first commit

temperature.py

@@ -0,0 +1,146 @@
+#coding: utf-8
+
+from smbus2 import SMBus
+import time
+
+bus_number  = 1
+i2c_address = 0x76
+
+bus = SMBus(bus_number)
+
+digT = []
+digP = []
+digH = []
+
+t_fine = 0.0
+
+
+def writeReg(reg_address, data):
+	bus.write_byte_data(i2c_address,reg_address,data)
+
+def get_calib_param():
+	calib = []
+
+	for i in range (0x88,0x88+24):
+		calib.append(bus.read_byte_data(i2c_address,i))
+	calib.append(bus.read_byte_data(i2c_address,0xA1))
+	for i in range (0xE1,0xE1+7):
+		calib.append(bus.read_byte_data(i2c_address,i))
+
+	digT.append((calib[1] << 8) | calib[0])
+	digT.append((calib[3] << 8) | calib[2])
+	digT.append((calib[5] << 8) | calib[4])
+	digP.append((calib[7] << 8) | calib[6])
+	digP.append((calib[9] << 8) | calib[8])
+	digP.append((calib[11]<< 8) | calib[10])
+	digP.append((calib[13]<< 8) | calib[12])
+	digP.append((calib[15]<< 8) | calib[14])
+	digP.append((calib[17]<< 8) | calib[16])
+	digP.append((calib[19]<< 8) | calib[18])
+	digP.append((calib[21]<< 8) | calib[20])
+	digP.append((calib[23]<< 8) | calib[22])
+	digH.append( calib[24] )
+	digH.append((calib[26]<< 8) | calib[25])
+	digH.append( calib[27] )
+	digH.append((calib[28]<< 4) | (0x0F & calib[29]))
+	digH.append((calib[30]<< 4) | ((calib[29] >> 4) & 0x0F))
+	digH.append( calib[31] )
+
+	for i in range(1,2):
+		if digT[i] & 0x8000:
+			digT[i] = (-digT[i] ^ 0xFFFF) + 1
+
+	for i in range(1,8):
+		if digP[i] & 0x8000:
+			digP[i] = (-digP[i] ^ 0xFFFF) + 1
+
+	for i in range(0,6):
+		if digH[i] & 0x8000:
+			digH[i] = (-digH[i] ^ 0xFFFF) + 1  
+
+def readData():
+	data = []
+	for i in range (0xF7, 0xF7+8):
+		data.append(bus.read_byte_data(i2c_address,i))
+	pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4)
+	temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4)
+	hum_raw  = (data[6] << 8)  |  data[7]
+
+	compensate_T(temp_raw)
+	compensate_P(pres_raw)
+	compensate_H(hum_raw)
+
+def compensate_P(adc_P):
+	global  t_fine
+	pressure = 0.0
+
+	v1 = (t_fine / 2.0) - 64000.0
+	v2 = (((v1 / 4.0) * (v1 / 4.0)) / 2048) * digP[5]
+	v2 = v2 + ((v1 * digP[4]) * 2.0)
+	v2 = (v2 / 4.0) + (digP[3] * 65536.0)
+	v1 = (((digP[2] * (((v1 / 4.0) * (v1 / 4.0)) / 8192)) / 8)  + ((digP[1] * v1) / 2.0)) / 262144
+	v1 = ((32768 + v1) * digP[0]) / 32768
+
+	if v1 == 0:
+		return 0
+	pressure = ((1048576 - adc_P) - (v2 / 4096)) * 3125
+	if pressure < 0x80000000:
+		pressure = (pressure * 2.0) / v1
+	else:
+		pressure = (pressure / v1) * 2
+	v1 = (digP[8] * (((pressure / 8.0) * (pressure / 8.0)) / 8192.0)) / 4096
+	v2 = ((pressure / 4.0) * digP[7]) / 8192.0
+	pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)  
+
+	print "pressure : %7.2f hPa" % (pressure/100)
+
+def compensate_T(adc_T):
+	global t_fine
+	v1 = (adc_T / 16384.0 - digT[0] / 1024.0) * digT[1]
+	v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (adc_T / 131072.0 - digT[0] / 8192.0) * digT[2]
+	t_fine = v1 + v2
+	temperature = t_fine / 5120.0
+	print "temp : %-6.2f ℃" % (temperature) 
+
+def compensate_H(adc_H):
+	global t_fine
+	var_h = t_fine - 76800.0
+	if var_h != 0:
+		var_h = (adc_H - (digH[3] * 64.0 + digH[4]/16384.0 * var_h)) * (digH[1] / 65536.0 * (1.0 + digH[5] / 67108864.0 * var_h * (1.0 + digH[2] / 67108864.0 * var_h)))
+	else:
+		return 0
+	var_h = var_h * (1.0 - digH[0] * var_h / 524288.0)
+	if var_h > 100.0:
+		var_h = 100.0
+	elif var_h < 0.0:
+		var_h = 0.0
+	print "hum : %6.2f ％" % (var_h)
+
+
+def setup():
+	osrs_t = 1			#Temperature oversampling x 1
+	osrs_p = 1			#Pressure oversampling x 1
+	osrs_h = 1			#Humidity oversampling x 1
+	mode   = 3			#Normal mode
+	t_sb   = 5			#Tstandby 1000ms
+	filter = 0			#Filter off
+	spi3w_en = 0			#3-wire SPI Disable
+
+	ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode
+	config_reg    = (t_sb << 5) | (filter << 2) | spi3w_en
+	ctrl_hum_reg  = osrs_h
+
+	writeReg(0xF2,ctrl_hum_reg)
+	writeReg(0xF4,ctrl_meas_reg)
+	writeReg(0xF5,config_reg)
+
+
+setup()
+get_calib_param()
+
+
+if __name__ == '__main__':
+	try:
+		readData()
+	except KeyboardInterrupt:
+		pass