October 15, 2010
I really didn't know which forum this should be in. To start, let me say my head almost exploded after Chris el Carpintero on Live Show 007 casually mentioned his use of a i2c servo controller. Sweet Hey-suess, that means two wires can control a grip of motors right? Just making sure before...
So I marvelled on that for awhile. Then I started looking up what components are on one of the salvage boards I found. A hex schmitt inverter, 2595 volt reg, some monostable vibrators, and this A3977SLP. Thankfully it's in 28 pin TSSOP packaging so I can extract it easily. It only drives one motor but it seems to have some interesting features. I don't know, I haven't had to deal with PWM motors yet. I know it's worth ~$8 on Digi-key. These pass through the dumpster now and again. Does it look like a useful IC? Would anyone find these useful?
The common thread here is this motor controller can get 1, 1/2, 1/4, etc step out of a pulse on one wire. CtC's servo controller (and feel free to send me more info on that gem, thanks :D ) only needs the two i2c pins to power multiple motors. Amazing to me how much you can milk out of a couple wires.