Need timer device with 3.3V to turn esp on and off

Projects General Guidance
1

Hi,
I built an ESP8266 with temp sensor that http posts to a local webservice.
I want to power it from a battery pack and to make it last as long as possible, I'd like to switch esp+sensor on, let it run for 10sec and switch it of for 4min50sec.

I'd like to do this with an external power supply with 3.3v
Is there any electronic device that does exactly what i need ?

Br
Gawan

2

Why not simply put the ESP8266 into deep sleep? Only uses 60uA then. See: Enginursday: Deep Sleep Adventures - News - SparkFun Electronics

3

There is a very low power clock chip, the PFC8593, which can be programmed to schedule events from milliseconds to days. To wake up an arduino, it has a line that goes high at the scheduled time which can be used as an interrupt.

4

Thanks, deep-sleep looks very nice, I think I will give it a try.
If my calculation is right the whole device can live several years with 60 uA on a common battery.

About the PFC8593 - does this chip have another name maybe ?
I could not find a single source to buy it from.

5

The ESP is designed for the age of IoT so yeay, a good deep sleep is key. It's indeed intended for situations like this. No extra hardware needed :slight_smile: