Hello everyone,
It's nice to see everyone again after some time
I was wondering what do you use to power a small 16F627A PIC based circuit projects.
My circuit consumes about 12mA on 5V supply. Until now I was using a 9V because it was convenient for me and I was playing around testing the circuits.
However now I made a useful device that a friend of mine will use regularly at his job.
After looking around I bought 4 rechargable Ni-MH AA batteries 2500mAh. Unfortunately I forgot that these batteries are 1.2V (instead of 1.5V that I originally thought!). So in series they will give 4.8V.
(Q1) The PIC and my other components work with 4.8V (I think!). For how long do those batteries keep that voltage?
Let's suppose this is my solution. Please review my calculations of battery lifetime on my circuit.
Battery Pack Capacity provides 2500mA for 1 Hour
If I am using 15mA they should last for about 166 hours.
(Q2) Is this correct ?
I need my device to take a measurement every 5 mins. So having it operating continuously is a SERIOUS waste of energy. I read the datasheet about putting the device to SLEEP and then waking up using the watchdog timer. But this period is too short.
(Q3) Is there any other way of putting a device to sleep and waking it up after minutes (instead of msec).
Thank you for reading!
It's nice to see everyone again after some time
I was wondering what do you use to power a small 16F627A PIC based circuit projects.
My circuit consumes about 12mA on 5V supply. Until now I was using a 9V because it was convenient for me and I was playing around testing the circuits.
However now I made a useful device that a friend of mine will use regularly at his job.
After looking around I bought 4 rechargable Ni-MH AA batteries 2500mAh. Unfortunately I forgot that these batteries are 1.2V (instead of 1.5V that I originally thought!). So in series they will give 4.8V.
(Q1) The PIC and my other components work with 4.8V (I think!). For how long do those batteries keep that voltage?
Let's suppose this is my solution. Please review my calculations of battery lifetime on my circuit.
Battery Pack Capacity provides 2500mA for 1 Hour
If I am using 15mA they should last for about 166 hours.
(Q2) Is this correct ?
I need my device to take a measurement every 5 mins. So having it operating continuously is a SERIOUS waste of energy. I read the datasheet about putting the device to SLEEP and then waking up using the watchdog timer. But this period is too short.
(Q3) Is there any other way of putting a device to sleep and waking it up after minutes (instead of msec).
Thank you for reading!