Here is sample code to run on the mega once you have the ESP programmed to type things to the ESP and have it spit back responses. Arduino Mega 2560 is also packed with additional features like Analog Comparator, External Interrupt & Software Interrupt, Power Saving Mode, Inbuilt Temperature Sensor, RTC and more. You can also wire a chip to expand the ports if you needed to. An ESP-01 has one analog input but you would be using the pins on the mega. This board looks like it has a level shifter on it, so it converts the GPIO pin voltages from 5 to 3.3 and back. In this configuration, I can program the Mega as much as I want and run my sketches. The picture below with a regular mega and an ESP-01 is an exact equivalent of what the Mega WiFi can do where I connect the mega to my laptop and the Mega talks to the ESP through Serial3. For my needs, I wanted to have the "special mode" with 1, 2, 3 and 4 on which connects the USB to the Mega as it would normally be and with the toggle switch to Tx3/Rx3, connects the ESP to hardware Serial3 on the Mega.
#Arduino mega pinout serial
So fiddling with the switches lets you program one or the other or run connected to the USB for using the serial monitor. The UART for your serial port (hardware Serial) can connect to the mega or the ESP.
If you switch them all off, they are disconnected completely from each other and you can use the male pins near the switches to connect to the ESP8266. It is two separate circuits linked with those 8 dip switches. The processors are the same, 16MHz, and one great advantage of these models is the high amount of IOs. So, feeding the Arduino is already feeding the ESP, which is already down to 3v3, and internally that microcontroller is already 3v3. The power in the RobotDyn is 7 to 12 volts, and the ESP8266 is already powered, and already has a voltage reducer. This is wonderful, since the traditional Mega Arduino has only 256kb of memory.
We can see, then, that the intention of the RobotDyn creaters was to maintain the architecture of the ATmega.Īs we see in the table above, the ATmega has 32MB of memory, not counting the ESP memory. I particularly like the more compact option, but the power is the same in both. However, in the RobotDyn, we have the mini-USB. We can see that they are similar, but in the 2560, we have the USB printer, which is a large connector. Here, we have a comparison between the Mega Arduino with the integrated ESP (Arduino Mega RobotDyn) and the traditional Mega Arduino (Arduino Mega 2560).
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