𝐕𝐨𝐢𝐜𝐞 𝐎𝐟 𝐭𝐡𝐞 𝐏𝐞𝐨𝐩𝐥𝐞 : 𝐒𝐦𝐚𝐫𝐭 𝐏𝐮𝐛𝐥𝐢𝐜 𝐅𝐞𝐞𝐝𝐛𝐚𝐜𝐤 𝐒𝐲𝐬𝐭𝐞

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Published February 26, 2025

𝐒𝐦𝐚𝐫𝐭𝐒𝐞𝐧𝐬𝐞 - Smart Public Feedback System

A smart IoT review system that collects real-time public feedback via sensors, logs data to ThingSpeak, and provides instant insights.

BeginnerFull instructions provided144

𝐒𝐦𝐚𝐫𝐭𝐒𝐞𝐧𝐬𝐞 - Smart Public Feedback System

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

For WiFi communication and processing.

ControlEverything.com 4-CHANNEL RELAY CONTROLLER FOR I2C

For controlling external devices.

Adafruit Humidity and Temperature Sensor

To collect user feedback.

Jumper wires (generic)

For proper connections.

Digilent 60W PCIe 12V 5A Power Supply

Power supply for the circuit.

Linear Regulator (7805)

To step down 12V to 5V.

Seeed Studio Grove - WS2813 RGB LED Strip Waterproof - 60 LED/m - 1m

To indicate feedback visually.

Software apps and online services

Arduino IDE

Code, upload, and debug firmware for NodeMCU.

ThingSpeak API

Collect, store, and visualize public review data online.

Story

𝐕𝐨𝐢𝐜𝐞 𝐎𝐟 𝐭𝐡𝐞 𝐏𝐞𝐨𝐩𝐥𝐞 : 𝐒𝐦𝐚𝐫𝐭 𝐏𝐮𝐛𝐥𝐢𝐜 𝐅𝐞𝐞𝐝𝐛𝐚𝐜𝐤 𝐒𝐲𝐬𝐭𝐞𝐦

𝙸𝚗𝚝𝚛𝚘𝚍𝚞𝚌𝚝𝚒𝚘𝚗 - 𝙰 𝚂𝚖𝚊𝚛𝚝𝚎𝚛 𝚆𝚊𝚢 𝚃𝚘 𝙶𝚊𝚝𝚑𝚎𝚛 𝙿𝚞𝚋𝚕𝚒𝚌 𝙾𝚙𝚒𝚗𝚒𝚘𝚗

In today’s fast-paced world, real-time feedback is essential for improving services. Traditional surveys are slow and ignored, but what if feedback could be instant, effortless, and smart? Introducing SmartSense, an innovative public review system powered by sensors that collect feedback without manual input !

𝙺𝚎𝚢 𝙼𝚎𝚛𝚒𝚝𝚜 - 𝚆𝚑𝚢 𝚂𝚖𝚊𝚛𝚝𝚂𝚎𝚗𝚜𝚎 ?

🔹 𝗧𝗼𝘂𝗰𝗵𝗹𝗲𝘀𝘀 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗰 – Sensors detect user response, eliminating the need for buttons.

🔹 𝗥𝗲𝗮𝗹 𝗧𝗶𝗺𝗲 𝗗𝗮𝘁𝗮 𝗜𝗻𝘀𝗶𝗴𝗵𝘁𝘀 – Instantly sends data to ThingSpeak for live analysis.

🔹 𝗔𝗜-𝗥𝗲𝗮𝗱𝘆 – Can integrate with analytics for predictive insights.

🔹 𝗦𝗰𝗮𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗮𝗻𝗱 𝗩𝗲𝗿𝘀𝗮𝗹𝗶𝘁𝘆 – Works in malls, stations, offices, and public spaces.

🔹 𝗨𝘀𝗲𝗿-𝗙𝗿𝗶𝗲𝗻𝗱𝗹𝘆 – No apps, no QR codes—just real-world interaction.

🔹 𝗙𝗹𝗲𝘅𝗶𝗯𝗹𝗲 – Can be expanded with more sensors and data points.

🔹 𝗟𝗼𝘄 𝗟𝗮𝘁𝗲𝗻𝗰𝘆 𝗖𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻 – Fast data transmission ensures instant feedback updates.

🔹 𝗦𝗲𝗰𝘂𝗿𝗲 𝗗𝗮𝘁𝗮 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴 – Protects user inputs with encrypted cloud storage

.🔹 𝗣𝗿𝗼𝗺𝗼𝘁𝗲𝘀 𝗖𝗼𝗺𝗺𝘂𝗻𝗶𝘁𝘆 𝗘𝗻𝗴𝗮𝗴𝗲𝗺𝗲𝗻𝘁𝘀 – Encourages public participation in service improvements.

🔹 𝗜𝗻𝘀𝘁𝗮𝗻𝘁 𝘃𝗶𝘀𝘂𝗮𝗹 𝗙𝗲𝗲𝗱𝗯𝗮𝗰𝗸– LEDs indicate user responses in real-time.

