Hey Guys-
On Monday we learned about photoresistors and had a robot day! Photoresistors are light sensitive resistors whose resistance decreases with the amount of light falling on them.
We will be using photoresistors on our robots for the "Follow the line" competition and for "Robot Sumo."
We've all seen photoresisitors somewhere in our lives.....for instance my car as an auto setting for my headlights to turn on and off. When the resistor has enough light falling onto it, it causes electrons to jump into the next conduction band. The resulting free electron conduct electriciy, and therefore low the resistance of the resistor.
To use this on our robots, we needed to figure out the resistance range of the resistor for different light intensities. We used the 'white' of the our white boards and the black of non reflective electrical tape.
Once this is figured out, interface the resistors using voltage dividers to your microprocessor. The photoresistors will control one or both of your motors. You'll want to think about how you want your robotto behave for the line following competition and also think about what you want your robot to do when it faces the white outline of the sumo ring.
Oh...Mason also did some cool stuff in class...no he didn't light either of the Peter's on fire, but he put stuff in a microwave that shouldn't have gone into it, and made sparks fly.
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