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Choosing hardware for IOT nodes

I am working on an IOT project with 3 nodes that need to work with BLE. I am wondering how to best choose the hardware. 2 of the nodes need to continuously sense and report to the central node via BLE and the other one takes one reading per hour and goes to sleep.

So what I am thinking is, maybe I can use 4 ESP32 boards since it comes with BLE included, or I can get very cheap microcontrollers + something like HM-10. Both these options seem like a lot of money to me since this is a pet project and I live in Sri Lanka.

Is this the normal way to go, or is there some other cheaper way I'm missing.

submitted by /u/Commercial_Fail_6480
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