New toy for school who train pneumatic.
i cant see any use of it.

Quote from: ronf57 on May 14, 2019, 06:34:46
My question is how many can the raspberry pi3b+ support stacked and can they be individually addressed. I have a pool control system in mind that needs a back of relays to implement. What is the voltage and current load of each relay and I don't want to overwhelm the pi regulator circuit. I was going to build a separate board with a relay bank but at this price if stackable or split distribution ribbon cables this looks tasty as a solution. Been a while since I built something.

Stacked, I don't know. If the relays are setup like most of these relays are, they will be activated by a transistor, that is separated from the Pi via an optoelectric gap. So all the Pi drives is one tiny, enclosed LED per relay. The Pi does not drive the relay itself nor is it even driving the transistor.

Most of the relays for these microcontrollers/SBCs are already available, and don't need to be stacked (though you'll have to build/print a case or chassis to hold it all).

You should have at least 25 GPIO pins for use (from a stock Pi), so about 25+ relays.

My question is how many can the raspberry pi3b+ support stacked and can they be individually addressed. I have a pool control system in mind that needs a back of relays to implement. What is the voltage and current load of each relay and I don't want to overwhelm the pi regulator circuit. I was going to build a separate board with a relay bank but at this price if stackable or split distribution ribbon cables this looks tasty as a solution. Been a while since I built something.

I don't get it. Raspberry Pi Relay hats have long existed. What makes this one special over the incumbents?

One of them, on Amazon US, is $1 cheaper, and uses higher rated Panasonic relays (same DC, 10A 250VAC).