Communicating between two Arduinos using software serial

Connecting two Arduinos for serial communication is super straightforward! Start by hooking up pin two from one Arduino to pin three on the other, and don’t forget to do the reverse too.
It’s really important to link their grounds for everything to work smoothly.
Since this is more of a software connection, you’ll want to use software serial to manage those UART pins through GPIO.
Just remember, designate pin two as RX on one Arduino and TX on the other, while pin three takes on the opposite roles.
This cool setup lets the two Arduinos chat away, using those GPIO pins for data transmission..

So, in this project, we’ve got one side sending packets nonstop while the other side is on the receiving end.
To make this happen smoothly, we use the software serial library, which is super handy for serial communication on different digital pins—perfect for when you need multiple connections.
Just a quick tip: make sure you cross-connect the RX and TX pins correctly—like pin two on one Arduino goes to pin three on the other, and you flip it for the reverse.
Also, keeping that baud rate at Serial.begin(5600) is key, especially since the sender is busy sending out code every three seconds to keep everything running smoothly.
Following these steps is crucial if you want to hit that sweet spot without running into errors..

So, here’s what’s going on: the code’s all neatly organized, and we’ve got these macro constants set up for both the roll sender and receiver.
Right now, the roll macro constant is sending out data, but if needed, you can switch that up in the software serial settings without a hassle.
I’ve also declared the instance, assigned the RFC TX pin to two and three, and set the baud rate to 9600—plus, I made sure to establish a buffer and data format.
The sender kicks off communication by sending out data packets, and the receiver hangs tight, checking these packets for integrity based on their length.
It’s definitely a good idea to include integrity checks to make sure everything’s being transmitted correctly..

Alright, let’s dive into how Arduino communication really rolls! So, when you check out the serial monitor, you’ll notice that the output shows up as hex values.
This makes things super easy to read, allowing the device to either send or receive based on what the code is doing.
After I uploaded code to the sender, I switched it to a receiver and did another upload—thankfully, everything is clearly labeled, so it’s easy to keep track.
With the USB cable powering both devices, the sender shoots out packets to the receiver every 3 seconds, and the info pops up on the screen with nice timestamps.
In today’s session, we set up two Arduinos where one sends the packets and the other receives them.
Next time, get ready, because we’ll tweak the receiver’s code to extract and showcase specific details from those packets!.