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Mike / Ray
Thanks for the assistance – yes it appears switched mode power supplies output DC and that was the problem.
I just connected up the power supply from RS and everything is working fine!
Vik
If I need to get another one, will this work?
https://uk.rs-online.com/web/p/desktop-power-supply/9076249/Thanks for getting back to me.
I bought a 24v Switched Mode AC DC Power Supply like this:
https://www.ebay.co.uk/itm/18W-750mA-Fixed-Voltage-24V-Switched-Mode-AC-DC-Power-Supply/282416149933
And then cut the plug off the end and wired it to the board.
Looks like this is the culprit – should a switching power supply work – or should I get another one which is only AC?
OK, I tested the voltage a few further ways:
1. Voltage directly at the board
Switches On, Switches Off, behaves as expected
2. Voltage at the end of the cable
Switches On,m Switches Off, behaves as expected
3. Voltage at end of the cable with valve connected
Switches On, won’t switch off, keeps supplying voltage at 23v until I shutdown the board.
Yeah – good call – will go and test that.
If I see the same voltage results then that would point to either the board or the software.
OK, I checked the voltage.
At first the voltage shows 0.
When I start a station (for 1 minute) the voltage goes to 22.
If I stop all stations the voltage stays at 22.
The voltage stays at 22 until I restart the unit.
Any idea what could be causing that to happen?
Hi Mike,
Thanks for coming back to me on this.
The valves are these ones:
http://www.access-irrigation.co.uk/shop/mist-propagation/propagation-controllers/solenoid-valve-24v-acI have attached an image showing one of the valves wired up. The live (brown) wire goes to the 24v terminal on the valve and back to one of the switch ports on the OSPi
The blue wire goes to the COM port on the OSPi.
I’ll test the voltage later on today and update here (although when you switch off the OSPi, the valve also shuts off – so I imagine I will find that voltage is still being supplied)
Vik
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