上一篇透過樹莓派讀取 BMP180的溫度、大氣壓力及海拔高度等感測值：Raspberry Pi 筆記(77)：溫度氣壓傳感器模組 BMP180 (GY68)。本篇延續前一篇的讀取感測值結果送到 Line Notify中，直接從 Line 中看到溫度氣壓等相關感測值。
[設定Line Notify]
(1) 先到 Line官方網站，申請一個 Line帳號。有了 Line帳號後，進入 Line Notify 頁面，輸入帳號密碼登入後，可以看到以下畫面：
(2) 選擇 [個人頁面]，按下[發行權杖]
(3) 輸入權杖名稱及選擇要通知的群組，按下發行
[材料]
- Raspberry Pi x 1
- BMP180 (GY68) x 1
- 連接線 x 4條
[接線圖]
Raspberry Pi 與BMP180接腳的對應關係：
| Pi 接腳 | BMP180 |
|---|---|
| Pin 1(+3.3V) | VCC |
| Pin 6(GND) | GND |
| Pin 3 SDA GPIO2 | SDA |
| Pin 5 SCL GPIO3 | SCL |
[程式]
# !/usr/bin/python
# coding:utf-8
import smbus
import time
import requests
from ctypes import c_short
DEVICE = 0x77 # Default device I2C address
#bus = smbus.SMBus(0) # Rev 1 Pi uses 0
bus = smbus.SMBus(1) # Rev 2 Pi uses 1
def convertToString(data):
# Simple function to convert binary data into a string
return str((data[1] + (256 * data[0])) / 1.2)
def getShort(data, index):
# return two bytes from data as a signed 16-bit value
return c_short((data[index] << 8) + data[index + 1]).value
def getUshort(data, index):
# return two bytes from data as an unsigned 16-bit value
return (data[index] << 8) + data[index + 1]
def readBmp180Id(addr=DEVICE):
# Register Address
REG_ID = 0xD0
(chip_id, chip_version) = bus.read_i2c_block_data(addr, REG_ID, 2)
return (chip_id, chip_version)
def readBmp180(addr=DEVICE):
# Register Addresses
REG_CALIB = 0xAA
REG_MEAS = 0xF4
REG_MSB = 0xF6
REG_LSB = 0xF7
# Control Register Address
CRV_TEMP = 0x2E
CRV_PRES = 0x34
# Oversample setting
OVERSAMPLE = 3 # 0 - 3
# Read calibration data
# Read calibration data from EEPROM
cal = bus.read_i2c_block_data(addr, REG_CALIB, 22)
# Convert byte data to word values
AC1 = getShort(cal, 0)
AC2 = getShort(cal, 2)
AC3 = getShort(cal, 4)
AC4 = getUshort(cal, 6)
AC5 = getUshort(cal, 8)
AC6 = getUshort(cal, 10)
B1 = getShort(cal, 12)
B2 = getShort(cal, 14)
MB = getShort(cal, 16)
MC = getShort(cal, 18)
MD = getShort(cal, 20)
# 讀取溫度
bus.write_byte_data(addr, REG_MEAS, CRV_TEMP)
time.sleep(0.005)
(msb, lsb) = bus.read_i2c_block_data(addr, REG_MSB, 2)
UT = (msb << 8) + lsb
# 讀取壓力
bus.write_byte_data(addr, REG_MEAS, CRV_PRES + (OVERSAMPLE << 6))
time.sleep(0.04)
(msb, lsb, xsb) = bus.read_i2c_block_data(addr, REG_MSB, 3)
UP = ((msb << 16) + (lsb << 8) + xsb) >> (8 - OVERSAMPLE)
# Refine temperature
X1 = ((UT - AC6) * AC5) >> 15
X2 = (MC << 11) / (X1 + MD)
B5 = X1 + X2
temperature = (B5 + 8) >> 4
# Refine pressure
B6 = B5 - 4000
B62 = B6 * B6 >> 12
X1 = (B2 * B62) >> 11
X2 = AC2 * B6 >> 11
X3 = X1 + X2
B3 = (((AC1 * 4 + X3) << OVERSAMPLE) + 2) >> 2
X1 = AC3 * B6 >> 13
X2 = (B1 * B62) >> 16
X3 = ((X1 + X2) + 2) >> 2
B4 = (AC4 * (X3 + 32768)) >> 15
B7 = (UP - B3) * (50000 >> OVERSAMPLE)
P = (B7 * 2) / B4
X1 = (P >> 8) * (P >> 8)
X1 = (X1 * 3038) >> 16
X2 = (-7357 * P) >> 16
pressure = P + ((X1 + X2 + 3791) >> 4)
# 計算高度
altitude = 44330.0 * (1.0 - pow(pressure / 101325.0, (1.0/5.255)))
return (temperature/10.0,pressure/ 100.0,round(altitude,2))
def lineNotifyMessage(token, msg):
headers = { "Authorization": "Bearer " + token,"Content-Type" : "application/x-www-form-urlencoded" }
payload = {'message': msg}
r = requests.post("https://notify-api.line.me/api/notify", headers = headers, params = payload)
return r.status_code
def main():
(chip_id, chip_version) = readBmp180Id()
print "Chip ID :", chip_id
print "Version :", chip_version,"\n"
(temperature,pressure,altitude)=readBmp180()
print "溫度 :", temperature, "C"
print "壓力 :", pressure, "mbar"
print "高度 :", altitude, "m\n"
# 傳送訊息字串
message = "\n溫度 : "+ str(temperature)+ " ℃\n壓力 : "+ str(pressure)+ " mbar\n高度 : "+str(altitude)+ " m"
# 修改成你的Token字串
token = 'A5AAAaAaAaA2AAAA81a1AAAaAaaaaaaAAaaaAa9AaAA'
lineNotifyMessage(token, message)
# time.sleep(2)
if __name__=="__main__":
main()
time.sleep(2)
[執行結果]
[參考資料]
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