ESP32-Based Review System

Introduction

The ESP32-based review system is a hardware and software solution designed to gather customer feedback efficiently, transmit it to a server, and analyze the data to improve customer satisfaction.

System Components

Hardware

• ESP32 Microcontroller:
  • Acts as the central unit for the system, handling input and Wi-Fi communication.
  • Offers built-in support for touch-sensitive inputs and connectivity.
• Touch Switches (4):
  • Represent the feedback options (e.g., Excellent, Good, Average, Poor).
  • Capacitive touch sensors provide a modern and seamless input method.
• Power Supply:
  • A 5V or battery-based supply for portability.
• Enclosure:
  • Protects the hardware and offers an ergonomic design for user interaction.

Server

• A centralized server to store, manage, and analyze feedback data.
• The server can be hosted locally or in the cloud, depending on scalability needs.

Display (Optional):

• An OLED or LCD screen to show a confirmation message after the customer provides feedback.

PCB Manufacturer

PCBWAY is a highly skilled company specializing in PCB manufacturing. They offer their services at incredibly low prices, such as providing 10 PCBs for only $5. Additionally, new members receive a $5 bonus. The website allows customers to upload their Gerber Files and place orders.

ORDER LINK

PCBWAY is known for producing PCBs of exceptional quality and maintaining high standards, which is why many people trust them for their PCB and PCBA needs.

Below are some of my PCB’S manufactured by PCBWAY and I am fully satisfied by their Quality of service they provide.

Working Mechanism

Input:

• The 4 touch switches allow customers to provide feedback by simply touching the respective button.
  • Example:
    • Touch 1: Excellent
    • Touch 2: Good
    • Touch 3: Average
    • Touch 4: Poor

Processing:

• The ESP32 detects the touch input using its capacitive sensing GPIO pins.
• Each input corresponds to a predefined rating, which is mapped internally in the program.

Transmission:

• The ESP32 sends the feedback data (e.g., rating, timestamp, location) to the server via Wi-Fi.
• Data is transmitted using standard communication protocols like HTTP or MQTT.

Data Storage:

• The server stores the feedback in a database (e.g., MySQL, Firebase, or NoSQL databases like MongoDB).

Analysis:

• Data visualization tools or dashboards (e.g., Power BI, Grafana, or a custom web application) are used to:
  • Identify trends (e.g., most common feedback).
  • Pinpoint issues (e.g., consistently poor ratings from a specific location).
  • Generate reports for management

Key Features

Real-Time Feedback Collection:

• Feedback is instantly transmitted to the server.

Touch-Based Input:

• Modern and user-friendly, with no need for physical buttons.

Wireless Connectivity:

• Leverages the ESP32’s Wi-Fi capabilities for seamless communication.

Data Security:

• Feedback data can be encrypted during transmission for security.

Scalability:

• Multiple ESP32 devices can connect to the same server from different locations

Enclosure Design

Design 1

Design 2

PCB in Hand

Example Use Cases

Retail Stores:

• Customers provide feedback on their shopping experience.

Restaurants:

• Guests rate their dining experience at the exit.

Service Centers:

• Clients evaluate the service quality after their visit.

Public Events:

• Attendees rate their satisfaction with the event organization
• Attendees rate their satisfaction with the event organization

PCB Files

Schematic File

PCB Files

Touch Button PCB

We have used TTP223 Capacitive Touch Sensor as a capacitive touch sensor.

When the TTP223 module is powered on, the SIG pin will be in a stable low state until a touch is detected. When a touch is detected, the SIG pin will go high, indicating to the Arduino that a touch has occurred.

Make Own TTP223 Capacitive Touch Sensor Module

I have included the Design File (Geber ) in the article itself. You can just download it and order from your PCB manufacturer

For Full project of this the touch sensor visit:

TTP223 Capacitive Touch Sensor

Manufacturing Files

Gerber

Position Files

Bill Of materials

Order Directly from PCB WAY

I have already uploaded all these required manufacturing files in PCBWAY website. You can easily go to the below link and place you order, and get your Own  Home Automation PCB manufactured from one of the best pcb manufacturer PCBWAY

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Challenges and Solutions

Challenge: Wi-Fi Connectivity Issues

• Solution: Use fallback mechanisms like local storage to temporarily store data if Wi-Fi is unavailable.

Challenge: Accidental Touch Inputs

• Solution: Add a debounce mechanism in the code to filter out unintended inputs.

Challenge: Data Privacy

• Solution: Implement encryption for data transmission and access control on the server