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Using Knowledge Base Tool.

Aqui vão algumas recomendações para resolver o seu problema com o MCP23017 e o ESP32 rodando ESPHome:

Veja se você está usando pinos I²C livres e não “boot-strap” do módulo:
- Evite usar GPIO0, GPIO2, GPIO12, GPIO15 etc., pois esses pinos têm funções internas de seleção de boot.
- Use, por exemplo, SDA = GPIO21 e SCL = GPIO22 no ESP32-WROOM-32E.
  (baseado em guidance da knowledge base: evite boot-strapped pins quando possível)
Garanta pull-ups e desacoplamento adequados:
- Coloque dois 4.7k Resistor (um em SDA, outro em SCL) na tensão de 3.3 V.
- Acrescente também um 0.1 µF Capacitor próximo ao pino EN do ESP32 para melhorar imunidade a ruídos.
  (conforme recomendação da knowledge base: pull-ups de 4.7 kΩ e C_EN = 0.1 µF)
No YAML do ESPHome, defina o barramento e insira um delay antes de iniciar o MCP23017:

Yaml
i2c:
  sda: GPIO21
  scl: GPIO22
  scan: True    # opcional, ajuda no debug

# opcional: para dar tempo de estabilização
on_boot:
  then:
    - delay: 2s

mcp23017:
  - id: expander
    address: 0x20    # ajuste conforme o A0/A1/A2
    # seus pinos e configurações…

Verifique o hardware do MCP23017:
- VDD em 3.3 V, VSS em GND.
- RESET puxado para 3.3 V (por resistor interno ou externo).
- Endereço I²C configurado corretamente via A0/A1/A2.
Teste o scan do I²C separadamente:
1. Programe ESPHome apenas com o bloco i2c: e scan: True.
2. Abra o console e valide se o 0x20 aparece na lista de dispositivos encontrados.
3. Só então adicione o componente MCP23017-E/SP.

Com esses ajustes de pinos, pull-ups, desacoplamento e delay, o ESPHome deve conseguir detectar o expander no barramento I²C.

Selecionar pull-ups

Selecionar capacitor EN

Configurar net class

Criar pontos de teste

Selecionar footprint MCP23017

249 days

Ready.

Reviews

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