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March 14, 2010
about 3 months ago
What you can do is use a lower voltage supply. Since the stall current of a motor is a function of it’s DC Resistance you can actually figure out what voltage you should run to get them just below the 4.5A limit:
4.5A/4.9A * 12V = ~11V. If you make sure your motor supply is under 11V then you shouldn’t be able to exceed the max stall current of the driver board (I’d recommend 9V for safety and because it’s a common voltage). This does mean you’re limiting your maximum speed by about 25% (at 9V).
about a year ago
How sensitive is this board? I’d love to know if it could be behind some perspex or other plastic barrier and still pick up touches.
about 3 years ago
As with what bdcannon said, this means that your controller is never electrically connected to mains power, meaning that your controller is safe from being fried, and also that you are safe from being fried if you are playing with other parts of your project. It also helps prevent accidentally burning out a port on the MCU because you tried to sink/source too much current to the MCU. Definitely a big plus here. It also helps keep noise from the relays switching on and off from affecting other systems (assuming you have two supplies, one for the relays one for the rest of the system, which isn’t a bad idea if you’re going to do lots of fast switching).
about 5 years ago
I’ve been looking at this board quite a bit, and i’ve got one real question, is it possible to program this board from Linux?
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