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[Micropython TPYBoard ] ADC的使用方法

助工
2018-05-24 10:46:59     打赏

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




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