RS485 shield with Arduino UNO

Using Arduino Avrdude, stk500, Bootloader issues
1

Using Arduino UNO R3 with RS485 shield gives loader errors even for blink.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x4a
etc...

Without the shield no loader problems.

However using Arduino UNO R4 Wifi with the RS485 shield loads as expected.

So I expect that the RS485 shield from DFRobot V1.0 is NOT compatible with the UNO R3.

Has anyone got the RS485 shield from DFROBOT V1.0 up and running with Arduino UNO R3 ?

2

please provide a link to the documentation you are using for your DFRobot V1.0 device.

1 Like
3

And I suspect that the shield is currently using Rx and Tx and hence interferes with the upload.

Uploads for that board work totally different. And I do not think that that board uses Tx and Rx for communication with the PC (I should check the schematic but I'll leave that up to you).

1 Like
4

Thanks, I was reaching that conclusion also, because the shield is tapping in the Rx and Tx.
Now trying to do the upload without the shield following by running with shield, although feels crazy...

5

If you provide the info requested by @Paul_KD7HB, we can be sure what you have. If it's https://www.dfrobot.com/product-1024.html, note the quoted text

6

Yes thanks for pointing this out to me, so for programming you need to flip the switch!
Now it works!