I've just received a Keyestudio W5500 Ethernet Development Board, I bought this device because Arduino Ethernet Uno r3 was discontinued, and I don't want loads of shields. So anyway it arrived this morning.
The device needs to be powered by 7 - 12 Volts DC power source via a barrel connector. However, the polarity is unclear.
- The power polarity is not indicated on the board anywhere
- It isn't indicated on the box that the device came in
- It's not indicated on the company webpage for this product here: https://www.keyestudio.com/keyestudio-w5500-ethernet-development-board-for-arduino-diy-project-without-poe-p0368.html
- It's not on the wikipedia page either: https://wiki.keyestudio.com/Ks0304_Keyestudio_W5500_ETHERNET_DEVELOPMENT_BOARD_(WITHOUT_POE)
- The sales team need to consult with engineers to find out... and that could take a while...
So I'm wondering if there is a way to check what the polarity is using a multimeter?
Now I've checked that the outside of the barrel connector goes through to all the ground pins. But I read somewhere that ground can be negative or positive, so actually, I'm not sure that helps me.
I'm an electronics n00b. Are there standard ways to checking these things?