ESP_Midea/Midea_ESP/FINDING_SYMBOLS.md

Finding Symbols in KiCad

TXB0104PWR Symbol Location

The TXB0104PWR symbol is in your custom library: Midea_ESP

How to Add TXB0104PWR in KiCad:

1. Press A (Add Symbol) or click the "Place Symbol" tool
2. In the symbol chooser, type: Midea_ESP:TXB0104PWR
   • Or search for: TXB0104
   • Or browse libraries and look for Midea_ESP library
3. Select the symbol and click OK
4. Place it on the schematic

Full Symbol Path:

Library: Midea_ESP
Symbol Name: TXB0104PWR
Full Path: Midea_ESP:TXB0104PWR

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All Custom Symbols in Midea_ESP Library

Your custom library (libs/Midea_AC_Controller.kicad_sym) contains:

Symbol Name	Full Path	Component
ESP32-WROOM-32E	Midea_ESP:ESP32-WROOM-32E	ESP32 module
TXB0104PWR	Midea_ESP:TXB0104PWR	Level shifter
AMS1117-3.3	Midea_ESP:AMS1117-3.3	Voltage regulator
CP2102N	Midea_ESP:CP2102N	USB-to-Serial (not used)

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If the Symbol Doesn't Appear

Check 1: Library is Added to Project

1. In KiCad, go to Preferences → Manage Symbol Libraries
2. Check if Midea_ESP library is listed
3. If not, add it:
   • Click Add (or +)
   • Type: KiCad
   • Library Path: Browse to libs/Midea_AC_Controller.kicad_sym
   • Library Name: Midea_ESP

Check 2: Library File Location

The library file should be at:

/home/nearxos/Projects/ESPHome/PCB_Board/Midea_ESP/libs/Midea_AC_Controller.kicad_sym

Check 3: Symbol Name in Library

Open the library file and verify the symbol name is exactly:

(symbol "TXB0104PWR" ...

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Alternative: Search Methods in KiCad

Method 1: Direct Search

1. Press A (Add Symbol)
2. In the search box, type: TXB0104
3. KiCad will search all loaded libraries

Method 2: Browse by Library

1. Press A (Add Symbol)
2. In the library list, find Midea_ESP
3. Expand it to see all symbols
4. Select TXB0104PWR

Method 3: Filter by Library

1. Press A (Add Symbol)
2. In the filter box, type: Midea_ESP
3. This shows only symbols from that library

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Verifying Library is Loaded

In KiCad Schematic Editor:

1. Preferences → Manage Symbol Libraries
2. Look for Midea_ESP in the list
3. Check the Path column - should point to:

   /home/nearxos/Projects/ESPHome/PCB_Board/Midea_ESP/libs/Midea_AC_Controller.kicad_sym
   

If Library is Missing:

1. Click Add button
2. Choose Type: KiCad
3. Library Path: Click folder icon and browse to:

   /home/nearxos/Projects/ESPHome/PCB_Board/Midea_ESP/libs/Midea_AC_Controller.kicad_sym
   

4. Library Name: Midea_ESP (or leave blank, KiCad will use filename)
5. Click OK
6. Click OK to close preferences

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Quick Reference: All Symbols for This Project

Custom Library (Midea_ESP):

• Midea_ESP:ESP32-WROOM-32E - ESP32 module
• Midea_ESP:TXB0104PWR - Level shifter
• Midea_ESP:AMS1117-3.3 - Voltage regulator

Standard KiCad Libraries:

• Device:C - Capacitors (unpolarized)
• Device:R - Resistors
• Device:LED - LEDs
• Button_Switch_SMD:SW_PUSH - Buttons
• Connector_JST:JST_XH_B4B-XH-A - JST connector
• Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical - Programming header
• power:+3V3 - Power symbols
• power:+5V - Power symbols
• power:GND - Power symbols

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Troubleshooting

Problem: Symbol not found

Solution:

1. Verify library is added (Preferences → Manage Symbol Libraries)
2. Check file path is correct
3. Restart KiCad if needed

Problem: Library appears but symbol doesn't

Solution:

1. Check symbol name spelling (case-sensitive)
2. Verify symbol exists in library file
3. Try searching for just TXB0104 (partial match)

Problem: Can't add library

Solution:

1. Check file permissions
2. Verify file exists at the path
3. Make sure you're using KiCad 9.0.2 (your version)

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Step-by-Step: Adding TXB0104PWR

1. Open KiCad Schematic Editor
2. Press A (or click Place Symbol)
3. In the search box, type: Midea_ESP:TXB0104PWR
4. If found, click OK and place on schematic
5. If not found, go to Preferences → Manage Symbol Libraries and add the library

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Library File Structure

The library file contains all custom symbols:

libs/Midea_AC_Controller.kicad_sym
  ├── ESP32-WROOM-32E
  ├── TXB0104PWR  ← This is what you need
  ├── AMS1117-3.3
  └── CP2102N

All symbols are in one file, but KiCad treats them as separate symbols from the Midea_ESP library.