Emon PI LCD - Dont Show Data

delphsoft · 2016-06-03T22:26:11.140Z

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

WP_20160603_19_05_43_Pro 1.jpg3264×1840 1.33 MB

WP_20160603_19_05_56_Pro 1.jpg3264×1840 1.67 MB

WP_20160603_19_05_31_Pro 1.jpg3264×1840 1.71 MB

glyn.hudson · 2016-06-03T23:24:32.928Z

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

delphsoft · 2016-06-03T23:54:09.766Z

glyn.hudson:

Silly, question but have you tried adjusting the contrast potentiometer?

i ll try it thanks !!!