Gets temperature from USB Temper, show it by LED lighting of BerryClip on Raspberry Pi and log it into a file.

gistfile1.py

#!/usr/bin/python
# coding: utf-8

import RPi.GPIO as GPIO
import datetime
import logging
import usb

from temperusb import TemperDevice


GREEN_LED_1 = 4
GREEN_LED_2 = 17
YELLOW_LED_1 = 22
YELLOW_LED_2 = 10
RED_LED_1 = 9
RED_LED_2 = 11

MIN_TEMP = 16
MAX_TEMP = 28

LEDS = [
    GREEN_LED_1, GREEN_LED_2, YELLOW_LED_1, YELLOW_LED_2, RED_LED_1, RED_LED_2
]

VENDOR_ID = 0x0c45
PRODUCT_ID = 0x7401

logging.basicConfig(
    format='%(message)s',
    filename='temper.log',
    level=logging.INFO,
)
logger = logging.getLogger('temperature')

dev = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
TDev = TemperDevice(dev)


def init():
    GPIO.setmode(GPIO.BCM)
    for led in LEDS:
        GPIO.setup(led, GPIO.OUT)
        GPIO.output(led, False)


def show_temperature():
    old_active_leds = 0
    old_temp = 0

    while True:
        temp = round(TDev.get_temperature(), 1)
        active_leds = int(
            (temp - MIN_TEMP) / ((MAX_TEMP - MIN_TEMP) / len(LEDS))
        )
        if active_leds != old_active_leds:
            for led in LEDS:
                GPIO.output(led, False)

            for led in LEDS[:active_leds]:
                GPIO.output(led, True)

        if temp != old_temp:
            time_stop = datetime.datetime.now()
            print '%s: %s ºC (Active LEDS: %s)' % (
                time_stop.strftime('%Y-%m-%d %H:%M:%S'), temp, active_leds
            )
            logger.info(
                '%s;%s;%s' % (
                    time_stop.strftime('%Y-%m-%d %H:%M:%S'), temp, active_leds
                )
            )
        old_active_leds = active_leds
        old_temp = temp


if __name__ == '__main__':
    try:
        init()
        show_temperature()
    except KeyboardInterrupt:
        GPIO.cleanup()