Making a data logger, like many. So low speed and very low power.
I am using an 3V Pro Mini, DS3231(RTC), SDcard and a Dallas one wire sensor.
So far my low power initiatives are:
- P-channel mosfet powering SDcard reader when required.
- DS3231 is modified with LED and charging resistors removed and battery replaced
with a CR2032 cell and powered on Data pin with resistor and .1 mF cap.
Okay… I have tried and have reviewed on line to make my RTC with no main 3V power
interrupt and wake the Arduino; no success. If anyone has a solution I would like to hear it.
So my current sketch has the following
sleep59(): Sleep the Arduino for 7 X 8 seconds
Sleep 2 seconds and sleep 1 second
Then SleepTillMin(): power up RTC and interrupt on the next min.
i.e. about <1 second later.
anyone got a better solution???