138 lines
4.3 KiB
Markdown
138 lines
4.3 KiB
Markdown
# 🎯 WiFiX-Enhanced Pin Reference Card
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## Quick Reference Guide
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### ESP32 Pin Map
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```
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┌─────────────────────────────────────────────────────────────────────┐
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│ ESP32 DevKit V1 Pinout (30-pin) │
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├─────────────────────────────────────────────────────────────────────┤
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│ 3.3V [●] Power Out → All Modules │
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│ GND [●] Ground → All Modules │
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│ │
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│ I2C (OLED Display): │
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│ GPIO21 [●] → OLED SDA (Blue Wire) │
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│ GPIO22 [●] → OLED SCL (Yellow Wire) │
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│ │
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│ SPI (SD Card): │
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│ GPIO23 [●] → SD MOSI (Green Wire) │
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│ GPIO19 [●] → SD MISO (Orange Wire) │
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│ GPIO18 [●] → SD CLK (Purple Wire) │
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│ GPIO5 [●] → SD CS (White Wire) │
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│ │
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│ UART (BW16 Module): │
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│ GPIO16 [●] → BW16 TX (Gray Wire) │
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│ GPIO17 [●] → BW16 RX (Brown Wire) │
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│ │
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│ Status LED (Optional): │
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│ GPIO2 [●] → LED + (330Ω resistor) │
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│ GND [●] → LED - │
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└─────────────────────────────────────────────────────────────────────┘
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```
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### Wire Color Code
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```
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🔴 RED : 3.3V Power
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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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### Module Connections
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#### OLED Display (I2C)
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```
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OLED Pin → ESP32 Pin → Wire Color
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VCC → 3.3V → 🔴 Red
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GND → GND → ⚫ Black
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SDA → GPIO21 → 🔵 Blue
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SCL → GPIO22 → 🟡 Yellow
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```
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#### SD Card Module (SPI)
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```
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SD Pin → ESP32 Pin → Wire Color
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VCC → 3.3V → 🔴 Red
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GND → GND → ⚫ Black
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MOSI → GPIO23 → 🟢 Green
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MISO → GPIO19 → 🟠 Orange
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CLK → GPIO18 → 🟣 Purple
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CS → GPIO5 → ⚪ White
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```
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#### BW16 Module (UART)
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```
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BW16 Pin → ESP32 Pin → Wire Color
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VCC → 3.3V → 🔴 Red
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GND → GND → ⚫ Black
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TX → GPIO16 → 🔘 Gray
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RX → GPIO17 → 🟤 Brown
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```
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### Quick Tests
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#### Power Test
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```
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1. Connect USB to ESP32
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2. Measure 3.3V rail: 3.2-3.4V ✓
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3. Current draw: <100mA idle ✓
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```
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#### Communication Test
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```
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I2C: i2c_scanner → Address 0x3C ✓
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SPI: sd_test → Card detected ✓
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UART: serial_test → BW16 responds ✓
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```
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### Emergency Commands
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#### Serial Monitor
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```
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ESP32: pio device monitor -b 115200
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BW16: pio device monitor -b 115200 -p COM?
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```
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#### Reset Commands
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```
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ESP32: EN button (GPIO0 to GND)
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BW16: Reset button or power cycle
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```
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### Troubleshooting Quick Fix
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#### No OLED Display
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```
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1. Check I2C address: 0x3C
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2. Add pull-ups: 4.7kΩ on SDA/SCL
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3. Swap SDA/SCL if reversed
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```
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#### SD Card Error
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```
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1. Check CS pin: GPIO5
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2. Format card: FAT32
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3. Try different card
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```
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#### BW16 No Response
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```
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1. Swap TX/RX if reversed
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2. Check baud: 115200
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3. Verify firmware loaded
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```
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### GPIO Usage Summary
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```
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Used GPIOs: 16, 17, 18, 19, 21, 22, 23, 5
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Available: All others (2, 4, 12, 13, 14, 15, 25, 26, 27, 32, 33)
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```
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---
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**Keep this card handy while building!** 🛠️ |