Campus Energy Monitor | Live IoT Dashboard

🌡 Temperature

--°C

DS18B20

🌀 Fan Speed

--%

💡 PIR / Light

--%

PIR: --

⚡ Total Power

-- W

PZEM L1+L2+L3

Phase L1

-- V

-- W

Phase L2

-- V

-- W

Phase L3

-- V

-- W

--°C

🌡 Temperature

0°C60°C

--%

🌀 Fan Speed

0%100%

-- W

⚡ Total Power

0 W3 kW

📊 Power Factor

01.0

🖶 LCD Display (live from ESP32)

== ENERGY MONITOR ==

Tmp: --.- C Fan: 0%

PIR:Idle WiFi:--

Waiting for MQTT...

🌏 Commands sent via MQTT → HiveMQ Cloud → ESP32 in lab. Response within ~1 second.

🌀 Fan Control

Speed: --% • Mode: --

💡 Enclosure Light

Brightness: --% • PIR: --

🔦 IR LED (GPIO 32)

State: --

🔔 Buzzer (GPIO 27)

Beep count (1–5)

⬛ Emergency

Turn everything off

📷 IR Remote Reference (NEC remote, GPIO 14 — hardware-side only)

Fan Speed
1 → Fan OFF | 2 → 30%
3 → 60% | 4 → 100%
5 → AUTO (temp-based)

Light
VOL+ → Light ON (full)
VOL- → Light OFF

LED (GPIO 32)
100+ → LED ON
200+ → LED OFF

Buzzer
CH+ → Beep 1×
CH → Beep 2×
CH- → Buzzer stop

Other
0 → ALL OFF
PREV → Force temp read
EQ → Force PZEM read

Physical fan button (GPIO 19) cycles: OFF → 30% → 60% → 100% → OFF

⚡ Phase L1 (0x01) N/A

Voltage--

Current--

Power--

Power Factor--

Frequency--

Energy--

⚡ Phase L2 (0x02) N/A

Voltage--

Current--

Power--

Power Factor--

Frequency--

Energy--

⚡ Phase L3 (0x03) N/A

Voltage--

Current--

Power--

Power Factor--

Frequency--

Energy--

📈 Cloud Data Platforms

📈

Grafana Cloud

Historical dashboard

▶ Last 1 Hour ▶ Last 24 Hours ▶ Last 7 Days

📊

ThingSpeak

IoT cloud storage (dual-channel)

📊 Ch-A: Voltage / Current / Power 📊 Ch-B: PF / Freq / kWh 🔎 Verify Ch-A Data 🔎 Verify Ch-B Data

📄

Google Sheets & Tableau

Spreadsheet & visual analytics

📄 Google Sheets (Data) ⎈ Apps Script Webhook 📈 Tableau Dashboard

📊 ThingSpeak — Historical Trends

Data from ThingSpeak Ch-A (Voltage/Current/Power) & Ch-B (PF/Freq/kWh). 6 charts — 15 s updates from ESP32.

📱 MQTT Connection (HiveMQ Cloud)

HiveMQ Host From HiveMQ Cloud dashboard — do NOT include wss:// or port

MQTT Username

MQTT Password

📈 Grafana

Grafana Dashboard URL Use the public share link from your Grafana dashboard

🧠 AI Brain — Keys & Fallback

Gemini API Keys (one per line — auto-rotate on rate limit) Free 15 req/min per key — aistudio.google.com. Keys rotate automatically on 429 errors.

DeepSeek API Key (fallback when all Gemini keys fail) platform.deepseek.com — very cheap ($0.07/M tokens). Used as last resort.

Active: Gemini key 1/4 — fallback: DeepSeek

🎤 AI Voice Settings

Auto-fallback chain (best → last resort):
🌟 ElevenLabs → ☁ Azure → ⭐ StreamElements → 🔊 VoiceRSS → 🌐 Browser

Primary Voice Engine

ElevenLabs API Key Free 10K chars/month — elevenlabs.io → Developers → copy key.

ElevenLabs Voice

Speech Rate — 1.0× Applies to StreamElements, VoiceRSS and Browser. ElevenLabs uses its own pacing.

⚠ Danger Zone

Reset all dashboard configuration to factory defaults. Clears API keys, MQTT credentials, TTS settings, Personalize/schedule settings, and chat history. The page will reload.

💡 PIR Motion Light

Hold time after last motion — 5s Light stays ON this long after motion stops (1 – 120 seconds). Sent to ESP32 via MQTT.

Brightness when triggered — 100% PWM brightness level the enclosure light fades up to on motion (10 – 100%).

