The next step along the path was to include the alarm clock functionality in addition to standard music controls making this a bedside gadget.
Making an alarm clock in python is fairly straightforward so I wanted to focus instead on the controls. The alarm goes off daily according to the time you set in the python script.
When that timestamp is hit the current song will play, the LCD will turn on displaying the current date/time, and the LED will go to full brightness.
To turn off the alarm you have two choices; snooze or off
Sticking with the idea of a 100% touch-less interface and wanting to leverage the controls that are already built in for music control I settled on the following for now:
Snooze = Waving your hand over 10cm above the device pauses the playback for 7 minutes and leaves the LCD with date/time on. The motion is similar to quickly swiping the air above the clock
Alarm Off = Bringing your hand down to 0cm on the device turns off the playback, turns off the LCD backlight and LED, and resets the alarm for the next day. The motion is similar to bringing your hand down onto the device (like hitting off button on your alarm clock)
I'm merging this capability in the existing code but I'm leaving the lightouch.py code untouched so you have the option of music player or music player+alarm clock.
import serial import mpd import subprocess import alsaaudio import os import datetime import time ser = serial.Serial('/dev/ttyS0', 9600) # Change /dev/* value to match your arduino serial interface device ser.timeout=.05 # Timeout reduces CPU usage mixer = alsaaudio.Mixer('PCM', 0) # Which audio mixer to control changecheck=" " # variable that 'watches' to see if the song has changed counter=0 # variable used to delay the time to redisplay the Artist/Song after changing volume #alarmhour=int(input("Enter Alarm Hour: ")) #alarmminute=int(input("Enter Alarm Minute: ")) alarmhour=0 # #Enter alarm hour alarmminute=36 #Enter alarm minute snooze=0 flag=0 masteralarmhour=alarmhour #Keep track of a universal alarm hour masteralarmminute=alarmminute #Keep track of a universal alarm minute client = mpd.MPDClient() client.connect("localhost", "6600") def translate(value, leftMin, leftMax, rightMin, rightMax): # Used to translate the value of volume to a 0-100 range for accurate display # Figure out how 'wide' each range is leftSpan = leftMax - leftMin rightSpan = rightMax - rightMin # Convert the left range into a 0-1 range (float) valueScaled = float(value - leftMin) / float(leftSpan) # Convert the 0-1 range into a value in the right range. return rightMin + (valueScaled * rightSpan) while True: now=datetime.datetime.now() #get current time dt = list(time.localtime()) #break down into list hour = dt #set hour minute = dt #set minute second = dt #set second if hour == alarmhour and minute == alarmminute and second == 0 and flag==0: client.play() #Play music mixer.setvolume(100) #At max volume ser.write(now.strftime("%a, %b %d %Y")) #Display date to LCD ser.write('@') #Trigger to skip to next LCD row ser.write(now.strftime(" %H:%M ")) #Display time to LCD ser.write('@') #Trigger to skip to next LCD row ser.write('%') #Trigger to pause ultrasonic inputs print now.strftime("%Y-%m-%d %H:%M") flag=1; #Alarm is playing snooze=1; #Snooze is available snafu=ser.readline().decode('utf-8','ignore')[:-2] #Read serial input SongInfo=client.currentsong() #Pulls information from MPD artist=SongInfo['artist'] #Artist info song=SongInfo['title'] #Song info if len(song) > 16: #Chops artist length to LCD width (16 characters) choppedsong = song[0:15] else: choppedsong = song[0:(len(song))] if len(artist) > 16: #Chops artist length to LCD width (16 characters) choppedartist = artist[0:15] else: choppedartist = artist[0:(len(artist))] if counter==20: #Amount of time to redisplay the Artist/Song after volume change changecheck='' counter=counter+1 if counter>=21: counter=21 if changecheck != choppedsong: #If counter met or song changed write to LCD ser.write(choppedsong) ser.write('@') ser.write(choppedartist) ser.write('@') print choppedsong print choppedartist changecheck=choppedsong if snafu == 'Pause': #Read serial input for Pause, Next, or Volume client.pause(1) print(snafu) ser.write(' Paused') #Print to LCD ser.write('@') #'@' symbol tells the arduino to move to the next row on the LCD counter=21; flag=0; #Alarm already triggered snooze=0; #Turn off snooze alarmhour=masteralarmhour #Reset alarm hour alarmminute=masteralarmminute #Reset alarm minute elif snafu == 'Next': client.next() print(snafu) elif snafu.isdigit() and snooze==1: #If in volume spectrum and alarm is playing client.pause(1) alarmminute=minute+9 #Reset alarm for 9 minutes from now if alarmminute>=60: #Make sure it doesn't go outside of time format alarmminute=0 alarmhour=alarmhour+1 print "Snooze" ser.write(' Snooze ') #Write Snooze to the LCD #ser.write('~') #Trigger code to pause all input from arduino for a short time flag=0; #Flag alarm to go off again #snooze=0; #Flag snooze to go off again elif snafu.isdigit() and snooze==0: #If in volume and alarm is not playing client.play() #Standard music controls mixer.setvolume(int(snafu)) #Set raspi volume according to ultrasonic distance counter=0 ser.write('Vol: ') #Print volume level to LCD print(int(translate(int(snafu),70,100,0,100))) ser.write(snafu) ser.write('@') flag=1; #Tell alarm not to go off when playing normally <br>