Initial commit.

.gitignore

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+# ---> Python
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
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+.installed.cfg
+*.egg
+MANIFEST
+
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+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
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+*.spec
+
+# Installer logs
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+
+# Unit test / coverage reports
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+.coverage.*
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+coverage.xml
+*.cover
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+.hypothesis/
+.pytest_cache/
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+
+# Translations
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+
+# Django stuff:
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+
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+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
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+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
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+__pypackages__/
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+celerybeat-schedule
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+# Cython debug symbols
+cython_debug/
+

LICENSE

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+MIT License
+
+Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# PicoW DHT22
+> PicoW with DHT22 attached.
+
+#### Features:
+- Measure current temperature & humidity with DHT22 Sensor
+- Measure & Report VSYS
+- Measure & Report CPU Temp
+
+### Use
+- Install packages ...
+```
+import network
+wlan = network.WLAN(network.STA_IF)
+wlan.active(True)
+wlan.connect("Wi-Fi AP", "PASSWORD")
+
+import upip
+upip.install('umqtt.simple')
+upip.install('umqtt.robust')
+```
+- Upload files onto PICO, adjust params (such as Wi-Fi Credentials // pins // etc ), deploy to your PICO W 

main.py

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+import network
+import rp2
+import time
+import json
+import machine
+from machine import Pin
+from umqtt.robust import MQTTClient
+import dht
+import urequests
+import wifi_config
+import mqtt_config
+
+# Change this GPIO PIN where your DHT22 sensor is connected
+DHT_22_GPIO_PIN = 3
+
+# Debug Mode
+DEBUG = False
+
+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.
+
+        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
+    return temperature_f
+
+def read_dht_22(sensor):
+    """
+        reads the temperature and humidity from dht.DHT22 sensor.
+        returns tuple(temperature, humidity) if no errors
+        returns None if there was an error
+    """
+    try:
+        sensor.measure()
+        temperature = sensor.temperature()
+        humidity = sensor.humidity()
+        return temperature, humidity
+    except:
+        time.sleep(2)
+        return None
+
+def wlan_up(wlan):
+    wlan.active(True)
+    wlan.connect(wifi_config.HOME_WIFI_SSID, wifi_config.HOME_WIFI_PWD)
+    
+    # Wait for connect or fail
+    max_wait = 10
+    while max_wait > 0:
+        if wlan.status() < 0 or wlan.status() >= 3:
+            break
+        max_wait -= 1
+        if DEBUG:
+            print('Waiting for WiFi connection...')
+        time.sleep(1)
+
+    if max_wait == 0:
+        return None
+    
+    ifconfig = wlan.ifconfig()
+    if DEBUG:
+        print(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"""
+    if DEBUG:
+        print("LED Error Status code: {}".format(error_code))
+    
+    # Run a quick 'start error code sequence'
+    # So we know when LED error sequence starts
+    start_sequence_counter = 0
+    while start_sequence_counter < 3:
+        led.value(True)
+        time.sleep(0.1)
+        led.value(False)
+        time.sleep(0.1)
+        start_sequence_counter += 1
+    
+    # Run real error code sequence
+    blink_counter = 0
+    while blink_counter < error_code:
+        time.sleep(1)
+        led.value(True)
+        time.sleep(1)
+        led.value(False)
+        blink_counter += 1
+    # Make sure to turn off LED when this subroutine finished
+    led.value(False)
+    if DEBUG:
+        print("LED Error Status code finished for: {}".format(error_code))
+    
+    
+def main():
+
+    # Start Up Activities
+    if DEBUG:
+        print("Start up")
+    count = 0
+    led = machine.Pin('LED', machine.Pin.OUT)
+    led.value(False)
+    led_error_code(led, 1)
+
+    # Set Wi-Fi Country
+    rp2.country('US')
+    wlan = network.WLAN(network.STA_IF)
+    
+    # Create MQTT Client
+    mqtt_client = MQTTClient(
+        client_id = mqtt_config.MQTT_CLIENT_ID,
+        server = mqtt_config.MQTT_HOST_NAME,
+        )
+
+    # Create DHT22
+    sensor = dht.DHT22(Pin(DHT_22_GPIO_PIN))
+    
+    # Let's Go!
+    if DEBUG:
+        print("Enter main loop")
+
+    while True:
+
+        # Loop Clean-Up and Prep
+        led.value(False)
+        count += 1
+        if DEBUG:
+            print(f'\nStarting loop #{count}... \nWiFI Status is {wlan.status()}.')
+        
+        # Create Local Flags for Control
+        wifi_ready = False
+        mqtt_ready = False
+        dht22_ready = False
+
+        # DHT22 and CPU Reading.
+        try:
+            # CPU Reading.
+            cpu_temp = read_cpu_temp()
+
+            # DHT22 Reading.
+            dht22_reading = read_dht_22(sensor)
+            #debug_str = "None"
+            if dht22_reading is not None:
+                temp,hum = dht22_reading
+                temp = temp * 9/5. + 32.0
+                dht22_ready = True
+        except:
+            continue
+
+        # WiFi Connection.
+        try:
+            if wlan.status() != 3:
+                ifconfig = wlan_up(wlan)
+                if ifconfig is None:
+                    if DEBUG:
+                        print("Trouble to connecting WiFi: {}".format(e))
+                    led_error_code(led, 3)
+                    time.sleep(10)
+                    continue
+                else:
+                    wifi_ready = True
+                    if DEBUG:
+                        print("Connected to WiFi: {}".format(ifconfig))
+            else:
+                wifi_ready = True
+                ifconfig = wlan.ifconfig()
+                if DEBUG:
+                    print(f"Skipping WiFi Activation since WiFi Status is {wlan.status()} \n{ifconfig}.")
+        except:
+            continue
+
+        # MQTT Conneciton.
+        try:
+            try:
+                mqtt_client.connect(clean_session = False)
+                mqtt_ready = True
+                if DEBUG:
+                    print(f'MQTT Connected.')
+            
+            except Exception as e:
+                if DEBUG:
+                    print("Trouble to connecting to MQTT: {}".format(e))
+                led_error_code(led, 2)
+                time.sleep(5)
+                continue # Start back at the top of the While Loop        
+        except:
+            continue
+
+        # Ready to Publish?
+        try:
+            if wifi_ready and mqtt_ready and dht22_ready:
+                # Timestamp
+                time_now = time.localtime()
+                timestamp = "{}/{}/{} {}:{}:{}".format(time_now[1],time_now[2],time_now[0],time_now[3],time_now[4],time_now[5])
+                
+                # Build JSON Payloads
+                dht_data = {
+                    'Location':mqtt_config.MQTT_ZONE_ID,
+                    'Temperature':temp,
+                    'Relative Humidity':hum,
+                }
+                dht_payload = json.dumps(dht_data)
+                
+                hw_data = {
+                    'Timestamp':timestamp,
+                    'CPU Temperature':cpu_temp,
+                    'Device':mqtt_config.MQTT_HW_ID,
+                    'WiFi Information':ifconfig,
+                }
+                hw_payload = json.dumps(hw_data)
+                
+                # Publish
+                mqtt_client.publish("home/{}".format(mqtt_config.MQTT_ZONE_ID),dht_payload, retain=True)
+                mqtt_client.publish("hw/{}".format(mqtt_config.MQTT_HW_ID),hw_payload, retain=True)
+        
+                mqtt_client.disconnect()
+                if DEBUG:
+                    print(f'MQTT Disconnected.')
+
+        except:
+            continue
+
+        # Sleep for a bit.
+        if DEBUG:
+            print(f'Finished loop #{count}.')
+        time.sleep(5)
+
+main()