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PeterB
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Posted: 19 April 2018 at 1:14pm | IP Logged Quote PeterB

G'Day Grogster et al
I know it's all done and dusted but it occurred to me that you could have proved your theory by loading the Xtal on the new device to drop it's frequency enough to correct it. A pair of twisted wires cut to length could do it.
Just a thought.
Peter


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VK2MCT
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Posted: 19 April 2018 at 1:26pm | IP Logged Quote VK2MCT

The docs seem to say that the Xtal caps values, can be programmed.
Caps are internal to the brain.
John B

Edited by VK2MCT on 19 April 2018 at 1:26pm
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CaptainBoing
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Posted: 19 April 2018 at 5:16pm | IP Logged Quote CaptainBoing

Grogster wrote:
Well, I have checked my stock, and found seven HC-12's which all qualify as being fakes. I have binned the lot.


hold your horses fella!

It might be they are crap because of some minor error - I know they were cheap but if you can fix them for a couple of smd caps, that's gotta be better. They are evidently close to being functional and the effort to fake something to a working state is considerable.

I would mark them with a big F in a circle on the bag but put them to one side until all avenues have been explored - at least until your new tester is done and you can prove it. for that btw

at 22Yuan from HC, I will probably get mine from then direct now, works out as sub 2.50... why take the chance

Edited by CaptainBoing on 19 April 2018 at 5:21pm
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Grogster
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Posted: 19 April 2018 at 5:25pm | IP Logged Quote Grogster

I hear that, but the issue I have is NOT just the crystal oscillator. If they are clones, then the ST chip will be a clone also, and probably the Si RF chip too.

The PICAXE forums talk about people having issues with their HC12's locking up completely, and they can only get them to talk again by cycling power. These appear to be the clone HC12's.

This to me suggests that the MCU could be quite unstable, depending on what die they have actually used, vs what the genuine HC12's have used. For cloners, every single cent matters, as you probably know.

So, while the crystal oscillator is definetly a problem in the clones, it would also appear that the ST chip is also - cos it too is probably also cloned or some kind of sub-standard version. The cloners may have used the ST rejects for this part to save a few cents, but to cause a whole heap of stress for anyone trying to use them.

Back to my tester PCB layout.

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CaptainBoing
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Posted: 19 April 2018 at 5:40pm | IP Logged Quote CaptainBoing

what price were you paying for HC-12 from your dodgy mate down the pub ?

22Yuan is NZ$4.79 - I have had an epiphany about this - I can't risk being in the situation where I have modules that won't talk to each other. I have evidently been lucky up to this point. From now on, I go to the source. If the real thing cozts me 2.50 and the hooky ones are 99p, that saved 1.50 buys me a whole heap of pain or at least the worry until proved OK.

Not risking it.

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Grogster
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Posted: 19 April 2018 at 6:43pm | IP Logged Quote Grogster

Totally agree, and I would order direct from hc01, but they don't have an English version of their website, so it would be pretty hard to order from them - even though I would like to - cos of the language barrier on their site.

Can you speak Chinese?

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lew247
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Posted: 19 April 2018 at 7:44pm | IP Logged Quote lew247

Grogster wrote:

Can you speak Chinese?


No but CHROME Translated Link can

chrome will translate most languages
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Phil23
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Posted: 19 April 2018 at 7:45pm | IP Logged Quote Phil23

Grogster wrote:
Well, I have checked my stock, and found seven HC-12's which all qualify as being fakes. I have binned the lot.


What a bugger,

I went for HC-11's a few years back cause I read something about timing issues; well watched on YouTube.

They are working fine, but the range sees one up the front office being deaf occasionally.

Figured on all the latest reads that I could just grab a dozen HC-12's & swap them about & still have 1/2 a dozen to spare.

Got cold feet now. Just hate how these FAKE copies pop up an don't meet the mark.

Phil.
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Azure
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Posted: 19 April 2018 at 7:48pm | IP Logged Quote Azure

A lot of the content on HC01 uses images (text saved as gifs or other formats). The translators for Chrome and Edge, etc cannot translate the image parts of web pages.

I checked out the HC-2 specs and there are a lot of images on there, the text parts get translated but not the rest.
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Grogster
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Posted: 19 April 2018 at 7:50pm | IP Logged Quote Grogster

Yes, I had that problem too.

I did try Mr. Translate on that site, but it is still pretty much unreadable - to me.

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Posted: 19 April 2018 at 7:54pm | IP Logged Quote Grogster

Phil23 wrote:
Figured on all the latest reads that I could just grab a dozen HC-12's & swap them about & still have 1/2 a dozen to spare.

Got cold feet now. Just hate how these FAKE copies pop up an don't meet the mark.

Phil.


You can, if you get the genuine ones. The cloners don't clone stuff to be competitive, they clone stuff to get your money. They really don't care if they actually work right or not, the object is to get you to part with your cash. Sad, but true.

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MicroBlocks
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Posted: 19 April 2018 at 10:56pm | IP Logged Quote MicroBlocks

Note to self.... When ordering from ebay, aliexpress,banggood etc. Check if everything works once received.
Then still have time to file a complaint and get your money back.


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