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Return to BlogDaily Timer with Binary Display by PIC16F630
Posted Feb 03, 2012 at 1:36 pm
Figure 1
The circuit is featuring a binary display on a daily timer since the evolution of binary clocks, which have been used for planning time ON and time OFF using a relay.
The relay used is operating in a bistable mode to maintain a low consumption since only the change of its status will the relay require power. The setting of the current time, tome ON, and time OFF is made through the two buttons. The single coil bistable relay is being driven by RS485 driver which can provide a current output of 60 mA. The RS485 is functioning like a half bridge driver since the consumption of the relay is 40 mA and the operation is properly functioning. This kind of driver is absorbing 2.5 mA even when the LEDs are OFF so the consumption should not be neglected. Placing a transistor with almost zero consumption can solve this issue.
Pressing either button for a short time can either show the time ON or time OFF and the actual time when both buttons are pressed. A duration of 5 seconds pressing will start the operation of time setting of the corresponding procedure.
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