I finally got the LCD screen to run properly from the Python library in the tutorials.

I can't say I had to change anything. I did have to adjust the voltage (err contrast? brightness?) on with the potentiometer on the back of the LCD. It was set either too high or too low. I thought I had adjusted it before, but apparently everything wasn't lined up. This last time around, I had SCL plugged into 19 and SDA into 20. I will go sit in a corner later.

Changes to the Tutorial that I had to discover.

1. opkg install ca-bundle (to install the certificate bundle to let git work right)
2. The script I used above to help me find the right address, but the address was the same as in the documentation from the gentleman who made the library.
3. The script fails if you don't add the address.

python lcd.py --line1="HELLO WORLD" --line2="LET FREEDOM RING!" --address=0x3f

is what worked for me.

1. Adjusting the brightness with the blue Trim Pot (Trimming potentiometer) after something has been written to the screen.

Hope this helps someone. I ran around in circles for quite awhile.

I used this little script to scan all of the addresses.

#!/bin/sh
for i in $(seq 3 122 )
do
echo "PORT -- $1 -- " printf '0x%x' $i
i2cdump -y $1 printf '0x%x' $i
done

save as scanDump.sh
chmod 777 scanDump.sh

i2cdetect -l

got me a list of the available busses. My bus shows up as

10000900.i2c

so I ran

scanDump.sh 10000900.i2c

The only address that had anything different was 0x3f

Apparently 0x3f is the correct address, but I still am not getting anything to show up on the LCD using the tutorial.

In the the tutorial, the following line is in the code.

from motors import OmegaPwm

When I run the program, I get the error

"Can't find motors to import"

I assume this means that I haven't installed the right opkg yet, but I can't figure out which opkg it is.

I finally got the LCD screen to run properly from the Python library in the tutorials.

I can't say I had to change anything. I did have to adjust the voltage (err contrast? brightness?) on with the potentiometer on the back of the LCD. It was set either too high or too low. I thought I had adjusted it before, but apparently everything wasn't lined up. This last time around, I had SCL plugged into 19 and SDA into 20. I will go sit in a corner later.

Changes to the Tutorial that I had to discover.

1. opkg install ca-bundle (to install the certificate bundle to let git work right)
2. The script I used above to help me find the right address, but the address was the same as in the documentation from the gentleman who made the library.
3. The script fails if you don't add the address.

python lcd.py --line1="HELLO WORLD" --line2="LET FREEDOM RING!" --address=0x3f

is what worked for me.

1. Adjusting the brightness with the blue Trim Pot (Trimming potentiometer) after something has been written to the screen.

Hope this helps someone. I ran around in circles for quite awhile.

I used this little script to scan all of the addresses.

#!/bin/sh
for i in $(seq 3 122 )
do
echo "PORT -- $1 -- " printf '0x%x' $i
i2cdump -y $1 printf '0x%x' $i
done

save as scanDump.sh
chmod 777 scanDump.sh

i2cdetect -l

got me a list of the available busses. My bus shows up as

10000900.i2c

so I ran

scanDump.sh 10000900.i2c

The only address that had anything different was 0x3f

Apparently 0x3f is the correct address, but I still am not getting anything to show up on the LCD using the tutorial.