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Forum Index : Microcontroller and PC projects : I got aome JDY-41 to play with...
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6655 |
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 |
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Justplayin Guru Joined: 31/01/2014 Location: United StatesPosts: 326 |
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!! |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6655 |
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 |
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JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3774 |
Ooh, that DOES sound cool - thanks. John |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6655 |
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 |
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PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 787 |
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 |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6655 |
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 |
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PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 787 |
Cool....I wonder how long these things will run on something like a CR123. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6655 |
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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