Using TTL to RS-485 Converter with Arduino

Let’s talk about setting up your TTL to RS-485 converter with Arduino! We previously introduced RS-232 and RS-485, and now we’re diving into using the TTL to RS-485 converter.
For this, we’ll be using Device Mod’s converter, which is perfect for Arduino communication.
When it comes to connections, you’ll want to hook up VCC, TXD, RXD, and GND, and it’s compatible with both 5V and 3.3V systems.
For your wiring, cross-connect the converter’s RXD to pin three on the Arduino and TXD to pin two.
You’ll notice RS-485 has A and B labels, so connect A to A and B to B on your devices.
And don’t worry about connecting the ground when you’re using RS-485! A simple example setup could include three Arduinos hooked up to the RS-485 converter..

So, here’s the deal: each converter is designed to connect the A lines and the B lines together, just like what you see in the diagram.
In our setup, we’ve got an Arduino linked up to a three-color LED and a button, using the same method shown in the circuit diagram.
The RXD and TXD pins play a key role here; pin 2 for RXD hooks up to TXD on the RS485, while pin 3 for TXD connects to RXD.
As you’re testing everything out, you’ll notice that different numbers sent will display different colors: zero means red, one is for green, and two lights up blue.
This entire communication magic happens through button presses that activate the right colors, and if you’re curious about the code, you can grab it from the provided URL..

Let’s dive into the RGB color control scene! So, in the ID section, you’ve got values that you can tweak, with zero representing red, one for green, and two for blue—these correspond to a three-color LED.
Whenever you press the button on pin 8, it sends its ID value, making the LED show you that exact color.
The system is pretty neat; it reads incoming data and interprets the bytes as colors, matching zero to red, one to green, and two to blue.
Coding this is a breeze since it’s a lot like serial communication.
Plus, if you want to connect to RS485 systems, just link the A and B lines for Arduino communication!.