Data Sheet

76 : circuit 4a
TROUBLESHOOTING
The screen is blank or
flickering
Adjust the contrast by twisting the potentiometer. Try both
directions until you see characters display. Do not twist
the potentiometer past its stopping points. Also, check the
potentiometer, and make sure it's wired correctly.
Not working at all
Double check the circuit’s wiring. There are a lot of wires in
this circuit, and it’s easy to mix up one or two.
Rectangles in first row
If you see 16 rectangles (like “
”) on the first row, it may be
due to the jumper wires being loose on the breadboard. This is
normal and can happen with other LCDs wired in parallel with
a microcontroller. Make sure that the wires are fully inserted
into the breadboard, then try pressing the reset button and
adjusting the contrast using the potentiometer.
Still not working?
Jumper wires unfortunately can go “bad” from getting bent
too much. The copper wire inside can break, leaving an open
connection in your circuit. If you’re certain that your circuit is
wired correctly and that your code is error-free and uploaded
but you are still encountering issues, try replacing one or more
of the jumper wires for the component that is not working.
A
LCD “HELLO, WORLD”
TEMPERATURE SENSOR
“DIY WHO AM I” GAME
You’ve completed
Circuit 4A!
Continue to circuit 4B to learn about using temperature sensors.
B C