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Preciso de ajuda com uma PCB adquirida na China não consigo colocar os botões físicos do BREWUNO para funcionar

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E

Evertongold

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Nos diagramas do BrewUno, eles informam pra alimentar com os 5v e o GND. Vê se o controlador é o PCF8574 ou o PCF8574A que usou? Teria uma imagem de alta qualidade da tua placa, pra gente dar uma olhada?

Outra coisa, onde comprou essa placa? Pode passar o link?
 
Last edited:
Obrigado pela resposta, eu comprei na PCBway,. Estou usando o PCF8574AP, TINHA MONTADO COM PCF8574P
 

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Na folha de dados diz que ele trabalha na tensão de 2,5 a 6 v então conforme o esquema elétrico está dentro da especialização já que ele se encontra alimentado com 3,3 v
 
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Você não colocou o outro PCF8574. Essas placas usam um para o LCD e o outro para o Teclado. O PCF8574AP se não me engano, lá nesse projeto fala pra usar o PCF8574 sem o A. Se nãoo Display fica com erros.
 
Eu coloquei primeiro o PCFxxxxP não funcionou , agora coloquei o PCFxxxxAP e também não funcionou, deve ser o endereço que tem que alterar porém não acho a linha onde deve ser alterado
 

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