ESP-01 is low cost esp8266 module, with built-in WIFI.
It was created as Arduino WIFI module, but It’s more powerful than an Arduino, than now if you need a little module to control a relay or some simple digital datalogger It’s the best solution.
Design and mill PCB: Easy and Cheap (Fritzing) – Part 2 – Renzo Mischianti says:
Arduino Remote/wireless Programming – Renzo Mischianti says:
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