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低成本气压式高度计制作教程（代码与接线部分）

来源：哔哩哔哩 时间： 2023-07-12 04:47:25

from micropython import const


【资料图】

from machine import I2C

BMP280_I2C_ADDR = const(0x76)

class BMP280():

def __init__(self, i2c):

= i2c

= bytearray(1)

= bytearray(1)

_T1 = (0x88)

_T2 = ((0x8A))

_T3 = ((0x8C))

_P1 = (0x8E)

_P2 = ((0x90))

_P3 = ((0x92))

_P4 = ((0x94))

_P5 = ((0x96))

_P6 = ((0x98))

_P7 = ((0x9A))

_P8 = ((0x9C))

_P9 = ((0x9E))

= 3

_p = 3

_t = 1

(0xF4, 0x2F)

(0xF5, 0x0C)

= 3

= 0

= 0

= ''

defshort(self,dat):

if dat > 32767:

return dat - 65536

else:

return dat

# set reg

defsetReg(self, reg, dat):

[0] = dat

_mem(BMP280_I2C_ADDR, reg, )

# get reg

defgetReg(self, reg):

_mem_into(BMP280_I2C_ADDR, reg, )

return [0]

# get two reg

defget2Reg(self, reg):

return (reg) + (reg+1) * 256

def get(self):

adc_T = ((0xFA)<<12) + ((0xFB)<<4) + ((0xFC)>>4)

var1 = (((adc_T>>3)-(_T1<<1))*_T2)>>11

var2 = (((((adc_T>>4)-_T1)*((adc_T>>4) - _T1))>>12)*_T3)>>14

t = var1+var2

= ((t * 5 + 128) >> 8)/100

var1 = (t>>1) - 64000

var2 = (((var1>>2) * (var1>>2)) >> 11 ) * _P6

var2 = var2 + ((var1*_P5)<<1)

var2 = (var2>>2)+(_P4<<16)

var1 = (((_P3*((var1>>2)*(var1>>2))>>13)>>3) + (((_P2) * var1)>>1))>>18

var1 = ((32768+var1)*_P1)>>15

if var1 == 0:

return  # avoid exception caused by division by zero

adc_P = ((0xF7)<<12) + ((0xF8)<<4) + ((0xF9)>>4)

p=((1048576-adc_P)-(var2>>12))*3125

if p < 0x80000000:

p = (p << 1) // var1

else:

p = (p // var1) * 2

var1 = (_P9 * (((p>>3)*(p>>3))>>13))>>12

var2 = (((p>>2)) * _P8)>>13

= p + ((var1 + var2 + _P7) >> 4)

return [, ]

# get Temperature in Celsius

def getTemp(self):

()

return

# get Pressure in Pa

def getPress(self):

()

return

# Calculating absolute altitude

defgetAltitude(self):

return 44330*(1-(()/101325)**(1/))

# sleep mode

def poweroff(self):

(0xF4, 0)

# normal mode

def poweron(self):

(0xF4, 0x2F)

===================================================================<<<<<<<

import time

from machine import Pin,I2C

import _thread

import bmp280

def run():

i2c = I2C(sda=Pin(6), scl=Pin(7))

b = (i2c)

da = 0

t=0

try:

while(1):

da=da+1

f = open("date"+str(da)+".txt",'r')

()

except:

f = open("date"+str(da)+".txt",'a')

('气压计数据记录\n')

("记录时间:  原始温度和气压:  高度:\n")

()

while(True):

_ms(100)

f = open("date"+str(da)+".txt",'a')

t=t+1

y = ()

p = ()

h = (101325-p)*9/100

dat = (str(t/10)+"  "+str(y)+"  "+str(h)+"\n")

(dat)

#print(h)

()

pboot = Pin(9,)

def bled():

led4 = Pin(12,)

led5 = Pin(13,)

while(True):

()

_ms(500)

()

()

_ms(500)

()

#__new_thread(bled,())

while(1):

_ms(100)

if(()==0):

__new_thread(bled,())

run()

break

关于接线图

SDA=IO06        SCL=IO07        VCC=        GND=GND

==========        ==========         ==========         ========== 

电池        正极=+5v        负极=GND

==========        ==========         ==========         ========== 

最后模块接到usb的5伏电源或者

把正5伏和gnd接到一块满电1s电池上

切记其他电池（2s-6s）只能插平衡头来获取1s电压

否则直接看烟花

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