302 lines
14 KiB
Markdown
302 lines
14 KiB
Markdown
# WiFiX-Enhanced Wiring Diagram
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## 🔌 Complete Connection Map
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### Visual Wiring Layout
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```
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┌─────────────────────────────────────────────────────────────────────┐
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│ BREADBOARD LAYOUT │
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├─────────────────────────────────────────────────────────────────────┤
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│ Top Rail: 3.3V Power │
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│ Bottom Rail: GND │
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└─────────────────────────────────────────────────────────────────────┘
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┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐
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│ ESP32 │ │ OLED │ │ SD CARD │ │ BW16 │
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│ DevKit │ │ Display │ │ Module │ │ Module │
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└─────────────┘ └─────────────┘ └─────────────┘ └─────────────┘
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┌─────────────────────────────────────────────────────────────────────┐
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│ CONNECTION DETAILS │
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├─────────────────────────────────────────────────────────────────────┤
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│ Power Connections: │
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│ ├─ ESP32 3.3V → Top Rail (+) │
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│ ├─ ESP32 GND → Bottom Rail (-) │
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│ ├─ Top Rail → OLED VCC, SD VCC, BW16 VCC │
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│ └─ Bottom Rail → OLED GND, SD GND, BW16 GND │
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│ │
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│ Signal Connections: │
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│ ├─ ESP32 GPIO21 → OLED SDA (Blue Wire) │
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│ ├─ ESP32 GPIO22 → OLED SCL (Yellow Wire) │
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│ ├─ ESP32 GPIO23 → SD MOSI (Green Wire) │
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│ ├─ ESP32 GPIO19 → SD MISO (Orange Wire) │
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│ ├─ ESP32 GPIO18 → SD CLK (Purple Wire) │
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│ ├─ ESP32 GPIO5 → SD CS (White Wire) │
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│ ├─ ESP32 GPIO16 → BW16 TX (Gray Wire) │
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│ └─ ESP32 GPIO17 → BW16 RX (Brown Wire) │
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└─────────────────────────────────────────────────────────────────────┘
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```
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## 🎨 Color-Coded Wiring Scheme
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### Wire Color Standards
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```
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🔴 Red: Power (3.3V)
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⚫ Black: Ground (GND)
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🔵 Blue: I2C SDA
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🟡 Yellow: I2C SCL
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🟢 Green: SPI MOSI
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🟠 Orange: SPI MISO
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🟣 Purple: SPI CLK
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⚪ White: SPI CS
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🔘 Gray: UART TX
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🟤 Brown: UART RX
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```
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### Physical Wiring Map
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```
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ESP32 DevKit (30-pin) Layout:
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┌─────────────────────────────────────────────────────────────────────┐
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│ 3.3V [●]──────────────────────────────┐ │
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│ GND [●]──────────────────────────────┼──┐ │
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│ [ ] [ ] D23 (MOSI) ────────┐ │ │ │
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│ [ ] [ ] D22 (SCL) ─────────┼──┐ │ │ │
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│ [ ] [ ] D21 (SDA) ─────────┼──┼──┤ │ │
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│ [ ] [ ] D19 (MISO) ────────┼──┤ │ │ │
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│ [ ] [ ] D18 (CLK) ─────────┼──┼──┤ │ │
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│ [ ] [ ] D5 (CS) ───────────┼──┼──┼──┤ │
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│ [ ] [ ] D17 (TX) ──────────┼──┼──┼──┼──┐ │
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│ [ ] [ ] D16 (RX) ──────────┼──┼──┼──┼──┼──┐ │
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│ GND [●]──────────────────────────┼──┼──┼──┼──┼──┐ │
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│ [ ] [●] D2 (LED) │ │ │ │ │ │ │
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│ [ ] [ ] │ │ │ │ │ │ │
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│ [ ] [ ] │ │ │ │ │ │ │
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│ [ ] [ ] │ │ │ │ │ │ │
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│ 3.3V [●]──────────────────────────┼──┼──┼──┼──┼──┘ │
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│ EN [●] │ │ │ │ │ │
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└──────────────────────────────────────┼──┼──┼──┼──┘ │
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│ │ │ │ │
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▼ ▼ ▼ ▼ ▼
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OLED Connections: SD Card: BW16:
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┌─────────────┐ ┌─────────────┐ ┌─────────────┐
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│ VCC [●]─────┼─── Red Wire │ VCC [●]─────┼─── Red │ VCC [●]─────┼─── Red
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to 3.3V Rail │ │ to 3.3V Rail│ │ to 3.3V Rail│
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│ GND [●]─────┼─── Black Wire │ GND [●]─────┼─── Black │ GND [●]─────┼─── Black
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to GND Rail │ │ to GND Rail │ │ to GND Rail │
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│ SDA [●]─────┼─── Blue Wire │ MOSI[●]─────┼─── Green │ TX [●]─────┼─── Gray
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to GPIO21 │ │ to GPIO23 │ │ to GPIO16 │
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│ SCL [●]─────┼─── Yellow Wire │ MISO[●]─────┼─── Orange │ RX [●]─────┼─── Brown
