sensors circuits

Posted on Feb 7, 2014

All of our electronic circuits were originally constructed on breadboards. Once the circuits were working, we soldered them on perfboards to give us a more robust system. We created a power board which stacked two batteries in series. This gave us access to a 14. 4V line and a 7. 2V line. We separated our high power electronics from all of our logic

sensors circuits
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circuits to decrease the potential for noise. We also implemented an emergency-stop which cut power to the actuators but left the logic circuits running. This allowed us to stop all of our motors if something went wrong but keep the logic circuits running. This board contains 4 primary elements. The first is the voltage regulating circuit. We used a low dropout regulator to power this board from a single battery. This means that the logic circuit could be powered even if the battery voltage dropped as low as 5. 5V. The second element is the flash sensor. We used a comparator connected to an NPN phototransistor to detect a camera flash. The third element is the tape sensor. We used an IR emitter coupled with an IR phototransistor to detect when we were on a particular color of tape. The output of the circuit fed into an A/D port and we calibrated the reading to determine tape color. The final element is the ball color sensor. It uses an IR emitter and detector to determine whether we obtained a black ball, a yellow ball, or no ball. We used a high power H-Bridge to control our launcher motor with PWM in drive-brake mode. We voltage regulated the launcher so that its speed would be independent of battery voltage. The voltage regulator sees a large amount of current for brief periods of time but once the wheel is spinning, the current draw is low. Thus, the average power dissipation is low and we were able to use a cheaper...

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