Hi @Bob_Steers + @Elco since my first post things have gotten stranger.
Prior to trying to get the SparkPin-outs to fire the Pump SSRs (2 of), the OneWire SSR expansion board in the 2nd enclosure was able to switch on both of the 40A SSRs intended for the HLT and BK elements and relay the 3 DS18B20 sensors (from Brewpi/store). It was all working.
Since putting the Spark 3 back into its case nothing is working. The spark finds each block as before but can’t read the sensors (OneWire Sensor could not be read), and the digital actuator widget for the SSR expansion board just spins constantly and never get a status from the board.
So following a standard debug process I’ve rebuilt the Pi image using a faster card, deleted all the blocks, reflashed the Spark, swapped from WiFI to ethernet, tested all the cables (pair 2 is dead on both sets, is that by design?), and have finally managed to get closer to working out what the problem is by starting from scratch again and adding one device at a time.
It turns out that I can only get a temp signal from 1 sensor at a time. If I plug a second one in I lose the them both. If I have 3 plugged in, the Spark detects all three but can’t read from any of them. If I pull two out, the third comes alive, and it doesn’t matter which one I pull out, I can bounce from one to the other. If I add an SSR expansion board, the Spark finds it, but never get’s a status update from it and can’t switch it on/off either.
Power. I’m using the 12v pack I bought with order# 100004441, plus I have a clone Rpi power pack for the pi too. I was using a 2.4A Anker USB charger, but swapped it out for the 2A wall pack that came with the Pi3 kit yesterday. And good cables too, from the Brewpi store.
So here’s the logs for your to have a look at plus 3 photos showing the chain of events when trying to add 2 sensors to the spark. https://termbin.com/iy1i
1.) Single sensor named HLT
2.) 2 Sensors plugged in (a short Air Temp sensor and a kettle sensor, both from the BrewPi store). The first one in the shot above stops working.
3.) Pull the first HLT sensor and the ‘air temp’ sensor comes alive again.
Thanks in advance.
PS: I repurposed the SSR expansion board I was planning to use for the fridge hack to work around the SparkPin issue so ordered a new SSR expansion board yesterday and it arrived this morning, so thanks for that. 
