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# This example takes the temperature from the Pico's onboard temperature sensor, and displays it on Pico Explorer, along with a little pixelly graph.
# It's based on the thermometer example in the "Getting Started with MicroPython on the Raspberry Pi Pico" book, which is a great read if you're a beginner!
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import machine
import utime
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# Pico Explorer boilerplate
import picoexplorer as display
width = display . get_width ( )
height = display . get_height ( )
display_buffer = bytearray ( width * height * 2 )
display . init ( display_buffer )
# reads from Pico's temp sensor and converts it into a more manageable number
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sensor_temp = machine . ADC ( 4 )
conversion_factor = 3.3 / ( 65535 )
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i = 0
while True :
# the following two lines do some maths to convert the number from the temp sensor into celsius
reading = sensor_temp . read_u16 ( ) * conversion_factor
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temperature = round ( 27 - ( reading - 0.706 ) / 0.001721 )
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# this if statement clears the display once the graph reaches the right hand side of the display
if i > = ( width + 1 ) :
i = 0
display . set_pen ( 0 , 0 , 0 )
display . clear ( )
# chooses a pen colour based on the temperature
display . set_pen ( 0 , 255 , 0 )
if temperature > 20 :
display . set_pen ( 255 , 0 , 0 )
if temperature < 13 :
display . set_pen ( 0 , 0 , 255 )
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# draws the reading as a tall, thin rectangle
display . rectangle ( i , height - ( temperature * 6 ) , 6 , height )
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# draws a white background for the text
display . set_pen ( 255 , 255 , 255 )
display . rectangle ( 1 , 1 , 65 , 33 )
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# writes the reading as text in the white rectangle
display . set_pen ( 0 , 0 , 0 )
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display . text ( " {:.0f} " . format ( temperature ) + " c " , 3 , 3 , 0 , 4 )
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# time to update the display
display . update ( )
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# waits for 5 seconds
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utime . sleep ( 5 )
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# the next tall thin rectangle needs to be drawn 6 pixels to the right of the last one
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i + = 6