demo.py

import time


def test_clock():
    import pidev.Clock
    clk = pidev.Clock.DS3231()
    print('Setting time to 2013-02-15 16:30:59 ...')
    clk.set_datetime(user_input=[2013, 2, 15, 16, 30, 59])
    print('Checking time:')
    i = 0
    for i in range(5):
        print(clk.get_datetime(output_obj=False))
        i += 1
        time.sleep(1)
    print('Setting time to current system time ...')
    clk.set_datetime()
    print('Checking time:')
    i = 0
    for i in range(5):
        print(clk.get_datetime(output_obj=False))
        i += 1
        time.sleep(1)
    return


def test_screen():
    import pidev.Screen
    import spidev
    from PIL import Image, ImageDraw, ImageFont
    oled = pidev.Screen.SSD1306(19, 16, spidev.SpiDev(0, 0))
    oled.begin()
    oled.clear()
    oled.display()
    image = Image.new('1', (128, 64))
    draw = ImageDraw.Draw(image)
    draw.rectangle((0, 0, 127, 15), outline=1, fill=0)
    draw.rectangle((0, 16, 127, 63), outline=1, fill=0)
    font = ImageFont.load_default()
    draw.text((2, 2), 'Hello', font=font, fill=255)
    draw.text((2, 22), 'World!', font=font, fill=255)
    oled.image(image)
    oled.display()
    return


def adc_show():
    import spidev
    import pidev.Screen
    import pidev.ADC
    from PIL import Image, ImageDraw, ImageFont
    oled = pidev.Screen.SSD1306(19, 16, spidev.SpiDev(0, 0))
    oled.begin()
    oled.clear()
    oled.display()
    font = ImageFont.load_default()
    font_title = ImageFont.truetype('fonts/RobotoMono-Regular.ttf', size=10)
    font_value = ImageFont.truetype('fonts/RobotoMono-Regular.ttf', size=24)
    screen_fixed = Image.new('1', (128, 64))
    draw_fixed = ImageDraw.Draw(screen_fixed)
    # draw_fixed.rectangle((0, 0, 127, 15), outline=1, fill=0)
    # draw_fixed.rectangle((0, 16, 127, 63), outline=1, fill=0)
    draw_fixed.text((5, 2), 'Raw Voltage', font=font_title, fill=255)
    signal = pidev.ADC.Signal('AIN0')
    while True:
        value = signal.measure() * 2  # half of 2kOhm circuit
        screen_update = Image.new('1', (126, 46))
        screen_fixed.paste(screen_update, (1, 17))
        draw_update = ImageDraw.Draw(screen_update)
        draw_update.text((5, 5), '{:.3f} V'.format(value), font=font_value, fill=255)
        screen_fixed.paste(screen_update, (1, 17))
        oled.image(screen_fixed)
        oled.display()
        print('{:.3f}'.format(value))
        time.sleep(0.5)


def main():
    adc_show()
    return


if __name__ == "__main__":
    main()