76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
import machine
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import network
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import time
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import os
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from dotenv import load_dotenv
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load_dotenv()
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"""
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pico_funcs: Helper functions for things the pico can do.
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"""
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def read_cpu_temp():
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"""
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If you print the value of the temperature value you are going to get an integer number between 0 and 65535.
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So, we have to convert this value either to the Celsius degree scales.
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The temperature sensor works by delivering a voltage to the ADC4 pin that is proportional to the temperature.
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From the datasheet, a temperature of 27 degrees Celsius delivers a voltage of 0.706 V.
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With each additional degree the voltage reduces by 1.721 mV or 0.001721 V.
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The first step in converting the 16-bit temperature is to convert it back to volts, which is done based on the 3.3 V maximum voltage used by the Pico board.
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ref: https://how2electronics.com/read-temperature-sensor-value-from-raspberry-pi-pico/
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"""
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cpu_temp_conversion_factor = 3.3 / 65535
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cpu_temp_sensor = machine.ADC(4)
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reading = cpu_temp_sensor.read_u16() * cpu_temp_conversion_factor
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temperature_c = 27 - (reading - 0.706) / 0.001721
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temperature_f = temperature_c * 9 / 5.0 + 32.0
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return temperature_f
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def wlan_up(wlan):
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wlan.active(True)
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wlan.connect(os.getenv("HOME_WIFI_SSID"), os.getenv("HOME_WIFI_PWD"))
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# Wait for connect or fail
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max_wait = 10
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while max_wait > 0:
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if wlan.status() < 0 or wlan.status() >= 3:
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break
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max_wait -= 1
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time.sleep(1)
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if max_wait == 0:
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return None
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ifconfig = wlan.ifconfig()
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return ifconfig
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def led_error_code(led, error_code: int):
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"""Blink LED for a given error code (int). error code == number of times to blink"""
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# Run a quick 'start error code sequence'
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# So we know when LED error sequence starts
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start_sequence_counter = 0
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while start_sequence_counter < 3:
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led.value(True)
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time.sleep(0.1)
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led.value(False)
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time.sleep(0.1)
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start_sequence_counter += 1
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# Run real error code sequence
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blink_counter = 0
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while blink_counter < error_code:
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time.sleep(1)
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led.value(True)
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time.sleep(1)
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led.value(False)
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blink_counter += 1
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# Make sure to turn off LED when this subroutine finished
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led.value(False)
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