seeed_relay_test.py

# from Seeed Studio Wiki
# http://wiki.seeed.cc/Raspberry_Pi_Relay_Board_v1.0/

# This Seeed's test app, it does NOT use the library. Use this program to
# test that the relay board is working when you're having trouble with the
# library

import signal
import sys

import smbus

bus = smbus.SMBus(1)  # 0 = /dev/i2c-0 (port I2C0), 1 = /dev/i2c-1 (port I2C1)


class Relay:

    global bus

    def __init__(self):
        self.DEVICE_ADDRESS = 0x20  # 7 bit address (will be left shifted to add the read write bit)
        self.DEVICE_REG_MODE1 = 0x06
        self.DEVICE_REG_DATA = 0xff
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def ON_1(self):
        print('ON_1...')
        self.DEVICE_REG_DATA &= ~(0x1 << 0)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def ON_2(self):
        print('ON_2...')
        self.DEVICE_REG_DATA &= ~(0x1 << 1)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def ON_3(self):
        print('ON_3...')
        self.DEVICE_REG_DATA &= ~(0x1 << 2)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def ON_4(self):
        print('ON_4...')
        self.DEVICE_REG_DATA &= ~(0x1 << 3)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def OFF_1(self):
        print('OFF_1...')
        self.DEVICE_REG_DATA |= (0x1 << 0)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def OFF_2(self):
        print('OFF_2...')
        self.DEVICE_REG_DATA |= (0x1 << 1)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def OFF_3(self):
        print('OFF_3...')
        self.DEVICE_REG_DATA |= (0x1 << 2)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def OFF_4(self):
        print('OFF_4...')
        self.DEVICE_REG_DATA |= (0x1 << 3)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def ALLON(self):
        print('ALL ON...')
        self.DEVICE_REG_DATA &= ~(0xf << 0)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)

    def ALLOFF(self):
        print('ALL OFF...')
        self.DEVICE_REG_DATA |= (0xf << 0)
        bus.write_byte_data(self.DEVICE_ADDRESS, self.DEVICE_REG_MODE1, self.DEVICE_REG_DATA)


if __name__ == "__main__":
    relay = Relay()

    # Called on process interruption. Set all pins to "Input" default mode.
    def endProcess(signalnum=None, handler=None):
        relay.ALLOFF()
        sys.exit()


    signal.signal(signal.SIGINT, endProcess)

    while True:
        ct = raw_input("input: ")
        if ct == '1on':
            relay.ON_1()
        elif ct == '2on':
            relay.ON_2()
        elif ct == '3on':
            relay.ON_3()
        elif ct == '4on':
            relay.ON_4()
        elif ct == '1off':
            relay.OFF_1()
        elif ct == '2off':
            relay.OFF_2()
        elif ct == '3off':
            relay.OFF_3()
        elif ct == '4off':
            relay.OFF_4()
        elif ct == 'allon':
            relay.ALLON()
        elif ct == 'alloff':
            relay.ALLOFF()