not everyone has the same version as you
I am curious though: if you used transistor with the base hooked up to a digital pin (maybe two) could you then disconnect one I2C device from the I2C bus, send your command, then reconnect it, disconnect the other and similarly send to the second device? That way you could control multiple devices with same ID from one Arduino.
However If you think it's necessary, I can add it in.
Ok, when I see a huge driver chip like that I assume large currents.QuoteHowever If you think it's necessary, I can add it in.Look at the on resistance, x that by 600mA to get the watts generated, x that by the C/W value that should be in the data sheet. That will tell you how many degrees above ambient the chip will run. Add that value to the expected ambient temp and if the result is over the max junction temp you will have problem.Clear Now the schematics I really don't understand. You seem to have GND from each pair going to a header (and from there I assume a motor). How do two GND lines control a motor?The drawing has lines all over the place including through components, and as far as I can tell the pin names don't match those in the data sheet. For examples you have pin 2 as "EF", in the data sheet it's "IN". There is no EF on the chip unless we're looking at different data sheets. Can you post a link to the one you are using?And the mess of resistors between the optos and the driver is indecipherable.The purpose of a schematic is to make a design clear, this one does not do that I'm afraid.______Rob
How does 12V get into the board? I don't see a connector for that.This board will mount on top of a Mega? You can't supply motor power from the Mega - the Mega input connector is not rated for that much current, and neither is the header. Add one specifically for the board, and pass 12V to the Mega if you want just 1 power connector.
Those devices have a worst case Ron of 0.5 ohms (full temperature range), 0.2ohms(typical for a cool device).At their rated current of 5A they will be dissipating about ~ 10W each or so, so largemetal heatsink is mandatory. Up to about 1.3A they will survive without one I estimate.Where did the 44A figure come from?