1 files changed, 126 insertions, 0 deletions
diff --git a/firmware/main.py b/firmware/main.py
new file mode 100644
index 0000000..37ce957
--- /dev/null
+++ b/firmware/main.py
@@ -0,0 +1,126 @@
+import settings
+
+import sys
+from machine import Pin, I2C, WDT
+import network
+import time
+import struct
+
+import mqtt_as
+mqtt_as.MQTT_base.DEBUG = True
+
+
+from bme680 import *
+
+from homie.constants import FALSE, TRUE, BOOLEAN, FLOAT, STRING
+from homie.device import HomieDevice
+from homie.node import HomieNode
+from homie.property import HomieNodeProperty
+
+from uasyncio import get_event_loop, sleep_ms
+
+class BME680(HomieNode):
+
+    def __init__(self, name="bme680", device=None):
+        super().__init__(id="bme680", name=name, type="sensor")
+        self.wdt = WDT()
+        self.device = device
+        self.i2c = I2C(scl=Pin(5), sda=Pin(4))
+        self.bme680 = BME680_I2C(i2c=self.i2c)
+        self.temperature = HomieNodeProperty(
+            id="temperature",
+            name="temperature",
+            unit="°C",
+            settable=False,
+            datatype=FLOAT,
+            default=0,
+        )
+        self.add_property(self.temperature)
+        self.humidity = HomieNodeProperty(
+            id="humidity",
+            name="humidity",
+            unit="%",
+            settable=False,
+            datatype=FLOAT,
+            default=0,
+        )
+        self.add_property(self.humidity)
+        self.pressure = HomieNodeProperty(
+            id="pressure",
+            name="pressure",
+            unit="Pa",
+            settable=False,
+            datatype=FLOAT,
+            default=0,
+        )
+        self.add_property(self.pressure)
+        self.gas = HomieNodeProperty(
+            id="voc",
+            name="voc",
+            unit="ohm",
+            settable=False,
+            datatype=FLOAT,
+            default=0,
+        )
+        self.add_property(self.gas)
+        self.uptime = HomieNodeProperty(
+            id="uptime",
+            name="uptime",
+            settable=False,
+            datatype=STRING,
+            default="PT0S"
+        )
+        self.add_property(self.uptime)
+        loop = get_event_loop()
+        loop.create_task(self.update_data())
+        self.led = Pin(0, Pin.OUT)
+        self.online_led = Pin(12, Pin.OUT)
+        self.online_led.off()
+        self.last_online = time.time()
+        self.start = time.time()
+
+    async def update_data(self):
+        while True:
+            if self.device.mqtt.isconnected():
+                self.last_online = time.time()
+                self.online_led.on()
+                self.led.value(0)  # illuminate onboard LED
+                self.temperature.data = str(self.bme680.temperature)
+                self.humidity.data = str(self.bme680.humidity)
+                self.pressure.data = str(self.bme680.pressure)
+                self.gas.data = str(self.bme680.gas)
+                self.uptime.data = self.get_uptime()
+                self.led.value(1)  # onboard LED off
+                for _ in range(15):
+                    self.wdt.feed()
+                    await sleep_ms(1000)
+            else:
+                self.online_led.off()
+                if time.time() - self.last_online < 60:
+                    self.wdt.feed()
+                await sleep_ms(1000)
+
+    def get_uptime(self):
+        diff = int(time.time() - self.start)
+        out = "PT"
+        # hours
+        if diff // 3600:
+            out += str(diff // 3600) + "H"
+            diff %= 3600
+        # minutes
+        if diff // 60:
+            out += str(diff // 60) + "M"
+            diff %= 60
+        # seconds
+        out += str(diff) + "S"
+        return out
+
+def main():
+    # homie
+    print("homie main")
+    homie = HomieDevice(settings)
+    homie.add_node(BME680(device=homie))
+    homie.run_forever()
+
+if __name__ == "__main__":
+    main()