ESP32 Servo Brace Kit - Torque-Sensing Elbow Flexion Aid
Build a Torque-Sensing Elbow Rehabilitation Brace with ESP32 Servo Control
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Create a powered orthosis that gently assists elbow flexion for patients undergoing rehabilitation. Two MG996R servos deliver controlled motion while dual FSR force sensors and ACS712 current sensors continuously measure applied torque. The ESP32 enforces safety limits - automatically stopping assist if forces exceed preset thresholds - so patients exercise without risk of injury.
What You'll Build
A wearable brace with twin servos driving elbow movement. The MPU6050 tracks arm angle, FSRs monitor grip and forearm pressure, and the ACS712 modules calculate servo torque in real time. A single ESP32 processes sensor data, speaks to the PCA9685 servo driver, and logs performance. Power comes from a rechargeable 7.4V LiPo pack regulated through an LM2596 converter. The result is a biomechatronic system ready for clinical demonstrations or further research.
What You'll Learn
- PID-based torque control of high-torque MG996R servos via I2C and PCA9685
- Interfacing FSR 402 force sensors and ACS712 current modules with an ESP32 ADC
- Implementing adaptive safety thresholds that cut servo power when torque limits are breached
- Mechanical integration of 3D-printed orthotic components with sensorised velcro straps
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| MG996R Servo | 2 |
| PCA9685 Driver | 1 |
| FSR 402 | 2 |
| ACS712 5A | 2 |
| MPU6050 | 1 |
| LM2596 Buck Converter | 1 |
| 7.4V LiPo 2000mAh | 1 |
| XT60 Connector | 1 |
| 100nF Caps | 15 |
| PCB Prototype Board | 3 |
| 3D Printed Brace | 1 |
| Velcro Straps | 4 |
| 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
Advanced hobbyists and engineering students working on rehabilitation robotics, B.Tech/B.E. final-year projects in biomedical or mechatronics, Smart India Hackathon health-tech teams, and researchers at IITs, NITs, VIT, or BITS prototyping assistive devices. Also ideal for physiotherapy clinics exploring affordable active-assist orthotics.
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 to start the AI companion, which walks you through wiring, code upload, and calibration. If you still need help, WhatsApp us and a human engineer will step in within hours.
Can the torque safety threshold be adjusted for different patients?
Yes, the ESP32 firmware lets you define maximum force limits via the FSR and ACS712 sensor thresholds. Recalibrate the device easily to match individual comfort and therapy requirements.
Is the 3D-printed brace one-size-fits-all?
It fits an average adult arm; however, the STL files are provided, so you can scale the design and print a custom-sized brace for the patient.
Does the kit require external tools beyond what is included?
You'll need a multimeter for testing, a basic screwdriver set, and a LiPo balance charger (not included). All soldering essentials are inside the box.
Seismology - Two MG996R servos with torque sensing assist elbow flexion in patients. Safety torque limits enforced.
What's in this kit
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