Hi,
I have some Door/window sensors, powered by a cr2032 coin battery and I was able to run them for 1 year. The sketch above it seems ok, but the secret it's not only the software, it depends on hardware too:

• remove voltage regulator and led from the arduino
• choose a ceramic decoupling capacitor for your radio module, and avoid electrolytic capacitors (they have a bigger leakage current)
• I don't use any step-up converter, and use the battery to power both the radio module and arduino (reported both to work at 3V)
• a capacitor (again ceramic) of 100uF across the cell’s terminals could sustain a peak current load.

It's also better to avoid messages sending in a short time, and put some sleep in the middle, but I don't see that situation in the sketch.

Hi guys,
what do you think if we create on this forum a section about sell/exchange electronic spare parts? Probably we bought some 5 or 10 pieces packs from Chinese sellers and we don't use all of them, keeping stocked in our shells, but they can be useful for someone else. We could save time avoiding to wait shipping from China, like now I wold like to have in my hands an additional radio module but I have to wait at least 2 weeks.
Regards.

Hi,
I had started to analyze the communication protocol and the project. I found this site very useful. The problem is the sizing. I'd like to keep everything hided so a very small circuit is requested.

It is a while now I'm using my 2.0 GW (because I wanted to manage sensors connected directly to it) with 1.5 sensors node and everything is running fine.

If you are powering the device by batteries, I'd suggest to avoid electrolytic decoupling capacitors and go for ceramic or film one since the latter have a smaller leakage current, avoiding battery drain.

ok, some news here:

• first of all I fixed my issue with the gateway disabling the debug as suggested here.
• I had anyway some messages lost. Looking at the mqtt broker I couldn't see any message telling me the gw was rebooting and not only messages from gw to sensor were lost also between sensor and gw. I tried to remove the decoupling capacitor and is everything working.

thank you

With an external regulator it has been running already for 24h :)
thank you.

I want also to specify that my sensor was running under library 1.5.4. At the moment I'm experiencing an issue under the library 2.1.1 that makes the sensor continuously wake up, so the battery discharges itself after few hours. Better under library 2.0.0 but the initialization process has many transmissions failure that give to the battery a heavy blow.

Juts to leave a record about the issue. I changed the GW radio module with a NRF24L01 + PA + LNA one, powered by the AMS1117 and the ugly fix. Everything seems to working fine now.
Thank you to every one.