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Quazee137

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Joined: 07/08/2016
Location: United States
Posts: 600

Posted: 12:30am 31 Jan 2019

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I got four of the HC-12's wired two of them up on two breadboards with power.
USB to serial RXT > TX HC and TX > HC. "SET" pins to ground. I plugged them
into two computers running minicom 8N1.

When I press "A" to start the "AT" I get "ERROR". Does this on both computers.
So I played with minicom settings keeping baud at 9600 went through all
permutations of bits, parity, stopbits. Still prints ERROR at 1st key press.

Even tried 3 different USB to serial cables / modules.
Then tried the other two HC-12's with same results.

Now wondering did I get bad HC-12's

Anyone else have this happen?

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9754

Posted: 12:52am 31 Jan 2019

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[Quote]"SET" pins to ground.[/Quote]

That's your problem. You ONLY ground the SET pin, to configure the module - channel and output power, FU mode etc.

Remove the ground references on both module's SET lines, and try again.

Smoke makes things work. When the smoke gets out, it stops!

Quazee137

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Joined: 07/08/2016
Location: United States
Posts: 600

Posted: 02:23am 31 Jan 2019

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I was trying to configure them. Well I thought I was then remembered
rob's HC-12 graphical configuration utility.

Using wine I had to start it up then the new wine makes a bunch of com links
had to

rm -i ~/.wine/dosdevices/com1
ln -s /dev/ttyUSB0 ~/.wine/dosdevices/com1

went back to HC config and clicked "OK"
every thing just works now. Thanks rob.

I have two setup as a repeater one at my desk and one with a 170BP for testing
now I need to get eight more to do a real field test.

rob a though for an SC project a 170 backpack with the configuration algorithm
as a way to set these up on the fly in the field.

one more
Where the HC-12 text is make way to select other RF "AT" based modules.
add a few different sockets for them even 3.3V <> 5V

Grogster could do a board.

Thanks rob and Grogster
Edited by Quazee137 2019-02-01

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9754

Posted: 06:36am 31 Jan 2019

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Do you think that perhaps Linux was interpreting the AT commands as some kind of internal Linux command thing?
Seems rather unlikely, but....

Tell me more about the board. I would be interested in doing one, if anyone thought it would be useful.

Smoke makes things work. When the smoke gets out, it stops!

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