100 Days 100 IoT Projects

Welcome to my 100 Days 100 IoT Projects repository!
This repo showcases my journey of learning and implementing IoT & Embedded Systems projects using ESP32, Raspberry Pi Pico, and MicroPython.

Each project is designed to teach a specific concept, sensor, or IoT technique — from basic analog/digital readings to web-based dashboards.

Recognition & Features

Technologies, Boards & Tools Used

Hardware

• ESP32, ESP8266 (NodeMCU)
• Raspberry Pi Pico / Pico W / Pico 2 W
• XIAO ESP32-S3
• Arduino (UNO / Nano)

Programming & Platforms

• MicroPython
• Python (Tkinter, CustomTkinter, Matplotlib)
• Arduino + Python (Serial, PyFirmata)

Sensors & Modules

• LDR, Potentiometer, DHT11
• PIR, IR, Ultrasonic (HC-SR04)
• Gas Sensors (MQ-4, MQ-7, MQ-135)
• RTC (DS3231), TM1637, OLED, LCD
• Relay, Servo, Touch Sensor

Concepts Covered

• ADC, PWM, GPIO
• Wi-Fi, Web Server, WebSocket
• Bluetooth, Blynk IoT
• Data logging & visualization
• Simulation-based testing

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Project List

Day	Project	Board / Sensor	Description
1	Auto Night Light	ESP32 + LDR	Automatic LED turns ON/OFF based on ambient light
2	Dimmer LED using Potentiometer	ESP32 + Potentiometer	LED brightness controlled via potentiometer using ADC + PWM
3	DHT11 Temperature & Humidity Web Server	ESP32 + DHT11	Reads temperature & humidity and displays on a live web page
4	1-Digit Seven Segment Display	Raspberry Pi Pico + 7-Segment	Displays numeric output using GPIO control
5	Mini Weather Station (DHT11 + LCD)	ESP8266 + DHT11 + I²C LCD	Displays real-time temperature & humidity on 16x2 LCD without flickering
6	RGB Color Mixer using Potentiometers	ESP32 + 3 Potentiometers + RGB LED	Mix RGB colors by adjusting potentiometers using ADC and PWM
7	Potentiometer Bar Graph Display	ESP32 + Potentiometer + 10 LEDs	Visualize analog input as a 10-LED bar graph using ADC mapping
8	MQ4 Gas Leak Detection System	ESP32 + MQ4 Sensor + Buzzer	Detects methane gas concentration using MQ4 sensor and triggers alert when gas level exceeds threshold
9	Basic RTC Clock (Serial Monitor Display)	ESP8266 + DS3231 RTC	Displays real-time date, time, and temperature on Serial Monitor using DS3231 RTC
10	IoT Button Counter using ESP8266 & MicroPython	ESP8266 + 3 Push Buttons	Counts button presses (Increment, Decrement, Reset) and displays live counter on webpage
11	MicroPython-Based 8×8 LED Matrix Animation Display using ESP8266	ESP8266 + MAX7219 8×8 LED Matrix	Displays custom animations (heart beat) on 8×8 LED matrix using MicroPython
12	PIR Motion Detector using Raspberry Pi Pico 2W & MicroPython	Raspberry Pi Pico 2W + PIR Sensor	Detects motion using PIR sensor and indicates using built-in LED with MicroPython
13	Bluetooth-Based Wireless LED Control System	Raspberry Pi Pico 2W + HC-05	Wireless LED ON/OFF control using MicroPython + HC-05 Bluetooth module
14	Pico W Web Servo Controller	Raspberry Pi Pico 2W + Servo Motor	Control servo angle (0–180°) from browser via WiFi
15	ClimaPixel — Mini Weather Display	ESP32/ESP8266 + DHT11 + SSD1306 OLED	Real-time temperature & humidity display with icons on OLED using MicroPython
16	TM1637 Button-Press Counter using ESP8266 & MicroPython	ESP8266 + TM1637 + Push Button	Counts button presses and displays live counter on TM1637 4-digit display
17	IoT Relay Control Web Server (Raspberry Pi Pico 2W)	Raspberry Pi Pico 2W + Relay Module	Web-based relay control using MicroPython with a smooth slide switch UI and real-time ON/OFF status over WiFi
18	Blynk-Based IoT Relay Control (Raspberry Pi Pico 2 W)	Raspberry Pi Pico 2 W + Relay Module	Mobile app–based relay control using Blynk IoT and MicroPython with real-time ON/OFF control over Wi-Fi
