Instructions

84Hardware
© 2013 Conrad Electronic
Connection Diagram cutout of I2C-LCD
LC-Display contrast control
The best visibility of the LCD character arises in frontal view. If necessary, the contrast needs to be
adjusted. The contrast can be set with the trimmer R19 ("Contrast" to the left of the LCD screen).
UNIT-BUS Pin Configuration
I2C and UNIT-Bus
The pins on the socket connector Y23 (Block 4) are permanently connected to the pins P34 (SDA)
and P35 (SCL). At the pins on the socket connector Y8 (4 pin) a free UART interface can be as-
signed to the UNIT-bus. The UNIT-bus levels the 3.3V of the UNIT to 5V and 5V signals to 3.3V (bi-
directional level shifter). C-Control I peripheral like I2C modules and other 5V circuitry can be con-
nected to this bus.