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