19	NTP Digital Clock using TM1637 & ESP8266 (MicroPython)	ESP8266 + TM1637	Internet-synchronized digital clock using NTP with accurate HH:MM display, blinking colon, and custom segment mapping in MicroPython
20	Smart IR Object Detection System	ESP8266 + IR Sensor + LED + Buzzer	Detects the presence of an object using an IR sensor and triggers LED and buzzer alerts in real time using MicroPython
21	ESP32 Password Lock System	ESP32 + Keypad + LCD + LEDs	Implements a secure password authentication system using a keypad and LCD with visual LED feedback, developed in MicroPython
22	Blynk Controlled DC Brushless Fan	Raspberry Pi Pico W + Relay + DC Brushless Fan	Controls a DC brushless fan remotely using the Blynk IoT platform and a relay module, implemented in MicroPython
23	ESP32 Hotspot Setup	ESP32	Configures ESP32 in Access Point (Hotspot) mode using MicroPython, enabling direct device-to-device connectivity without internet
24	Voice-Controlled LED System	Arduino + Python	Controls an LED using voice commands processed in Python and sent to Arduino via serial communication
25	Arduino RGB LED Control with Python GUI	Arduino + Python	Controls an RGB LED using a Python GUI built with CustomTkinter and PyFirmata2, allowing color selection, individual LED on/off control, and brightness adjustment via sliders
26	Clap Toggle Switch using ESP32 (MicroPython)	ESP32 + MicroPython	A clap-controlled toggle switch using a digital sound sensor where one clap turns the output ON and the next clap turns it OFF, implemented with debounce logic for reliable operation
27	IR Sensor Telegram Alert using ESP32 (MicroPython)	ESP32 + MicroPython	An IR sensor–based object detection system that sends real-time alert notifications to a Telegram channel whenever motion or object presence is detected near the sensor
28	Soil Moisture Sensor Dry/Wet Detection using ESP8266 (MicroPython)	ESP8266 + MicroPython	A soil moisture monitoring system that reads analog sensor values and determines dry or wet soil conditions in real time, displaying the status on the serial monitor
29	Rain Sensor Analog Detection using ESP8266 (MicroPython)	ESP8266 + MicroPython	An analog rain detection system that reads real-time sensor values to determine rain intensity (no rain, light rain, heavy rain) and displays the status on the serial monitor
30	Ultrasonic Distance Indicator using ESP32 (MicroPython)	ESP32 + MicroPython	A distance-based indication system using an HC-SR04 ultrasonic sensor that measures real-time distance and indicates object proximity using red and green LEDs
31	WebSocket LED Control using Raspberry Pi Pico W	Pico W + MicroPython	A real-time LED control system using WebSockets where a browser communicates directly with Raspberry Pi Pico W over WiFi to turn an LED ON or OFF without page refresh
32	MQ-135 Gas Sensor with ESP32	ESP32 + MicroPython	A gas level monitoring system using the MQ-135 sensor and ESP32 to read and average analog sensor values for stable environmental gas detection
33	MQ-7 Carbon Monoxide Sensor with ESP32	ESP32 + MicroPython	A carbon monoxide monitoring system using the MQ-7 sensor and ESP32 to read and average analog sensor values for real-time CO detection
34	Servo Motor Control with Raspberry Pi Pico 2 W	Raspberry Pi Pico 2 W + MicroPython	A simulation-based servo motor control project using PWM, where the user inputs an angle (0–180°) via serial monitor and the servo rotates accordingly with safe angle clamping
35	ESP8266 Touch Sensor LED Control	ESP8266 (NodeMCU) + MicroPython	A capacitive touch-based toggle switch using the TTP223 touch sensor, where each touch alternates the state of an external LED with proper debounce handling
36	ESP8266 DHT11 Live Monitor Matplotlib and MicroPython	ESP8266 + MicroPython + Matplotlib	Real-time DHT11 temperature and humidity visualization with a dark neon-themed live graph using serial communication
