Smart Garbage IoT (ESP32-WROVER + WebUI/REST + Blynk)

A practical IoT prototype for smart waste-bin monitoring in sustainable-city scenarios. The device runs on an ESP32-WROVER, samples low-cost sensors on-device, applies stability logic (majority vote + timers + latching), and exposes status locally (WebUI + REST) and remotely (Blynk).

Demo (3 min)

• YouTube: https://www.youtube.com/watch?v=eFk5osx5mvY

Live Dashboard (Blynk)

• https://blynk.cloud/dashboard/160575/global/devices/1/organization/160575/devices/521178/dashboard

Architecture

Screenshots

Local WebUI

• Default:
• Fire:
• Filled:
• Tilted:

Blynk Dashboard

• Default:
• Filled and Tilted:

Features

• Fill monitoring (KY-032, top-mounted upside down) → outputs a service-needed indicator.
• Fire detection (KY-026 D0) → triggers traffic LEDs + buzzer (fire-only).
• Tilt-over detection (KY-020) → event-level reporting (latched + stable).
• Ambient telemetry (DHT11) → temperature & humidity.
• Local WebUI + REST API: /api/status, /api/events, /api/cmd
• Blynk cloud dashboard for remote monitoring & basic controls.

Hardware List

• ESP32-WROVER
• KY-026 Flame sensor (D0 + A0)
• KY-032 IR obstacle sensor (fill indicator, top-mounted inverted)
• KY-020 Tilt sensor
• DHT11 (KY-015) temperature/humidity module
• Buzzer + traffic LEDs (R/Y/G)

Pin Mapping (ESP32)

Function	Module	GPIO
Flame D0	KY-026	26
Flame A0 (ADC1)	KY-026	35
Fill DO	KY-032	27
Tilt DO	KY-020	33
DHT11 signal	DHT11	25
Buzzer	Alarm	18
Red LED	Alarm	19
Yellow LED	Alarm	21
Green LED	Alarm	22

Blynk Virtual Pins

VPin	Name	Type	Meaning
V0	FireDetected	Telemetry	1 if fire detected via KY-026 D0 (alarm source)
V1	FlameStrengthFilt	Telemetry	EMA filtered flame strength (visibility only)
V2	FlameA0raw	Telemetry	Raw ADC value from KY-026 A0 (visibility only)
V3	BinFillPct	Telemetry	Fill percentage inferred from KY-032 logic
V4	TempC	Telemetry	DHT11 temperature (°C)
V5	HumPct	Telemetry	DHT11 humidity (%)
V6	TiltDetected	Telemetry	1 if tilt is latched
V10	FlameThreshold	Control/Telemetry	Threshold kept for visibility (A0 detection disabled)
V11	MuteBuzzer	Control	Mute fire alarm buzzer
V12	Silence10Min	Control	Timed silence trigger
V13	KY032 ActiveLow	Control	KY-032 polarity config
V14	FlameD0 ActiveLow	Telemetry	Display-only (fixed polarity)
V15	KY026 ActiveLow	Telemetry	Display-only (fixed polarity)
V16	KY020 ActiveLow	Control	KY-020 polarity config

REST API (Local)

• GET /api/status → JSON status (fire/fill/tilt/DHT/buzzer/RSSI/uptime)
• GET /api/events → ring-buffer events
• POST /api/cmd → commands (mute/unmute/silence, polarity flips, requirement settings)

Example:

curl http://<ESP32_IP>/api/status

Build / Run (Arduino IDE)

1. Copy firmware/esp32_code/secrets.example.h to firmware/esp32_code/secrets.h and fill:
   • BLYNK_AUTH_TOKEN
   • WIFI_SSID, WIFI_PASS
2. Open firmware/esp32_code/esp32_code.ino
3. Select board: ESP32 WROVER Module
4. Upload, then check Serial Monitor for the device IP.
5. Open WebUI: http://<ESP32_IP>/

Documentation (Report PDF)

• SmartGarbageSystem_Report.pdf

Made by

Oğuzhan Alasulu & Serkan Kıyaklı