read out position of normal potentiometer - diyAudio
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Old 9th January 2010, 09:02 AM   #1
Jempie is offline Jempie  Indonesia
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Default read out position of normal potentiometer

hi,

I want to make a easy preamp but need to read out the position of an
regular potentiometer. The position of the potentiometer will be displayed
on a LCD of VFD display.

i have look for this design see link Remote volume

have any of you some links i can use?
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Old 9th January 2010, 04:50 PM   #2
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You'd need an ADC to do that. Technically easy enough to get the PIC processor to do it, but then you'll need to modify the source code - meaning you have to understand PIC assembler. Do some searches on PIC analogue-to-digital conversion.

(There are several tricks to make an ADC without requiring a PIC that has onboard ADC too)

It would be easier I think to use a rotary encoder, (or even an ordinary rotary switch with the detent ball bearing removed, and the end stops removed, so it behaves like a rotary encoder) With some logic chips you could get that to mimic the UP/DOWN button pushes; otherwise once again, you need to modify the assembly source code to make it read the shaft encoder.
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Old 9th January 2010, 10:52 PM   #3
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You have 2 options for monitoring the position of the pot.

1. Use a pot with additional channels/sections and use the extra section to
create a voltage divider by applying a reference voltage across it and reading
the voltage on the wiper via an A/D converter. A PIC microcontroller as in the
previous post, with an on-board A/D would be a simple solution. The micro
could also drive the display with the position data.

2. Use a couple of relays to switch between the audio signal and a reference
voltage applied to the pot. Then measure the voltage as in option 1. You will
need some way of changing the function between listen and measure such as
a button or switch.

Option 1 is the best way to go about it though.
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Old 9th January 2010, 11:58 PM   #4
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I get the impression the OP does not want to put audio through the pot at all; i.e., it's a 'digital' level control and he wants a conventional look and feel to it.

One problem if you use a normal pot for this - AND remote control - the remote control can change the volume without moving the pot position, so there is a mismatch between where the pot says the volume is, and where the remote control says the volume is.
A rotary shaft encoder solves this problem, since the PIC only detects forward or backward motion of the knob, and not its absolute position.
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Old 10th January 2010, 08:05 AM   #5
danzup is offline danzup  Romania
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Quote:
Originally Posted by Jempie View Post
hi,

I want to make a easy preamp but need to read out the position of an
regular potentiometer. The position of the potentiometer will be displayed
on a LCD of VFD display.

i have look for this design see link Remote volume

have any of you some links i can use?
Project Nr.2 from :
Yet another Volume controlers and source selections
it use CS3310 or PGA2310 and I have o variant which use an encoder for adjusting volume or input .
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Last edited by danzup; 10th January 2010 at 08:10 AM.
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Old 11th January 2010, 12:44 PM   #6
Jempie is offline Jempie  Indonesia
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hi danzup,

nice job, is it easy to convert into MICROCHIP?
the problem is that i have an preamp with remote control, but with no indication

regards,
Jempie
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Old 11th January 2010, 01:06 PM   #7
danzup is offline danzup  Romania
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Quote:
Originally Posted by Jempie View Post
hi danzup,

nice job, is it easy to convert into MICROCHIP?
the problem is that i have an preamp with remote control, but with no indication

regards,
Jempie
Sorry, no !
I only work with Atmel AVR .
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Old 11th January 2010, 03:40 PM   #8
Jempie is offline Jempie  Indonesia
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hi danzup,

can I order the kit complete what will be the price?
regards,
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Old 13th January 2010, 12:56 PM   #9
Jempie is offline Jempie  Indonesia
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hi danzup,

can I order the kit complete what will be the price?
regards,
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Old 14th January 2010, 12:00 PM   #10
danzup is offline danzup  Romania
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Quote:
Originally Posted by Jempie View Post
hi danzup,

can I order the kit complete what will be the price?
regards,
No more kits left , all gone .
But there are some PCB left , if you want some please contact me on pm .
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