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guns don't kill people...people with mustaches kill people
Foto: www.flickr.com/flamothe
Retoke: koleguito,funitastika y kxalot
Sorry for the blur, but it's the only shot of this end from below-- the pot+switch with the diodes, and the IC splayed out.
Control of the electric kickboard with an arduino.
The arduino controls the speed of the motor through a PWM signal (that's one of the "hacked" parts of the original electric kickboard) that itself depends on the amount of light read by the light sensor. The arduino controls the direction of the motor through a relay (the other "hacked" part).
Our first lab run of the solar water pump using a helical impeller (like the ones used on an oil wells) and a PWM (Pulse Width Modulation) 3 phase DC motor that is optimized for solar use (shifting the PWM frequency depending on voltage coming from the array…which tends to changes throughout the day). What does this all mean? Well we never hit our target efficiency (92%) or even exceeded the efficiency of traditional water pump (80%), instead we peaked at 53.4%. Dismal results on the first try, but it is the first try. Now its time to fish out the problems…motor, pump, controller, PWM frequency, test rigs and more. Sure wish I had that Finite Element Analysis software right now!
Power outlet right next to the rightmost vending machine in the Gate 9/10/11 area, and under the phone booth. Very few outlets available in PWM, apart from the business center which isn't open early in the morning. No wifi available.