Tempro is a low-cost, wireless temperature and humidity monitoring system built around the NodeMCU ESP8266 and DHT22 sensor. Five compact IoT nodes (four active + one spare) relay real-time data through a common Wi-Fi router to a central dashboard or server.
- Accurately monitor ambient temperature and humidity
- Transmit sensor data wirelessly over Wi-Fi (MQTT or HTTP)
- Operate each node from a portable battery pack
- House electronics in a durable enclosure
- Connect all nodes on a single, router-based network
| Component | Qty | Unit Price (INR) | Sub-Total (INR) |
|---|---|---|---|
| NodeMCU ESP8266 | 1 | ₹300 | ₹300 |
| DHT22 Sensor | 1 | ₹250 | ₹250 |
| 1.5 V Batteries | 3 | ₹20 | ₹60 |
| Battery Holder (3×1.5 V) | 1 | ₹50 | ₹50 |
| Enclosure / Box | 1 | ₹30 | ₹30 |
| Hook-up Wires | — | ₹50 | ₹50 |
| Misc. (HW, glue, etc.) | — | ₹50 | ₹50 |
| Total per Node | ₹790 |
| Item | Qty | Price (INR) | Sub-Total (INR) |
|---|---|---|---|
| Five Nodes (4 active + 1 spare) | 5 | ₹790 | ₹3,950 |
| Wi-Fi Router (shared) | 1 | ₹1,200 | ₹1,200 |
| Other Miscellaneous Expenses | — | — | ₹700 |
| Grand Total | ₹5,850 |
- DHT22 for high-accuracy temperature ± humidity sensing
- NodeMCU ESP8266 with USB for quick flashing and Wi-Fi connectivity
- Battery-powered (3 × 1.5 V AAA → 4.5 V) for portable deployment
- Wireless data via MQTT or HTTP protocols
- Modular design – nodes are simple to swap, extend, or upgrade
- Replace alkaline cells with rechargeable lithium + solar charging
- Integrate a small OLED display for on-device read-outs
- Develop a web/mobile dashboard for centralized visualisation
- Add automatic alerts when conditions exceed safe thresholds
At just ₹790 per node and ₹5,850 for the complete five-node kit, Tempro delivers an affordable, scalable, and easily serviceable solution for continuous environmental monitoring—ideal for classrooms, labs, smart homes, and agricultural settings.