Small talks

Daj się poznać / Get noticed – summary

Time is almost over but we have so much more work to do! Of course, we won’t stop our work but let’s summarise was has been done during competition.

The main goal was to build a control node that can gather and display information from different sources/sensors. This node is the Doton project.

But before we could create it we have to do two other projects: a GfxLCD python library, NodeOne sensor and improve one: NodeMCU boilerplate. So, in fact, we have done four projects 🙂


Powering NodeMCUv3 with 5V from power grid via HLK-PM01

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?


Solid state relay vs electromagnetic relay

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.