Fitness Step Counter Kit with ESP32 + Servo
Fitness Step Counter Kit with ESP32 + Servo — Elbow Assist Brace
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Rehabilitation engineers and health-tech makers — build a wearable elbow flexion assist brace that uses twin MG996R servos to support arm movement, with real-time torque sensing and automatic safety cutoffs. Designed for post-stroke or post-injury therapy, this kit brings professional-grade assistive technology to your workbench.
What You'll Build
A lightweight, 3D-printed arm brace driven by two MG996R servos with PCA9685 PWM control. Force‑sensitive resistors (FSR 402) detect elbow flexion intent, while ACS712 current sensors monitor servo torque. When torque exceeds programmed limits, the system cuts power instantly — protecting the patient. The MPU6050 IMU tracks acceleration and orientation for step counting and motion logging via the ESP32.
What You'll Learn
- PID torque control of high‑torque servos using sensor feedback loops
- Interfacing I2C devices (PCA9685, MPU6050) and ADC‑based force sensors with ESP32
- Implementing hardware and software safety torque limits for human‑machine interaction
- Designing and assembling a wearable 3D‑printed brace with velcro straps for patient comfort
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | x1 |
| MG996R Servo | x2 |
| PCA9685 Driver | x1 |
| FSR 402 | x2 |
| ACS712 5A | x2 |
| MPU6050 | x1 |
| LM2596 Buck Converter | x1 |
| 7.4V LiPo 2000mAh | x1 |
| XT60 Connector | x1 |
| 100nF Caps | x15 |
| PCB Prototype Board | x3 |
| 3D Printed Brace | x1 |
| Velcro Straps | x4 |
| Soldering Iron | x1 |
| Solder Wire | x1 |
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
B.Tech ECE and EEE students building final-year projects on assistive technology, rehabilitation engineers prototyping for health‑tech startups, and Smart India Hackathon participants in the healthcare track will find this kit invaluable. Experienced makers from VIT, BITS, IITs, or NITs working on human‑centred motor control can directly deploy the hardware and code.
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 access the AI companion trained on this exact project, or message us on WhatsApp — we'll help you debug the control logic or servo wiring step by step.
Can I use this kit for a different joint, like knee or wrist?
The 3D printed brace and force sensor layout are optimised for the elbow. With your own 3D models and sensor repositioning the control electronics can be adapted, but we recommend mastering the elbow version first.
How do I ensure the torque safety limits work correctly?
The ESP32 code provided includes pre‑set thresholds based on ACS712 current readings. You can fine‑tune the limits via the serial monitor during bench testing before wearing the brace.
Does this kit come with the 3D printed brace pre-assembled?
The 3D printed brace and velcro straps are included as parts; you will assemble and adjust them to fit the patient’s arm following the build guide. No special tools beyond the included soldering iron are required.
Fitness — 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