🌀 Fan Temperature Thresholds

Fan 30% above

°C

Fan 60% above

°C

Fan 100% above

°C

Critical / 3 beeps

°C

OFF → 30% at 28°C → 60% at 32°C → 100% at 36°C → 💥 CRITICAL at 40°C

⏰ LED Light Scheduler

Enable LED schedule

✅ Turn ON at

❌ Turn OFF at

⚠ Scheduler runs only while this browser tab is open — it sends MQTT commands at the set times.

📷 Camera — TTGO OV2640

Auto-flash LED on snapshot

GPIO 32 LED fires before each snapshot as light source, turns off when image received

PIR auto-snap on motion

Enables PIR on the TTGO on page load. Snaps on motion (30 s cooldown in firmware).

Rapid snapshot mode

Auto-snap at fixed interval while camera is ON (pseudo-stream)

Every

⚠ Keep rapid mode OFF when not needed — increases TTGO heat and HiveMQ traffic.

📧 Email Reports

Enable scheduled reports

Send reports to

Frequency

Send at

Report includes: temperature, fan, PIR, power (L1/L2/L3), LED state, uptime.

🔔 System Alerts

🌡 Temperature

Enable alert

Trigger above °C

⚡ Total Power

Enable alert

Trigger above W

🔌 MQTT Connection

Alert on disconnect

Shows toast when MQTT drops

📧 Alert Delivery

Email on alert

Uses address from Email Reports above

↻ Reset Personalize to Defaults

Resets all schedule, alert, PIR, fan threshold, camera and email settings to factory defaults.

🤖 AI Energy Assistant

ESP32: /fan off • /fan low • /fan med • /fan high • /fan auto • /light on • /light off • /led on • /led off • /beep • /all off | Camera: /cam on • /cam off • /cam snap • /pir on • /pir off

ℹ About This System

Campus Energy Monitor is an ESP32-based 3-phase energy monitoring system built as a CPUT Final Year Project. It delivers real-time energy data via MQTT, full remote hardware control, and an AI assistant with live sensor context — all accessible from anywhere in the world through this cloud dashboard.

Key Features

3-Phase Energy Metering — PZEM-004T on L1, L2, L3 (voltage, current, power, PF, frequency, kWh)
Temperature Monitoring — DS18B20 with automatic PWM fan control (4 threshold levels)
Remote Fan / Light / LED / Buzzer control via MQTT command topics
PIR Motion-activated enclosure light — HC-SR501 with brightness fade
Real-time MQTT sync — HiveMQ Cloud broker, sensor state published every 5 seconds
AI Energy Assistant — Gemini 2.5 Flash with live MQTT sensor context in system prompt
AI Voice Call — full-duplex conversation, continuous speech recognition + TTS
AI Video Call — camera feed with automatic frame analysis every 30 seconds
Multi-provider TTS — Browser, Azure Neural, ElevenLabs, VoiceRSS (configurable in Settings)
Slash commands routed via MQTT: /fan off /fan auto /light on /led off /beep /all off
Grafana Cloud tab — embed historical charts and alerts dashboard
Cloudflare Pages — global HTTPS, zero cold-start, custom domain ready

ESP32-WROOM-32U PZEM-004T x3 DS18B20 HiveMQ Cloud Gemini 2.5 Flash Cloudflare Pages CPUT Final Year 2026

Henock HNK

Computer Engineer

Computer Engineer specializing in software development, scientific computing, networking, electronics, and embedded systems with extensive experience in technical tutoring. I believe technology should solve real problems. My journey across tech — from electronics and industrial to computer engineering — taught me that the best solutions come from curiosity, persistence, and the courage to take unconventional paths.

Today I bridge hardware and software, turning ideas into working systems — from IoT devices monitoring energy consumption to web applications solving client challenges. I also teach, because sharing knowledge deepens understanding. When a student grasps a complex concept, that is engineering success too.

CPUT Final Year 2026 Supervisor: M. Ratshitanga Student No: 219383693

📌 Book Services 🌐 Portfolio

💻

🎥

🎶

📲

👥

📷 Lab Camera — TTGO OV2640

Points at PZEM-004T open-CT connections • MQTT snapshot on demand

Camera offline

⚡ Rapid Snap

Auto-snap continuously — starts camera automatically

⚠ Keep camera OFF when not needed — reduces heat and extends lifespan over long experiments.

💡 Lab LED — GPIO 32

OFF

Auto-flash on snapshot

LED fires briefly before each snapshot as light source, turns off when image received

⏱ Auto Snapshot

Auto snapshot every

Camera must be ON for auto-snapshot to work. Scheduler runs while this browser tab is open.

🎦 Last Snapshot

No snapshot yet

📷

Turn camera ON then press Take Snapshot

🖼 Snapshot Gallery

Snapshots are saved locally in this browser only (not synced across devices) — up to 20 most recent. Click a thumbnail to view full size, ⬇ to download, × to delete.