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I'm trying to drive a small DC motor from an arduino using an H bridge. Do I need to size the H bridge to handle the stall current of the DC motor or just the normal operating current plus a safety margin (but still not as high as the stall current)?
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Aug 21, 2012 05:29
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movax posted:Personally, I'd size for at least 1.5x the normal operating current. Do you have any idea what in-rush current/transients can spike to? Safety margin(s) are always a good idea. If you have a chip rated for 1A, you have no idea if that chip barely passed QA or exceeded requirements with flying colours. Yeah, we went with the 5A h-bridge so I don't think it will be a problem. Unfortunately I'm not sure what the transients might look like this because I don't have the motors yet.
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Aug 28, 2012 01:57
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Switzerland posted:Maybe (probably) this is a dumb question, but something I've been wondering about : Is there such a thing as a drag & drop board builder? To elaborate: Say you want to create a small embedded system that has, say, an ARM chip, four USB ports, obvious stuff like a power plug, RAM, HDMI out, etc.? So you just drag & drop the various chips and connections, and it provides you with the schematics, ready to have it made? I'm sure there are plenty of dev boards that would have that, maybe with two usb ports instead of four. You could take something open source that has most of what you need (Beaglebone Black maybe) and modify it.
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Apr 3, 2014 04:29
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Switzerland posted:I meant more like in software, e.g. you have a list of CPUs, ports, I/O, etc., and the software figures out how to interconnect all of that. I've never heard of anything that will automatically tell you e.g. what ports you need to connect from your USB port to the microcontroller and then make the gerber files for you to have a board built. quote:Also, I have no idea how easy or hard that would be. Well to modify the Beaglebone Black you would download the Orcad files here: http://beagleboard.org/hardware/design Open them up in Orcad and make your modifications. This will involve modifying the schematic, where you place components and choose which pins/connections go where, and the layout which is the to-scale representation of how the components will be arranged on your circuit board and how the traces are routed. Then you pay some money to have your board fabricated, buy the components and solder it all together. It would probably be a pretty big job. Are you asking out of curiosity or is there something specific you are trying to build?
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Apr 3, 2014 04:55
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Does anybody have any advice for getting into Bluetooth? I'm thinking books, websites or development kits. I'm starting pretty much from scratch but it seems like a hot topic these days and I am interested in learning about wireless stuff so it seems like a good place to start. Google took me here to a TI kit but I would like to hear some opinions before I drop $100 on it.
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May 17, 2014 05:57
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