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myAdc = reading of adc
myState is remembered variable for the current condition (only three values)
myPins is pic pins to change to set the current condition
(ps. be sure you have diodes across the ...

No. It's time for you to do some real testing (I mean really serious rigorous testing).

You've not cleared the error in this section of code.
case 2: //in the middle

output_low(RELAY_ ...

As I said before I only did a quick check.
I thought you had missed a test, but on more careful examination they do all seem to be there.
There are, however, some glaring errors which testing in the ...

OK. I've had a quick look at your code.
It's quite cumbersome but should, in principle, work.

You're now:-

Getting into a known state at start-up. OK
Then depending on latest state deciding on ...

I think that this code could solve my problem:

v = read_adc();

switch (state)
{

case 0: //IDLE STATE; only the first time.

if (v < th_low)
{
st ...

That will work fine as long as the variable changes continuously. If there can be jumps between trips through the test then you could go from State = 0 to the deadband between State 1 and State 2. T ...

I think that this is a threshold comparator with two hysteresis, one for the upper dead band and one for the lower.

Any advice? I think that a switch with five case could resolve the problem. :con ...

Here my code:

if (v < th_low - k) // k is a value to set
{
state = 0;
}
else
if ((v > th_low + k) && (v < th_high - k))
{ ...

What you now have is a system with five states, as shown below:-

Max. ADC reading

Upper region. Set required relays state here

---------------------------------------
TH2 Do NOTHING in t ...

Sorry, but I don't understand.

When volt > RELAY_2_ON, we have also the condition volt > RELAY_1_ON thus relay 1 and relay 2 are ON? Is this correct?

I asked several post ago for an EXACT ...

This is a classic 'state' problem:

#define RELAY_1_ON (130)
#define RELAY_2_ON (160) //Set where you want
#define THRESHOLD (5) //threshold to turn off
#define OFF 0
#de ...

Yes,when the adc_value is changing close to the threshold, for example the low threshold, I would have a stable output. For example, when the adc_value is 101 relay is on but, when the adc_value step ...

Here the code:

#define blind 0
...

int state;
adc_val = read_adc();
threshold_low = 100;
threshold_high = 400;

hysteresis_low = abs(adc_val - threshold_low);
hysteresis_ ...

Hi. First of all very nice and useful forum. I am an electronic engineer and I need to add hysteresis for two thresholds in order to avoid the relay chattering. Here the pseudo code without hysteresis ...