Interfacing Arduino 74164 Serial Shift Register Driving LCD Display

     Tweet

Here we will explore how to connect Arduino to a 2 line by 16 character LCD display. The electrical connections are shown above. I have avoided user supplied libraries because changes in the Arduino compiler means some of them don't work. The other point being how to write one's own code and get a better understanding of the electronics and how a micro-controller really operate. This will enable the student or hobbyist to connect other similar devices or learn how to connect new devices.

The code will allow one to display characters, strings, integers, and floats on the LCD display. Some of the code was borrowed from the following projects minus the GPIO expander and the use of a 74164 code for Arduino.

Download the complete code for this demo: arduino4a.txt.

YouTube video for this project: Using a SN74164 Serial Shift Register with a LCD Display and Arduino

About the 74164 Shift register and the LCD Display

Demo to shift byte into 74HC164 to operate LCD display. In the case of the Hd44780 type display Q1-Q7 of the 74164 connects to D0-D7 LCD.

The 74HC164 has three inputs:

• Input A-B (pins 1, 2) is for data. they can be tied together or the one not used tied to +Vcc
• Clock pin 8 data is serially shifted in and out of the 8-bit register during the positive going transition of clock pulse.
• Clear (pin 9) is independent of the clock and accomplished by a low level at the clear input. Can connect to Vcc.

As far as LSB first or MSB bit first is up to software and electrical connections on the output. LCD pin 6 (E), HIGH to LOW transition will clock info into display. Select command or data with RS. RS set to 0 is command, 1 is data. R/W goes to ground. LCD command codes are shown below.

Program code for this project: arduino_74164.txt

• In Depth Look at AC Power Control with Arduino
• YouTube Video for Arduino AC Power Control
• Four part series:
• Experimenting with the PCA9555 32-Bit GPIO Expander with Arduino
• PCA9555 32-Bit GPIO Expander with Arduino and a 4X4 Keypad
• PCA9555 32-Bit GPIO Expander with Arduino Using Interrupts
• PCA9555 32-Bit GPIO Expander with Arduino and LCD Display
• Rotary Encoder Used with Arduino Interrupts
• Connecting Arduino to a 74C164 Shift Register
• Using the MC3479 Stepper Motor Controller with Arduino
• My YouTube Channel

• See related:
• Connecting Arduino to a 74C164 Shift Register
• Connect Arduino to LCD Display with 74164 Shift Register
• Arduino with LCD Display and DS18B20 Temperature Sensor
• Below has differing code from the above. Works the same.
• Arduino with LCD Display and DHT11 Temperature-Humidity Sensor

• Arduino Stepper Motor Coil Winder
• Arduino Projects Revisited Revised
• Schematic for Following Projects PDF
• Programming ADS1115 4-Channel I2C ADC with Arduino
• Arduino uses ADS1115 with TMP37 to Measure Temperature
• Connect Arduino to I2C Liquid Crystal Display
• Arduino Reads Temperature Sensor Displays Temperature on LCD Display
• Arduino with MCP4725 12-bit Digital-to-Analog Converter Demo
• Videos
• Arduino with ADS1115 4-Channel 16-bit Analog-to-Digital Converter
• Arduino with MCP4725 12-Bit DAC

• Connect-Program Arduino and a MM5451 LED Display Driver
• Arduino and a MM5451 LED Display Driver YouTube
• Programming Arduino and the 74HC595 Serial Shift Register
• Programming Arduino and the 74HC595 Serial Shift Register YouTube

• Arduino Analog to Digital Conversion Voltmeter
• Arduino ADC Voltmeter YouTube video
• Arduino Pulse-Width Modulation Digital to Analog Conversion
• Arduino PWM to ADC YouTube video
• Zero-Crossing Detectors Circuits and Applications
• Zero-Crossing Detectors YouTube video