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Question Joshua Tree Attenuator Not Working - No relay clicks, doesn't appear to have power leaving the volume
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gjgille  
#1 Posted : Tuesday, March 17, 2020 1:09:31 AM(UTC)
gjgille

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Assembled a JT attenuator. There is 5v going to the volumite from the relay driver, but doesn't appear to be any change in voltage when measuring DC at SCL or SDA. I have two volumites that I purchased about the same time and both are having the same symptoms. I also tried changing out the relay driver, but still nothing.
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Brian Donegan  
#2 Posted : Tuesday, March 17, 2020 6:03:29 PM(UTC)
Brian Donegan

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You will not be able to measure anything useful on the SDA and SDL lines with a voltmeter. These are data lines, and you would need a scope.

Can you post a picture of your setup? Mainly the Volumite, Relay Driver and connections to the relay board.
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gjgille  
#3 Posted : Tuesday, March 17, 2020 6:40:00 PM(UTC)
gjgille

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Originally Posted by: Brian Donegan Go to Quoted Post
You will not be able to measure anything useful on the SDA and SDL lines with a voltmeter. These are data lines, and you would need a scope.

Can you post a picture of your setup? Mainly the Volumite, Relay Driver and connections to the relay board.


Driver.jpg (322kb) downloaded 6 time(s). Relay Board.tiff (306kb) downloaded 9 time(s).

Attached are the pictures. The relay board is in another chassis. I checked continuity between the ribbon cable and seems to be right.

Greg
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Brian Donegan  
#4 Posted : Tuesday, March 24, 2020 5:54:47 PM(UTC)
Brian Donegan

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A few things:

  • Make sure you have J1 installed on the relay board.

  • On the Volumite, you either need the voltage regulator installed, or a jumper between pins 1 and 3, otherwise the power is not reaching the firmware chip. I recommend installing the voltage regulator.

  • Also, I can't tell from the pictures, but you should have the 3.32K pull-up resistors installed on the Volumite.
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