37	XIAO ESP32 4-LED Control using CustomTkinter and MicroPython	XIAO ESP32-S3 + MicroPython + CustomTkinter	Desktop GUI application to control four ESP32 GPIO LEDs via serial communication using a modern dark-mode CustomTkinter interface
38	ESP32 OLED Smart UI with Eyes Animation, Time & Weather (MicroPython)	ESP32 + SSD1306 OLED + MicroPython	Interactive OLED UI featuring animated eyes, touch-based menu navigation, NTP-synced IST date & time, and live weather data using OpenWeatherMap API
39	ESP32 Stepper Motor Control using A4988 (MicroPython)	ESP32 + A4988 + NEMA 17	Stepper motor control using STEP/DIR signals with direction control, speed adjustment via delay, and serial monitoring using print statements
40	Pico W Async LED Control (MicroPython)	Raspberry Pi Pico W	Async web server using uasyncio to control onboard LED via browser with ON/OFF buttons and fetch-based requests
41	EEPROM Simulation using MicroPython (ESP32)	ESP32	File-based EEPROM emulation using MicroPython with byte-level read/write and persistent string storage
42	ESP32 DC Motor Web Speed Control (MicroPython)	ESP32 + L298N	Web-based slider controlled DC motor speed system using PWM, MicroPython web server, and L298N driver
43	Temperature Based LED Indicator (MicroPython)	ESP32 + DHT22	Beginner-friendly ESP32 project that reads temperature data from DHT22 and visually indicates temperature levels using LEDs
44	Flask LED Control using MicroPython	ESP32 / Pico W	Beginner-friendly IoT project where a Flask web server controls an LED on ESP32 or Pico W through HTTP polling using MicroPython
45	Smart Cooling System using ESP8266	ESP8266+DHT11+BRUSHLESS FAN	Beginner-friendly IoT project that automatically controls a fan using DHT11 temperature sensor and an active-LOW relay with MicroPython
46	Soil & Weather Monitoring using ESP8266 and ThingSpeak	ESP8266 + DHT11 + Soil Sensor	Beginner-friendly IoT project that monitors soil moisture, temperature, and humidity and visualizes the data on the ThingSpeak cloud using MicroPython
47	Smart Irrigation System using XIAO ESP32-S3 and Blynk	XIAO ESP32-S3 + Soil Sensor + Relay + Pump	A smart irrigation system that monitors soil moisture in real time and allows manual water pump control via the Blynk IoT platform using MicroPython
48	HTTP-Based DHT11 Data Logger using Raspberry Pi Pico W	Raspberry Pi Pico 2W + DHT11	A simple IoT data logging system that reads temperature and humidity from a DHT11 sensor and sends the data via HTTP POST to a Flask server, where it is stored in a CSV file for analysis
49	ThingsBoard RPC LED Control & DHT11 Telemetry using Raspberry Pi Pico 2 W	Raspberry Pi Pico 2 W + DHT11	A cloud-connected IoT system using MicroPython where a Raspberry Pi Pico 2 W sends temperature and humidity data to ThingsBoard via MQTT and allows remote LED control using RPC from a dashboard
50	ESP32 BMP180 Atmospheric Monitoring with Blynk IoT	ESP32 + BMP180	A cloud-connected IoT system using MicroPython where an ESP32 measures temperature, atmospheric pressure, and altitude using the BMP180 sensor and sends real-time data to the Blynk IoT dashboard via Wi-Fi
51	ESP8266 Smart Home Automation using MicroPython & Blynk	ESP8266 + DHT11 + Relay	A cloud-based smart home automation system where an ESP8266 controls home appliances via relay and monitors temperature & humidity using DHT11, with real-time control and monitoring through the Blynk IoT dashboard over Wi-Fi
52	IoT Sensor Anomaly Detection using ESP8266 & ThingSpeak	ESP8266 + DHT11 + LDR + MATLAB	An IoT-based environmental monitoring system that uploads real-time sensor data to ThingSpeak and performs statistical anomaly detection using Z-score analysis in MATLAB, with visualization and outlier classification
