文章目录

前言

用树莓派4b做一个温湿度检测仪，温湿度传感器模块SHT20收集温湿度数据，在OLED SSD1306上显示，同时把数据上传到onenet平台用网页显示。

所需材料：树莓派；SHT20温湿度传感器；Oled屏幕 ssd1306/1106；杜邦线；面包板

本文所出现的代码均在我的码云上，地址：temperater程序

[2020.6.11]

一、硬件连接

SHT20和SSD1306和树莓派之间使用I2C总线通信方式，引脚连接如下：

GND---GND
VCC---3.3V
SCL---SCL
SDA---SDA

SHT20:

SSD1306:

树莓派引脚图：

二、树莓派开启I2C功能

参考1：SHT20温湿度采集

参考2：I2C接口的OLED在树莓派上的应用

1、使能I2C Kernel Module

远程登陆树莓派后，输入sudo raspi-config 后，选择5.Interfacing Options 选择P5 I2C 选择 是，如下图所示：

2、安装I2C-Tools

sudo apt-get install i2c-tools
sudo apt-get install python-smbus
sudo adduser pi i2c
sudo reboot

安装完成后输入i2cdetect -y 1，检查各个模块的地址

图中0x40是SHT20地址， 0x30是OLED屏幕的地址

三、本地温度显示

1、安装luma.oled的包

sudo apt-get install libfreetype6-dev libjpeg-dev build-essentia
sudo apt-get install python3-dev python3-pip
sudo -H pip3 install --upgrade luma.oled

注：目前已经不支持python3以下的版本更新了

2、点亮oled屏幕

运行oled2.py（python3运行）python3 oled2.py

# oled2.py
from luma.core.interface.serial import i2c, spi
from luma.core.render import canvas
from luma.oled.device import ssd1306, ssd1325, ssd1331, sh1106
import time
import socket
import fcntl
import struct

serial = i2c(port=1, address=0x3C)
oled = ssd1306(serial)


def getIP(ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(
        s.fileno(),
        0x8915,  # SIOCGIFADDR
        struct.pack('256s', ifname[:15].encode('utf-8'))
    )[20:24])


def oledIP():
    with canvas(oled) as draw:
        draw.text((2, 5), "IP: " + getIP("wlan0") + '\n' + "I'm working\nbut no people", fill=255)


def oledinit():
    serial = i2c(port=1, address=0x3C)
    oled = ssd1306(serial)


def oleddisplay(In, x, y):
    with canvas(oled) as draw:
        # draw.rectangle(device.bounding_box, outline="white", fill="black")
        draw.text((x, y), In, fill="white")

'''
if __name__ == "__main__":
    oledinit()
    # oledIP()
    In = "hello "
    oleddisplay(In, 15, 20)
    '''
oledinit()
while (1):

    oledIP()
    #In = "hello "
    oleddisplay(In, 15, 20)
    time.sleep(3)

显示效果：

3、本地温湿度检测

运行temp_local.py（python2.7运行）python temp_local

代码如下：

# temp_local.py
import smbus
import time

F8X16=										    \
(										    \
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,\
  0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\
  0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,\
  0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,\
  0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,\
  0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,\
  0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,\
  0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,\
  0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,\
  0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,\
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,\
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,\
  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,\
  0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,\
  0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,\
  0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,\
  0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,\
  0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,\
  0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,\
  0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,\
  0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,\
  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,\
  0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,\
  0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,\
  0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,\
  0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,\
  0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,\
  0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,\
  0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,\
  0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,\
  0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,\
  0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,\
  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,\
  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,\
  0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,\
  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,\
  0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,\
  0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,\
  0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,\
  0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,\
  0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,\
  0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,\
  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,\
  0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,\
  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,\
  0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,\
  0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,\
  0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,\
  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,\
  0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,\
  0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,\
  0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,\
  0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,\
  0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,\
  0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,\
  0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,\
  0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,\
  0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,\
  0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,\
  0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,\
  0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,\
  0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,\
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,\
  0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,\
  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,\
  0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,\
  0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,\
  0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,\
  0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,\
  0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,\
  0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,\
  0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,\
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,\
  0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,\
  0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,\
  0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,\
  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,\
  0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,\
  0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,\
  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,\
  0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,\
  0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,\
  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,\
  0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,\
  0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,\
  0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,\
  0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,\
  0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\
)

