Merge pull request #2503 from caternuson/add_piradio

Add code for rpi pirate radio

Author: caternuson

Raspberry_Pi_PiPyPirate_Radio/freq_scan.py

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2023 Carter N. for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import board
+import digitalio
+import adafruit_si4713
+
+radio = adafruit_si4713.SI4713(
+    board.I2C(),
+    reset=digitalio.DigitalInOut(board.D26),
+    timeout_s=0.5
+)
+
+with open("freq_scan.dat", "w") as fp:
+    for f_khz in range(87500, 108000, 50):
+        noise = radio.received_noise_level(f_khz)
+        fp.write("{},{}\n".format(f_khz/1000.0, noise))
+        print('{0:0.3f} mhz = {1} dBuV'.format(f_khz/1000.0, noise))

Raspberry_Pi_PiPyPirate_Radio/mpd.conf

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+music_directory		"/home/pi/music"
+playlist_directory	"/home/pi/playlists"
+
+audio_output {
+       type            "alsa"
+       name            "USB Audio Adapter" 
+       device          "hw:2,0"
+}

Raspberry_Pi_PiPyPirate_Radio/radio.py

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+# SPDX-FileCopyrightText: 2023 Carter N. for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import digitalio
+import adafruit_si4713
+from PIL import Image, ImageDraw, ImageFont
+from adafruit_rgb_display import st7789
+import mpd
+
+#--| User Config |-----------------------------------
+FREQ = 89.00
+PLAYLIST = "test"
+STATION_NAME = "PiPyPirate Radio"
+UPDATE_RATE = 0.5
+#----------------------------------------------------
+
+#==| SETUP |=========================================================
+
+# Display
+disp = st7789.ST7789(
+    board.SPI(),
+    height=240,
+    y_offset=80,
+    rotation=180,
+    cs=digitalio.DigitalInOut(board.CE0),
+    dc=digitalio.DigitalInOut(board.D25),
+    rst=digitalio.DigitalInOut(board.D24),
+    baudrate=64000000,
+)
+
+backlight = digitalio.DigitalInOut(board.D22)
+backlight.switch_to_output()
+backlight.value = True
+
+background = Image.open("radio_bg.png")
+STAT_FNT = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSansCondensed-Bold.ttf", 55)
+STAT_CLR = (30, 100, 200)
+INFO_FNT = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 20)
+ARTS_CLR = (0, 100, 0)
+ALBM_CLR = (0, 100, 0)
+TITL_CLR = (0, 100, 0)
+PROG_CLR = (0, 100, 0)
+
+# Buttons
+button1 = digitalio.DigitalInOut(board.D23)
+button1.switch_to_input(pull=digitalio.Pull.UP)
+button2 = digitalio.DigitalInOut(board.D24)
+button2.switch_to_input(pull=digitalio.Pull.UP)
+
+# Radio
+radio = adafruit_si4713.SI4713(
+    board.I2C(),
+    reset=digitalio.DigitalInOut(board.D26),
+    timeout_s = 0.5
+)
+radio.tx_frequency_khz = int(FREQ * 1000)
+radio.tx_power = 115
+radio.configure_rds(0xADAF, station=STATION_NAME.encode())
+
+# MPD
+mpc = mpd.MPDClient()
+mpc.connect("localhost", 6600)
+mpc.stop()
+mpc.clear()
+mpc.load(PLAYLIST)
+mpc.play()
+mpc.repeat(1)
+#====================================================================
+
+def button1_handler():
+    if status['state'] == 'play':
+        mpc.pause()
+    else:
+        mpc.play()
+
+def button2_handler():
+    mpc.next()
+
+def update_display():
+    image = background.copy()
+    draw = ImageDraw.Draw(image)
+
+    draw.text(
+        (150, 20),
+        "{:>5.1f}".format(FREQ),
+        anchor="mt",
+        font=STAT_FNT,
+        fill=STAT_CLR
+    )
+
+    if status['state'] == 'play':
+        r = 10 * (1 + int(time.monotonic() % 3))
+        draw.arc( (30-r, 20-r, 30+r, 20+r),
+            120, 60,
+            fill = (0, 0, 0),
+            width = 3
+        )
+
+    info = mpc.currentsong()
+    artist = info.get('artist', 'unknown')
+    album = info.get('album', 'unknown')
+    song = info.get('title', 'unknown')
+    draw.text( (5, 150), artist, font=INFO_FNT, fill=ARTS_CLR )
+    draw.text( (5, 170), album, font=INFO_FNT, fill=ALBM_CLR)
+    draw.text( (5, 190), song, font=INFO_FNT, fill=TITL_CLR)
+    rds_info = "{}:{}:{}".format(artist, album, song)
+    radio.rds_buffer = rds_info.encode()
+
+    perc = float(status['elapsed']) / float(status['duration'])
+    draw.rectangle( (5, 215, 235, 230), outline=PROG_CLR)
+    draw.rectangle (
+        (5, 215, 5 + int(230*perc), 230),
+        fill=PROG_CLR
+    )
+
+    disp.image(image)
+
+last_update = time.monotonic()
+
+print("Now broadcasting {} on {}FM".format(STATION_NAME, FREQ))
+
+while True:
+    now = time.monotonic()
+    try:
+        status = mpc.status()
+    except ConnectionError:
+        mpc.connect("localhost", 6600)
+        status = mpc.status()
+    if not button1.value:
+        button1_handler()
+        while not button1.value:
+            time.sleep(0.001)
+    if not button2.value:
+        button2_handler()
+        while not button2.value:
+            time.sleep(0.001)
+    if now - last_update > UPDATE_RATE:
+        update_display()
+        last_update = now