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In this lesson, we will show you how to send temperature information from Pico to I2C LCD screen.
I2C is a very popular protocol which can exchange data between computer(Master) and its external devices(Slave). A typical I2C slave device must a data pin(SDA) and a clock pin(SCL) which must be connected the SDA and SCL pin of Raspberry Pi Pico. One Pico SDA and SCL pin pair (BUS) can actually connect to multiple slave devices. Each slave device has a unique address ID by which Pico can find it by program.
In this project, we will use an I2C LCD display as slave device. We will use a Pico board internal temperature sensor to get temperature and display the data to I2C LCD display.
In above circuit graph, you can see that:
LCD VCC pin connected to Pico Vbus pin(5V)
LCD GND pin connected to Pico GND
LCD SDA pin connected to Pico SDA pin(GP0)
LCD SCL pin connected to Pico SCL pin(GP1)
In this lesson, we will use lcd_api and pico_i2c_lcd two Python library to access LCD. Please download the library zip file from https://osoyoo.com/driver/pico/pico_i2c_lcd.zip
Unzip above zip file, you will see two files: lcd_api.py and pico_i2c_lcd.py. Use Thonny to open each file and then save them to Pico root directory.
You can download lesson 4 python code from https://osoyoo.com/driver/pico/lesson4/pico-lesson4.py
You can use Thonny to open pico-lesson4.py and load it to Pico later.
Here is the full code with comments:
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(). #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()
Step 1: Connect Pico board to one of USB ports in your PC
Step 2: If you haven’t installed Thonny Software or don’t know how to use Thonny IDE, please read lesson 1
Step 3: Now open the Thonny Python IDE, click Run to select MicroPython for Rapsberry Pi Pico as Interpreter :
Also please select the COM port which your Pico board is connected :
After that, click OK to save the setting.
Step 4: Unzip file pico_i2c_lcd.zip ,you can see two files: lcd_api.py and pico_i2c_lcd.py. Use Thonny to open each file
and then save them to Pico root directory.
then click OK
Now you can see LCD shows:
Temperature: 25.01234 Cº
|1||Raspberry Pi Pico Board||https://osoyoo.store/products/raspberry-pi-pico-flexible-microcontroller-board-based-on-the-raspberry-pi-rp2040-dual-core-arm-cortex-m0-processor-1-pc?variant=39875307864175|
|3||Infrared Sensor Module||https://osoyoo.store/products/hc-sr501-pir-motion-sensor-for-arduino?variant=31957812838511|
|4||RFID Module and card||https://osoyoo.store/products/osoyoo-rfid-module?variant=31970646130799|
|5||Push Buttons and Hats||https://osoyoo.store/products/push-button-and-hats-5pcs?variant=39879253131375|
|6||LED(6 x White, 6 x Red, 6 x Yellow, 6x Green)||https://osoyoo.store/products/led-packs-for-arduino?variant=31957816442991|
|8||Piezo Buzzer Module||https://osoyoo.store/products/piezo-buzzer-module-1pcs?variant=39879251656815|
|9||I2C LCD Display(16×2)||https://osoyoo.store/products/i2c-lcd1602-display?variant=39875437101167|
|11||Solderless Prototype Breadboard||https://osoyoo.store/products/solderless-prototype-breadboard-1pcs?variant=39879255457903|
|12||Potentionmeter (10K adjustable resistor)||https://osoyoo.store/products/potentionmeter-10k-adjustable-resistor-3pcs?variant=39879281016943|
|13||40Pin M to M Jumper Wires||https://osoyoo.store/products/40pin-m-to-m-jumper-wires?variant=39879256539247|
|14||20Pin M to F Jumper wires 15cm||https://osoyoo.store/products/20pin-15cm-female-to-female-cable?variant=31930663305327|
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