𝙱𝚎𝚑𝚒𝚗𝚍 𝚃𝚑𝚎 𝙸𝚗𝚗𝚘𝚟𝚊𝚝𝚒𝚘𝚗 - 𝙷𝚘𝚠 𝙸𝚝 𝚆𝚘𝚛𝚔𝚜 ?

1️⃣ Sensing User Input 🛎️

Sensors (instead of buttons) detect user interactions like touch or proximity.

Each sensor represents a feedback option (e.g., happy, neutral, sad).

2️⃣ Processing the Data 🔄

NodeMCU reads the sensor inputs and updates the count for each response.

Corresponding LEDs briefly turn ON to confirm the feedback is recorded.LEDs then turn OFF to be ready for the next input.

3️⃣ Transmitting Data to the Cloud 📡

NodeMCU sends the feedback data to ThingSpeak over Wi-Fi.

Data is logged in fields corresponding to each feedback type.

4️⃣ Real-Time Data Visualization 📊

ThingSpeak processes the data and displays it in charts and graphs.

Admins can monitor trends in real-time for decision-making.

𝚆𝚑𝚎𝚛𝚎 𝙸𝚝 𝙲𝚊𝚗 𝙱𝚎 𝚄𝚜𝚎𝚍 ?

🏢 𝗦𝗺𝗮𝗿𝘁 𝗥𝗲𝘀𝘁𝗿𝗼𝗼𝗺𝘀 – Hygiene feedback at malls, airports, offices.

🛍️ 𝗥𝗲𝘁𝗮𝗶𝗹 𝗮𝗻𝗱 𝗠𝗮𝗹𝗹𝘀 – Quick customer satisfaction surveys.

🚌 𝗣𝘂𝗯𝗹𝗶𝗰 𝗧𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁 – Experience ratings for buses, metros, taxis.

🎭 𝗘𝘃𝗲𝗻𝘁𝘀 𝗮𝗻𝗱 𝗘𝘅𝗵𝗶𝗯𝗶𝘁𝗶𝗼𝗻𝘀 – Instant attendee feedback.

🏥 𝗛𝗼𝘀𝗽𝗶𝘁𝗮𝗹𝘀 𝗮𝗻𝗱 𝗰𝗹𝗶𝗻𝗶𝗰𝘀 – Patient feedback for better healthcare services.

🎓 𝗘𝗱𝘂𝗰𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗜𝗻𝘀𝘁𝗶𝘁𝘂𝘁𝗶𝗼𝗻𝘀 – Student opinions on courses, faculty, and facilities.

🎤 𝗖𝗼𝗻𝗰𝗲𝗿𝘁𝘀 𝗮𝗻𝗱 𝗙𝗲𝘀𝘁𝗶𝘃𝗮𝗹𝘀 – Real-time audience experience ratings.

🏨 𝗛𝗼𝘁𝗲𝗹𝘀 𝗮𝗻𝗱 𝗥𝗲𝘀𝗼𝗿𝘁𝘀 – Guest satisfaction surveys for service improvement.

⚖️ 𝗚𝗼𝘃𝗲𝗿𝗻𝗺𝗲𝗻𝘁 𝗢𝗳𝗳𝗶𝗰𝗲𝘀– Citizen feedback on services and policies.

🍽️ 𝗥𝗲𝘀𝘁𝗿𝗮𝘂𝗻𝘁𝘀 𝗮𝗻𝗱 𝗰𝗮𝗳𝗲𝘀 – Quick dining experience reviews.

🏭 𝗙𝗮𝗰𝘁𝗼𝗿𝗶𝗲𝘀 𝗮𝗻𝗱 𝗪𝗼𝗿𝗸𝗽𝗹𝗮𝗰𝗲𝘀 – Employee feedback on safety and work conditions.

🛑 𝗧𝗿𝗮𝗳𝗳𝗶𝗰 𝗮𝗻𝗱 𝗥𝗼𝗮𝗱 𝘀𝗮𝗳𝗲𝘁𝘆 – Public input on traffic conditions and road maintenance.

𝚃𝚑𝚎 𝙵𝚒𝚗𝚊𝚕 𝚅𝚎𝚛𝚍𝚒𝚌𝚝 - 𝚂𝚖𝚊𝚛𝚝, 𝚂𝚒𝚖𝚙𝚕𝚎 𝚊𝚗𝚍 𝙸𝚖𝚙𝚊𝚌𝚝𝚏𝚞𝚕

In a world driven by opinions, real-time feedback is the key to improvement! This Public Review System transforms raw user responses into actionable insights, making decision-making smarter and more efficient. With cloud connectivity, touch-free sensing, and instant data visualization, this project is a game-changer for businesses, public spaces, and smart cities.

Imagine a future where feedback is effortless, data is powerful, and every opinion counts—that future starts now!

