adding stepper motor example

[benschw]

Control a stepper motor (28BJY-48)

(this is a port of Matt Hawkins' example impl from http://www.raspberrypi-spy.co.uk/2012/07/stepper-motor-control-in-python/)

Datasheet: http://www.raspberrypi-spy.co.uk/wp-content/uploads/2012/07/Stepper-Motor-28BJY-48-Datasheet.pdf

[kidoman]

Thanks for the PR. Please have a look at some of the review comments

[kunalpowar]

Thanks for the PR @benschw. I'm thinking if this can be pulled out into a package which exposes something like

stepper, _ := embd.NewStepper(...)

[benschw]

thanks for all the feedback! I'll try to tackle the updates as soon as possible

[benschw]

I've incorporated your feedback, except the idea of creating a Stepper struct. If you'd like me to try that, maybe getting this approved and creating a new PR pulling the Stepper abstraction out and refactoring the sample to use it would make review easier.

Let me know how to proceed.

[kidoman]

Sounds about right

Sent from my iPhone

On 31-Mar-2015, at 5:47 am, Ben Schwartz notifications@github.com wrote:

I've incorporated your feedback, except the idea of creating a Stepper struct. If you'd like me to try that, maybe getting this approved and creating a new PR pulling the Stepper abstraction out and refactoring the sample to use it would make review easier.

Let me know how to proceed.

— Reply to this email directly or view it on GitHub.

[benschw]

sorry - so should I cancel this pr? or do you want to pull it before I get started on the Stepper struct?

[kidoman]

No I am going to merge this. That should be a second PR

[benschw]

Sorry, I wasn't totally clear on the empty lines. Could you let me know line numbers if I got any wrong?

[kidoman]

About the empty lines: I have left line comments whereever I noticed an issue

[benschw]

oops, I'm a little embarrassed about not running that before pushing.

[benschw]

also, I moved ticker.Stop up to a defer defined when i start the ticker; there is no Close implemented on Ticker