Arduino: Find the greatest value

RE: Arduino: Find the greatest value

Former Member — Tue, 11 Feb 2014 03:40:39 GMT

Here is what I am doing. I have a photo resistor on a servo. Every 5 minutes I want the servo to move to 10 different positions and take 10 readings. Then I want it to take the greatest of the readings and move a different servo to the positions of the greatest reading.

Thanks in advance,

Nehemiah Branson

RE: Arduino: Find the greatest value

dougw — Mon, 10 Feb 2014 19:48:38 GMT

Hi Nehemiah,

For a software solution you could use a "For" loop.

Cycle through all 10 readings - if the next reading is greater than the max reading, replace the max reading with this new value.

Doug

RE: Arduino: Find the greatest value

dougw — Mon, 10 Feb 2014 19:33:13 GMT

Hi Nehemiah,

What is the timing of your 10 readings?

You might be able to use a "peak-hold" circuit to retain the maximum analog voltage and just sample it once.

There are lots of example circuits on the net - the simplest uses just a diode and capacitor and maybe a resistor.

For higher accuracy you can add a dual op-amp to eliminate the voltage drop across the diode.

If you describe the requirement in more detail, the optimal solution description can also be more detailed.

Doug