Newhaven Display Forum

I have hooked up this COG (Chip‐On‐Glass) Character Liquid Crystal Display Module to a Raspberry Pi and am using the command sudo i2cdetect -y 1 to probe the I2C bus for the display, but it detects nothing. Should this work? I'm using a Saleae logic probe to watch the bus and the clock pulses are not uniform. I am not using the pull-up resistors as shown in Newhaven's diagram because I understand the Raspberry Pi has the pull-ups built-in.