Build a Smart Blind Stick with ESP32 & DHT22 – REST API 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 an intelligent white cane that goes beyond simple beeping. The ESP32 reads an ultrasonic distance sensor and two light-dependent resistors to detect obstacles and ambient light, hosts its own REST API on local WiFi, and serves real-time JSON data. Any client—laptop, smartphone, or another microcontroller—can query the stick’s endpoints and build custom auditory or haptic feedback. It’s an accessibility project that combines embedded sensing, networking, and API design in one intermediate build.

What You'll Build

A compact prototyping circuit that mounts an HC-SR04 distance sensor, an LDR pair, and a DHT22 onto a breadboard. The ESP32 creates a WiFi access point and exposes GET endpoints like /distance, /light, and /temperature. You’ll demonstrate how a visually impaired user could pair the stick with a smartphone app that reads JSON, making navigation data available through voice output or vibration patterns.

What You'll Learn

• Configure an ESP32 as a WiFi access point and web server
• Read HC-SR04 ultrasonic sensor using pulse timing and return distance in centimeters
• Interface LDRs with voltage dividers and read analog values for ambient light detection
• Structure RESTful GET endpoints, parse query parameters, and serve sensor JSON

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11‑12 students exploring IoT and assistive technology for science exhibitions, B.Tech ECE/EEE undergraduates learning embedded systems and sensor fusion, and participants in Smart India Hackathon or ATL Tinkering Labs. The REST API angle makes it a strong foundation for capstone projects at IIT, NIT, VIT, or BITS that require remote data access or mobile app integration.

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.