Serial Controlled 1602 LCD Display on Arduino

Use an Arduino to drive a 1602 LCD display, sending text to it from another device (such as a Raspberry Pi or C.H.I.P) over Serial.

Usage:

• By default, Serial interface runs as 115200 baud
• On initialisation, the Arduino will send "WUT_SAY"
• Send text of up to 32 characters
• Optionally, break between line 1 and 2 of the display with ~ (eg. "This is line 1~This is line 2")
• End text with a line break / EOL ("\n")
• The arduino will reply with "K_DONE~(Your text)"

Text automatically wraps across both lines of the display, unless, line 2 is explicitly set as above using ~ as a break.

The circuit:

• LCD RS pin to digital pin 12
• LCD Enable pin to digital pin 11
• LCD D4 pin to digital pin 5
• LCD D5 pin to digital pin 4
• LCD D6 pin to digital pin 3
• LCD D7 pin to digital pin 2
• LCD R/W pin to ground
• LCD VSS pin to ground
• LCD VCC pin to 5V
• 10K resistor:
• ends to +5V and ground
• wiper to LCD VO pin (pin 3)