This is related to a recent posting about power saving.
I have a battery powered project that includes a GSM module that needs to send an SMS about once an hour. The GSM module is quite power-hungry and requires high(ish) current regulator at 3.8 volts.
The GSM module is only needed for a few seconds every hour, but the voltage regulator I’m using (this one… http://uk.rs-online.com/web/p/low-dropout-voltage-regulators/6865869/) has a high background current of 40ma. So I’d like to be able to use the arduino to switch the regulator off most of the time and only switch it back on when it’s required.
I’m kinda guessing that I can do this by controlling the input to the regulator with a thingy connected to a whotsit via a whatjmacallit.
Can anyone point me in the direction of a suitable circuit. Please speak slowly in your replies, electronics is all a bit vodoo to me. Existing regulator setup as shown…