I2Cは、コンピューター（マスター）と外部デバイス（スレーブ）の間でデータをやりとりできる非常にポピュラーなプロトコルです。典型的なI2Cスレーブデバイスには、データピン（SDA）とクロックピン（SCL）が必要で、これらはRaspberry Pi PicoのSDAとSCLピンに接続する必要があります。1つのPico SDAとSCLピンペア（BUS）は、実際に複数のスレーブデバイスに接続できます。各スレーブデバイスには、Picoがプログラム内でそれを見つけるためのユニークなアドレスIDがあります。
from machine import I2C,Pin,ADC #import libraries to handle Pins, I2C and ADC
from time import sleep
from pico_i2c_lcd import I2cLcd #import library to handle I2C LCD
sensor_temp = ADC(4) #Internal Temperature sensor is connected to ADC 4
conversion_factor = 3.3/65535
def get_temperature(): #get temperature value from ADC 4 internal sensor
reading = sensor_temp.read_u16() * conversion_factor
temperature = 27 - (reading - 0.706)/0.001721
return temperature
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000) #initialize I2C port
I2C_ADDR = i2c.scan()[0]. #get I2C address
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16) #initialize I2C display as 2x16
degree = bytearray([0x1c,0x14,0x1c,0x00,0x00,0x00,0x00,0x00]) #define a customized LCD icon for º (degree sign)
lcd.custom_char(0, degree) #degree sign 'º' will be used as chr(0) in program
while True:
lcd.putstr("Temperature:\n"+str(get_temperature())+" C"+chr(0)) #display temperature to LCD
sleep(4)
lcd.clear()
I can’t get to write in the LCD. My code is the same as the one in this page (lesson4 for raspberry pi pico in micropython), but nothing happens. I use some fuctions to interact with de LCD like backlight_on() or backlight_off() and it works, but when I use putstr() it doesn’t work.
Then make sure there is no error message when you run the Python code. If you have any error message, please show us the error message. Or you can send the screenshot of error message to [email protected]
I can’t get to write in the LCD. My code is the same as the one in this page (lesson4 for raspberry pi pico in micropython), but nothing happens. I use some fuctions to interact with de LCD like backlight_on() or backlight_off() and it works, but when I use putstr() it doesn’t work.
¿Can you help me please?
firstly, please make sure you have properly adjust the brightness through the little screw in the back of LCD,
check this picture
https://osoyoo.com/wp-content/uploads/2017/05/LACC200602-6.jpg
Then make sure there is no error message when you run the Python code. If you have any error message, please show us the error message. Or you can send the screenshot of error message to [email protected]
It was about the brightness, excuse my clumsiness.
Thanks!