- This topic has 2 replies, 1 voice, and was last updated 2 months, 4 weeks ago by Bert Meijer.
2022-02-19 at 20:10 #18315Bert+MeijerGuest
I did my first testrun and it works with one valve. Dropcontroller V3 diy
When I put another in my device, there is only one that works.
I get 18V from a old laptop power supply.
After that it becomes 13V by a Buck convertor.
Is the Buck convertor strong enough to power 3 12V valves?
That is the only thing I can think of.
2022-02-20 at 08:53 #18332MartynKeymaster
Power to the valves come directly from the power input not via the buck converter. Assuming all the valve ports work, and also assuming 12v or 24v valves, 18V is not an ideally voltage to use and means the valves will draw more current than they should. This would lead me to suspect the power supply.
Output from the buck converter goes to the Arduino only. Power goes to the VIN pin which connects to the Arduinos onboard regulator and 13v is a little too much (I think it is spec’d at max 12v). Bring it down to around 8 or 9v.
Have a look at the circuit diagram; bottom right hand corner. This shows the power in circuit.
2022-02-20 at 13:06 #18343Bert MeijerGuest
I did some changes to get 12V on the valves, and made 13V out of the buck convertor. These 13V goes to the Arduino, but I also used it for the valves.
I thought the buck convertor can produce 5A, it would be enough for the valves.
The best option is another power supply of 12V I think.
Thank you for your answer