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I originally designed this project using a Raspberry Pi Model B, USB WiFi adapter two ACS712 current sensors and a MCP3008.
In less than a year the SD card became corrupt and stopped working. I have since discovered the Particle Photon so I'm re-designing the project again using the Photon in place of the Raspberry Pi.
3-26-2016LaundryWatchVersion2.docxSource Code Version 2.0document - 6.69 kB - 06/30/2016 at 21:15 |
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3-5-2016 Laundry Watch.gdocSource Code Version 1.0gdoc - 250.00 bytes - 03/06/2016 at 03:20 |
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I noticed the readings did fluctuate, but since my threshold limits for determining when the washer and dyer are on are pretty high and therefore fluctuations are not detected.
There are periods during the wash cycle on many washers where the clothes just soak. How do you plan to differentiate between this state and when the wash is done using current draw?
To account for this I have a 5 minute countdown that starts when no current is detected. If current is detected again within this countdown period the timer is reset. If the countdown reaches zero the alert is sent. When my washer is set for the largest laundry load it's current flow is idle for no more than 4 minutes. The countdown timer is how I account for this problem. The only downside to this approach is the notification is sent 5 minutes after the laundry is complete.
Ryan
Have you found your base "zero current" readings to be consistent? Mine have been consistently inconsistent. What I do now is every two hours, if the washer hasn't run, average out the last 90 readings (~1/min) and that becomes my new base value (off).