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May 31, 2016 · There is a new module, very cheap around 4$( Here). We can call/send sms and normaly connect to the website and surly use MQTT(i will explain why after). The good thing is we don't need to spend more money for use it, there is a antenna and we just need to connect the speakers and a… Three examples included. I2C (Wire library) Wire library currently supports master mode up to approximately 450KHz. Before using I2C, pins for SDA and SCL need to be set by calling Wire.begin(int sda, int scl), i.e. Wire.begin(0, 2) on ESP-01, else they default to pins 4(SDA) and 5(SCL). SPI May 08, 2020 · The code you’re using is written for an Arduino, not a NodeMCU. The Arduino SoftwareSerial library isn’t compatible with the ESP core, so you should use the ESPSoftwareSerial library that is includes as part of the ESP core. However, this wouldn’t be needed if you used the I2C interface on the sensor rather than the UART. Pete.