i2c接続のBME280センサーで取得した値を LCD(AQM0802A)に描画する

dispToTemp.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

# 温度計の温度をLCDに表示する

import smbus
import time
from datetime import datetime

class BME280:
    def __init__(self):
        self.bus_number = 1
        self.i2c_address = 0x76
        self.bus = smbus.SMBus(self.bus_number)
        self.digT = []
        self.t_fine = 0.0

    def writeReg(self, reg_address, data):
        self.bus.write_byte_data(self.i2c_address, reg_address, data)

    def get_calib_param(self):
        calib = []
        for i in range(0x88, 0x88+24):
            calib.append(self.bus.read_byte_data(self.i2c_address, i))
        calib.append(self.bus.read_byte_data(self.i2c_address, 0xA1))

        for i in range(0xE1, 0xE1+7):
            calib.append(self.bus.read_byte_data(self.i2c_address, i))

        self.digT.append((calib[1] << 8) | calib[0])
        self.digT.append((calib[3] << 8) | calib[2])
        self.digT.append((calib[5] << 8) | calib[4])

        for i in range(1, 2):
            if self.digT[i] & 0x8000:
                self.digT[i] = (-self.digT[i] ^ 0xFFFF) + 1

    def readData(self):
        data = []
        for i in range(0xF7, 0xF7+8):
            data.append(self.bus.read_byte_data(self.i2c_address, i))
        temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4)
        return self.compensate_T(temp_raw)

    def compensate_T(self, adc_T):
        # global t_fine
        self.t_fine
        v1 = (adc_T / 16384.0 - self.digT[0] / 1024.0) * self.digT[1]
        v2 = (adc_T / 131072.0 - self.digT[0] / 8192.0) * (adc_T / 131072.0 - self.digT[0] / 8192.0) * self.digT[2]
        t_fine = v1 + v2
        temperature = t_fine / 5120.0
        # print "temp : %-6.2f ℃" % (temperature)
        # print "%.1f" % (temperature)
        return round(temperature,1)

    def setup(self):
        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

        self.writeReg(0xF2, ctrl_hum_reg)
        self.writeReg(0xF4, ctrl_meas_reg)
        self.writeReg(0xF5, config_reg)


class i2clcd:
    i2c = smbus.SMBus(1)
    addr = 0x3e
    contrast = 42   # 0～63

    def __init__(self):
        self.i2c.write_byte_data(self.addr, 0, 0x38)    # function set(IS=0)
        self.i2c.write_byte_data(self.addr, 0, 0x39)    # function set(IS=1)
        self.i2c.write_byte_data(self.addr, 0, 0x14)    # internal osc
        self.i2c.write_byte_data(self.addr, 0,
                    (0x70 | (self.contrast & 0x0f)))    # contrast
        self.i2c.write_byte_data(self.addr, 0,
                    (0x54 | ((self.contrast >> 4) & 0x03)))      # contrast/icon/power
        self.i2c.write_byte_data(self.addr, 0, 0x6B)    # follower control
        # self.i2c.write_byte_data(self.addr, 0, 0x6c)    # follower control
        time.sleep(0.2)

    def clear(self):
        self.i2c.write_byte_data(self.addr, 0, 0x38)    # function set(IS=0)
        self.i2c.write_byte_data(self.addr, 0, 0x70)    # Constract
        self.i2c.write_byte_data(self.addr, 0, 0x0C)    # Display On
        self.i2c.write_byte_data(self.addr, 0, 0x01)    # Clear Display
        self.i2c.write_byte_data(self.addr, 0, 0x06)    # Entry Mode Set
        time.sleep(0.2)

    def puts(self, msg):
        self.i2c.write_byte_data(self.addr, 0, 0x38)    # function set(IS=0)
        [self.i2c.write_byte_data(self.addr, 0x40, ord(c)) for c in msg]

    def setaddress(self, line, col):
        self.i2c.write_byte_data(self.addr, 0, 0x38)    # function set(IS=0)
        self.i2c.write_byte_data(self.addr, 0, 0x80 | (0x40 if line > 0 else 0) | col)

    def setcg(self, no, cg):
        self.i2c.write_byte_data(self.addr, 0, 0x38)    # function set(IS=0)
        self.i2c.write_byte_data(self.addr, 0, 0x40 | (no << 3))
        [self.i2c.write_byte_data(self.addr, 0x40, c) for c in cg]

    def putcg(self, line, col, no):
        self.setaddress(line, col)
        self.i2c.write_byte_data(self.addr, 0x40, no)


if __name__ == '__main__':
    try:
        # クラスの宣言
        bme280 = BME280()
        bme280.setup()
        bme280.get_calib_param()
        temperature = bme280.readData()

        lcd = i2clcd()

        # 度記号
        cgchar0 = (0b00000,
                   0b00001,
                   0b01100,
                   0b10010,
                   0b10000,
                   0b10010,
                   0b01100)
        lcd.setcg(0, cgchar0)

        lcd.clear()

        while True:
            lcd.setaddress(0, 3)
            lcd.puts(str(temperature))
            lcd.putcg(0, 7, 0)
            # 現在時間
            lcd.setaddress(1, 0)
            lcd.puts(datetime.now().strftime("%H:%M:%S"))
            time.sleep(1)


    except KeyboardInterrupt:
        pass