F_SIGN = (								      \
0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00, \
0x06,0x09,0x09,0xE6,0xF8,0x0C,0x04,0x02,0x02,0x02,0x02,0x02,0x04,0x1E,0x00,0x00,\
0x00,0x00,0x00,0x07,0x1F,0x30,0x20,0x40,0x40,0x40,0x40,0x40,0x20,0x10,0x00,0x00\
)

Hzk = 					\
[					\
[0x06,0x09,0x09,0xE6,0xF8,0x0C,0x04,0x02,0x02,0x02,0x02,0x02,0x04,0x1E,0x00,0x00],\
[0x00,0x00,0x00,0x07,0x1F,0x30,0x20,0x40,0x40,0x40,0x40,0x40,0x20,0x10,0x00,0x00],\
[0x10,0x60,0x02,0x8C,0x00,0x00,0xFE,0x92,0x92,0x92,0x92,0x92,0xFE,0x00,0x00,0x00],\
[0x04,0x04,0x7E,0x01,0x40,0x7E,0x42,0x42,0x7E,0x42,0x7E,0x42,0x42,0x7E,0x40,0x00],\
[0x00,0x00,0xFC,0x24,0x24,0x24,0xFC,0x25,0x26,0x24,0xFC,0x24,0x24,0x24,0x04,0x00],\
[0x40,0x30,0x8F,0x80,0x84,0x4C,0x55,0x25,0x25,0x25,0x55,0x4C,0x80,0x80,0x80,0x00],\
[0x10,0x60,0x02,0x8C,0x00,0xFE,0x92,0x92,0x92,0x92,0x92,0x92,0xFE,0x00,0x00,0x00],\
[0x04,0x04,0x7E,0x01,0x44,0x48,0x50,0x7F,0x40,0x40,0x7F,0x50,0x48,0x44,0x40,0x00],\
[0x00,0x00,0xFC,0x24,0x24,0x24,0xFC,0x25,0x26,0x24,0xFC,0x24,0x24,0x24,0x04,0x00],\
[0x40,0x30,0x8F,0x80,0x84,0x4C,0x55,0x25,0x25,0x25,0x55,0x4C,0x80,0x80,0x80,0x00],\
[0x00,0x00,0x7C,0x82,0x82,0x7C,0x00,0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x00,0x00],\
[0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,0x3E,0x41,0x41,0x3E,0x00,0x00,0x00,0x00],\
]

eSHT2xOled_Addressess = 0x40

eTempHoldCmd= 0xE3

eRHumidityHoldCmd= 0xE5

eTempNoHoldCmd= 0xF3

eRHumidityNoHoldCmd= 0xF5

writeUserRegister= 0xE6

readUserRegister= 0xE7

softReset= 0xFE

i2c = smbus.SMBus(1)

Oled_Address = 0x3C


def Clear_Oled():
	for i in range(8):
		i2c.write_byte_data(Oled_Address , 0x00, 0xB0 + i)
        	i2c.write_byte_data(Oled_Address , 0x00, 0x02)
        	i2c.write_byte_data(Oled_Address , 0x00, 0x10)
		for k in range(128):
            		i2c.write_byte_data(Oled_Address , 0x40, 0x00)
def On_Oled():
	for i in range(8):
		i2c.write_byte_data(Oled_Address , 0x00, 0xB0 + i)
        	i2c.write_byte_data(Oled_Address , 0x00, 0x02)
        	i2c.write_byte_data(Oled_Address , 0x00, 0x10)
		for k in range(128):
            		i2c.write_byte_data(Oled_Address , 0x40, 0xFF)

def OLED_Set_Pos(x, y):
	i2c.write_byte_data(Oled_Address, 0x00, 0xb0 + y)
	i2c.write_byte_data(Oled_Address, 0x00, ((x & 0xf0) >> 4) | 0x10)
	i2c.write_byte_data(Oled_Address, 0x00, (x & 0x0f) | 0x01)

