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Jan 18, 2015, 02:50 AM
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Living on a train


BART has constant, massive delays. What is a 45 minute ride on paper is normally 1 hour. The delays are 1/4 caused by equipment failures & 3/4 caused by people. There is a big difference between the news & how happy people actually are, because they're obviously not getting by while the news would have you believe things suddenly got rosy on Jan 21, 2009. The reality is there are so many protests, crime, & health problems among people who are doing a lot worse than 6 years ago that nothing is working.

Living on a train for 10 hours/week is more productive than operating the break pedal in a car, but it doesn't leave any time to do anything but what can be done on a laptop. The sum total of a week of physical fabrication amounts to a very minimal revision of the Tamiya circuit board




The new board probably ended up being unnecessary, since it ended up manely removing most of the reworks instead of integrating them.

Current sensing - a decided failure. It was easier to set a constant RPM than try to adapt the RPM based on power. Couldn't get an accurate reading of current usage. The user can manually adjust RPM based on steepness.

Headlight MOSFET - not worth the extra board space. Only set once per drive. Required a gyro recalibration.

3.3V - needed connections for external regulator.

Servo - needed connections for external regulator.

ESC - Needed PWM signal on 5V pin with pad to jump to 5V. The pad didn't make it.

Gyro - needed Vref pad

Hall effect sensor 3.3V, GND, out

SPI port for getting navigation data from the pi. For all the USB dongles & disabling the console on the lone serial port, the best way to get data from the PI to a microcontroller is its SPI driver.

There was an idea for dedicating 2 ADCs & a chip radio for sonar. Sonar had been proven in Ben Heck's robotic suitcase, but ideally the vision system could do the job. Sonar would require the human to wear a heavy emitter & a radio set just for the sonar trigger. It was a lot of complexity for 1 thing.
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