Successful drive test

Accelerates and decelerates. Backs up and turns around.

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New wheels

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Actually, these are reused from my first CNC project, which lies behind a pile of junk in the garage. With a locking washer, I was able to mount these to the bot.

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2015-04-25 · 23:49

New display

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Brighter and easier to read while moving, the new display shows status information at a glance.

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2015-04-25 · 00:40

Open heart surgery

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OK, maybe not as dramatic, but it was just as vital.

With my final project deadline extended a week, I took a couple days of downtime to catch up on sleep. The all-nighters were adding up. Now I’m back and making some minor changes and a few fixes. Hopefully the thing will drive in reverse without catching on fire. If you don’t hear from me, send help.

Firmware for the not has been fleshed out and I’m looking forward to getting it coded. The loop is simple, checking the status of each input and setting a flag. That flag is passed to the three output functions, which run after the input stage. One exception is the turnaround() function, which is called by an interrupt on the whisker pin. Some output functions call themselves to complete a series of drive commands, for instance. This keeps things simple.

More to come.

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2015-04-23 · 20:05

All together now

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2015-04-20 · 21:18

Late night testing

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2015-04-20 · 01:30

Motor driver board

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Mounting at the rear, near the motors, his board is centered around a SN754410, a quad half bridge driver. The IC includes clamping diodes, but external Schottky diodes add an extra layer of protection from potentially ruinous flyback current.

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Filed under analog, Battery power, edX, ICs, Motors, PCB design, Robots, Soldering