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to GPIO22 │ │ to GPIO19 │ │ to GPIO17 │
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└─────────────┘ │ CLK [●]─────┼─── Purple └─────────────┘
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│ to GPIO18 │
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│ CS [●]─────┼─── White
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│ to GPIO5 │
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└─────────────┘
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```
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## 🔧 Breadboard Layout
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### Recommended Breadboard Sections
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```
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Full-Size Breadboard (830 tie-points):
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┌─────────────────────────────────────────────────────────────────────┐
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│ A1-A30: ESP32 DevKit │
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│ B1-B30: Power distribution │
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│ C1-C30: OLED Display connections │
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│ D1-D30: SD Card connections │
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│ E1-E30: BW16 connections │
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│ F1-F30: Spare/Expansion │
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│ G1-G30: Spare/Expansion │
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│ H1-H30: Spare/Expansion │
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│ I1-I30: Spare/Expansion │
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│ J1-J30: Spare/Expansion │
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└─────────────────────────────────────────────────────────────────────┘
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Specific Layout:
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┌─────────────────────────────────────────────────────────────────────┐
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│ Row 1-5: Power rails (3.3V top, GND bottom) │
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│ Row 6-10: ESP32 main placement │
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│ Row 11-15: OLED display area │
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│ Row 16-20: SD card module area │
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│ Row 21-25: BW16 module area │
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│ Row 26-30: Status LEDs/Expansion │
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└─────────────────────────────────────────────────────────────────────┘
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```
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## 📏 Wire Length Guidelines
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### Maximum Recommended Lengths
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```
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I2C Connections (OLED):
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├─ SDA: ≤30cm (12 inches)
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├─ SCL: ≤30cm (12 inches)
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└─ Use twisted pairs for longer runs
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SPI Connections (SD Card):
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├─ MOSI: ≤15cm (6 inches)
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├─ MISO: ≤15cm (6 inches)
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├─ CLK: ≤15cm (6 inches)
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├─ CS: ≤15cm (6 inches)
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└─ Keep all SPI wires same length
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UART Connections (BW16):
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├─ TX: ≤50cm (20 inches)
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├─ RX: ≤50cm (20 inches)
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└─ Use shielded cable for long runs
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Power Connections:
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├─ 3.3V: ≤10cm (4 inches) recommended
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├─ GND: As short as possible
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└─ Use thicker wire for power (22-24 AWG)
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```
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## ⚡ Power Distribution
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### Current Requirements by Module
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```
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ESP32 DevKit:
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├─ Normal operation: 80-120mA
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├─ WiFi active: 160-260mA
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└─ Peak current: 500mA
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BW16 Module:
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├─ Normal operation: 60-100mA
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├─ WiFi active: 120-200mA
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└─ Peak current: 300mA
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OLED Display:
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├─ Normal operation: 15-25mA
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└─ All pixels on: 40mA
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SD Card Module:
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├─ Idle: 5-10mA
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├─ Active: 50-100mA
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└─ Peak current: 150mA
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Total System:
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├─ Average current: 200-300mA
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├─ Peak current: 800-1000mA
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└─ Recommended supply: 3.3V @ 1.5A
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```
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## 🔍 Testing Connections
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### Visual Inspection Checklist
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```
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✓ All power connections correct (3.3V, not 5V)
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✓ Common ground established between all modules
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✓ Signal wire colors match standard
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✓ No loose connections or stray wire strands
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✓ No short circuits between adjacent pins
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✓ Wire insulation not damaged
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✓ Breadboard connections firm
