OSC PID debug light is blinking

[rhagerbaumer]

I'm having a hard time getting my 7 segment displays to work. I have two of them - 1 for the HLT and 1 for the Mash Tun temps. I wired them according to the advice from the guys at oscsys -

------------

The pins on your BCS you are going to use are the following. What I would recommend is to just get one of course I2C cables and snip the end off to make a nice and easy connection.
BCS – I2C PID
=========
+V - 12V
-V - GND
Exp0-SCK
Exp1-SDA

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The displays are powered.
The BCS firmware is 3.4.5.
I set the PID addresses to 2a and 2b.
I set the BCS systems settings for Temp0 to 0x2a, Temp1 to 0x2b.

The PID debug light blinks, which according to the OSC documentation indicates:
"The Debug LED serves as an indicator of board status. When flashing it means the board is
running properly but not receiving any data"

[JonW]

You also need to tie the LCD ground to the BCS ground.

[rhagerbaumer]

Sorry Jon, I'm not following.

On the "I2C Communications Port" there are the following:

1. SDA
2. SCL
3. N/C
4. 12VDC
5. GND

Are you saying (5. GND) has to be tied to one of the BCS GND terminals instead of -V from the 12V power supply? Or is there another pin?
X2 – Aux Power has
1. GND
2. 12VD
But I don't think I need that because I only have 2 displays chained.

Thanks for helping a newbie!

[ECC]

Yes, all grounds need to be connected together. Connect BCS GND, I2C Comm 5. GND, and 12v power supply -V

[rhagerbaumer]

Thanks! I've tied the grounds together. The debug light is still blinking... it's perplexing! I'm open for more suggestions! I'm wondering if I'm missing a terminator or something.

[JonW]

Double check that you're not still running 3.4.4 - the expansion port was broken in that build.

[rhagerbaumer]

Thanks Jon. Unfortunately I'll have to pursue this after Christmas.

[rhagerbaumer]

On a fluke, I swapped the SDA and the SDC to EXP0 and EXP1 respectively. It is now working, so I'm happy, but I'm also a bit confused.

[JonW]

Hmmm... I think the Wiki is wrong. Mine is wired the same as yours.

Glad you got it solved!

[ECC]

The problem turned out to be incorrect markings on the pid display card itself. All of the documentation was 100% correct (which is what is reported in the thread above). However I think he followed the silkscreen on the card which is NOT correct.

I've send an email to oscsys about this, and will make a note in the wiki so others aren't confused.

Just to be clear, the ordering of the pins on the OSCSYS PID Display Module are:
1. SDA
2. SCL
3. N/C
4. 12VDC
5. GND

http://www.brewtroller.com/downloads/piddisplay.pdf