added script for collecting impulses and sending it to api, also included sample systemd service

powermeter.py

@@ -0,0 +1,25 @@
+#!/usr/bin/python3
+import RPi.GPIO as GPIO
+import time
+import datetime
+import requests
+ 
+SENSOR_PIN = 27
+ 
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(SENSOR_PIN, GPIO.IN)
+ 
+seconds = 0
+
+def callback(channel):
+    print(str(datetime.datetime.now()) + ' Impulse detected')
+    url = 'http://powermeter.local/impulses'
+    requests.post(url, json = {'power': 2})
+
+try:
+    GPIO.add_event_detect(SENSOR_PIN , GPIO.RISING, callback=callback, bouncetime=500)
+    while True:
+        time.sleep(1)
+except KeyboardInterrupt:
+    print("Exiting...")
+GPIO.cleanup()

powermeter.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=PowerMeter Service
+
+[Service]
+Type=simple
+User=root
+ExecStart=/usr/local/bin/powermeter.py
+Restart=always
+RestartSec=30
+
+[Install]
+WantedBy=multi-user.target
+