Hi
I have the LCD Display model as you suggest (HD44780 LCD with PCF8574 I2) , but don’t show any data on it ,
I tried with the first SD Card , the original that comes with PCB enclosure Jun 2015 1.6v
I tried with a new clean SD Card , with the upgrade
I both cases the displays turn on , but not show any data on it
Silly, question but have you tried adjusting the contrast potentiometer?
Assuming you have double checked the I2C cable connections…
Can you SSH into the Pi and run:
sudo i2cdetect -y 1
This should return:
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: -- -- -- -- -- -- -- --
This is indicating the LCD has been detected on I2c address 0x27
i ll try it thanks !!!