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EasyDriver V1 - This was the first attempt. Also did not have variable current limit or 5V regulator. EasyDriver V2 - This was the second attempt.
I had some boards fabbed at Futurlec without solder mask or silkscreen. The board was twice the size of V1, and routed to dissipate heat much better. The 5V regulator was added. I have since modded the completed boards to add the variable current limit.
EasyDriver V3 - A refined version of V2, with the variable current limit on the board, and switched to components.
I have not had any of these boards fabbed yet, as I'm confident in the design from the V2 boards. SparkFun is now selling these, and they work fine. Here are the difference from V3: This means you can now control every aspect of the driver chip yourself. You can put the chip to sleep or in reset drastically reducing power consumption.
Also, you get to play with PFD signal. That horrible tiny pot from V3 is now a somewhat larger pot.
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This allows for a 3-pin cable to your Arduino or whatever you use to drive the EasyDriver. This allows interfacing with things like 3.
If you want to supply your own logic power to the EasyDriver, cut jumper SJ1, and supply 3. If you want the EasyDriver to power some small circuit, you can use the 5V or 3.
How much current can you pull from here? Well, feel the regulator.
If it is uncomfortably hot, then you're using too much. How hot it gets depends upon what voltage you supply to the EasyDriver. Measuring this voltage allows you to calculate the actual max current being supplied to the motor. See the schematic for information on how to do this math.
I never do this myself - I adjust the pot until things 'feel' right on my motors since every situation is different. The value of the bulk cap is listed at uF on the datasheet, but 47uF is all that is really necessary.
The bigger the better - but the Allegro datasheet says 47uF is fine. SparkFun may use 47uF caps on their boards and that's OK. This helps prevent damage during over voltage events.
Common Questions and Answers: Q1 My motor says it can only take 2. Will the EasyDriver running from up to 30V blow up my motor or damage it in any way? Motors are specified with DC flowing through their coils.
But what we are concerned with is maximum current. The voltage spec of the motor doesn't really matter, using the EasyDriver. Or any chopper driver, for that matter. Then it will cut the power to the coil until the current dips down again, then re-apply power, over and over again, about 20, times per second.Find government information on education including primary, secondary, and higher education.
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