27 lines
961 B
Markdown
27 lines
961 B
Markdown
---
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type: permanent
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status: verified
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source: "manohargupta.com/journal/esp32-dht11-iot (2026-01-25)"
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tags: [knowledge, iot, hardware]
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---
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# 🌡️ IoT: ESP32 + DHT11 Monitoring
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> First full-stack IoT build — a home-office temperature/humidity monitor (~$10).
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## Hardware
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- **ESP32** — microcontroller with WiFi + Bluetooth
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- **DHT11** — affordable temp/humidity sensor
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- Breadboard + jumper wires
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## Architecture
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`ESP32 (Arduino sketch, reads every 10s)` → **MQTT** → **Node.js backend** (store) → **React frontend** (subscribes to MQTT topic, real-time display).
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## Lessons (his words)
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- Microcontrollers are more accessible than expected
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- **MQTT is elegant** for IoT comms
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- Satisfying to see physical sensors drive web software
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## Next
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Off-grid: a solar panel to power a fully sun-powered sensor setup → ties to [[Renewables Overview|solar]] interest.
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## Related
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[[Engineering Overview]] · [[MOC - Software]] · [[Renewables Overview]]
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