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I have a small IoT project where I want a network enabled electrical relay. I do not need full network plug nor linux on it. It just should be small and cheap. I feel smart enough to write a small http server in C/C++ (if required) to change the state of the relay. I searched of cause the web and found the almost matching dublicate Cheap IoT microcontroller with PoE

However this is much bigger then what I have in mind. I want a small board with 6 skews to mount the wires (2 or more replays would be fine too). I want to control a device for with less then 25V (I'm not sure but very likely 12V DC). However I do not want to write the TCP/IP stack by my own.

Any ideas?

rekire
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1 Answers1

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Well, I am a big fan of the Omega 2, which is not much bigger than a full size SIM card or SD card. It runs Linux, so there is your TCP/IP stack.

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It has a good spec and will set you back a whopping $13.

580MHz MIPS CPU
128MB Memory
32MB Storage
USB2.0 support
2.4GHz b/g/n WiFi
3.3V Operating Voltage
18 GPIOs
Support for UART, I2C, SPI
MicroSD slot

Just by coincidence, I received their newsletter about 20 minutes ago and it describes a PoE project.

That will set you back another few bucks, so I will leave it to you to decide if it is "cheap". Hope this helps.

Mawg
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