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Step 2Build It!
This is the important bit of the Kitchen Timer.
The easiest way to show you how to wire up this circuit is to use the annotated Fritzing Sketch above.
I will now explain the circuit, to those who care.
As you can see one side of the 10 LED Bar Graph is connected to the Gnd pin on the Arduino, while each leg on the other side is connected to a digital Arduino Pin. This means that when a Pin on the Arduino is set to HIGH, the corresponding LED Segment will light up. The Pins used to connect the Arduino are 3, 4, 5, 6, 7, 8, 10, 11, 12, and 13, as Pin 2 is reserved for the button, and PWM Pin 9 is reserved for using the piezo-electric buzzer. The switch is wired so that when it is closed the 5v connects to Pin 2 and through to the Gnd Pin. This means that when the switch is closed Pin 2 can be read as HIGH, and when the switch is open Pin 2 will be read as LOW. The Piezo Buzzer is connected to PWM Pin 9 so that we can simulate a square sine wave through it using analogWrite, which will create a beeping noise to alert the user that the timer has finished.
Thats pretty much it, but I recommend checking back here if you need to do any trouble shooting.
NB: I recommend connecting the ground of the Piezo buzzer to the same ground as that of the LED Bar Graph, so as not to have anything interfering with the resistor and switch system for adding time to the counter.
The easiest way to show you how to wire up this circuit is to use the annotated Fritzing Sketch above.
I will now explain the circuit, to those who care.
As you can see one side of the 10 LED Bar Graph is connected to the Gnd pin on the Arduino, while each leg on the other side is connected to a digital Arduino Pin. This means that when a Pin on the Arduino is set to HIGH, the corresponding LED Segment will light up. The Pins used to connect the Arduino are 3, 4, 5, 6, 7, 8, 10, 11, 12, and 13, as Pin 2 is reserved for the button, and PWM Pin 9 is reserved for using the piezo-electric buzzer. The switch is wired so that when it is closed the 5v connects to Pin 2 and through to the Gnd Pin. This means that when the switch is closed Pin 2 can be read as HIGH, and when the switch is open Pin 2 will be read as LOW. The Piezo Buzzer is connected to PWM Pin 9 so that we can simulate a square sine wave through it using analogWrite, which will create a beeping noise to alert the user that the timer has finished.
Thats pretty much it, but I recommend checking back here if you need to do any trouble shooting.
NB: I recommend connecting the ground of the Piezo buzzer to the same ground as that of the LED Bar Graph, so as not to have anything interfering with the resistor and switch system for adding time to the counter.
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