How do I Log the lowest adc value and display it

pdl · Joined: 01 Jun 2005 Posts: 45 Location: UK

Hi guys

I would like to log the lowest adc value and display on a set of leds.

I have coded what looks like an led bar the circuit and the code that I have done takes a voltage into the adc and then displays it on the bar of leds.

I would like to get one of the leds to flash at the lowest value that the adc sees.

Can anyone help with this part of my code or give me a hint.

Many thanks

Pete

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

To save the lowest value, you just do a simple test. Compare the
current value to the previous lowest value. If the current value
is lower, then it becomes the new "lowest" value.

The program below shows one way to do it. Once you get a low value,
you will never get anything higher than that as the output. Once you
turn the trimpot down to 0, this program will keep displaying 0, no matter
what you turn the trimpot to later. I'm not sure if that's what you want.
At least this code will give you some ideas.

pdl · Joined: 01 Jun 2005 Posts: 45 Location: UK

Hi PCM programmer

Thanks for the help. I now have some idea of how to do it. I just could not get my head around it.

I am slowly get the hang of C. Every program I try to write I learn something new.

Thanks PCM you have been helpful every time I have asked for help.

Pete