Adaptive sleep time

[gohan]

I am looking into a way to proportionally increase the sleep time as the voltage of the battery/supercap decreases. I have tried with map function but I think I messed up and getting weird results. I am looking for suggestions to make something flexible that can be set to a minimum sleep time and a max. At the moment a made something that works in fixed steps but it is not very elegant nor very flexible

[manutremo]

@gohan At first approach, I would say the map function should be the way to go.. what is it that it's working weird?

[raptorjr]

Would it be possible to divide the sleeptime with the voltage? As the voltage is getting lower the sleeptime will be higher?

Start with a number that after dividing sems good. Then it will automatically increase when voltage decrease.

[gohan]

@manutremo I don't have the code with me, but if you are kind enough could you post a map function that you think could work.

[manutremo]

@gohan If I understood correctly what you are trying to achieve, do you think this could work?

#define VOLT_MAX 3.7
#define VOLT_MIN 3.0
#define SLEEP_MAX 100000
#define SLEEP_MIN 10000

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

float v,p,s;

v=3.5;          // Result from volt reading routine

p=(v-VOLT_MIN)/(VOLT_MAX-VOLT_MIN);

p=constrain(p, 0, 100);

s=map(p, 0, 100, SLEEP_MAX, SLEEP_MIN);

sleep (s, true);             // true for smartsleep, false if otherwise
}

[gohan]

Thanks a lot, I'll look at it in the next days. Today I woke up at 5 am and returned home at 8pm... My neurons are not very cooperative at the moment

[mfalkvidd]

@gohan so it's actually you who needs a set sleep time based on energy levels?