mcp3008

class Mcp3008:
    def __init__(self, bus=0, device=0):
        self.spi = spidev.SpiDev(device, bus)
        self.spi.max_speed_hz = 10 ** 5

    def read_channel(self, ch):
        adc = self.spi.xfer2([1, (8 + ch) << 4, 0])
        data = ((adc[1] & 3) << 8) + adc[2]
        return data