Generating Electricity with Motors
For my DIY Making Kit, I want to build a kit that allows young people to build their own wind-up phone charger.
I began exploring how to build a motor generator with a very small geared motor from an arduino electronics kit (it as originally a robot wheel).
I built a circuit to charge batteries (using just a diode and resistor) but I quickly discovered that this motor could not generate enough voltage to properly charge AA batteries at the speed I could spin it (I was getting some increase in charge, just very minimal).
I then purchased a 4.5 to 15V motor from Maplin which was able to easily generate the correct voltage.
I build a simple voltage regulator circuit to limit the voltage to 5V, the same power that comes out of a USB socket in a computer.
After connecting the battery end to the power in and ground of a USB female adaptor, it was time to make the scary jump to actually plugging something in (I chose an old USB speaker).
This is how my circuitry currently looks within my kit design. Problems I still need to overcome:
- To get it to charge a smartphone I believe I need certain small voltages going to the two data cables (the green and white cables).
- How can I regulate the current? Do I use a capacitor or a battery?