author
7Instructables850,147Views115CommentsBerkeley, CAJoined July 24th, 2009
By day I'm a mechanical engineer at a university laboratory. In my free time, I do my own projects.

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  • Programmable Smart Solar Oven

    There's a photo in step four showing the PVC. That cylinder sticks up into a hole in the bottom of the oven, to keep it from sliding off. It may not be necessary. By the way, I found this lazy susan mechanism to not be very reliable. I've changed to a pulley mechanism and it works much better. Unfortunately, I don't have time to update the instructions right now. The entire box is made of foam, with a cardboard layer inside. The foam is glued together with RTV silicone.

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  • BLDC Motor Control with Arduino, salvaged HD motor, and Hall Sensors

    Hi Clifford,You get the amperage by dividing W/V. For example, 200W/24V = around 8 A. I would get that the chip in my project can't handle that, but take a look at the data sheet. If it won't, you'll have to find another driver that can, and adapt the project to it. Just be careful with safety precautions, because you could injure yourself, and/or blow out your components pretty easily.

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  • BLDC Motor Control with Arduino, salvaged HD motor, and Hall Sensors

    Hi Aaron,That's great that you got your motor working! Yes, it could be an over-temperature sensor that is stopping it, so I would try heat sinking. Also,you could be exceeding the current or voltage specs of the driver. Look on the data sheet for the maximum ratings. I think you just need to use ohm's law to figure out the current you need. First, measure the resistance of one of the motor phases. For example, if the phase is 10 ohms, then I = 24/10 or 2.4 Amps.

    Hi Capo.Ferrari,The instructable already has instructions for the regenerative braking.

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  • BLDC Motor Control with Arduino, salvaged HD motor, and Hall Sensors

    Hi,That sounds like a very interesting project. I have no experience with RC, but in terms of motor control, yes, I believe an Arduino (16 MHz clock speed) could handle controlling two motors at the same time. I suppose you would alternate the commutation between the two motors, and your algorithm would vary the motor speeds depending on the position of the joystick. Good luck!

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  • BLDC Motor Control with Arduino, salvaged HD motor, and Hall Sensors

    I don't think the Arduino would have any trouble with that, but you would want to beef up the power electronics.I don't think the L6234 could handle those kinds of currents/voltages (look at the datasheet to be sure).If you do start working with larger motors, be sure to educate yourself on the safety issues involved, both for your own safety, and for the care of the electronics components.

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