Keep values stored after Poweroff.

Projects Programming
1

Hello,

I Need a simple Setup:

  • Analog Input 0-5V A1
  • Hardware Switch S1
  • Digital Output D1
  • Digital Output D2

When S1 is closed I want to read the values of A1 and store the highest and lowest value during S1 is closed. Lets say I measured 1,2V and 3,6V.

When S1 is open I want to read A1 and when A1 reaches 1,2V I want the D1 to be HIGH. When A1 reaches 3,6V I want D2 to be HIGH.

This is all simple and I have no any questions about this. My question is: how can I store the measured values 1,2V and 3,6V in a way, they stay in Memory even if there was no power to arduino for a while?

2

With external memory!

3

You can use the internal EEPROM if it's only those values. Just keep in mind there are a limited number of write cycles so you want to only update the memory when the values change, not every time through your loop.

4

Yes,

this was my question if that works. It´s simply two values and the Change of this value will be done maybe 100 times in total life of the board (I would guess if it´s ready, this is done Maximum 10 times).

Is there any sketches showing the EEPROM read/write for example on a Nano board?

5