Python版本的温湿度+Nokia5110 display（SPI）

前提需要把micropython的固件安装到系统中

安装micropython到esp8266中

本实验需要：

1. ESP8266（我的是Wemos D1)

2. DHT11

3. Nokia5110 LCD

连线：

DHT11 out --> D2(GPIO-016) (-接入GND，+接入3.3vcc)

Nokia 5110 LCD

用到的库：

GitHub - mcauser/micropython-pcd8544: MicroPython driver for Nokia 5110 PCD8544 84x48 LCD modules

 dht，micropython自带

上代码：

dht11.py

import dht
from machine import Pin
 
class DHT11():
    def __init__(self, pin=14):
        self.dht11 = dht.DHT11(Pin(16))
 
    def read_dht(self):
        self.dht11.measure()
        return [
            self.dht11.temperature(),
            self.dht11.humidity()
        ]

ampy -p /dev/ttyUSB0 dht11.py

ampy -p /dev/ttyUSB0 pcd8544.py

main.py

import time, ustruct
from machine import I2C, Pin, SPI
 
# Nokia 5110
import pcd8544, framebuf
 
# Temp sensor
import dht11
temp_pin = 16
dht = dht11.DHT11(temp_pin)
 
# Initialise SPI for display
spi = SPI(1, baudrate=80000000, polarity=0, phase=0)
ce = Pin(2)
dc = Pin(15)
rst = Pin(0)
 
# backlight on
bl = Pin(12, Pin.OUT, value=1)
 
lcd = pcd8544.PCD8544(spi, ce, dc, rst)
 
# Initialise framebuffer for display
buffer = bytearray((lcd.height // 8) * lcd.width)
framebuf = framebuf.FrameBuffer1(buffer, lcd.width, lcd.height)
 
# Update display
while(True):
	temp, humi = dht.read_dht()
	framebuf.fill(0)
	framebuf.text("DHT11 Temp Humi", 0, 0, 1)
	framebuf.text("Temp", 0, 11, 1)
	framebuf.text("%.1f" % temp, 0, 20, 1)
	framebuf.text("Humidity", 0, 31, 1)
	framebuf.text("%.1f" % humi, 0, 40, 1)
	lcd.data(buffer)
	time.sleep_ms(4000)