text are symbolic
IDEA: -cap gets charged to full and is not currently connected to power supply -it starts to discharge throught paralel LED + resistor over next 2 seconds -when cap has too low voltage or capacitance to run an LED transistors base reads LOW from LED and using a NOT gate, CAP gets connected to the oower supply
here is a pic:
TRICKY PART i want the last step (battery charging the capacitor) to be 0.2 seonds long no matter what, how could I do it? WHAT I DO HAVE : I have all basic elements for breadboard, timer NE555 chip, a RaspberryPI Sidequestion: When capacitor is empty and transistors base reads low at ONE POINT is there any way I could make that point variable ex. Transistor reading LOW when CAP is 1/2 charged or 3/4 ?