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I want to take the temperature value from one sensor on save it on the contract of manually , i tried to use node-red , or raspberry pi but i didn't get a good result.

the second question is it expensive to do it like this ? I mean saving data on the contact how much does it cost?

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Yes, create a transaction(function call) using web3 javascript library.

the second question is it expensive to do it like this ? I mean saving data on the contact how much does it cost?

It's expensive. so I recommend testing it on private network.

If you run ethereum node at rasberry pi, it requires 2GB RAM.

and it makes device warm. I recommend running private servers on PC.

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  • could you please give an example to see how it works
    – mesh123456
    Commented Mar 18, 2019 at 18:11
  • On the expensive question: It is expensive if you use Ethereum. You may want to consider other blockchains if you have a high transaction volume.
    – Undead8
    Commented Apr 15, 2021 at 14:36

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