I just bought from ebay 111ager SSR 3-32VDC input power supply with load current upto 5A @ 5-220VDC. Link to the product: (https://goo.gl/MOkAU3).
I wanted to use it to control a 5VDC@2.1A load using Arduino UNO. I didn't connect any external component as I thought the SSR should do the task it is designed for without having to include external electrical components.
The code in the arduino puts high the SSR pin for 10 seconds and then turns it low for 5 seconds. I connected my smartphone (samsung galaxy S6) on the load side. And here is what happens: My phone just blinks without charging after each 5 second the SSR is LOW. The picture below shows the connection diagram.
My guess was that the phone is not getting enough current from the USB power supply as the SSR probably has higher resistance. But I don't know what I should do. Any kind of comment/suggestion is quite welcome.
[PS: I connected the SSR input at 5V DC of the Arduino. The same things happens with the 3.3v of the arduino]