emonPiLCD

The service handles display output and button press input on the emonPi v1 and emonPi v2. Code moved from the emonpi repository.

There are two sub-scripts emonPiLCD1.py that works with the original emonPi v1 (HD44780 LCD with PCF8574 I2c, I2C address 0x27 or 0x3f) and emonPiLCD2.py that works with the newer emonPi2 ssd1306 based OLED display.

Script emonPiLCD.py detects which emonPi version is connected by checking the I2C address returned.

Install

• Use sudo raspi-config to enable I2C (enabled on emonSD as standard).

• Make sure that one wire temperature sensing is not enabled on GPIO 4 with the emonPi2 as this is used for the push button.

• Run the installation script:

  ./install.sh

Manual detection of LCD on I2C bus and find out address

$ sudo i2cdetect -y 1

Expected output is 0x27 or 0x3F e.g.

pi@emonpi:~ $  sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --