UV Exposure Unit Controller Kit with Arduino Uno + Relay
Take Control of Photographic Exposure with the Arduino-Powered UV Timer Kit
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 crafting your own printed circuit boards at home or producing deep-blue cyanotype art prints without guesswork. This kit puts you in command of a calibrated UV exposure unit that maintains precise timing, so every development comes out crisp and repeatable. Whether you are etching a custom PCB for a college project or experimenting with alternative photographic processes, the DS3231 real-time clock and LCD countdown ensure you never under- or over-expose again.
What You'll Build
You will assemble a standalone exposure controller that drives a 12-LED 395nm ultraviolet array through a relay. Using three tactile buttons and a 16x2 LCD display, you can set exposure durations from seconds to hours. The system counts down in real time, automatically switching off the UV LEDs when the cycle finishes, giving you professional-grade consistency for each photo-resist coated board or sensitized paper.
What You'll Learn
- Interfacing a DS3231 RTC module with Arduino for accurate timekeeping down to the second
- Driving a 16x2 LCD over I2C to display timer status and user prompts
- Building a transistor-based switching circuit to safely control the 12V UV LED array from a 5V relay
- Programming menu-driven logic for set-time, start, and stop functions using button inputs
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DS3231 RTC | 1 |
| 5V Relay Module | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| Tactile Button | 3 |
| UV LED 395nm | 12 |
| BC547 Transistor | 2 |
| 100Ω Resistors | 12 |
| 1N4007 Diode | 3 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 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 every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | 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
This project fits perfectly into CBSE Class 12 electronics practical work, B.Tech ECE/EEE fabrication labs, and ATL Tinkering Lab initiatives. It’s ideal for Smart India Hackathon teams needing quick PCB prototyping capability and for IIT/NIT/VIT/BITS students building equipment for their engineering clinics. Hobbyists interested in DIY PCB manufacturing or cyanotype photography will also find the timer’s precision indispensable.
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?
Scan the QR code inside the box to chat with the AI companion that understands your UV timer circuit. It can answer wiring questions, debug logic, and guide you step by step. You can also send photos over WhatsApp for human assistance.
Can I expose PCBs and cyanotype prints with the same timer?
Yes. Cyanotype typically requires longer exposures (several minutes to hours), while PCB photo-resist needs shorter bursts. The adjustable timer from 1 second to 99 hours covers both, and the AI companion suggests starting points for common materials.
Is soldering experience required?
Some soldering is necessary to assemble the UV LED array and connect the control board. The kit includes a soldering iron and solder wire, and the instruction manual provides clear soldering diagrams for all connections.
How do I determine the right exposure time for my PCB?
The exposure time depends on your UV LED distance, board sensitivity, and the transparency film’s darkness. We provide a calibration chart in the manual, and the AI build companion includes a calculator where you input your setup to get a recommended starting time.
DS3231 times UV LED array exposure for PCB or cyanotype printing. Programmable timer with LCD countdown.
What's in this kit
- Arduino Uno R3
- DS3231 RTC
- 5V Relay Module
- 16x2 LCD
- I2C Backpack
- Tactile Button x3
- UV LED 395nm x12
- BC547 Transistor x2
- 100Ω Resistors x12
- 1N4007 Diode x3
- PCB Prototype Board x2
- 9V Battery Snap
- 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