I'm a programmer and I recently purchased an Arduino Uno and I've very scared to short circuit it. I've been playing with http://www.falstad.com/circuit/ and have been able to create a few LED sketches and a piezo buzzer circuit.
So far, I've stuck everything behind a 470Ohm resistor. I have two problems.
- First, how far can I reduce my resistor but maintain board integrity? Bonus, what should I look for in Falstad's circuit app? Possibly current over a certain threshold?
- Second, what are some good ways to identify scavenged supplies so I can build safer circuits? Such as unmarked piezo buzzers, LEDs, and motors.
I've been doing research these past two days and discovered resistance lowers current not voltage. In order to lower voltage I can use a voltage divider