Some time ago an opportunity knocked on my door. A friend needs a device that would read a card, send the id to the server and react to response.
Today we will work on code and create a class and a handler for the RC522 module.
Module and handler added to NodeMCU boilerplate @ GitHub
I’m on a project that requires some feedback after the operation is made. I cannot use an LCD because they are only two pins left and almost no memory. So my mind focused on two LEDs but after a while, I made a choice, I will use tricolour LED.
From what I read there are two types, one with a common anode and one with common cathode. We will go with common anode.
We have a touch driver in our GfxLCD package so we can upgrade Doton a little. We will add clickable widgets.
Our window managers will handle touch propagation. For the first widget with action, we will create a light switcher.
In parameters.lua we may set only one access point and a password. But lately, I’m testing my devices in different areas, different APs. Changing passwords all the time is stupid so we need to improve this.
We will allow the table of credentials and boilerplate will iterate over them to get the connection.
Today we combine the power of HLK-PM01, PIR HC SR-501, DHT11 and a light detector.
Together they create a nice looking multipurpose Node One. I wanted to do it for some time but the last piece was missing. I didn’t have an idea how to create a box for components.
Few days ago I found a perfect case named Z27. It has all I wanted, socket, plug and enough space for NodeMCU v3.
Python code @ GitHub
LUA code @ GitHub (more…)
We have a nice node that detects light, it works in toilet @ my work 🙂 It does it jobs almost perfectly. There is still a hack for it – leave a light on when leaving the toilet. I have an idea to fix this but first, let’s reforge a lousy code into a module and a handler. After refactor we may safely add it to the NodeMCU boilerplate.
This is going to be our second data node for display. It will show area lightness and with conjunction with a time, we can tell if an artificial light is on or off.
We have LCDs and we should have a data that can be displayed on them, we need data sources. So in parallel with displaying, let’s work on some sensor nodes.
First will be a motion detector, we gonna use a module with easy to remember name: PIR HC-SR501 🙂.
There are a few variants of it. But the main difference is an ability to use jumpers to change mode. My version can’t do that 😦
As a brain for sensor we will use the NodeMCUv3 board and as a language the LUA.