def OLED_ShowChar(x, y, chr):
	c = chr - 0x20
	if (x > 128 - 1)  :
		x = 0
		y = y + 2
	OLED_Set_Pos(x, y)
	for i in range(8):
		i2c.write_byte_data(Oled_Address, 0x40, F8X16[c * 16 + i])
	OLED_Set_Pos(x, y + 1)
	for i in range(8):
		i2c.write_byte_data(Oled_Address, 0x40, F8X16[c * 16 + i + 8])

def OLED_ShowSign(x, y, c):
	if (x > 128 - 1)  :
		x = 0
		y = y + 2
	OLED_Set_Pos(x, y)
	for i in range(8):
		i2c.write_byte_data(Oled_Address, 0x40, F_SIGN[c * 16 + i])
	OLED_Set_Pos(x, y + 1)
	for i in range(8):
		i2c.write_byte_data(Oled_Address, 0x40, F_SIGN[c * 16 + i + 8])

def OLED_ShowString(x, y, chr):
	for j in range(len(chr)):
		OLED_ShowChar(x, y, ord(chr[j]))
		x += 8
		if (x > 120):
			x = 0
			y += 2

def OLED_ShowCHinese(x, y, no):
	OLED_Set_Pos(x, y)
	for t in range(16):
		i2c.write_byte_data(Oled_Address, 0x40, Hzk[2 * no][t])
	OLED_Set_Pos(x, y + 1)
	for t in range(16):
		i2c.write_byte_data(Oled_Address, 0x40, Hzk[2 * no + 1][t])

def readSensor(command):
	i2c.write_quick(eSHT2xOled_Addressess)
	i2c.write_byte(eSHT2xOled_Addressess,command)
	time.sleep(0.1)
	result =(i2c.read_byte(eSHT2xOled_Addressess)<<8)
	result += i2c.read_byte(eSHT2xOled_Addressess)
	result &= ~0x0003
	#print result
	return result

def getRHumidity():
	return (-6.0 + 125.0 / 65536.0 * float(readSensor(eRHumidityNoHoldCmd)))

def getTemperature():
	return (-46.85 + 175.72 / 65536.0 * float(readSensor(eTempNoHoldCmd)))

i2c.write_byte_data(Oled_Address,0x00,0xAE)
i2c.write_byte_data(Oled_Address,0x00,0x02)
i2c.write_byte_data(Oled_Address,0x00,0x10)
i2c.write_byte_data(Oled_Address,0x00,0x40)
i2c.write_byte_data(Oled_Address,0x00,0xB0)
i2c.write_byte_data(Oled_Address,0x00,0x81)
i2c.write_byte_data(Oled_Address,0x00,0xFF)
i2c.write_byte_data(Oled_Address,0x00,0xA1)
i2c.write_byte_data(Oled_Address,0x00,0xA6)
i2c.write_byte_data(Oled_Address,0x00,0xA8)
i2c.write_byte_data(Oled_Address,0x00,0x3F)
i2c.write_byte_data(Oled_Address,0x00,0xAD)
i2c.write_byte_data(Oled_Address,0x00,0x8B)
i2c.write_byte_data(Oled_Address,0x00,0x33)
i2c.write_byte_data(Oled_Address,0x00,0xC8)
i2c.write_byte_data(Oled_Address,0x00,0xD3)
i2c.write_byte_data(Oled_Address,0x00,0x00)

i2c.write_byte_data(Oled_Address,0x00,0xD5)
i2c.write_byte_data(Oled_Address,0x00,0x80)

i2c.write_byte_data(Oled_Address,0x00,0xD8)
i2c.write_byte_data(Oled_Address,0x00,0x05)

i2c.write_byte_data(Oled_Address,0x00,0xD9)
i2c.write_byte_data(Oled_Address,0x00,0x1F)

i2c.write_byte_data(Oled_Address,0x00,0xDB)
i2c.write_byte_data(Oled_Address,0x00,0x40)

i2c.write_byte_data(Oled_Address,0x00,0xAF)


Clear_Oled()


