Velleman and potis

Hello

My project is progressing and I have almost finished the control module. But I had a little doubt emerged in the wiring of potentiometers. Is it correct this scheme, or is it a mistake?.

Someone can help

Regards



Two images more

more information in my web http://simtxus.googlepages.com

I'm only in the first phase (reading and checking the parts)
But i found something, maybe it helps:

http://www.x-simulator.de/forum/post6532.html?hilit= ic1 remove#p6532

Hey Ego,

Ran across your K8055 pot wiring reccomendation from this post which refers to the original. post6532.html?hilit=%20ic1%20remove#p6532

I had a few questions on this.

First I have not had success even with the included demo program in getting a pot to to move the slider in the demo (trying to first test this)

I have tried all configurations and it just shakes on the slider not really getting the pot input to do anything with the slider

using 5V positive off of SK2 (also tried SK3) ground is common so connecting oppisite end to ground terminal tried all of them (but they all should be common)

wiper connection to A1 or A2 and nothing. This is how I expect it to work.


Your drawing suggest bypassing it all and going to PIC as well as removing the IC1 (I want to say you mentioned it adds noise or interence)?

anyway, If I do this, will it resolve the issue? or should I at least be getting something the standard way.

I understand your method as you are suggesting a more accurate connection (which I definately rather have), but would removal of IC1 loose my pwm output ability or are they not related and Ic1 is strictly for the analog ins? just want to make sure before doing the surgery.

el_txus,

In your implementation, you have the jumpers on for the SKs. Is this required and is it also required to pull the 5V from the Pic or can you just use 5V from SK2 or 3 (of course then they have to be not jumpered or the at least not the one you are wanting to get 5V from. Maybe my problem is I do not indend on using the internal pots so did not install the headers for sk2 /3. maybe this is my problem? Do they need to be there and jump for external to work?

Thanks!

This is to follow-up this thread and close out this post. The method to use internal 5V of velleman for analog input has been found to just use 5V off either jump SK2/3 pin (or its solder point) and move the test pots full clockwise (jumpers off the SK pins of course. If you do not install the test pots (as I chose) then you must solder a jumper from the 5V lead (single post of the each test pot to the other end (top post - when looking at the board from behind - it goes diagnal up). This is to mean that if you do not install the test pots you will have to will this jumper to get it to work. I also glued a terminal where one of the test pots would go and jumped that to the 5V of SK2. This is so I can detact all sensors fast with screw terminals in which I though was more convient. It has also been noted that you can wire directly to the PIC, but I found it accurate enought (well as accurate as 8bit can be) to just connect at board solder points. MboRacing offered explanation on going to pic as being can stabilisize the signal out of the Pots a little better. could not tell a difference over the two methods...but something to try if you are not happy with just making connect on board.

kyle