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# Samson eFit Module Internal README (MVP Implementation)
# ⚙️ Samson eFit Module Internal README (MVP Implementation)
## Purpose
## 🎯 Purpose
Build a compact, motor-controlled resistance unit with basic wireless control and encoder-based feedback.
Stay within MVP scope and avoid feature creep until core functionality works.
---
## MVP Core Goals
## 🧭 MVP Core Goals
- Smooth electronic resistance using BLDC + driver
- Wireless control of load (ESP32 → PWM)
- Encoder-based feedback to maintain commanded resistance
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---
## Current Components (Received)
## 📦 Current Components (Received)
| # | Component | Purpose | Notes |
|---|-----------|---------|------|
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---
## High-Level Architecture (MVP)
## 🧩 High-Level Architecture (MVP)
- **ESP32**: PWM output + encoder reading + wireless interface
- **BLDC Driver**: Drives motor phases based on PWM
- **AS5600 Encoder**: Shaft position/velocity feedback over I²C
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---
## Implementation Order (Milestones)
## 🛠️ Implementation Order (Milestones)
1) Bench-test BLDC controller + motor (no load)
2) Read encoder position/velocity reliably
3) Close feedback loop (PWM adjusted from encoder)
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---
## Firmware Tasks (ESP32)
## 💻 Firmware Tasks (ESP32)
- PWM generation + tuning
- Encoder I²C driver (AS5600)
- Resistance control loop (angle/speed → PWM adjust)
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---
## Hardware Tasks
## 🔩 Hardware Tasks
- Encoder magnet mounting on pulley/shaft
- Secure motor + driver on bench fixture
- Power routing + regulation
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---
## Power Notes
## 🔋 Power Notes
- M18 battery: 18V nominal
- Driver acceptable: 660V
- ESP32 requires regulated 5V/3.3V
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---
## Scope Limiters (Avoid Feature Creep)
## 🚫 Scope Limiters (Avoid Feature Creep)
Not MVP:
- Full AI workout planning
- Cloud accounts or server database
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---
## Testing Targets
## 🧪 Testing Targets
- Commanded resistance holds within stable margin
- Encoder data noise acceptable
- No uncontrolled torque spikes
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---
## Notes to Ourselves
## 📝 Notes to Ourselves
If it does not directly help us **control and stabilize resistance**, it waits until after MVP.