Temperature / Humidiy node

wireless temp/hum sensor and connected objects

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I Have two years that i begin working with this project. I say why not we make a system that can monitor and visualise temperature in many place and many corner. so the idea is to make small module rf with temperature / humidity sensor and battery CR2032. each module (called node) can communicate with central. the central have access to local network and present data with integrate web server. so when you put ip adress in chrome or mozilla, a web application called and you can monitor all temperature sensor and give idea about temprature repartition in your local.
also I thinked to add alerts, a speaker module that can configured for temperature that send alarms when temperature quit intervals. also i thinked in relay, so we can make the rf cover big to vommunicate with all modules

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Benjamin Prescher wrote 02/05/2020 at 15:23 point

Hey! I have often thought about such a PCB. However, the range of the NRF24L01 in buildings somewhat discourages me. A SUB 1GHz system may be better suited for low data rate applications. Have you already been able to test the system and its range in the building?

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aymen wrote 02/05/2020 at 15:32 point

not yet

but i thinked in rfm69

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Benjamin Prescher wrote 02/05/2020 at 15:47 point

Oh nice one. Haven't known the IC.

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aymen wrote 02/06/2020 at 12:23 point

It says that can arrive t 1km and more
and it have RSSI so u can control the signal quality

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Gerben wrote 02/02/2020 at 17:27 point

Looks great. What temperature sensor are you using?

I had a similar project, but never finished it.

PS some observations on the PCB. Running the ATMega328 at 16Mhz on only 3V is out of spec. That's why, for example, the 3.3V Arduino Pro Mini runs at 8Mhz. Also, the crystal is a bit far away from the ATMega.

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aymen wrote 02/02/2020 at 20:39 point

I use the Si7021-A20 as a temperature / humidity sensor.

first time i developed the project using arduino nano ( i remove the regulator, led and some component) and maked the prototype. no i dont know why i installed 16 MHZ. thank you for this information i look for it

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