ESP8266 Community Forum

I am totally noob at electronics and using ESP8266. I am using NodeMCU.

I want to create a seat occupancy sensor by using a load cell (3 wire).

What it should do is:
- Poll the load sensor every x (preferrably 5 to 20) seconds
- When there is a change (from above threshold to below threshold or the other way around) turn on wifi and fire a HTTP GET request to a webserver, after that turn wifi off again.

I am using an HX711 (ordered, but not received yet) and an ESP8266.

See the attached breadboard image for my try.

But I am wondering if I am doing it right. Between every x seconds I can turn ESP to sleep, but HX711 won't.
I need a year long battery life or so on 2 AA's.

So here are my questions:
- Is the schematic right?
- Is there a better way to save power?
- Is there a better way to do this completely?

Put me on the right track please!

Thanks!

I can turn ESP to sleep, but HX711 won't.
I need a year long battery life or so on 2 AA's.

Use a pressure switch. That will be the lowest power solution.

rudy wrote:Use a pressure switch. That will be the lowest power solution.

I can't find any (cheap) pressure switches? Can you give me some links?

rudy wrote:Use a pressure switch. That will be the lowest power solution.

Can you show me some product links? I can't seem to find any (affordable) pressure switches suitable for this goal...