shaun/pico-hcsr04
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Moving to dotenv.

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Shaun Setlock
2025-04-26 21:30:47 -04:00
parent 6deaf17a6a
commit 790b82a602
1 changed files with 24 additions and 17 deletions
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41
pico_funcs.py
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@@ -1,34 +1,39 @@
import machine import machine
import network import network
import wifi_config
import time import time
import os
from dotenv import load_dotenv
''' load_dotenv()
"""
pico_funcs: Helper functions for things the pico can do. pico_funcs: Helper functions for things the pico can do.
''' """
def read_cpu_temp(): def read_cpu_temp():
""" """
If you print the value of the temperature value you are going to get an integer number between 0 and 65535. If you print the value of the temperature value you are going to get an integer number between 0 and 65535.
So, we have to convert this value either to the Celsius degree scales. So, we have to convert this value either to the Celsius degree scales.
The temperature sensor works by delivering a voltage to the ADC4 pin that is proportional to the temperature. The temperature sensor works by delivering a voltage to the ADC4 pin that is proportional to the temperature.
From the datasheet, a temperature of 27 degrees Celsius delivers a voltage of 0.706 V. From the datasheet, a temperature of 27 degrees Celsius delivers a voltage of 0.706 V.
With each additional degree the voltage reduces by 1.721 mV or 0.001721 V. With each additional degree the voltage reduces by 1.721 mV or 0.001721 V.
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. 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.
ref: https://how2electronics.com/read-temperature-sensor-value-from-raspberry-pi-pico/ ref: https://how2electronics.com/read-temperature-sensor-value-from-raspberry-pi-pico/
""" """
cpu_temp_conversion_factor = 3.3 / 65535 cpu_temp_conversion_factor = 3.3 / 65535
cpu_temp_sensor = machine.ADC(4) cpu_temp_sensor = machine.ADC(4)
reading = cpu_temp_sensor.read_u16() * cpu_temp_conversion_factor reading = cpu_temp_sensor.read_u16() * cpu_temp_conversion_factor
temperature_c = 27 - (reading - 0.706) / 0.001721 temperature_c = 27 - (reading - 0.706) / 0.001721
temperature_f = temperature_c * 9/5. + 32.0 temperature_f = temperature_c * 9 / 5.0 + 32.0
return temperature_f return temperature_f
def wlan_up(wlan): def wlan_up(wlan):
wlan.active(True) wlan.active(True)
wlan.connect(wifi_config.HOME_WIFI_SSID, wifi_config.HOME_WIFI_PWD) wlan.connect(os.getenv("HOME_WIFI_SSID"), os.getenv("HOME_WIFI_PWD"))
# Wait for connect or fail # Wait for connect or fail
max_wait = 10 max_wait = 10
while max_wait > 0: while max_wait > 0:
@@ -39,13 +44,14 @@ def wlan_up(wlan):
if max_wait == 0: if max_wait == 0:
return None return None
ifconfig = wlan.ifconfig() ifconfig = wlan.ifconfig()
return ifconfig return ifconfig
def led_error_code(led, error_code: int): def led_error_code(led, error_code: int):
"""Blink LED for a given error code (int). error code == number of times to blink""" """Blink LED for a given error code (int). error code == number of times to blink"""
# Run a quick 'start error code sequence' # Run a quick 'start error code sequence'
# So we know when LED error sequence starts # So we know when LED error sequence starts
start_sequence_counter = 0 start_sequence_counter = 0
@@ -55,7 +61,7 @@ def led_error_code(led, error_code: int):
led.value(False) led.value(False)
time.sleep(0.1) time.sleep(0.1)
start_sequence_counter += 1 start_sequence_counter += 1
# Run real error code sequence # Run real error code sequence
blink_counter = 0 blink_counter = 0
while blink_counter < error_code: while blink_counter < error_code:
@@ -65,4 +71,5 @@ def led_error_code(led, error_code: int):
led.value(False) led.value(False)
blink_counter += 1 blink_counter += 1
# Make sure to turn off LED when this subroutine finished # Make sure to turn off LED when this subroutine finished
led.value(False) led.value(False)