booting up a high power module briefly to get some data

[loggerman]

Hello Felix, I am enjoying the articles on your website, and I bought some moteinos for use with my Lora system.

But I have another problem I was hoping you can help with. I need to briefly boot up a board that has a relatively high power requirement, so I need to switch on the 5v supply perhaps every 4 hours (need adjustable) to take a reading and then turn it off. I'm thinking a real time clock coupled with a FET (or relay) might do the trick, and I'm wondering if you have a product like that, or know of one somewhere?

It needs to be an extremely low power device.

Best regards, AB

[Felix]

It needs to be an extremely low power device.

The "switcher" needs to be low power? Just use a FET.

The timing part or deciding when to switch it ON is separate. Up to you if you want to do it with an RTC or just some other timer or based on an event.

If you want to couple the timing with the ON switching (ie all in 1 device doing the timing and switching) - you could use a TPL5110, but you will have to put it back to sleep via a GPIO as soon as your load is done doing whatever its doing.