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09. Wake up
09. Wake up
This example of analog output uses a buzzer to generate the sound of the police siren, the morning alarm and a timer. The circuit can be managed from the Internet via alarm, stop, timer and snooze commands.
Figure 1 - wake up circuit
Figure 1 - wake up circuit
1. Circuit
1. Circuit
Connect the buzzer as shown in figure 1:
- positive PIN to the PIN d2
- negative PIN to the PIN GND.
The long PIN is positive.
2. Sketch
2. Sketch
Write a sketch K to define:
- the output connection: sound::d2
- the commands to control the buzzer: beep, alarm, snooze, stop and timer
sound :: d2 beep = [sound=6,sound=0 ##1] alarm = [beep #2] snooze = [beep #0,alarm ##5] stop = [sound=0] timer = [alarm ##10] or simply load the sketch with the command
] load e09_wake_up
Figure 2 - alarm clock and timer commands
Figure 2 - alarm clock and timer commands
3. Try and learn
3. Try and learn
Using the sound command we will create the sound of the police siren, the morning alarm and a timer.
Try the following commands now:
] sound=6
the buzzer emits an infinite sequence of beeps
] sound=440
the buzzer sounds the note LA
] sound=699
the buzzer sounds the note FA
] police = [sound=440 #2,sound=699 #2 ##1]] police
to create the sound of the police siren
] stop
to turn off the sound
] beep
generates a beep burst for a second
] alarm
generates the alarm clock to wake you up every morning
] snooze
to continue sleeping for another 5 seconds
] stop
to turn off the alarm
] timer
sets a 10-second timer (wait for 10 seconds to hear the alarm)
] stop
to turn off the timer.
4. Summarizing
4. Summarizing
In this lesson you learned or repeated:
- how to use a buzzer
- the commands: load, sound, #, ##
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