【Micropython DIY】 Make a voltmeter using adc and uart

lehuijie

【Micropython DIY】 Make a voltmeter using adc and uart [Copy link]

 

Now that I have free time, I'll come and post, otherwise D will think I've run away Here is the program, which mainly uses uart to output the voltage value read from ADC

1. >>> from pyb import UART >>> from array import array >>> from pyb import ADC >>> from pyb import DAC >>> from pyb import Pin >>> v=ADC(Pin.cpu.A0) >>> u=v.read() >>> x=3.3*u/4096 >>> x=x*10 >>> x1=x/10 >>> x2=x%10 >>> u1=UART(1,9600) >>> u1.writechar(int(x1)+48) >>> u1.writechar(int(x2)+48)

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u1.writechar() Send, the data read from the adc must be int() to int type before sending, otherwise an error message will be prompted. Of course, you can also use while to loop to read the adc, or you can judge the adc and measure the waveform frequency and peak value This content is originally created by EEWORLD forum user lehuijie. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

dcexpert

UART can directly send bytearray type, which is equivalent to the array in C and is more efficient than writechar.

lehuijie

(x1)+48) >>> a.append(int(x2)+48) >>> u1.write(a) 16 [code] [code] import math >>> from pyb import UART >>> from array import array >>> from pyb import ADC >>> from pyb import DAC >>> from pyb import Pin >>> v=ADC(Pin.cpu.A0) >>> u=v.read() >>> x=3.3*u/4096 >>> x=x*10 >>> x1=x/10 >>> x2=x%10 >>> a=array('i') >>> a.append(int(x1)) >>> a.append(int(x2)) >>> u1=UART(1,9600) >>> a.append(int(x1)+48) >>> a.append(int(x2)+48) >>> u1.write(a) 16 [code] I forgot to convert the ASCII code before