[MicroPython]TPYBoard ADC的使用方法
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基本用法
import pyb adc = pyb.ADC(Pin('Y11')) # create an analog object from a pin adc = pyb.ADC(pyb.Pin.board.Y11) val = adc.read() # read an analog value adc = pyb.ADCAll(resolution) # creale an ADCAll object val = adc.read_channel(channel) # read the given channel val = adc.read_core_temp() # read MCU temperature val = adc.read_core_vbat() # read MCU VBAT val = adc.read_core_vref() # read MCU VREF
pyb.ADC(pin)
通过GPIO定义一个ADC
pyb.ADCAll(resolution)
定义ADC的分辨率,可以设置为8/10/12
adc.read()
读取adc的值,返回值与adc分辨率有关,8位最大255,10位最大1023,12位最大4095
adc.read_channel(channel)
读取指定adc通道的值
adc.read_core_temp()
读取内部温度传感器
adc.read_core_vbat()
读取vbat电压
vback = adc.read_core_vbat() * 1.21 / adc.read_core_vref() adc.read_core_vref()
读取vref电压(1.21V参考)
3V3 = 3.3 * 1.21 / adc.read_core_vref()
adc.read_timed(buf, timer)
以指定频率读取adc参数到buf
buf,缓冲区
timer,频率(Hz)
使用这个函数会将ADC的结果限制到8位
adc = pyb.ADC(pyb.Pin.board.X19) # create an ADC on pin X19 buf = bytearray(100) # create a buffer of 100 bytes adc.read_timed(buf, 10) # read analog values into buf at 10Hz # this will take 10 seconds to finish for val in buf: # loop over all values print(val) # print the value out