Please be patient the interactive circuits take a few seconds to load.
Here are a collection of interactive circuits I have created on Autodesk circuits. If you do not have the luxury of a electronics lab this is a good way to start learning. I also use it now to test designs and code before I build something.
The following is a motor controller based around a dual H-Bridge motor controller chip, The L293D
Below is a Arduino controlling Adafruit NeoPixel ring of 16 pixels. I have added Bluetooth support but no code for Bluetooth input.
Here we have a fully analog fan controller based on a operational amp and a analog temperature sensor. Once the temp raises to 48C the op-amp will trigger the Nmosfet turning on the fan.