Adaptive Lighting Circadian Controller Kit with ESP32 + LED
Build an Adaptive Circadian Lighting Controller with ESP32 and Dual LED Strips
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine waking up to a gentle, warm glow that imperceptibly shifts to crisp cool daylight as the morning progresses, then eases back into amber warmth by evening — all without touching a switch. This kit hands you the hardware and firmware blueprint to build a stand‑alone circadian controller that reads ambient light via BH1750, tracks time from a DS3231 RTC, and drives a pair of 12 V warm‑white and cool‑white LED strips through MOSFETs. The result is a lighting fixture that mimics the sun’s natural rhythm, perfect for home offices, bedrooms, or any space where light quality influences mood and productivity.
What You'll Build
You will assemble a fully enclosed controller that sets colour temperature and brightness according to a pre‑defined circadian curve. An OLED screen displays real‑time readings: lux, colour temperature in Kelvin, and the current time. The system runs offline after programming, making it a reliable, low‑maintenance addition to your home automation setup. Debugging headers let you tweak the algorithm later if you want to adjust the curve or add WiFi‑based time sync.
What You'll Learn
- Program the ESP32 to generate three independent PWM channels for smooth colour temperature mixing without flicker.
- Interface I2C sensors (BH1750 lux meter, DS3231 RTC, SSD1306 OLED) and handle multiple devices on a single bus.
- Design a MOSFET driver stage with gate resistors and pull‑downs that safely switches 12 V strips from a 3.3 V microcontroller.
- Implement a circadian curve algorithm that interpolates between warm‑white and cool‑white channels based on time of day and optional ambient light feedback.
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| DS3231 RTC | 1 |
| IRF540N MOSFET | 3 |
| 10kΩ Resistors | 10 |
| 100Ω Gate Resistors | 5 |
| BH1750 | 1 |
| 0.96in OLED | 1 |
| LM2596 Buck Converter | 1 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 12V LED Strip Warm | 1 |
| 12V LED Strip Cool | 1 |
| 12V 3A PSU | 1 |
| Enclosure Box | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify MOSFET gate voltage, I2C pull‑up values, and buck converter noise | Pre‑tested as a system; no PWM flicker or sensor conflicts |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging wiring and firmware | Hours, with step‑by‑step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Designed for B.Tech ECE and EEE students who want a challenging embedded IoT project, engineering graduates building a portfolio piece for placements, and seasoned makers experimenting with smart lighting. It’s also a fit for Smart India Hackathon teams prototyping assistive home tech, and advanced ATL mentors demonstrating real‑world sensor integration. A basic familiarity with Arduino IDE or PlatformIO is expected, and a soldering iron is included because you’ll enjoy putting the driver board together.
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.
What if I get stuck during the build?
Open the AI companion from the QR code for step‑by‑step debugging; if that doesn’t resolve it, drop a message on WhatsApp and an engineer will help within a few hours.
Can I use this kit with a different LED strip voltage?
The kit is designed for 12 V strips. For 24 V strips you’ll need different MOSFETs and a suitable power supply — not included.
Does the controller work without WiFi after programming?
Yes, once the firmware is flashed the ESP32 runs entirely offline using the DS3231. WiFi is only needed for initial upload or optional remote monitoring.
How accurate is the circadian curve?
The DS3231 is temperature‑compensated and accurate to ±2 ppm; the curve parameters are adjustable in the code, so you can fine‑tune the transition times and colour temperatures to match your local sunrise/sunset.
Adjusts LED colour temperature and brightness throughout day following circadian curve from DS3231 RTC.
What's in this kit
- ESP32 Dev Board
- DS3231 RTC
- IRF540N MOSFET x3
- 10kΩ Resistors x10
- 100Ω Gate Resistors x5
- BH1750
- 0.96in OLED
- LM2596 Buck Converter
- 100nF Caps x10
- PCB Prototype Board x2
- 12V LED Strip Warm
- 12V LED Strip Cool
- 12V 3A PSU
- Enclosure Box
- Soldering Iron
- Solder Wire
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.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items