ESP_Midea/Midea_ESP/PINOUT_COMPARISON.md

ESP32-WROOM-32E Pinout Comparison

RF_Module Library vs Our Custom Library

Key Differences Found:

RF_Module Library (Standard KiCad):

• Pin 1: GND ✓
• Pin 2: VDD ✓
• Pin 3: EN (separate numbered pin)
• GPIO naming: IO34, IO35, IO32, etc.
• Total: 39 pins

Our Custom Library (Midea_ESP):

• Pin 1: GND ✓ (just fixed)
• Pin 2: VDD ✓ (just fixed)
• EN: Separate pin (not numbered as pin 3)
• GPIO naming: GPIO34, GPIO35, GPIO32, etc.
• Total: 45+ pins (includes all GPIO pins)

Pin Mapping Reference

RF_Module Pin	RF_Module Name	Our Library Pin	Our Library Name	Function
1	GND	1	GND	Ground
2	VDD	2	VDD	Power (3.3V)
3	EN	EN	EN	Enable
4	SENSOR_VP	-	-	Sensor (not used)
5	SENSOR_VN	-	-	Sensor (not used)
6	IO34	5	GPIO32	GPIO (input only)
7	IO35	6	GPIO33	GPIO (input only)
8	IO32	5	GPIO32	GPIO (bidirectional)
9	IO33	6	GPIO33	GPIO (bidirectional)
10	IO25	7	GPIO25	GPIO (bidirectional)
11	IO26	8	GPIO26	GPIO (bidirectional)
12	IO27	9	GPIO27	GPIO (bidirectional)
13	IO14	16	GPIO14	GPIO (bidirectional)
14	IO12	17	GPIO12	GPIO (bidirectional)
15	GND	4	GND	Ground
16	IO13	18	GPIO13	GPIO (bidirectional)
23	IO15	24	GPIO15	GPIO (bidirectional)
24	IO2	25	GPIO2	GPIO (bidirectional)
25	IO0	26	GPIO0	GPIO (bidirectional)
26	IO4	30	GPIO4	GPIO (bidirectional)
27	IO16	31	GPIO16	GPIO (bidirectional)
28	IO17	32	GPIO17	GPIO (bidirectional)
29	IO5	35	GPIO5	GPIO (bidirectional)
30	IO18	36	GPIO18	GPIO (bidirectional)
31	IO19	37	GPIO19	GPIO (bidirectional)
33	IO21	39	GPIO21	GPIO (bidirectional)
34	RXD0/IO3	41	GPIO3	UART0 RX
35	TXD0/IO1	43	GPIO1	UART0 TX
36	IO22	44	GPIO22	GPIO (bidirectional)
37	IO23	45	GPIO23	GPIO (bidirectional)
38	GND	40	GND	Ground
39	GND	-	-	Ground (additional)

Important Notes:

1. Pin 1 and Pin 2 are correct in both libraries:

   • Pin 1: GND ✓
   • Pin 2: VDD ✓

2. EN Pin:

   • RF_Module: Pin 3
   • Our library: Separate EN pin (not numbered)
   • Both are correct, just different representation

3. GPIO Naming:

   • RF_Module uses: IO34, IO35, IO32, etc.
   • Our library uses: GPIO34, GPIO35, GPIO32, etc.
   • Both refer to the same physical pins

4. VDD Pins:

   • RF_Module shows: Pin 2 only (simplified)
   • Our library shows: Pins 2, 3, 14, 21, 22, 27, 28, 33, 42 (all VDD pins)
   • Our library is more complete for power distribution

5. GND Pins:

   • RF_Module shows: Pins 1, 15, 38, 39
   • Our library shows: Pins 1, 4, 13, 15, 20, 23, 26, 29, 34, 38, 40 (all GND pins)
   • Our library is more complete for ground distribution

Recommendation:

For our design, we should:

• ✅ Keep using our custom library (more complete pin representation)
• ✅ Ensure Pin 1 = GND and Pin 2 = VDD (already fixed)
• ✅ Use GPIO naming (GPIO17, GPIO16, etc.) as it's more standard in ESP32 documentation
• ✅ Include all VDD and GND pins for proper power distribution

Power Pin Verification:

VDD Pins (per datasheet and RF_Module):

• Pin 2: VDD ✓
• Additional VDD pins: 3, 14, 21, 22, 27, 28, 33, 42 (our library includes all)

GND Pins (per datasheet and RF_Module):

• Pin 1: GND ✓
• Additional GND pins: 4, 13, 15, 20, 23, 26, 29, 34, 38, 40 (our library includes all)

Conclusion:

Our custom library is more complete than the RF_Module library for PCB design because:

1. Shows all VDD pins (needed for proper decoupling)
2. Shows all GND pins (needed for proper grounding)
3. Uses standard GPIO naming convention
4. Matches the physical pinout more accurately

The RF_Module library is simplified for schematic representation, while our library is better for detailed PCB design.