53	Smart IoT Gas Monitoring System	ESP32 + MQ Gas Sensor + DHT11 + Flask + Chart.js	An AI-inspired end-to-end IoT gas monitoring system that streams real-time sensor data to a Flask backend, applies moving-average based anomaly detection for SAFE/DANGER classification, logs data for analytics, and visualizes live environmental insights on an interactive web dashboard
54	ESP8266 ESP-NOW LED Control	ESP8266 + ESP-NOW + MicroPython	A low-latency wireless LED control system using ESP-NOW protocol, where one ESP8266 acts as a transmitter and the other as a receiver, enabling real-time device control without WiFi infrastructure
55	ESP8266 ESP-NOW Button to LED Control	ESP8266 + ESP-NOW + MicroPython	A low-latency peer-to-peer wireless communication system where a push button on one ESP8266 toggles an LED on another ESP8266 without WiFi or access point
56	ESP8266 ESP-NOW 4-Channel Wireless Relay Controller	ESP8266 + ESP-NOW + MicroPython	A wireless 4-channel relay control system using two ESP8266 boards, where push buttons on the sender toggle relays on the receiver via low-latency ESP-NOW communication without WiFi
57	ESP-NOW Smart Relay & Sensor System	ESP8266/ESP32 + ESP-NOW + MicroPython	A bidirectional ESP-NOW based smart relay and sensor system where a sender control panel toggles relays on a receiver and receives real-time DHT temperature and humidity data displayed on an OLED
58	NTP Synchronized LED Matrix Clock	ESP32 + MAX7219 + MicroPython + NTP	A real-time internet-synchronized digital clock using chained MAX7219 LED matrices, showing HH:MM with NTP time sync and serial debugging output
59	AQI-ESP - IoT AQI Monitoring System	ESP32 + MicroPython + Flask + MQ135 + MQ7 + PM2.5	A real-time air quality monitoring system using ESP32 and multiple gas sensors, calculating AQI via Flask backend and displaying live results on SSD1306 OLED with status like Good/Moderate/Unhealthy/Hazardous
60	Student Management System - ESP32	ESP32 + MicroPython + SH1106 OLED + LittleFS + ujson	A serial command-based student record management system running on ESP32, storing up to 1000 student records in JSON format on onboard flash memory with live navigation and display on SH1106 OLED
61	OTA Update - Raspberry Pi Pico 2 W	Raspberry Pi Pico 2 W + MicroPython + GitHub + urequests	A WiFi-based OTA (Over-the-Air) update system that automatically downloads and applies new code from GitHub on every boot without physically connecting the device to a computer
62	Smart Indoor Security System	ESP32 + PIR Sensor + 4x4 Keypad + MicroPython + Favoriot IoT	A motion-triggered keypad security system that detects intruders, requests a password, logs all events to the Favoriot IoT cloud, and sends email alerts on unauthorized access
63	ESP32 BLE LED Control	ESP32 + MicroPython + Bluetooth Low Energy (BLE)	A BLE UART-based LED control system that allows wireless toggling of the onboard LED via smartphone commands, with connection status indication and real-time state feedback
64	microclawup — AI Powered ESP32 GPIO Controller	ESP32 + Groq AI + Telegram	AI-powered natural language GPIO controller using MicroPython, Groq AI and Telegram bot
65	MicroPython Watch	Xiao ESP32-S3 + SSD1306 OLED + OpenWeatherMap	NTP time sync + live weather on a 0.96" OLED display
66	micropidash — IoT Web Dashboard	Raspberry Pi Pico 2W / ESP32	Non-blocking web dashboard with real-time sync, dark mode & sensor monitoring via uasyncio
67	Pulse Monitor — Heart Rate on OLED	ESP32 +Pulse Sensor+ OLED	Real-time BPM display with scrolling waveform & pixel-art heart on SSD1306 OLED via ADC peak detection
68	Joystick Servo Control	Raspberry Pi Pico 2W + SG90 Servo + Joystick Module	Smooth 0°–180° servo control via joystick X axis using PWM & 5-sample ADC averaging in MicroPython
