There are a hardware and a software but this is not all, there is also a case that holds all together 😀 and makes project look good 🙂
The Client wants a nice looking case and this is easy to understand. So new area for me, how to make nice holes for connectors, LEDs, switches and so, last time (with NodeONE) it wasn’t all good.
But today there is no room for failure! Let’s get to work!
Our little devices require a power. Mostly 5V DC. How to deliver it? The power grid is 230V so it is too much 🙂 and additionally, it is AC.
What can we do?
We can use a phone charger. It is easily affordable and does its job. But it looks bad and often we have power so close that it is a waste to use something with a long cord. We want to have a nice, small and compact device. What can we do?
To control 230V/110V devices we mostly use a relay module. What is a relay? We may describe it as a button but instead of a mechanical switch, we have an electric switch. Bluntly speaking it has 230V switchable by 5V. This describe any relay but what about a module?
The module gives us better protection, a control circuit and a device circuit has galvanic separation, often a led to show status and nice mount points. And such module can have more that one channel, it is a group of relays nicely mounted on a single board.