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Wednesday, 19 December 2012

RO Machine - Part 7

The relay boards are now semi-permanently connected.

I have the data lines connected using the two banks of 8 Analogue pins from the Arduino board. Why is this?

Mainly because i have two relay boards with 8 relays a piece, which each have an individual sense pin.

I also have no need for any analogue input such as sensors, and the Arduino can quite happily repurpose the Analogue pins as regular Digital pins. So the construction and wiring have turned out very nice and neat.

Daily FTS RO Machine.17

Happily, all the relays switch when asked to do so, but at the moment they are powered from the 5v supply from the Arduino itself, which can only cope with so many being switched at once before the current draw becomes too great and it shuts down and reboots!

Fine for doing a dry test run but not practical for the future!

This was to make sure the wiring was OK anyway, i will need a dedicated 5v power supply to provide enough juice to switch the relays adequately.

At the moment i actually have a mishmash of 5v, 12v, 24v and 240v requirements in this build, so I'm leaning towards making a custom power supply that will have one wall socket into a common box with the necessary circuitry inside to create the required voltages for each part of the system. It will certainly be a much neater setup instead of having several wall sockets and power supplies strewn everywhere!

I still need to rig my container up with the level sensors and improve the fluid retention integrity (the taps a bit leaky) and I'm also considering building it into a box type construction, and insulated with some polystyrene, along with the RO unit to protect the both from falling temperatures in the winter months.

I'm happy this project is finally making some decent progress though, but still plenty to go at.

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