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CircuitGizmos

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Posted: 06:39pm 12 Oct 2020

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There was a thread (I can't seem to find it) that seemed to have a lot of information on HC-12 communication. It listed the basic AT commands needed to set up a module-to-module serial communication. Basically a simple transparent wireless serial cable. I'm looking for just a simple example.

I can't seem to find that thread, or notes.

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JohnS
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Posted: 07:03pm 12 Oct 2020

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Might be
here

Or
here

John
Edited 2020-10-13 05:05 by JohnS

CaptainBoing

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Posted: 07:12pm 12 Oct 2020

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or here - this is the famous thread in which Grogster tracked down the rogue 30MHz crystal and his escapade made it onto hackaday

https://www.thebackshed.com/forum/ViewTopic.php?TID=10443&P=1

contained within is another fab link which shows how to use cheapie SDR USB modules (circa �15 on eaby) as a poor man's Spectrum Analyzer... ish
Edited 2020-10-13 05:14 by CaptainBoing

CircuitGizmos

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Posted: 07:16pm 12 Oct 2020

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Somewhere I remember reading that the set pin could be left floating (after initialization?) and the device would be in data mode. Is this true?

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lizby
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Posted: 07:52pm 12 Oct 2020

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Does it have to be HC-12? ESP8266 with ESP-Link has pass-through mode.

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CircuitGizmos

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Posted: 07:58pm 12 Oct 2020

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lizby said Does it have to be HC-12? ESP8266 with ESP-Link has pass-through mode.

Thanks, I'm doing that, too. And HC05.

I'm putting the HC-12 module on a RetroMax to replace the console connection. The RetroMax supports the HC-12 and HC05 right there.

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CircuitGizmos

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Posted: 07:59pm 12 Oct 2020

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And note I left the set pin floating. I don't know where my notes are, so I'm recreating the process I went through and verifying it on the hardware.

https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=12912
Edited 2020-10-13 06:00 by CircuitGizmos

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Chopperp

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Posted: 08:03pm 12 Oct 2020

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CircuitGizmos]Somewhere I remember reading that the set pin could be left floating (after initialization?) and the device would be in data mode. Is this true?

I leave mine floating. Work OK.
Edited 2020-10-13 06:05 by Chopperp

ChopperP

CircuitGizmos

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Posted: 08:08pm 12 Oct 2020

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Chopperp said CircuitGizmos]Somewhere I remember reading that the set pin could be left floating (after initialization?) and the device would be in data mode. Is this true?
I leave mine floating. Work OK.

I'm missing my folder and notes about the HC-12. So that is exactly what I am asking and/or verifying.

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Chopperp

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Posted: 08:26pm 12 Oct 2020

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In this post
Here
Grogster has written some code (at the end) which enables the HC-12 to be programmed in situ. The set pin is tied to an I/O pin for the purpose.
Works well as long as you keep track of the baud rate last used.

Brian

ChopperP

CircuitGizmos

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Posted: 08:33pm 12 Oct 2020

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Thank you, Chopper!

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Grogster

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Posted: 04:11am 13 Oct 2020

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Yes, you can leave the SET pin floating. I believe the HC12 has an on-board pull-up for this pin, to hold it high. You pull the SET pin LOW to enter the setup mode.

Robert Rozee wrote a nice little GUI for talking to the HC12 module. I will ask him to post it here.

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robert.rozee
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Posted: 12:57pm 13 Oct 2020

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the latest version of the utility (for win32) can be downloaded from the document register, here:
http://www.thebackshed.com/docregister/ViewDoc.asp?DocID=16

and the HC-12 datasheet can be downloaded from here:
http://www.thebackshed.com/docregister/ViewDoc.asp?DocID=18

cheers,
rob :-)

CircuitGizmos

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Posted: 02:11pm 13 Oct 2020

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Thank you Rob! (and Grog!)
Edited 2020-10-14 00:12 by CircuitGizmos

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CircuitGizmos

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Posted: 06:36pm 13 Oct 2020

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I want to make a correction for the record. In my haste to post a little picture of the wireless console link, I plugged the wrong HC-12 module in the RetroMax to take a quick photo. The earlier picture is upside/backwards/inverted/insideout or something.

Here is the correct HC-12 module orientation:

What it looks like soldered into a case:

Edited 2020-10-14 04:47 by CircuitGizmos

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