Display-O-Tron RGB Breakout *No Text*


#1

I recently assembled the DoT RGB Breakout and connected to my Raspberry Pi 3B+. After connecting everything I am able to control the RGB lights with the sample code (https://learn.pimoroni.com/tutorial/sandyj/dot-breakout-usage-pi)

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(5, GPIO.OUT)
GPIO.setup(6, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)
GPIO.output(5, GPIO.HIGH)

However, when I try writing to the display nothing happens
import dot3k.lcd as lcd
lcd.set_contrast(20)
lcd.write(‘AHOY THERE!!’)

Any ideas?


#2
  • Triple check your wiring (the number of times I grapple with software only to find it’s wiring!)
  • Try adding an lcd.clear() right after setting the contrast
  • Try a different contrast, perhaps 30 or 40

Do you have a picture of your setup?


#3

That’s embarrassing. You are right, 2 wires in wrong place.
All fixed.
Thank you!


#4

Believe me, this kind of intuition can only come from years of me making exactly the same mistakes ;)

You’re welcome!