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tasmaprs.py

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+#!/usr/bin/env python3
+
+"""
+This script does the following:
+ * gets temperature and humidity from two connected DHT22 sensors
+ * gets the energy gain of a PV system via an intermediate Tasmota smart plug
+ * sends an APRS message containing the gathered information to APRS-IS
+"""
+
+import requests
+import aprslib
+import Adafruit_DHT
+
+TASMOTA_IP = "192.168.1.100" # change to IP address of Tasmota device
+DHT_SENSOR = Adafruit_DHT.DHT22
+SENSOR_RACK = 27 # change to corresponding GIO Pin
+SENSOR_OUTSIDE = 17 # change to corresponding GIO Pin
+APRS_SYMBOL = "-" # pick your APRS symbol here
+CALL = "XXXXX-15" # enter your call sign
+PASSWORD = "12345" # generate a passcode for your call and enter it here
+PORT = 14580 # should be okay
+GPS_COORDINATES = "585.36N/04041.46W" # enter your coordinates here
+
+
+def get_energy_data():
+    """grabs data from the Tasmota smart plug via HTTP request"""
+    resp = requests.get(url="http://{}/cm?cmnd=STATUS+8".format(TASMOTA_IP))
+    data = resp.json()
+    energy = data["StatusSNS"]["ENERGY"]
+    # Balkonkraftwerke (certain small PV systems) only generate 600W...
+    if energy["Power"] > 600:
+        energy["Power"] = 600
+    energy["Total"] = str(format(energy["Total"], '.1f'))
+    energy["Yesterday"] = str(format(energy["Yesterday"], '.1f'))
+    energy["Today"] = str(format(energy["Today"], '.1f'))
+    return energy
+
+
+def send_aprs(weather_data, energy_data):
+    """sends the APRS message to APRS-IS"""
+    # a valid passcode for the callsign is required in order to send
+    ais = aprslib.IS(CALL, passwd=PASSWORD, port=PORT)
+    ais.connect()
+    # send a single status message
+    msg = "PV Power:{} W, Today:{} kWh, Yesterday:{} kWh, Total:{} kWh - {}".format(\
+           energy_data["Power"], energy_data["Today"], energy_data["Yesterday"], \
+           energy_data["Total"], weather_data)
+    print(msg)
+    ais.sendall("DK1MI-15>APRS,TCPIP*:={}{} {}".format(GPS_COORDINATES, APRS_SYMBOL, msg))
+    ais.sendall("DK1MI-15>APRS,TCPIP*:>")
+
+
+def get_weather_data():
+    """grabs temperature and humidity from the attached DHT22 sensors"""
+    humidity_rack, temperature_rack = Adafruit_DHT.read_retry(DHT_SENSOR, SENSOR_RACK)
+    humidity_outside, temperature_outside = Adafruit_DHT.read_retry(DHT_SENSOR, SENSOR_OUTSIDE)
+    ret_val = "WX: "
+    if humidity_rack is not None and temperature_rack is not None:
+        ret_val = ret_val + "Rack:{0:0.1f}C/{1:0.1f}%".format(\
+                temperature_rack, humidity_rack)
+    else:
+        print("Failed to retrieve data from rack sensor")
+    if humidity_outside is not None and temperature_outside is not None:
+        ret_val = ret_val + " Outside:{0:0.1f}C/{1:0.1f}%".format(\
+                temperature_outside, humidity_outside)
+    else:
+        print("Failed to retrieve data from outside sensor")
+    return ret_val
+
+
+if __name__ == "__main__":
+    send_aprs(get_weather_data(), get_energy_data())