Cognitive Load EEG Headband Variant 9 Kit with ESP32 + LED
Cognitive Load EEG Headband Kit (ESP32 + LED) – Monitor Mental Workload Shifts in Real-Time
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Whether you are researching cognitive load during pilot training, quantifying meditation depth, or engineering a focus-aware BCI, this single-channel EEG headband gives you a complete platform. It amplifies microvolt-level brain signals through a precision LM324 front-end and an ADS1115 16-bit ADC, then computes the alpha-to-beta power ratio on the ESP32. The OLED displays live mental workload index, and every reading gets time-stamped to microSD for offline analysis. No guesswork—just a validated, solder-it-yourself design backed by an AI build companion that knows every component in your kit.
What You'll Build
You’ll assemble a comfortable headband that captures EEG from a frontal electrode site, amplifies the signal, and extracts the alpha/beta ratio—a reliable proxy for mental effort. The finished device shows the ratio live on the OLED and logs sessions to microSD along with RTC timestamps. Powered by a rechargeable LiPo, it runs for hours and connects via the headband’s gel snaps, giving you clean signals without complicated electrode paste.
What You'll Learn
- Design a high-gain, low-noise bio-amplifier stage with LM324 op-amps for clean EEG acquisition
- Configure the ADS1115 for 16-bit differential sampling and stream data via I²C to the ESP32
- Implement real-time digital band-pass filters to isolate alpha (8–12 Hz) and beta (13–30 Hz) rhythms
- Log timestamped metrics with a DS3231 RTC and microSD for offline analysis in Python or MATLAB
- Integrate a 0.96-inch OLED to display alpha/beta ratio, battery status, and system feedback
- Prototype the circuit on PCB boards, solder the complete headband, and route a wearable form factor
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| ADS1115 16-bit ADC | 1 |
| LM324 Op-Amp | 2 |
| Electrode Gel Snap | 3 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 100kΩ Resistors | 10 |
| 10kΩ Resistors | 10 |
| 100nF Caps | 15 |
| 3.7V LiPo 1000mAh | 1 |
| TP4056 Module | 1 |
| PCB Prototype Board | 3 |
| EEG Headband | 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 advanced kit suits B.Tech and M.Tech students in ECE or biomedical engineering building final-year neurofeedback projects, research scholars at IITs and NITs prototyping low-cost EEG acquisition, and professionals developing wearable BCI solutions for hackathons like Smart India Hackathon. ATL Tinkering Lab mentors running advanced student cohorts will also find it a ready-made platform for teaching bio-signal processing.
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 on the box to start a session with the AI companion that understands your exact circuit and code. For personalised help, simply message us on WhatsApp—our engineers often reply within hours.
Is this kit safe for measuring human EEG?
Absolutely. The headband uses passive gel snap electrodes and the analog front-end is isolated from mains. All voltages stay under 3.7 V, and the LiPo battery powers the entire system. As with any bio-signal project, always disconnect the USB when wearing the headband.
Can I extend the design to multiple EEG channels?
The included ADS1115 supports four single‑ended or two differential channels, so you can add one more electrode pair by replicating the op‑amp stage and modifying the firmware. Schematics and guidance for a second channel are included in the AI documentation.
How do I interpret the alpha/beta ratio for cognitive load?
A rising ratio (more alpha, less beta) generally indicates relaxation or low workload. A falling ratio signals increased mental effort. The kit’s OLED shows the instantaneous ratio; logged data helps you correlate trends with tasks like memorization, problem‑solving, or meditation.
Single-channel ADS1115-amplified EEG detects alpha/beta ratio shifts indicating mental workload changes.
What's in this kit
- ESP32 Dev Board
- ADS1115 16-bit ADC
- LM324 Op-Amp x2
- Electrode Gel Snap x3
- DS3231 RTC
- MicroSD Module
- 0.96in OLED
- 100kΩ Resistors x10
- 10kΩ Resistors x10
- 100nF Caps x15
- 3.7V LiPo 1000mAh
- TP4056 Module
- PCB Prototype Board x3
- EEG Headband
- 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.
Other projects you can build
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