![]() ![]() It includes digital input/output pins-54, where 16 pins are analog inputs, 14 are used like PWM outputs hardware serial ports ( UARTs) – 4, a crystal oscillator-16 MHz, an ICSP header, a power jack, a USB connection, as well as an RST button. When you type the letter a on the text window the computer sends it to the Mega then the Mega sends it to the UNO (Adafruti Metro 328) then the UNO (Adafruit Mero 328) sends it to the Leonardo to turn ON the LED on the Leonardo.The microcontroller board like “Arduino Mega” depends on the ATmega2560 microcontroller.Whe you type the letter b the LED goes OFF. Open the Serial Monitor use 9600 baud speed, when you type the letter v on the text window the LED on the UNO (Adafruit Metro 328) goes ON.On the Arduino Mega UART3 code IDE make sure your Mega comm port is selected.connect Leonardo and UNO (Adafruit Metro 328) to a reliable power source.connect ALL 3 Micros ground pins together.connect pin15 RX3 on the Mega to pin1 TX on the Arduino UNO (Adafruit Metro 328).connect pin14 TX3 on the Mega to pin0 RX on the Arduino UNO(Adafruit Metro 328) this is for Hardware Serial UART.connect pin8 RX on the Leonardo to pin9 TX on the Arduino UNO(Adafruti Metro 328) this is for Software Serial.connect pin9 TX on the Leonardo to pin8 RX on the Arduino UNO(Adafruit Metro 328) this is for Software Serial.Upload Arduino UNO UART_SoftSerial code to the Arduino UNO(Adafruti Metro 328).We just need to upload the new program to the Arduino UNO (Adafruit Metro 328).To save time and energy, the Mega keeps the same program and the Leonardo keeps the same program from the last example.You'll thank me later when the issue arrives. Well, … my little programmer, not ALL shields or sensors are compatible with the Mega that's why were are going to connect the Arduino UNO (Adafruit Metro 328) as an In-between microcontroller just for this reason. You may be wondering why would you want to do that?!?!īecause you may find yourself in a situation where your using your default hardware UART for a device and then you need another UART connection this is where you use the software serial on the same board!!!. The code on the Leonardo remains the same as the previous example. Same thing happens as the other example we only used UART #3 on the Mega. In this code we use UART3 on the Mega to communicate with the Leonardo. This is the Arduino Mega Code UART1 void setup() On the Top window in the text box enter the letter a … not the capital A … the LED on the Arduino UNO(Adafruit 328) goes OFF.On the Top window in the text box enter the letter x … not the capital X … the LED on the Arduino UNO(Adafruit 328) goes ON.On the Arduino Mega UART1 program window of the Arduino IDE, make sure your COM is selected to the Arduino Mega before opening the Serial Console, Open the Serial Console set to 9600 baud COM Speed.Connect Arduino Mega to the Computer from the USB cable.Connect Arduino UNO to a Stable/Reliable power source.Connect the ground pin on the Mega to the ground pin on the Arduino UNO(Adafruit 328).Connect one end of a wire to Mega's pin18 TX1 and the other end to Arduino UNO's(Adafruit 328) pin0 RX.Connect one end of a wire to Mega's pin19 RX1 and the other end to Arduino UNO's(Adafruit 328) pin1 TX.Upload the the codes to Arduino Mega and Arduino UNO(Adafruit 328).MEGA to Adafruit 328(Arduino UNO) UART to UART connection. The Leonardo will use the SoftwareSerial example but if using the UART same will apply as the Arduino UNO's. This will not allow the Arduino UNO(Adafruit Metro 328) to communicate with the outside world AKA your computer. Please follow this step because your Arduinos use the "DEFAULT" SerialPort to upload your code from the Computer, once you make the physical wire connections the "Default" SerialPort will be used on the Arduino UNO (Adafruit Metro 328) to communicate with the Arduino Mega 2560 R3's SerialPort #1 which is pin19 RX1 and pin18 TX1 on the Mega. The connections will be UART to UART, SoftwareSerial to SoftwareSerial, UART to SoftwareSerial, and ALL 3 connected together!! :)īefore you make the physical wire connections. If you ever wonder how to use the other Serial ports on the Arduino Mega 2560 R3, but don't know where to start? This short tutorial we'll go over the basics, we'll connect to an Adafruit Metro 328 = its an Arduino compatible works just like an Arduino UNO R3, and we will connect to an Arduino Leonardo clone. This tutorial we are covering Serial Port Basics on the Arduino Mega 2560 R3. ![]()
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