shaun/pico-hcsr04
Archived
1
0
Fork 0
Code Issues 1 Activity

Moving to dotenv.

Browse Source
This commit is contained in:
Shaun Setlock
2025-04-26 21:30:47 -04:00
parent 6deaf17a6a
commit 790b82a602
1 changed files with 24 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
pico_funcs.py
View File

@@ -1,34 +1,39 @@
import machine
import network
import wifi_config
import time
import os
from dotenv import load_dotenv
'''
load_dotenv()
"""
pico_funcs: Helper functions for things the pico can do.
'''
"""
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.
So, we have to convert this value either to the Celsius degree scales.
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.
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.
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.
ref: https://how2electronics.com/read-temperature-sensor-value-from-raspberry-pi-pico/
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.
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.
ref: https://how2electronics.com/read-temperature-sensor-value-from-raspberry-pi-pico/
"""
cpu_temp_conversion_factor = 3.3 / 65535
cpu_temp_sensor = machine.ADC(4)
reading = cpu_temp_sensor.read_u16() * cpu_temp_conversion_factor
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
def wlan_up(wlan):
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
max_wait = 10
while max_wait > 0:
@@ -39,13 +44,14 @@ def wlan_up(wlan):
if max_wait == 0:
return None
ifconfig = wlan.ifconfig()
return ifconfig
def led_error_code(led, error_code: int):
"""Blink LED for a given error code (int). error code == number of times to blink"""
# Run a quick 'start error code sequence'
# So we know when LED error sequence starts
start_sequence_counter = 0
@@ -55,7 +61,7 @@ def led_error_code(led, error_code: int):
led.value(False)
time.sleep(0.1)
start_sequence_counter += 1
# Run real error code sequence
blink_counter = 0
while blink_counter < error_code:
@@ -65,4 +71,5 @@ def led_error_code(led, error_code: int):
led.value(False)
blink_counter += 1
# Make sure to turn off LED when this subroutine finished
led.value(False)
led.value(False)