GSAS Display & Input Modules

The GSAS Display and Input Modules are a set of five interface modules covering the essential human-machine interface (HMI) peripherals used in embedded systems education. From basic 7-segment multiplexing to LCD character display control, keypad scanning algorithms, and audio output generation, these modules provide hands-on experience with the display and input technologies that every embedded engineer encounters in product development. Each module connects to GSAS microprocessor trainer kits through the standard bus connector.

Students progress through increasingly sophisticated I/O techniques: the 7-segment display module teaches multiplexed digit driving and BCD-to-segment conversion, the LCD module introduces character display command protocols and custom character generation, the keypad matrix module covers row-column scanning and debounce algorithms, the keyboard display controller module demonstrates hardware-assisted I/O management using the 74LS164 IC, and the music tone generator module applies timer programming concepts to produce audible output with programmable frequency and duration.

These modules align with the display and input interfacing experiments specified in standard microprocessor and embedded systems curricula. Each module includes on-board components, clearly labelled connections, and compatibility with the GSAS structured lab manual.

Module Overview

Module	Key Components	Function	Typical Experiments
7-Segment Display	Common anode/cathode 7-segment digits	Multiplexed numeric display	Digit multiplexing, BCD conversion, scrolling display
LCD 16x2	HD44780-compatible LCD	Character display output	Command/data protocol, cursor control, custom characters
Keypad 4x4	4x4 matrix keypad	Input scanning	Row-column scan, key debounce, key encoding
Keyboard Display Controller	74LS164 IC	Hardware keyboard/display management	Scanned keyboard mode, FIFO buffer, display scan modes
Music Tone Generator	Speaker + driver circuit	Audio frequency output	Programmable tone generation, melody sequencing, timer-driven audio

Specifications

Parameter	Value
7-Segment	4–8 digit multiplexed display
LCD	16x2 character, HD44780 compatible
Keypad	4x4 matrix (16 keys)
74LS164 Controller	Encoded/decoded scan modes, 8-byte FIFO
Audio Output	8-ohm speaker with driver amplifier
Bus Interface	Standard GSAS trainer bus connector
Power	Supplied from trainer kit

Why GSAS

GSAS manufactures these display and input modules in Bangalore, providing consistent build quality and immediate availability for lab deployments. The five-module set covers all standard HMI interfacing experiments for microprocessor courses, and the modular design means colleges can scale their lab setup incrementally. The GSAS education products team supports faculty with lab manual content, experiment guidance, and volume pricing for institutional procurement.

Products are available for immediate purchase through the GSAS online store (“Buy on Store”) or through direct engagement for institutional and volume orders (“Request Volume Pricing”).