shaun/pico-dht22
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Debugged code to be more reliable.

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This commit is contained in:
Shaun Setlock
2022-11-14 22:30:18 -05:00
parent 84b9df2728
commit 8fdcb51c08
1 changed files with 37 additions and 101 deletions
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138
main.py
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@@ -27,25 +27,10 @@ def read_cpu_temp():
cpu_temp_sensor = machine.ADC(4)
reading = cpu_temp_sensor.read_u16() * cpu_temp_conversion_factor
temperature_c = 27 - (reading - 0.706) / 0.001721
return temperature_c
temperature_f = temperature_c * 9/5. + 32.0
return temperature_f
def read_vsys():
# Set pin 29 for the voltage reading
# Note, this will break Wi-Fi until the pin is set back to original state
# See lines below where the state is reset
Pin(29, Pin.IN)
Vsys = machine.ADC(3)
conversion_factor = 3.3 * 3 / 65535
reading = Vsys.read_u16() * conversion_factor
# Reset pin back to the original state
# This original state is found by printing the value of the pin at the start of this function
# alt=7 seems to be Wi-Fi related, so
Pin(29, Pin.ALT, Pin.PULL_DOWN, alt=7)
return reading
def read_dht_22_raw(sensor):
def read_dht_22(sensor):
"""
reads the temperature and humidity from dht.DHT22 sensor.
returns tuple(temperature, humidity) if no errors
@@ -56,73 +41,28 @@ def read_dht_22_raw(sensor):
temperature = sensor.temperature()
humidity = sensor.humidity()
return temperature, humidity
except OSError:
return None
def read_dht_22_with_retry(sensor):
"""Same as [read_dht_22_raw] but tries a few times before giving up. Same returns as [read_dht_22_raw]"""
count = 0
while count < 2:
reading = read_dht_22_raw(sensor)
count += 1
if reading is not None:
return reading
except:
time.sleep(2)
return None
def read_dht_22(sensor):
"""
When DHT22 runs on 3.3v sometimes the output results are incomplete, at least what I've seen before
i.e it can return 2deg, 0deg for a measurement, and the normal readings
This is a hack to see if this solves this problem, we take 2 measurements and if they are not same (or close), discard
"""
reading_1 = read_dht_22_with_retry(sensor)
if reading_1 is None:
print("read_dht_22, reading 1 is None. Abort")
return None
# print("Reading 1: {}".format(reading_1))
time.sleep(2)
reading_2 = read_dht_22_with_retry(sensor)
if reading_2 is None:
print("read_dht_22, reading 2 is None. Abort")
return None
# print("Reading 2: {}".format(reading_2))
diff = abs(reading_1[0] - reading_2[0])
#print("Reading between 1 and 2 is {}".format(diff))
if diff > 2:
print("Reading between 1 and 2 is more than 2 deg apart, {}".format(diff))
return None
return reading_1
def wlan_up(wlan):
print("Connoting to Wifi...")
wlan.active(True)
print("Wifi chip is active ... wlan.connect now")
wlan.connect(wifi_config.HOME_WIFI_SSID, wifi_config.HOME_WIFI_PWD)
print("wlan.connect is done")
# Wait for connect or fail
max_wait = 10
while max_wait > 0:
if wlan.status() < 0 or wlan.status() >= 3:
break
max_wait -= 1
print('waiting for connection...')
time.sleep(1)
max_wait -= 1
print('Waiting for WiFi connection...')
time.sleep(1)
if wlan.status() != 3:
raise RuntimeError('network connection failed, {}'.format(wlan.status()))
if max_wait == 0:
return None
ifconfig = wlan.ifconfig()
print(ifconfig)
print("Connected to Wifi")
return ifconfig
def led_error_code(led, error_code: int):
@@ -154,6 +94,7 @@ def led_error_code(led, error_code: int):
def main():
print("Start up")
count = 0
# Set Wi-Fi Country
rp2.country('US')
@@ -171,28 +112,33 @@ def main():
print("Enter main loop")
while True:
led.value(False)
# Read vsys before doing any WiFi connections makes the board more stable over long runs
vsys_volts = read_vsys()
try:
ifconfig = wlan_up(wlan)
except Exception as e:
print("Trouble to connecting WiFi: {}".format(e))
# Should we raise a problem vs just try it again ?
# raise RuntimeError('Trouble to connecting WiFi, {}'.format(e))
led_error_code(led, 3)
continue
count += 1
print(f'\nStarting loop #{count}... \nWiFI Status is {wlan.status()}.')
if wlan.status() != 3:
ifconfig = wlan_up(wlan)
if ifconfig is None:
print("Trouble to connecting WiFi: {}".format(e))
led_error_code(led, 3)
continue
else:
print("Connected to WiFi: {}".format(ifconfig))
else:
ifconfig = wlan.ifconfig()
print(f"Skipping WiFi Activation since WiFi Status is {wlan.status()} \n{ifconfig}.")
try:
mqtt_client.connect()
print("Connected to MQTT")
print(f'MQTT Connected.')
except Exception as e:
print("Trouble to connecting to MQTT: {}".format(e))
# Should we raise a problem vs just try it again ?
# raise RuntimeError('Trouble to connecting to MQTT, {}'.format(e))
led_error_code(led, 2)
continue
continue
dht22_reading = read_dht_22(sensor)
debug_str = "None"
@@ -201,31 +147,21 @@ def main():
temp = temp * 9/5. + 32.0
mqtt_client.publish("m/v1/home/{}/0/temperature".format(mqtt_config.MQTT_ZONE_ID), "DHT22 Temp = {} degF".format(str(temp)), retain=True)
mqtt_client.publish("m/v1/home/{}/0/humidity".format(mqtt_config.MQTT_ZONE_ID), "DHT22 %Hum = {} %".format(str(hum)), retain=True)
debug_str = "{} ; {}".format(temp, hum,)
debug_str = "{} ; {}".format(temp, hum)
cpu_temp = read_cpu_temp()
cpu_temp = cpu_temp * 9/5. +32.0
print("{} ; CPU: {} ; Vsys: {}".format(debug_str, cpu_temp, vsys_volts))
print("{} ; CPU: {}".format(debug_str, cpu_temp))
# HW Info
mqtt_client.publish("m/v1/hw/{}/cpu/temperature".format(mqtt_config.MQTT_HW_ID), "CPU Temp = {} degF".format(str(cpu_temp)), retain=True)
mqtt_client.publish("m/v1/hw/{}/vsys/voltage".format(mqtt_config.MQTT_HW_ID), "CPU Voltage = {} V".format(str(vsys_volts)), retain=True)
mqtt_client.publish("m/v1/hw/{}/wlan/info".format(mqtt_config.MQTT_HW_ID), str(ifconfig), retain=True)
print("Killing the MQTT Connection")
mqtt_client.disconnect()
print("Going sleep ...")
time.sleep(1)
# Prep HW for sleep
wlan.disconnect()
wlan.active(False)
wlan.deinit()
machine.lightsleep(5000)
print("Woke up ...")
print(f'MQTT Disconnected.')
# Sleep for a bit.
print(f'Finished loop #{count}.')
time.sleep(5)
print('Start/Woke, reset clause {}'.format(machine.reset_cause()))
main()