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So I am using 8 AA 1.5V batteries that is wired to my 12V 16 channel relay which is wired to my Rpi. I want to be able to control 16 solenoids and use the relay as a switch for the solenoids. As far as my understanding goes the relay channels are "open" when the LED for that channel lights up, which would "trigger" the solenoid, but that's not happening. The solenoid works fine when I connect it straight to the 8AA battery pack and "triggers".

Even when I'm using a voltage regulator( https://fyndiq.se/product/7442400-dc-dc-step-down-omvandlare-med-lm2596/) as an intermediator between the battery pack and the solenoid, the output V is showing 5V and the solenoid is triggering. What should I try next?

16 channel 12V Relay: https://www.amazon.com/dp/B0057OC66U?ref_=pe_2640190_290165290_E_304_dt_1

12V Solenoid: https://www.amazon.com/dp/B00LBQ229Y?ref_=pe_2640190_290165290_E_304_dt_1

enter image description here

Leonardbd
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1 Answers1

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From the picture of the wiring I dare say that there is no connection to the 12 V power supply. So the circuit is now just a switch and the solenoid. Without a voltage source the solenoid is not going to do much.

From the product description you can tell that the operating contacts of all releays are not connected to anything - which is by the way the most sensible approach as it allows to use all relays independently:

enter image description here

You need to connect the 12 V power supply, the relay's contact and the solenoid in series to get it working, see e.g. Seamus' answer here, which is also the source of this schematics (note that the ground (GND, the "triangles") close the circuit between the power supply and the solenoid):

schematic

Ghanima
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