𝐒𝐦𝐚𝐫𝐭 𝐏𝐮𝐛𝐥𝐢𝐜 𝐅𝐞𝐞𝐝𝐛𝐚𝐜𝐤 𝐒𝐲𝐬𝐭𝐞𝐦 - 𝐂𝐢𝐫𝐜𝐮𝐢𝐭 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰

This circuit seamlessly integrates NodeMCU, three touch sensors, three LED strips, and a 4-channel relay module, all powered by a 12V adapter. The 7805 voltage regulator steps down 12V to 5V, ensuring safe operation for the NodeMCU and sensors. Each sensor triggers a corresponding LED strip via the relay, while feedback data is sent to ThingSpeak for real-time monitoring. This setup provides an efficient and scalable solution for public review collection in various environments.

Code

𝐒𝐦𝐚𝐫𝐭 𝐏𝐮𝐛𝐥𝐢𝐜 𝐅𝐞𝐞𝐝𝐛𝐚𝐜𝐤 𝐒𝐲𝐬𝐭𝐞𝐦 - 𝐂𝐨𝐝𝐞 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰

𝐒𝐦𝐚𝐫𝐭 𝐏𝐮𝐛𝐥𝐢𝐜 𝐅𝐞𝐞𝐝𝐛𝐚𝐜𝐤 𝐒𝐲𝐬𝐭𝐞𝐦 - 𝐂𝐨𝐝𝐞 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰

C/C++

The system seamlessly detects sensor inputs and updates ThingSpeak.
LEDs provide instant feedback for user responses.

1. 𝚂𝚢𝚜𝚝𝚎𝚖 𝚜𝚎𝚝𝚞𝚙 𝚊𝚗𝚍 𝚌𝚘𝚗𝚗𝚎𝚌𝚝𝚒𝚟𝚒𝚝𝚢
Connecting NodeMCU to WiFi and initializing components.

2. 𝙳𝚊𝚝𝚊 𝚃𝚛𝚊𝚗𝚜𝚖𝚒𝚜𝚜𝚒𝚘𝚗 – Sending Feedback to ThingSpeak
When a sensor is triggered, the count is updated and logged online.

3. 𝙱𝚘𝚘𝚝𝚒𝚗𝚐 𝚄𝚙 – Initializing the System
Setting up WiFi and configuring input/output pins.

4. 𝚁𝚎𝚊𝚕-𝚃𝚒𝚖𝚎 𝚏𝚎𝚎𝚍𝚋𝚊𝚌𝚔 𝚌𝚘𝚕𝚕𝚎𝚌𝚝𝚒𝚘𝚗
Detecting sensor triggers and logging feedback.

#include <ESP8266WiFi.h>       // Library for ESP8266 WiFi connection
#include <ESP8266HTTPClient.h> // Library for HTTP requests

// WiFi credentials
const char* ssid = "name"; 
const char* password = "password";

// ThingSpeak API details
const char* apiKey = "api_key";
const char* thingspeakServer = "http://api.thingspeak.com/update";

// Initialize WiFi client
WiFiClient wifiClient;

// Sensor and LED pin assignments
int sensor1 = D5, led1 = D2;
int sensor2 = D6, led2 = D3;
int sensor3 = D7, led3 = D4;

// Counters for feedback collection
int count1 = 0, count2 = 0, count3 = 0;

//Sends collected data to ThingSpeak
void sendToThingSpeak(int count, int field) 
{
  if (WiFi.status() == WL_CONNECTED) // Check if WiFi is connected
  {
    HTTPClient http;
    
    // Construct ThingSpeak API URL
    String url = String(thingspeakServer) + "?api_key=" + apiKey + "&field" + String(field) + "=" + String(count);
    
    http.begin(wifiClient, url); // Start HTTP request
    http.GET();                  // Send GET request
    http.end();                   // Close connection
    
    delay(2000); // Delay to prevent frequent requests
  }
}

void setup() 
{
  Serial.begin(9600); // Initialize serial communication for debugging
  
  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) 
  {
    delay(500);
    Serial.print("."); // Print progress dots while connecting
  }
  Serial.println("\nWiFi connected");

  // Set sensor pins as input
  pinMode(sensor1, INPUT);
  pinMode(sensor2, INPUT);
  pinMode(sensor3, INPUT);
  
  // Set LED pins as output
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() 
{
  // Check if sensor1 is triggered
  if (digitalRead(sensor1) == LOW) 
  {
    count1++;                 // Increment counter for sensor1
    digitalWrite(led1, HIGH); // Turn on LED1
    sendToThingSpeak(count1, 1); // Send data to ThingSpeak
    delay(200);               // Short delay
    digitalWrite(led1, LOW);  // Turn off LED1
  }

  // Check if sensor2 is triggered
  if (digitalRead(sensor2) == LOW) 
  {
    count2++;                 // Increment counter for sensor2
    digitalWrite(led2, HIGH); // Turn on LED2
    sendToThingSpeak(count2, 2); // Send data to ThingSpeak
    delay(200);               // Short delay
    digitalWrite(led2, LOW);  // Turn off LED2
  }

  // Check if sensor3 is triggered
  if (digitalRead(sensor3) == LOW) 
  {
    count3++;                 // Increment counter for sensor3
    digitalWrite(led3, HIGH); // Turn on LED3
    sendToThingSpeak(count3, 3); // Send data to ThingSpeak
    delay(200);               // Short delay
    digitalWrite(led3, LOW);  // Turn off LED3
  }
}