![arduino mega serial port arduino mega serial port](https://crazymike.at/wp-content/uploads/2019/11/ArduinoNodeSerialESP8622.jpg)
RX : TX2 connected to the MEGA via a Level Converter.TX: that it will be connected to RX2's MEGA (can be connected directly, since MEGA has no problem understanding 3.3V as HIGH).
![arduino mega serial port arduino mega serial port](https://i.stack.imgur.com/Nwb1D.jpg)
Not always the Arduino can supply the required current for the correct module operation. Another important point is to have an independent source of 3.3V. The input pins also do not support 5V and when receiving an Arduino signal, it is important to use first a "voltage level converter" (cute name for the good and old resistors voltage divider).
Arduino mega serial port how to#
Several posts at internet explain how to do it. Perfect! But how to do in the case of ESP8266 come programmed at a faster rate? The way is to reprogram it, of course! BUT, not all Firmware that is loaded into from factory, accept reprogramming module. This works OK as long as the transmission speed is less than 19,200 baud. The solution for Arduino UNO is to use the "SoftwareSerial" library to designate other two generic pins (GPIOs) to be used as a serial port (SW).
Arduino mega serial port Pc#
The problem is that the PC Serial Monitor also use the same serial port (PC is used here as a generic term, but I hope my Mac does not listen to me -). Sometimes this is complicated, as in the case of Arduino UNO, once only for HW Serial "0" (pins 0 and 1) can work at that speed.
![arduino mega serial port arduino mega serial port](https://docs.arduino.cc/static/39c3711702659b40c1148a6d247693e1/29114/circuit.png)
In general, the module comes from manufactures speaking at a 115,200 baud rate. Well, the first thing you have to do is test the module with AT commands, which is the standard of communication.
Arduino mega serial port install#
Until today, I only studied the ESP8266 connected to the Arduino, replacing the need for a relatively expensive Wifi shield (Shield, is a PCB that you install at a top of an Arduino to expand its capabilities). The above spec includes a lot of technical stuff that you do not really need in the great part of your projects, but it is good to have a hand "just in case".