OLED_ShowCHinese(5,1,1)
OLED_ShowCHinese(22,1,2)
OLED_ShowString(40,1,":")
OLED_ShowCHinese(110,1,0)
OLED_ShowCHinese(5,4,3)
OLED_ShowCHinese(22,4,4)
OLED_ShowString(40,4,":")
OLED_ShowCHinese(110,4,5)

print "OLED Init"

i2c.write_byte(0x40, 0xFE)

print "SHT20 Init"

time.sleep(0.800)

while (1):
	H=getRHumidity()
	T=getTemperature()

	OLED_ShowString(60,1,str(round(T, 2)))
	OLED_ShowString(60,4,str(round(H, 2)))
	
	print "Temperature=%0.2f"%(T)
	print "Humidity=%0.2f"%(H)

	time.sleep(3)

运行效果：

四、ONENET云平台显示温湿度数据

参考3：实时检测温湿度教程

参考4：树莓派传输数据给OneNET（HTTP形式）

1、设置onenet云平台

1.1 创建HTTP协议产品

产品信息自己填，技术参数如下：

1.2 创建设备

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-HO368rnO-1591860948205)(树莓派学习笔记（四）——.assets/image-20200611151021054.png)]

填写你的设备信息（随意填），网站自动生成相关API地址等信息。

1.3 添加数据流

数据流的名称和程序中的数据名称要一致

我这里添加了 CPU温度、温度、湿度三个数据流

1.4 添加应用

在显示模块中选择相应数据流

2、运行ONENET示例程序

运行示例程序，将树莓派CPU温度上传到onenet平台显示。

注意：需要将APIKEY、url的设备号这两处代码修改成你自己的设备的相关编号。

python onenet.py

# -*- coding:utf-8 -*-
# File: onenet.py
# 向平台已经创建的数据流发送数据点
import urllib2
import json
import time
import datetime

APIKEY = 'xxxxxxx='  # 改成你的APIKEY


def get_temp():
    # 打开文件
    file = open("/sys/class/thermal/thermal_zone0/temp")
    # 读取结果，并转换为浮点数
    temp = float(file.read()) / 1000
    # 关闭文件
    file.close()
    # 向控制台打印结果
    print("CPU tempurature: %.3f" % temp)
    # 返回温度值
    return temp


def http_put():
    temperature = get_temp()  # 获取CPU温度并上传
    CurTime = datetime.datetime.now()

    # 这url只需把数字部分 xxxxxxx 换成你在onenet中创建的设备号就行
    url = 'http://api.heclouds.com/devices/xxxxxxxx/datapoints'

    #  onenet平台上显示的值
    values = {
        'datastreams': [{"id": "temperature", "datapoints": [{"time": CurTime.isoformat(), "value": temperature}]}]}


    print ("Cur_time:%s" % CurTime.isoformat())
    print ("tempure:%.3f" % temperature)

    jdata = json.dumps(values)  # 对数据进行JSON格式化编码
    # 打印json内容
    print jdata
    request = urllib2.Request(url, jdata)
    request.add_header('api-key', APIKEY)
    request.get_method = lambda: 'POST'  # 设置HTTP的访问方式
    request = urllib2.urlopen(request)
    return request.read()


while True:
    time.sleep(5)
    resp = http_put()
    print ("OneNET_result: %s" % resp)
    # time.sleep(5)

3、将本地温湿度数据同步至ONENET平台

将 onenet.py 的代码移植到temp_local.py中，得到程序：temp_onenet.py

python temp_onenet.py

代码在temperater程序中，需要的自行下载，同样也需要将APIKEY、url的设备号这两处代码修改成你自己的设备的相关编号。

显示效果：

树莓派学习笔记（四）——温湿度检测（本地OLED显示、ONENET云平台显示）

文章目录

前言

一、硬件连接

二、树莓派开启I2C功能

1、使能I2C Kernel Module

2、安装I2C-Tools

三、本地温度显示

1、安装luma.oled的包

2、点亮oled屏幕

3、本地温湿度检测

四、ONENET云平台显示温湿度数据

1、设置onenet云平台

1.1 创建HTTP协议产品

1.2 创建设备

1.3 添加数据流

1.4 添加应用

2、运行ONENET示例程序

3、将本地温湿度数据同步至ONENET平台

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樹莓派學習筆記（四）——溫溼度檢測（本地OLED顯示、ONENET雲平臺顯示）

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