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| 1 | import time | |
| 2 | import RPi.GPIO as GPIO | |
| 3 | GPIO.setmode(GPIO.BCM) | |
| 4 | ||
| 5 | GPIO.setup(26, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) | |
| 6 | ||
| 7 | i = 0 | |
| 8 | ||
| 9 | start = time.time() | |
| 10 | ||
| 11 | - | while time.time() - start < 60: |
| 11 | + | while time.time() - start < 60: # sample for 1 minute |
| 12 | GPIO.wait_for_edge(26, GPIO.FALLING) | |
| 13 | i += 1 | |
| 14 | ||
| 15 | - | watts = i*3600.0/10.0 |
| 15 | + | # 10000 impulses per hour @ 1kW |
| 16 | # = 10 impulses per hour @ 1W | |
| 17 | # i = watts * 10 / hours | |
| 18 | # 1 minute = 1/60 hours | |
| 19 | # i = watts * 10 / (1/60) | |
| 20 | ||
| 21 | watts = i * 60.0 / 10.0 | |
| 22 | ||
| 23 | print watts, "Watts" | |
| 24 | ||
| 25 | GPIO.cleanup() |