69	Joystick Direction Display	Raspberry Pi Pico 2 + KY-023 Joystick + SSD1306 OLED	Real-time joystick direction detection displayed on OLED with raw ADC values using I2C and MicroPython
70	Dual IR Entry/Exit Detector with Telegram	ESP32 + HW-201 IR Sensor x2 + Red LED + Green LED	Dual IR sensor-based entry/exit detection system — red LED stays ON while object is inside, green LED blinks on exit, with real-time Telegram alerts
71	Wi-Fi Controlled 4WD Robot Car	ESP32 + L298N Motor Driver x2 + TT DC Motor x4 + 4WD Chassis	Wi-Fi controlled 4WD robot car — ESP32 hosts a web server, browser-based interface with Forward, Backward, Left, Right, Stop controls over local Wi-Fi
72	RFID Basic Access Control System	ESP8266 NodeMCU + MFRC522 + Green LED + Red LED	RFID based access control — ESP8266 reads MIFARE card UID over SPI, checks against authorised list, green LED for granted and red LED blinks for denied
73	RFID Attendance Logger	ESP32 + MFRC522 + Google Sheets	RFID based attendance system — scans student cards, logs name, IN/OUT status and NTP timestamp to Google Sheets via Apps Script webhook
74	RFID Relay Control System	Raspberry Pi Pico 2 + MFRC522 + 1 Channel Relay + 5V Brushless Fan	RFID based relay control — authorized card tap toggles 5V brushless fan ON or OFF via active low relay module
75	ESP-NOW RFID Display	ESP8266 x2 + MFRC522 + SSD1306 OLED	ESP-NOW based RFID system — one ESP8266 scans card and sends UID wirelessly, second ESP8266 receives and displays UID on OLED
76	Bidirectional_ESP_NOW Communication_with_Dual_Sensor_Nodes	ESP8266 x2 + DHT11 x2 + SSD1306 + SH1106	Two ESP8266 nodes simultaneously send and receive DHT11 sensor data over ESP-NOW, each displaying local and remote readings on OLED
77	Battery_Monitor_with_Blynk_IoT	ESP8266 + TP4056 + 18650 + 2x10kΩ	Real-time Li-ion battery voltage and percentage monitoring using voltage divider, lookup table calibration, pushed live to Blynk IoT dashboard
78	IoT-Based DSM Smart Metering Prototype	ESP32 + ZMPT101B + ACS712 + Blynk IoT + MATLAB	Real-time AC voltage and current monitoring with power calculation, demand-side management relay control, and live energy dashboard on Blynk IoT with MATLAB-based data analysis
79	GC9A01 Round Display Smartwatch	ESP32 + Xiao ESP32-S3 + GC9A01 + OpenWeatherMap + NTP	Robot eyes boot animation with blink effect, typing animation, NTP-synced real-time clock, live weather via OpenWeatherMap API, and flicker-free display rendering on 1.28" round TFT
80	NeoPixel 8-Ring Web Controller	Pico 2W + WS2812B NeoPixel + MicroPython	Browser-based IoT controller with rainbow cycle, breathe effect, solid color, real-time brightness and color control via non-blocking HTTP server on Pico 2W

Key Highlights

• Step-by-step progression from basic to advanced IoT concepts
• Hands-on experience with real hardware and simulations
• IoT dashboards using Web Server, WebSocket & Blynk
• Python & Matplotlib-based live data visualization
• Beginner-friendly documentation & explanations
• Clean, folder-wise project organization

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Roadmap

• Complete 100 IoT projects in 100 days
• Each project includes:
• main.py
• Detailed README.md
• Circuit diagram / simulation
• Upcoming focus areas:
• Cloud & IoT dashboards
• OTA & firmware updates
• Power optimization
• Smart home & automation systems
• AI-assisted IoT (basic level) ation, and more

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Author

Kritish Mohapatra
Third Year B.Tech – Electrical Engineering
Interests: IoT | Embedded Systems | MicroPython | Automation
Building in public through #100DaysOfIoT

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