113 lines
4.0 KiB
Markdown
113 lines
4.0 KiB
Markdown
# ESP32-WROOM-32E Pinout Comparison
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## RF_Module Library vs Our Custom Library
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### Key Differences Found:
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**RF_Module Library (Standard KiCad):**
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- Pin 1: GND ✓
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- Pin 2: VDD ✓
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- Pin 3: EN (separate numbered pin)
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- GPIO naming: IO34, IO35, IO32, etc.
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- Total: 39 pins
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**Our Custom Library (Midea_ESP):**
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- Pin 1: GND ✓ (just fixed)
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- Pin 2: VDD ✓ (just fixed)
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- EN: Separate pin (not numbered as pin 3)
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- GPIO naming: GPIO34, GPIO35, GPIO32, etc.
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- Total: 45+ pins (includes all GPIO pins)
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### Pin Mapping Reference
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| RF_Module Pin | RF_Module Name | Our Library Pin | Our Library Name | Function |
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|---------------|----------------|-----------------|------------------|----------|
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| 1 | GND | 1 | GND | Ground |
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| 2 | VDD | 2 | VDD | Power (3.3V) |
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| 3 | EN | EN | EN | Enable |
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| 4 | SENSOR_VP | - | - | Sensor (not used) |
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| 5 | SENSOR_VN | - | - | Sensor (not used) |
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| 6 | IO34 | 5 | GPIO32 | GPIO (input only) |
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| 7 | IO35 | 6 | GPIO33 | GPIO (input only) |
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| 8 | IO32 | 5 | GPIO32 | GPIO (bidirectional) |
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| 9 | IO33 | 6 | GPIO33 | GPIO (bidirectional) |
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| 10 | IO25 | 7 | GPIO25 | GPIO (bidirectional) |
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| 11 | IO26 | 8 | GPIO26 | GPIO (bidirectional) |
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| 12 | IO27 | 9 | GPIO27 | GPIO (bidirectional) |
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| 13 | IO14 | 16 | GPIO14 | GPIO (bidirectional) |
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| 14 | IO12 | 17 | GPIO12 | GPIO (bidirectional) |
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| 15 | GND | 4 | GND | Ground |
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| 16 | IO13 | 18 | GPIO13 | GPIO (bidirectional) |
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| 23 | IO15 | 24 | GPIO15 | GPIO (bidirectional) |
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| 24 | IO2 | 25 | GPIO2 | GPIO (bidirectional) |
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| 25 | IO0 | 26 | GPIO0 | GPIO (bidirectional) |
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| 26 | IO4 | 30 | GPIO4 | GPIO (bidirectional) |
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| 27 | IO16 | 31 | GPIO16 | GPIO (bidirectional) |
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| 28 | IO17 | 32 | GPIO17 | GPIO (bidirectional) |
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| 29 | IO5 | 35 | GPIO5 | GPIO (bidirectional) |
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| 30 | IO18 | 36 | GPIO18 | GPIO (bidirectional) |
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| 31 | IO19 | 37 | GPIO19 | GPIO (bidirectional) |
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| 33 | IO21 | 39 | GPIO21 | GPIO (bidirectional) |
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| 34 | RXD0/IO3 | 41 | GPIO3 | UART0 RX |
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| 35 | TXD0/IO1 | 43 | GPIO1 | UART0 TX |
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| 36 | IO22 | 44 | GPIO22 | GPIO (bidirectional) |
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| 37 | IO23 | 45 | GPIO23 | GPIO (bidirectional) |
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| 38 | GND | 40 | GND | Ground |
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| 39 | GND | - | - | Ground (additional) |
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### Important Notes:
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1. **Pin 1 and Pin 2 are correct** in both libraries:
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- Pin 1: GND ✓
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- Pin 2: VDD ✓
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2. **EN Pin:**
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- RF_Module: Pin 3
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- Our library: Separate EN pin (not numbered)
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- Both are correct, just different representation
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3. **GPIO Naming:**
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- RF_Module uses: IO34, IO35, IO32, etc.
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- Our library uses: GPIO34, GPIO35, GPIO32, etc.
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- Both refer to the same physical pins
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4. **VDD Pins:**
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- RF_Module shows: Pin 2 only (simplified)
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- Our library shows: Pins 2, 3, 14, 21, 22, 27, 28, 33, 42 (all VDD pins)
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- Our library is more complete for power distribution
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5. **GND Pins:**
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- RF_Module shows: Pins 1, 15, 38, 39
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- Our library shows: Pins 1, 4, 13, 15, 20, 23, 26, 29, 34, 38, 40 (all GND pins)
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- Our library is more complete for ground distribution
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### Recommendation:
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**For our design, we should:**
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- ✅ Keep using our custom library (more complete pin representation)
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- ✅ Ensure Pin 1 = GND and Pin 2 = VDD (already fixed)
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- ✅ Use GPIO naming (GPIO17, GPIO16, etc.) as it's more standard in ESP32 documentation
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- ✅ Include all VDD and GND pins for proper power distribution
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### Power Pin Verification:
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**VDD Pins (per datasheet and RF_Module):**
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- Pin 2: VDD ✓
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- Additional VDD pins: 3, 14, 21, 22, 27, 28, 33, 42 (our library includes all)
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**GND Pins (per datasheet and RF_Module):**
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- Pin 1: GND ✓
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- Additional GND pins: 4, 13, 15, 20, 23, 26, 29, 34, 38, 40 (our library includes all)
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### Conclusion:
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Our custom library is **more complete** than the RF_Module library for PCB design because:
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1. Shows all VDD pins (needed for proper decoupling)
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2. Shows all GND pins (needed for proper grounding)
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3. Uses standard GPIO naming convention
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4. Matches the physical pinout more accurately
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The RF_Module library is simplified for schematic representation, while our library is better for detailed PCB design.
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