I'm busy with a project that uses a Raspberry Pi zero and a relay. I've tried 2 relays and neither worked. I'd like some help to understand how to choose the correct relay, as well as which one will work.
First, I used this one: SSR-100DA. I connected the input to the Pi, and the output to my gate motor. The relay is supposed to allow a 2V current run through it, so the circuit to the gate motor is complete and the gate will trigger. This did not work. I tested the resistance, and it was extremely high, so the 2V current could not pass through. I went to the store and bought another relay: HRS4H-S-DC3V. The guy at the store said it will trigger at 3V, and since the Raspberry Pi outputs 3.3V it should be fine right? I swapped the old relay for the new one and it still didn't work. I used a multimeter to see how much power is passed to the relay, and it turned out to be only 1V, so I'm assuming the relay just lets 2V go to waste. I don't know enough about how these things work to know why this is. I looked up the datasheet, but that's all greek to me.
What I'd like to know is: How much current does the Raspberry Pi output?(I blew my multimeter trying to measure it), why does the relay just throw away 2V, how do I determine what relay will work by reading the datasheet, and a recommended datasheet.
It's a lot, but I need help desperately!
Thanks.
First, I used this one: SSR-100DA. I connected the input to the Pi, and the output to my gate motor. The relay is supposed to allow a 2V current run through it, so the circuit to the gate motor is complete and the gate will trigger. This did not work. I tested the resistance, and it was extremely high, so the 2V current could not pass through. I went to the store and bought another relay: HRS4H-S-DC3V. The guy at the store said it will trigger at 3V, and since the Raspberry Pi outputs 3.3V it should be fine right? I swapped the old relay for the new one and it still didn't work. I used a multimeter to see how much power is passed to the relay, and it turned out to be only 1V, so I'm assuming the relay just lets 2V go to waste. I don't know enough about how these things work to know why this is. I looked up the datasheet, but that's all greek to me.
What I'd like to know is: How much current does the Raspberry Pi output?(I blew my multimeter trying to measure it), why does the relay just throw away 2V, how do I determine what relay will work by reading the datasheet, and a recommended datasheet.
It's a lot, but I need help desperately!
Thanks.