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| ####################### | |
| # Author : Alex Baizeau | |
| # | |
| # The Credit for the analog input part goes to adafruit : http://bit.ly/VHTEmS | |
| ######################## | |
| from i2clibraries import i2c_lcd | |
| from time import * | |
| import time | |
| import os | |
| from mplayer import Player | |
| import RPi.GPIO as GPIO | |
| # Configuration parameters | |
| # I2C Address, Port, Enable pin, RW pin, RS pin, Data 4 pin, Data 5 pin, Data | |
| # 6 pin, Data 7 pin, Backlight pin (optional) | |
| lcd = i2c_lcd.i2c_lcd(0x3f,1, 2, 1, 0, 4, 5, 6, 7, 3) | |
| # If you want to disable the cursor, uncomment the following line | |
| # lcd.command(lcd.CMD_Display_Control | lcd.OPT_Enable_Display) | |
| lcd.backLightOn() | |
| lcd.writeString("Alex Web Radio") | |
| lcd.setPosition(2, 3) | |
| lcd.writeString("For the Pi") | |
| DEBUG = 0 | |
| p =Player() | |
| radio_urls = [ | |
| "http://1671.live.streamtheworld.com/CBC_R1_OTT_H", | |
| 'http://hd2.lagrosseradio.info:8300/', | |
| 'http://95.81.147.3/nostalgie/all/nos_113812.mp3', | |
| ] | |
| radio_names = [ | |
| "CBC Radio 1", | |
| "Grosse Radio Reggae", | |
| "Nostalgie", | |
| ] | |
| count_radios = len(radio_urls); | |
| current_radio_index = 0 | |
| radio_index = 0 | |
| GPIO.setmode(GPIO.BCM) | |
| DEBUG = 1 | |
| # remap the a range of number to another | |
| def translate(value, leftMin, leftMax, rightMin, rightMax): | |
| # 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) | |
| print ("value", value) | |
| # Convert the 0-1 range into a value in the right | |
| # range. | |
| return round(rightMin + (valueScaled * rightSpan)) | |
| # read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7) | |
| def readadc(adcnum, clockpin, mosipin, misopin, cspin): | |
| if ((adcnum > 7) or (adcnum < 0)): | |
| return -1 | |
| GPIO.output(cspin, True) | |
| GPIO.output(clockpin, False) # start clock low | |
| GPIO.output(cspin, False) # bring CS low | |
| commandout = adcnum | |
| commandout |= 0x18 # start bit + single-ended bit | |
| commandout <<= 3 # we only need to send 5 bits here | |
| for i in range(5): | |
| if (commandout & 0x80): | |
| GPIO.output(mosipin, True) | |
| else: | |
| GPIO.output(mosipin, False) | |
| commandout <<= 1 | |
| GPIO.output(clockpin, True) | |
| GPIO.output(clockpin, False) | |
| adcout = 0 | |
| # read in one empty bit, one null bit and 10 ADC bits | |
| for i in range(12): | |
| GPIO.output(clockpin, True) | |
| GPIO.output(clockpin, False) | |
| adcout <<= 1 | |
| if (GPIO.input(misopin)): | |
| adcout |= 0x1 | |
| GPIO.output(cspin, True) | |
| adcout >>= 1 # first bit is 'null' so drop it | |
| return adcout | |
| # change these as desired - they're the pins connected from the | |
| # SPI port on the ADC to the Cobbler | |
| SPICLK = 18 | |
| SPIMISO = 23 | |
| SPIMOSI = 24 | |
| SPICS = 25 | |
| # set up the SPI interface pins | |
| GPIO.setup(SPIMOSI, GPIO.OUT) | |
| GPIO.setup(SPIMISO, GPIO.IN) | |
| GPIO.setup(SPICLK, GPIO.OUT) | |
| GPIO.setup(SPICS, GPIO.OUT) | |
| # 10k trim pot connected to adc #0 | |
| potentiometer_adc = 0; | |
| last_read = 0 # this keeps track of the last potentiometer value | |
| tolerance = 5 # A little bit of hysteresis | |
| while True: | |
| # we'll assume that the pot didn't move | |
| # we'll assume that the pot didn't move | |
| trim_pot_changed = False | |
| # read the analog pin | |
| trim_pot = readadc(potentiometer_adc, SPICLK, SPIMOSI, SPIMISO, SPICS) | |
| # how much has it changed since the last read? | |
| pot_adjust = abs(trim_pot - last_read) | |
| if ( pot_adjust > tolerance ): | |
| trim_pot_changed = True | |
| #if trim pot changed check if we need to chasnge the radio | |
| #find the index of the radio | |
| radio_index = translate(trim_pot,0,1024,0,count_radios - 1 ) | |
| print ("new radio index:",radio_index) | |
| print ("current radio index" , current_radio_index) | |
| if ( radio_index != current_radio_index ): | |
| print (" different new radio index:",radio_index) | |
| print ("different current radio index" , current_radio_index) | |
| lcd.clear() | |
| lcd.setPosition(1, 0) | |
| lcd.writeString(radio_names[radio_index]) | |
| p.loadfile(radio_urls[radio_index]) | |
| current_radio_index = radio_index | |
| # save the potentiometer reading for the next loop | |
| last_read = trim_pot |
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