ESP-01 AARRGGHH!!!!

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Mixtel90 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 9202	Posted: 08:22pm 24 Sep 2021       The CMM2 can't connect to wi-fi without something like that.  :)  The ESP-01 is basically an interface block to connect a serial port to wi-fi. That's why it uses AT commands by default - it looks like a modem. The ESP modules are clever, but it all depends on what you want to do. They have limited I/O because they are actually microcontrollers. Linking them to something like a CMM2 opens up a lot of possibilities that they couldn't do otherwise. An ESP-01 only has 4 I/O pins and you have to be careful how you use IO2. IO1 and IO3 are usually used for the serial TX / RX. You could use I2C to expand the I/O on an ESP-01 though.