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| jarrin > Interests > Electronics > Motorized Armchair | |
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Successful H-Bridge 4/21/2006 11:25 AM
My next task is the encorporate the 3-line logic as described on this page so that I only have to use one PWM control for each motor (rather than two, if I didn't do it this way). Also, the 3-line system prevents any "smokeable" conditions (it prevents the circuit from being shorted out by having two adjacent quadrants on at the same time). I also need to heat-sync the Darlington transistors before trying to drive the motor underload. I'm still afraid that these transistors might not be able to take the motors maximum current draw (especially not for very long). I guess I should consider putting a 8a fuse in line with the motor just to prevent my expensive ($.50) transistors from being fried. (I already have to order some more from Jameco because I accidentally only ordered "enough" last time.) And once all that is working I'll actually be brave enough to stick my PIC18F452 into the circuit without worrying about frying it. |
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