Build a Portable GPS-Enabled Temperature Heat Map Logger with ESP32 and MLX90614

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

Walk through a data centre, server room, or any urban environment, and this logger silently captures GPS coordinates and surface temperatures of every rack, floor tile, or street surface. The ESP32 backpack reads from an MLX90614 infrared thermometer and a DHT22 ambient sensor, time-stamping everything with a DS3231 RTC before writing to a microSD card. Back at your desk, overlay the CSV data on a map to reveal hidden hotspots, thermal gradients, and environmental stress patterns that thermostats alone will never show.

What You'll Build

You will assemble a handheld, battery-powered data collection tool that combines GPS, infrared thermometry, humidity sensing, and precision timekeeping. The final build fits in a custom enclosure, logs continuously for hours on two 18650 cells, and displays real-time readings on a 0.96-inch OLED. With the logged SD card, you can plot a heat map of any indoor or outdoor space-from a 10,000-server facility to a neighbourhood known for uneven street-level heat.

What You'll Learn

• Parallax-free surface temperature measurement with the MLX90614 IR sensor across varying emissivities
• Parsing NMEA sentences from a NEO-6M GPS module and syncing fixes with DS3231 RTC timestamps
• Designing a power-efficient mobile data logger with LM2596 buck converter, TP4056 charging, and deep sleep strategies on the ESP32
• Persistent CSV logging to microSD, including header generation, buffer management, and file recovery after power loss

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is built for B.Tech ECE and EEE students finalising IoT capstone projects at IITs, NITs, VIT, or BITS Pilani. It also serves facility engineers who need a mobile thermal audit tool for server rooms, data centres, and cold storage, as well as urban planners and environmental researchers mapping heat island effects for Smart India Hackathon challenges or municipal fieldwork.

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.

Choose your assembly option:

• Soldering Kit - 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
• Breadboard Combo - 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.