Hey there!
I am trying to put together an audio amplifier and I would like to show (leds) the volume level by reading the value of the taper mounted on the preamp board.
Now, I can't simply connect the wiper lead to an analog pin. Is there any other way?
Any reply is appreciated.
Now, I can't simply connect the wiper lead to an analog pin. Is there any other way?
Why not? what is the nature of the signal? Is it AC? What is the peak to peak voltage? Is it DC? What voltage range?
groundFungus:
Why not? what is the nature of the signal? Is it AC? What is the peak to peak voltage? Is it DC? What voltage range?
The preamp will be powered with 12v or 24v DC
Now, I can't simply connect the wiper lead to an analog pin. Is there any other way?
First, find out if the output is DC or if it is the analogue signal.
Assuming it is DC measure the maximum voltage with the pot at one end of its travel.
Disconnect the pot and measure its resistance, at the outer 2 terminals.
Construct a voltage divider from 2 resistors such that the total resistance is at least 10 times the resistance of the pot, and has the correct maximum voltage at its mid point for the input you want to connect it to. Use that to reduce the voltage from the pot.
Is that enough to get you started?
The controller chip on that board works with 0-5volt DC from the pots (see uPC1892 datasheet).
Just share ground with the Arduino, and connect the analogue input(s) to the wipers of the control pots.
Maybe wise to use (10-100k) resistors between pots and analogue inputs, to be on the safe side.
Leo..
I still havent ordered the board as I am not sure which chip to get but I got the point.
Thx all !!