Lora EEbytes radio Arduino Mega issue

Projects Networking, Protocols, and Devices
1

So I am using 1 arduino uno and 1 arduino mega and 2 Lora E32 radios. The mega can send messages but cannot receive them from the uno. The uno can receive messages from the mega. Now i can move the tx and rx to different pins from 2,3 to 16,17 and 18,19 and still have the same issue. Now at this point I can replace the mega with another uno and communications works both ways no problems at all. I am using the Ebyte Lora E32 library. The same code on all three boards and same circuits, using level shifters as well. So I can again just replace the mega with the uno and it works great, using the exact same pins 2,3. Please help.

2

sounds like you have poor connections
I assume you are using a breadboard with jumper wires - can be a source of poor interconnections and intermittent problems - can be very difficult to find and fix problems
I tend to use microcontroller modules with onboard LoRa, e.g. TTGO LoRa32 SX1276 OLED Board or at a minimum use a microcontroller which uses 3.3V logic removing the requirement for level converters

3

Sounds like your using softwareserial on the Mega, which is odd, given that the Mega has 3 spare hardware serial ports.

Software serial also wont work for RX on Mega pins 2,3,16,17,18,19 ......

4

Thanks so much for the response but I do not think its a loose connection. I can remove the wires from the uno and put them in the mega and it does not work, i can then replace the mega with the uno and it works. I am using a breadboard but the wires I move back and forth are going into the connectors on the boards. Is there something about the mega that could be causing this issue ?

5

Yes.

The problem was detailed in post #3.

1 Like
6

Thanks again I did not see post #3. So for various reasons I have required to use the hardware serial pins 18,19. However the available libraries will not work for those pins. Even if I do not use software serial use the code for the hard-wired serial. How would I integrate the serial1 into the library, /www.mischianti.orgc?

7

you could try using a constructor such as

LoRa_E22 e22ttl(&Serial1, 3, 4, 5); //  RX AUX M0 M1

set the AUX M0 M1pins to suit your configuration

8

Thanks so much horace, this worked.

9

if the problem is solved click the Solution button at the bottom of the reply that answered the question - this helps others with a similar question

10

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