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Forum Index : Microcontroller and PC projects : I got aome JDY-41 to play with...

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Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6655
Posted: 12:55pm 25 Oct 2024
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Totally different. :)  It can't connect to a router and it can't talk to BT.  :)

It can do something really cool though. When acting as a remote control receiver you can connect up to 8 LEDs (or opto couplers) to it and control them remotely. No CPU needed for that, it's built in.

Acting as a remote control transmitter it can have 7 or 8 buttons and draws virtually nothing if no button is pressed. Once again, no CPU needed.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
Justplayin

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Joined: 31/01/2014
Location: United States
Posts: 326
Posted: 01:33pm 25 Oct 2024
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I have wired up a proof of concept garage door monitor using a pair of modules in remote control mode.  Worked just as planned EXCEPT for the range.  Ordered some new modules with external antenna connectors and several types of antennas.  I just need to get motivated and solder up a new set of breakout boards to test. 🥴

--Curtis
I am not a Mad Scientist...  It makes me happy inventing new ways to take over the world!!
 
Mixtel90

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Posted: 02:08pm 25 Oct 2024
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The JDY-41 is supposed to have a longer range than the JDY-40. It will probably lose signal more sharply though as the ACK system supposedly prevents malformed messages.

We can't legally use the external antenna version in the UK. We can't use any sort of antenna with gain in that band. On top of all that, we are also limited to 1/10 of the transmit power allowed in the US IIRC. We do get channel 13 though, which overlaps into military frequencies in the US so don't go there! (That's the band plan channel 13, not the JDY channel 13).
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3774
Posted: 02:09pm 25 Oct 2024
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  Mixtel90 said  It can do something really cool though. When acting as a remote control receiver you can connect up to 8 LEDs (or opto couplers) to it and control them remotely. No CPU needed for that, it's built in.

Acting as a remote control transmitter it can have 7 or 8 buttons and draws virtually nothing if no button is pressed. Once again, no CPU needed.

Ooh, that DOES sound cool - thanks.

John
 
Mixtel90

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Joined: 05/10/2019
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Posted: 02:18pm 25 Oct 2024
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The JDY-40 and JDY-41 are hardware compatible too. You can often test an idea using the JDY-40, which is relatively easy to configure, then swap it for a pre-configured JDY-41.

The manuals are not the greatest though. They've tried, but there is essential info missing or things not properly explained. I think the JDY-41 one might be slightly better. If you are going to play with both then you need both manuals though.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 787
Posted: 02:36pm 25 Oct 2024
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OK I'm sold but you need to quit dilly-dallying and get the comm's figured  

Man, aren't these just GREAT times?

All we need to be is imagineers anymore. We can accomplish anything

 
Mixtel90

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Posted: 06:37pm 26 Oct 2024
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I got it to talk to me! :)
To get it to return the parameter string:

Print #1, Chr$(&hAA); Chr$(&hE2)

You don't need to add CRLF as that happens anyway when sending a string.

Things are looking up. :)
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
PhenixRising
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Joined: 07/11/2023
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Posted: 09:18am 27 Oct 2024
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Cool....I wonder how long these things will run on something like a CR123.
 
Mixtel90

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Posted: 10:27am 27 Oct 2024
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It depends on what you are doing. :)

If it's a simple remote control transmitter
Standby (no buttons pressed) = 10uA
While transmitting = 40mA

If it's a stand-alone remote control receiver
Continuous Standby = 24mA (I think I've seen this measured as lower)
However, if it's MCU controlled you could raise CS when it's not needed and drop the standby to 10uA, but you can't receive then, of course.

As a transparent serial device it's always going to have a MCU so the power is largely irrelevant, I suppose.

I'm guessing that the transmit current is based on max power output. However, the transmission mode is pulses no matter how you use it, I think, so it could be an average. You will almost certainly need some sort of cap on the supply rails, even if it's not very big.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
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