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buttons.py

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+import signal
+import RPi.GPIO as GPIO
+import requests
+import time
+
+print("""buttons.py - Detect which button has been pressed
+
+This example should demonstrate how to:
+1. set up RPi.GPIO to read buttons,
+2. determine which button has been pressed
+
+Press Ctrl+C to exit!
+
+""")
+
+
+# My music server URL
+url = "http://192.168.0.114:6680/mopidy/rpc"
+lastpress = 0
+
+
+# The buttons on Pirate Audio are connected to pins 5, 6, 16 and 24
+# Boards prior to 23 January 2020 used 5, 6, 16 and 20 
+# try changing 24 to 20 if your Y button doesn't work.
+BUTTONS = [5, 6, 16, 24]
+
+# These correspond to buttons A, B, X and Y respectively
+LABELS = ['A', 'B', 'X', 'Y']
+
+# Set up RPi.GPIO with the "BCM" numbering scheme
+GPIO.setmode(GPIO.BCM)
+
+# Buttons connect to ground when pressed, so we should set them up
+# with a "PULL UP", which weakly pulls the input signal to 3.3V.
+GPIO.setup(BUTTONS, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+
+
+# "handle_button" will be called every time a button is pressed
+# It receives one argument: the associated input pin.
+def handle_button(pin):
+    global lastpress
+    if lastpress + 1 >= time.time():
+        print("dubbel")
+        return
+    
+    label = LABELS[BUTTONS.index(pin)]
+    print("Button press detected on pin: {} label: {}".format(pin, label))
+    actions = {  "A": "core.playback.resume",
+                 "B": "core.playback.pause",
+                 "X": "core.playback.next",
+                 "Y": "core.playback.previous" }
+
+    js1 = { "method": actions[label], "jsonrpc": "2.0", "params": {}, "id": 1 }
+    js2 = requests.post(url, json=js1)
+    uri = js2.json()["result"]
+    print (actions[label], label, uri)
+    lastpress = time.time()
+
+# Loop through out buttons and attach the "handle_button" function to each
+# We're watching the "FALLING" edge (transition from 3.3V to Ground) and
+# picking a generous bouncetime of 100ms to smooth out button presses.
+for pin in BUTTONS:
+    GPIO.add_event_detect(pin, GPIO.FALLING, handle_button, bouncetime=100)
+
+# Finally, since button handlers don't require a "while True" loop,
+# we pause the script to prevent it exiting immediately.
+signal.pause()