Arduino and shift register

Project Description

This Arduino project with code is a smart parking status display system designed to monitor and show the availability of parking spots in real-time. It leverages a 74HC165 shift register to read the statuses of multiple parking spots using minimal Arduino pins and displays the results on a 16x2 LCD screen.

Key Features

1. Real-Time Parking Spot Monitoring:

   • The system can monitor up to 8 parking spots using switches, sensors, or buttons connected to the 74HC165 shift register.
   • Each spot’s availability is represented as either:
     • X: Occupied.
     • Y: Available.

2. Efficient Pin Usage:

   • The 74HC165 shift register reads the states of 8 parking spots using only 3 Arduino pins for control and communication:
     • SH/LD: Shift/Load Control.
     • CLK: Clock Signal.
     • SO: Serial Output.

3. Visual Feedback:

   • A 16x2 LCD displays the parking statuses:
     • Row 1: Labels the parking spots (1|2|3|4|5|6|7|8).
     • Row 2: Shows real-time statuses (X|Y|X|Y...).

4. User-Friendly Design:

• Compact, scalable, and easy to implement in real-world parking lots.
• Minimal hardware requirements for efficient cost and power usage.

Schematic:

Connections:

How It Works

1. Parking Spot Detection:

   • Each parking spot is connected to a parallel input pin (D0-D7) on the 74HC165 shift register.
   • The sensors or switches indicate whether a spot is occupied (HIGH) or free (LOW).

2. Data Processing:

   • The 74HC165 converts the parallel data from the parking spots into serialized data.
   • The serialized data is sent to the Arduino via the SO pin.

3. Data Display:

   • The Arduino decodes the data and updates the 16x2 LCD.
   • The first row shows the spot labels, and the second row shows the availability status of each spot.

4. System Refresh:

   • The system refreshes every 500 milliseconds, ensuring up-to-date information.

Applications

1. Parking Management:
   • Ideal for monitoring parking lots in malls, offices, or residential complexes.
2. Smart Cities:
   • Can be integrated into IoT systems for real-time parking availability tracking.
3. Scalable Design:
• Additional 74HC165 registers can be daisy-chained to monitor more parking spots.

Advantages

1. Efficient Pin Usage:
   • Only 3 Arduino pins are required to manage 8 parking spots.
2. Real-Time Updates:
   • Instant feedback on parking statuses displayed on the LCD.
3. Scalability:
   • Can expand to handle more spots by adding additional shift registers.
4. Cost-Effective:
• Uses readily available and affordable components.