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JELOPA08/10/2016
Módulo de reloj con bus I2C perfecto para montajes con Arduino. Lo más complicado es ponerlo en hora, pero se puede hacer siguiendo estos pasos:
• Abrir Excel y programar estas fórmulas:
[B6]=AHORA() [B7]= (B6 - 25569) * 86400
• El resultado de la derecha es la hora UNIX que usa el programa “TimeRTCSet.pde” (Ejemplos de la librería Time.h)
• Cargar el programa TimeRTCSet.pde y abrir el terminal serie
• Compilar y lanzar el programa TimeRTCSet.pde.
• El programa se para esperando la hora desde el terminal serie, escribir T
• Ir a Excel y pulsar F9, copiar el contenido de la celda de la derecha y pegarlo en la línea superior del terminal de Arduino. Añadir unos cuantos segundos para compensar la diferencia de hora desde que se pulsó F9 y hasta que se cargue el programa en el Arduino.
• Pulsar Enviar en terminal serie.
• Comprobar que la hora mostrada por el Arduino en el terminal serie se corresponde aproximadamente con la hora actual.
Además la batería que trae es recargable y se carga cuando el reloj está alimentado externamente, por lo que no hay que preocuparse de cambiarla cada año.
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