SparkFun Forums 

Where electronics enthusiasts find answers.

General project discussion / help
Did you make a robotic coffee pot which implements HTCPCP and decafs unauthorized users? Show it off here!
By paulle
I am new to Arduino and have a question. My project is to automate to lift open the window blind. I am thinking the board will control a motor which will roll up the blind, but I am getting stucked of how to stop the motor when the blind is lift to the top of the window. Any idea is appreciated.
By paulle
Is it possible to calculate number revolutions from the time of starting the motor? or another word is to get feedback from the motor of how many revolution it has gone through
By Mee_n_Mac
paulle wrote:Is it possible to calculate number revolutions from the time of starting the motor?
Yes and you'd be better off using a stepper motor in that case. But I'd still recommend a switch of some sort. I would also recommend a current monitor, as every blind I've ever used has gotten bound up as some point. Unless you have some clutch mechanism btw the motor and drive, you might overheat the motor. If the current monitor indicates too much motor current for too long, it's time to shut off the motor. You might also use it in place of a limit switch.
long long title how many chars? lets see 123 ok more? yes 60

We have created lots of YouTube videos just so you can achieve [...]

Another post test yes yes yes or no, maybe ni? :-/

The best flat phpBB theme around. Period. Fine craftmanship and [...]

Do you need a super MOD? Well here it is. chew on this

All you need is right here. Content tag, SEO, listing, Pizza and spaghetti [...]

Lasagna on me this time ok? I got plenty of cash

this should be fantastic. but what about links,images, bbcodes etc etc? [...]