Prompt Box

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The Raspberry Pi gets the latest Beijing AQI reading from the web every 30 minutes, then displays it on a LCD.

1. You will need to connect a I2C LCD to the Raspberry Pi

   1. The LCD uses 5V, not 3.3V

2. You will need to enable the I2C interface on the RPi

   1. In terminal, “sudo raspi-config” then enable the I2C interface

   2. In terminal, “sudo i2cdetect -y 0” to get the LCD’s address.  Our code uses address 0x3F

3. There are three files

   1. i2c_lib.py – this teaches the RPi how to talk to the LCD Display

   2. lcddriver.py – these contain the actual commands that the LCD understands

   3. AQI.py – this is the code you run for displaying the AQI

4. There is a potentiometer behind the LCD.  You may have to adjust it to get a good contrast to see the display.