connecting the easy stepper v3 stepper motor driver

science_geek

i am working on interfacing the easy stepper v3 stepper motor driver http://www.sparkfun.com/commerce/product_info.php?products_id=8368
i have it working with the prop, but when i try to change direction (pull the pin high), it does nothing, i cant get it to change direction, i know its not the driver because i used a bs2 to drive it and it worked fine, any suggestions, is my voltage not high enough when i pull the pin high or what?
any suggestions are appreciated.

Mike Green

The driver chip is designed to work with a 3.3V or a 5V power source, but the SparkFun product includes a 5V regulator and is designed to run off 5V. When the driver chip is running off 5V, the Propeller can't supply a high enough output voltage to control the driver chip. You'll have to provide some kind of interface driver. There's a long thread in one of the "sticky threads" that discusses interfacing 5V devices with the Propeller.

science_geek

would it work to just use an optoisolator on each line, then have the output of the optoisolator hooked up to the 5v regulator. would i need any other circuitry other than a few optoisolators

Leon

Why not use a logic level conversion chip? It'll be much cheaper.

Leon

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

jazzed

I have 3 of these driving stepper motors attached to a propeller protoboard using series resistors. I've had no problems at all.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
--Steve


Propalyzer: Propeller PC Logic Analyzer
http://forums.parallax.com/showthread.php?p=788230

mctrivia

not sure about v3 but v4.3 has 2 solder pads in the bottom left of the board(looking at board so you can read the silk screen) which when shorted makes the board run at 3.3V. If you don't have this on v3 then just remove the internal voltage regulator and provide 3.3V yourself.