instant (kind of) whole house power display

scottorious · 04-23-13, 09:59 PM

So I have recently fallen in love with micro controllers, especially picaxe and I have built a device that counts the infrared pulses from my digital meter and does a calculation and then displays that result every 15 seconds. Each pulse from the meter is supposedly supposed to tell me that I used one watt hour so. I am working on making it wireless to be more convenient but thus far its pretty slick. I just figured out a way to data log onto my computer also so I can graph a days worth of data to see if I can figure out where I can cut. If anyone is interested I can go into more detail or share the circuit and coding for all of it.

ELGo · 04-24-13, 01:26 AM

Quote:

Originally Posted by scottorious

So I have recently fallen in love with micro controllers, especially picaxe and I have built a device that counts the infrared pulses from my digital meter and does a calculation and then displays that result every 15 seconds. Each pulse from the meter is supposedly supposed to tell me that I used one watt hour so. I am working on making it wireless to be more convenient but thus far its pretty slick. I just figured out a way to data log onto my computer also so I can graph a days worth of data to see if I can figure out where I can cut. If anyone is interested I can go into more detail or share the circuit and coding for all of it.

Lucky you -- I wish I had some ability with electronics.

If I am understanding you correctly, your calculation for watts will be
3600*pulses/15.
That leaves quite a range for error. You might be better off counting pulses for say two minutes at a time.

scottorious · 04-24-13, 08:02 AM

the equation I'm using is pulses*240 which is the same result as your equation. seems like it hasn't missed a pulse yet I have stood next to it with my video camera and night shot to make sure it does not miss one. I have thought about going out to two minutes or even five.

MN Renovator · 04-24-13, 08:09 AM

This same principle is used by devices such as the Black and Decker power monitor. I used to use one and it would update every 30 seconds to a minute depending on its mood and would display 300 watts minimum(often rounding up or bouncing between 300 and 0 with each update) but the kwh count remained accurate to the meter. My meter is a dial instead of a digital but the device handles both.

Just in case you need any ideas, you could look at that to see what features you might want.

04-23-13, 09:59 PM	#1
scottorious Helper EcoRenovator Join Date: Nov 2011 Location: bloomington IL Posts: 46 Thanks: 0 Thanked 1 Time in 1 Post	instant (kind of) whole house power display So I have recently fallen in love with micro controllers, especially picaxe and I have built a device that counts the infrared pulses from my digital meter and does a calculation and then displays that result every 15 seconds. Each pulse from the meter is supposedly supposed to tell me that I used one watt hour so. I am working on making it wireless to be more convenient but thus far its pretty slick. I just figured out a way to data log onto my computer also so I can graph a days worth of data to see if I can figure out where I can cut. If anyone is interested I can go into more detail or share the circuit and coding for all of it.

04-24-13, 08:02 AM	#3
scottorious Helper EcoRenovator Join Date: Nov 2011 Location: bloomington IL Posts: 46 Thanks: 0 Thanked 1 Time in 1 Post	the equation I'm using is pulses*240 which is the same result as your equation. seems like it hasn't missed a pulse yet I have stood next to it with my video camera and night shot to make sure it does not miss one. I have thought about going out to two minutes or even five.

04-24-13, 08:09 AM	#4
MN Renovator Less usage=Cheaper bills Join Date: Nov 2010 Location: Minneapolis, MN Posts: 940 Thanks: 41 Thanked 117 Times in 91 Posts	This same principle is used by devices such as the Black and Decker power monitor. I used to use one and it would update every 30 seconds to a minute depending on its mood and would display 300 watts minimum(often rounding up or bouncing between 300 and 0 with each update) but the kwh count remained accurate to the meter. My meter is a dial instead of a digital but the device handles both. Just in case you need any ideas, you could look at that to see what features you might want.