Our goal
- Let’s make an air quality monitoring.
Required materials
- 1 x IOT:kit
Background
What is the IOT
- IoTThe Internet of things (IoT) is the network of devices such as vehicles, and home appliances that contain electronics, software, sensors, actuators, and connectivity which allows these things to connect, interact and exchange data.The IoT involves extending Internet connectivity beyond standard devices, such as desktops, laptops, smartphones and tablets, to any range of traditionally dumb or non-internet-enabled physical devices and everyday objects. Embedded with technology, these devices can communicate and interact over the Internet, and they can be remotely monitored and controlled.
Hardware connection
As below picture, connect LED IN of the dust sensor to P9 and OUT to P10.
Connect the OLED screen to the IIC interface.
Software
Coding
Step 1
- Click on “Advanced” in the MakeCode Drawer to see more code sections.
- We need to add an extension for coding to the IOT. Click on the “Extension” at bottom of coding drawer, then Search for “IOT” and click on the IOT package to add it to your project. (As below picture)
Note：If you get a warning telling you some packages will be removed because of incompatibility issues, either follow the prompts or create a new project in the Project file menu.
Step 2
Snap the initialize OLED block into the on start and write parameters 64*128.
Initialize the OLED screen to 64* 128 pixel.
Step 2
Snap the clear OLED display, show string and show number blocks into the forever as below picture.
Showing string Dust(ug/m3):to display returned value of the dust sensor.
Pause 60s, once a minute.
Program
Program link：https://makecode.microbit.org/_7EPDui88d7v3
If you don’t want to type these code by yourself, you can directly download the whole program from the link below:
Result
The dust particle number will be displayed every minute.
Think
How do you do to make it alarm when the air is in bad quality?