max31865电路图（max31865接线）

科技前沿 • 2025-04-19 22:21 • 阅读 35
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 1 from time import sleep,sleep_ms  2 from machine import SPI,Pin,SoftSPI  3  4 class MAX31865:  5 def init(self,  6  sck,  7  mosi,  8  miso,  9  cs,  10 baudrate=,  11 polarity=0,  12 phase=1,  13 firstbit=SPI.MSB,  14 debug=False,  15 compensation=0):  16 ”’  17  默认  18  baudrate= 10M  19  polarity=0  20  phase =1  21  MSB  22  compensation=0  23 ”’  24  25 self.cs = Pin(cs,Pin.OUT)  26 self.max31865 = SoftSPI(baudrate=baudrate,  27 polarity=polarity,phase=phase,  28 firstbit=SPI.MSB,  29 sck=Pin(sck),  30 mosi=Pin(mosi),  31 miso=Pin(miso))  32 self.compensation = compensation  33  self.max31865.init()  34 self.DEBUG = debug  35  self.config()  36  37 def config(self,value=b‘x80xd3’):  38 ”’  39  默认:  40  连续转换 bias on  41 ”’  42  self.cs.off()  43  self.max31865.write(value)  44  self.cs.on()  45 pass  46  47 def readConfig(self):  48 ”’  49  读配置寄存器  50 ”’  51  self.cs.off()  52 self.max31865.write(b‘x00’)  53 config = self.max31865.read(1)  54  self.cs.on()  55 if self.DEBUG:  56 print(config)  57 return(config)  58  59 def readADC(self):  60 ”’  61  读ADC值  62 ”’  63  self.cs.off()  64 self.max31865.write(b‘x01’)  65 msb = self.max31865.read(1)  66 lsb = self.max31865.read(1)  67  self.cs.on()  68 if self.DEBUG:  69 print(“ -&gt;msb:”+str(msb)+“;lsb:”+str(lsb))  70 return(msb[0],lsb[0])  71  72 def readHFault(self):  73 ”’  74  读上界限寄存器  75 ”’
  76  self.cs.off()  77 self.max31865.write(b‘x03’)  78 msb = self.max31865.read(1)  79 lsb = self.max31865.read(1)  80  self.cs.on()  81 if self.DEBUG:  82 print(“ -&gt;hfmsb:”+str(msb)+“;hflsb:”+str(lsb))  83 return(msb[0],lsb[0])  84  85 def readLFault(self):  86 ”’  87  读下界限寄存器  88 ”’
  89  self.cs.off()  90 self.max31865.write(b‘x05’)  91 msb = self.max31865.read(1)  92 lsb = self.max31865.read(1)  93  self.cs.on()  94 if self.DEBUG:  95 print(“ -&gt;hfmsb:”+str(msb)+“;hflsb:”+str(lsb))  96 return(msb[0],lsb[0])  97  98 def readFault(self):  99 ”’ 100  读错误 101 ”’
 102  self.cs.off() 103 self.max31865.write(b‘x07’) 104 config = self.max31865.read(1) 105  self.cs.on() 106 if self.DEBUG: 107 print(“ fault:”,config) 108 return(config) 109 110 def readTemperature(self): 111 ”’ 112  读温度值 113 ”’ 114 m,l = self.readADC() 115 adc_code = (((m*256)+l)&gt;&gt;1) 116 temp = ((adc_code/32) -256) 117 r_pt = ((adc_code*430)/32768) 118 temperature = (2.57*r_pt-257+self.compensation) 119 return(temperature)
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max31865电路图（max31865接线）

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