Author Topic: Using a potentiometer to control smart controller instead of a throttle  (Read 2300 times)

Offline Momomo

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Hi all. I need help figuring out how to use a potentiometer instead of a throttle to control the speed on my Smart Pie with external controller. I purchased a 1megaohm pot and tried it but no luck. Help!

Offline Bikemad

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Re: Using a potentiometer to control smart controller instead of a throttle
« Reply #1 on: February 22, 2018, 10:49:50 AM »
Hi andto the forum.

A one megaohm pot is too high a resistance to operate the controller.

I would suggest you try a 5k or 10k pot instead.

Alan
 

Offline Tommycat

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Re: Using a potentiometer to control smart controller instead of a throttle
« Reply #2 on: February 24, 2018, 01:56:17 PM »

Quote from: fechter post_id=1358671 time=1518804832 user_id=84
You can use a regular potentiometer if you place fixed resistors in series with the 5v and ground wires.  I would use a 5k pot, but the value is not critical.  The fixed resistors for a 5k pot would be about 1.2k each.  You want the signal to go from about 1v to 4v with a 5v source.

I've also read where the high should be 4.35 volts or there abouts.

5 volt into Pot on one side tap, signal out on middle tap, and ground to other side tap...
See my completed Magic Pie V5 rear hub E-Bike build  HERE.