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```
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### Continuity Testing
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```
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Use multimeter continuity mode:
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1. ESP32 3.3V → each module VCC
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2. ESP32 GND → each module GND
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3. ESP32 GPIO21 → OLED SDA
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4. ESP32 GPIO22 → OLED SCL
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5. ESP32 GPIO23 → SD MOSI
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6. ESP32 GPIO19 → SD MISO
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7. ESP32 GPIO18 → SD CLK
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8. ESP32 GPIO5 → SD CS
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9. ESP32 GPIO16 → BW16 TX
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10. ESP32 GPIO17 → BW16 RX
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```
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### Power-On Test Sequence
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```
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Step 1: Power supply test
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├─ Connect USB to ESP32
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├─ Measure 3.3V rail: 3.2-3.4V expected
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├─ Measure total current: <100mA expected
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└─ Check for hot components
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Step 2: Module detection
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├─ Upload test sketch
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├─ Check serial output
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├─ Verify OLED display
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├─ Test SD card detection
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└─ Confirm BW16 communication
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Step 3: Full system test
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├─ Upload main firmware
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├─ Check WiFi network appears
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├─ Test captive portal
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├─ Verify credential storage
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└─ Confirm all features working
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```
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## 🚨 Common Wiring Mistakes
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### Power Related
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```
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❌ Using 5V instead of 3.3V → WILL DAMAGE MODULES
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❌ Insufficient power supply → Unstable operation
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❌ Missing common ground → Communication failures
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❌ Long power wires → Voltage drop issues
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```
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### Signal Related
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❌ Swapped TX/RX connections → No communication
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❌ I2C pull-up resistors missing → Unreliable operation
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❌ SPI wires too long → Data corruption
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❌ Crossed signal wires → Interference
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```
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### Mechanical
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```
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❌ Loose breadboard connections → Intermittent faults
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❌ Wire strands touching → Short circuits
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❌ Insufficient wire gauge → Voltage drop
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❌ Poor strain relief → Broken connections
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```
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## 🔧 Troubleshooting Wiring Issues
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### System Won't Power On
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```
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1. Check power supply voltage (3.3V ±5%)
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2. Verify polarity (no reversed connections)
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3. Test for short circuits (multimeter)
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4. Check current draw (should be <100mA idle)
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5. Inspect for damaged components
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```
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### OLED Display Not Working
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```
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1. Verify I2C connections (SDA/SCL not swapped)
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2. Check I2C address (usually 0x3C)
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3. Test with I2C scanner sketch
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4. Add pull-up resistors (4.7kΩ) if needed
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5. Check power supply stability
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```
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### SD Card Not Detected
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```
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1. Verify all SPI connections
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2. Check CS pin configuration
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3. Test with different SD card
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4. Format card as FAT32
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5. Check SPI speed (try slower)
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```
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### BW16 Not Communicating
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```
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1. Verify TX/RX connections (crossover)
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2. Check baud rate (115200)
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3. Test with serial loopback
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4. Verify BW16 firmware loaded
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5. Check antenna connection
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```
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---
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**Remember**: Measure twice, cut once. Double-check all connections before powering on! |