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esp8266 is not even close to being a replacement for rPi. The specs are orders of magnitude worse. 160KB RAM, 1MB flash, 80MHz CPU, no GPU. None of the builtin modules for networking, wifi, etc.

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I think I agree that there really isn't a comparable competitor to rpi .. rpiZero W offers a lot for an iot module at such a great cost. maybe something like the CHIP, but not even?

I'm currently working on an agriculture sensing iot platform and going to try to use rpiZero W with the current spectrum sensor from nanolambda. http://www.nanolambda.net . luckily they have the rPi api,sdk already.

What do you mean? There are tons of rPi alternatives.

https://www.board-db.org/

I think some of the Orange and Banana Pi computers would be roughly comparable, if you don't mind the Allwinner chips.

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