Controlling Pot FV-1 with PWM

Hardware questions and issues with the FV-1

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frotaitalos
Posts: 16
Joined: Wed Feb 07, 2018 9:06 am
Location: Brazil

Controlling Pot FV-1 with PWM

Post by frotaitalos »

Hi everyone, I'm trying to control the potentiometer inputs of the FV-1 through an arduino, I already managed to do that and it worked, but the arduino pwm works at 490Hz, can I have problems with pwm noise with this frequency?
igorp
Posts: 65
Joined: Tue May 19, 2015 6:10 am
Location: RU

Re: Controlling Pot FV-1 with PWM

Post by igorp »

Of course, square waves are wide specter, so, use low pass filter (at least RC chain of 10K resistor and 100n cap) maximum closer to arduino
And don't forget divider +5V of arduino into 3.3V of FV-1
frotaitalos
Posts: 16
Joined: Wed Feb 07, 2018 9:06 am
Location: Brazil

Re: Controlling Pot FV-1 with PWM

Post by frotaitalos »

I know there is a possibility of changing the frequency of the Arduino, but it seems like it's a complicated job, I'm going to do some tests with an LPF, thanks for the help.
igorp
Posts: 65
Joined: Tue May 19, 2015 6:10 am
Location: RU

Re: Controlling Pot FV-1 with PWM

Post by igorp »

atmel mcu have hardware pwm, but afair it's unused in arduino.
If you write own software on C , then you can use hardware pwm.

For now you can provide additional LPF on FV-1 side like : ldax Pot2 : rdfx pot2f , 0.002 : wrax pot2f , 1
micahvdm
Posts: 7
Joined: Tue Sep 09, 2014 9:15 am

Re: Controlling Pot FV-1 with PWM

Post by micahvdm »

You'll need to change the timers on the Arduino so as to not introduce noise.
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