http://blog.rareschool.com/2021/02/raspberry-pi-pico-project-2-mcp3008.html
のbitearray(3)とはどういう意味ですか?
from machine import Pin, SPI from time import sleep, sleep_ms spi = SPI(0, sck=Pin(2),mosi=Pin(3),miso=Pin(4), baudrate=100000) #周波数100kHzでSPIペリフェラル0を作成、sckはGP2、mosiはGP3、misoはGP4 cs = Pin(22, Pin.OUT) cs.value(1) # disable chip at start square = Pin(21, Pin.OUT) class MCP3008: def __init__(self, spi, cs, ref_voltage=3.3): """ Create MCP3008 instance Args: spi: configured SPI bus cs: pin to use for chip select ref_voltage: r """ self.cs = cs self.cs.value(1) # ncs on self._spi = spi self._out_buf = bytearray(3) self._out_buf[0] = 0x01 self._in_buf = bytearray(3) self._ref_voltage = ref_voltage def reference_voltage(self) -> float: """Returns the MCP3xxx's reference voltage as a float.""" return self._ref_voltage def read(self, pin, is_differential=False): """ read a voltage or voltage difference using the MCP3008. Args: pin: the pin to use is_differential: if true, return the potential difference between two pins, Returns: voltage in range [0, 1023] where 1023 = VREF (3V3) """ self.cs.value(0) # select self._out_buf[1] = ((not is_differential) << 7) | (pin << 4) self._spi.write_readinto(self._out_buf, self._in_buf) self.cs.value(1) # turn off return ((self._in_buf[1] & 0x03) << 8) | self._in_buf[2] chip = MCP3008(spi, cs) while True: square.value(1) actual = chip.read(0) print(actual) sleep(0.5) square.value(0) actual = chip.read(0) print(actual) sleep(0.5)

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