Build an Auto-Open Touchless Trash Can with ESP32, DHT22 & HC-SR04 – Smart Bin IoT Kit

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Create a hygienic, hands-free trash can that springs open the moment you wave your hand. This kit goes far beyond a simple sensor circuit: you’ll turn an ESP32 into a bidirectional WebSocket server that pushes temperature, humidity, and distance readings to a live browser dashboard every 100 milliseconds. Ideal for smart-home enthusiasts and students who want to understand real-time data streaming, this project blends physical automation with modern web protocols.

What You'll Build

You’ll assemble a working prototype of a touchless trash bin with an auto-open lid triggered by an ultrasonic sensor. A browser-based dashboard displays live graphs of ambient temperature and humidity from the DHT22, plus proximity data from the HC-SR04. The relay module lets you connect an external motor (not included) so the lid physically opens on approach, and you can even trigger the relay remotely from the dashboard.

What You'll Learn

• Configure an ESP32 as a Wi-Fi access point and WebSocket server for real-time, low-latency data exchange.
• Interface the DHT22 temperature and humidity sensor and stream calibrated readings every 100 ms.
• Use an HC-SR04 ultrasonic sensor to detect hand distance and trigger logic for automatic lid control.
• Drive a 5V relay module to switch a DC motor or solenoid, translating digital commands into physical movement.

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

B.Tech ECE and EEE students will find this an ideal mini-project or Smart India Hackathon prototype. ATL Tinkering Lab mentors can use it to teach IoT fundamentals with a visible, tangible outcome. CBSE Class 12 students exploring sensor integration and networking will also build strong foundational skills for university labs and competitive events like VIT’s graVITas or BITS Pilani’s tech fests.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.