Problems with i2c (and an LCD display)
By Nicola
2008-07-29 20:12
2008-07-29 20:12
So, i just wasted an evening trying to make an LCD with i2c work with my picaxe.
I connected the SCL and SDA of the board to the other end on the LCD. (of course not crossing them :P) BTW on the picaxe the pins are: Digital input 3 = SCL; Digital input 4 = SDA, am i right ?
If so, other question is: do i need the two pullup resistors ? i've read somewhere that they're already there on the board. But if so, the pin should be high most of the time, shouldn't it ? testing with my voltmeter reads 0V.
PS i have the picaxe 28x1.
I haven't done anything with
Yes, i've read it.. But i'm
Yes, i've read it.. But i'm using a board AXE033 which connect to the LCD, and should have the resistor. This one:
http://www.rev-ed.co.uk/docs/axe033.pdf
When i start it, the first line gets completely black and the second line stays clear.. no text :(
Simple checks
There are always little things that I've missed with a new device. Have you checked jumper J1 for I2C use? How about the contrast adjustment, turning it a bit with the device powered? Think it said something about displaaying a time message when the 2 CLK contacts are shorted.
Sort of sounds like a contrast adjustment is needed.