Hi Guys,
I would like to ask regarding how to use LoRA Ra-02 with arduino uno 3. I am a bit confused because some guides does not use a logic level converter for the LoRa Ra-02 and some have used it. How do I know if I need to use a logic level converter? and will it work without using one?
Thank you
Whenever connecting a 5V output to a 3.3V input, a logic level converter is required.
It is also a good idea going the other way, as 3.3V outpout signals may not be properly detected by 5V inputs.
The best approach is to use 3.3V Arduinos with 3.3V modules like sensor and radio modules, because 5V logic will soon be completely obsolete.
Blockquote
The best approach is to use 3.3V Arduinos with 3.3V modules like sensor and radio modules, because 5V logic will soon be completely obsolete.
What are 3.3V arduinos? I am sorry I am very new to this things. I believe Arduino uno 3 is 5V?
Thank you
Lots of Arduinos run on 3.3V, including most of the new ones with ESP32, RP2040 or SAM processors, and some run on even lower voltages. That is the direction in which the world is moving: less operating power consumption, but much higher processing speed and much more memory!
The Arduino Uno R3, Mega, Classic Nano and Pro Mini are quite old and very limited designs that ran at 5V (although the processors all work fine on 3.3V power).
I don't think there are any advanced radio modules that run on 5V (the really cheap 433 MHz modules are an exception), so if you are interested in radio applications like LoRa, consider the Arduino-compatible Adafruit Feather boards, which have the processor and radio module combined on one small board, which could also be the brain of a complete robot.
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Thank you that really helped a lot. So in my case I need a logic level converter with arduino uno 3 and Ra-02. right?
Yes. I recommend a general-purpose bidirectional converter like this one, which is the most versatile: