Widget of the Week #1: ESP-01 module

For the first of an irregular series of ‘Widget of the Week’ in which members will share the fruits of their frighteningly serious AliExpress and Banggood habits, I bring you the module that started it all, the ESP-01.  Intended for use in wireless serial applications, hackers soon found that it was field programmable and immensely versatile, not to say powerful – having not just far more memory and a faster CPU than the mainstream Arduinos but integrated WiFi with a pretty comprehensive IPv4 stack. On the one hand it’s somewhat hamstrung by having just three i/o pins but on the other, it…

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