Arduino® Edge Control
11 / 25
Arduino® Edge Control
Modified: 17/12/2021
3.3 LCD Screen
The Arduino® Edge Control provides a dedicated connector (J1) for interfacing with a HD44780 16x2 LCD display
module, sold separately. The main processor controls the LCD via a TCA6424 port expander over I2C. Data is
transferred over a 4-bit interface. LCD backlight intensity is also adjustable by the main processor.
LCD Schematic
3.4 5V Analog Sensors
Up to eight 0-5V analog inputs can be connected to J4 for interfacing analog sensors such as tensiometers and
dendrometers. Inputs are protected by a 19V Zener diode. Each input is connected to an analog multiplexer that
channels the signal to a single ADC port.
Each input is connected to an analog multiplexer (MC14067) that channels the signal to a single ADC port. The main
processor controls the input selection via a TCA6424 port expander over I2C.
Analog Sensors schematic