Hi, Just built tweet-a-watt and I'm getting readings that are out of line with the panel reading on the kill-a-watt (by a lot). Do I have a wiring problem?
It was doing this with the script unmodified, so I tried the calibration method mentioned in teh webpage. I change vrefcalibration to 486 as it seemed to be the most common amp sample.
vrefcalibration = [486, # Calibration for sensor #0
486, # Calibration for sensor #1
489, # Calibration for sensor #2
492, # Calibration for sensor #3
501, # Calibration for sensor #4
493] # etc... approx ((2.4v * (10Ko/14.7Ko)) / 3
It goes up and down, but is all a lot more than I would expect, especially with nothing plugged in.
Here are some consecutive debug samples to demonstrate.
<xbee {app_id: 0x83, address_16: 1, rssi: 75, address_broadcast: False, pan_broadcast: False, total_samples: 22, digital: [[-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1]], analog: [[824, -1, -1, -1, 486, -1], [806, -1, -1, -1, 488, -1], [657, -1, -1, -1, 486, -1], [494, -1, -1, -1, 486, -1], [337, -1, -1, -1, 481, -1], [204, -1, -1, -1, 474, -1], [130, -1, -1, -1, 465, -1], [108, -1, -1, -1, 458, -1], [162, -1, -1, -1, 458, -1], [326, -1, -1, -1, 478, -1], [520, -1, -1, -1, 486, -1], [671, -1, -1, -1, 486, -1], [783, -1, -1, -1, 486, -1], [805, -1, -1, -1, 486, -1], [802, -1, -1, -1, 486, -1], [747, -1, -1, -1, 487, -1], [580, -1, -1, -1, 486, -1], [419, -1, -1, -1, 483, -1], [262, -1, -1, -1, 475, -1], [153, -1, -1, -1, 468, -1], [111, -1, -1, -1, 458, -1], [117, -1, -1, -1, 449, -1]]}>
ampdata: [488, 486, 486, 481, 474, 465, 458, 458, 478, 486, 486, 486, 486, 486, 487, 486, 483, 475, 468, 458, 449]
voltdata: [806, 657, 494, 337, 204, 130, 108, 162, 326, 520, 671, 783, 805, 802, 747, 580, 419, 262, 153, 111, 117]
1 Current draw, in amperes: 0.409867172676
Watt draw, in VA: 56.8690702087
Wh used in last 2.03200006485 seconds: 0.0320994317645
<xbee {app_id: 0x83, address_16: 1, rssi: 76, address_broadcast: False, pan_broadcast: False, total_samples: 22, digital: [[-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1]], analog: [[426, -1, -1, -1, 478, -1], [257, -1, -1, -1, 478, -1], [146, -1, -1, -1, 469, -1], [116, -1, -1, -1, 461, -1], [108, -1, -1, -1, 453, -1], [262, -1, -1, -1, 470, -1], [458, -1, -1, -1, 486, -1], [615, -1, -1, -1, 486, -1], [749, -1, -1, -1, 486, -1], [812, -1, -1, -1, 486, -1], [809, -1, -1, -1, 486, -1], [789, -1, -1, -1, 486, -1], [642, -1, -1, -1, 486, -1], [478, -1, -1, -1, 485, -1], [319, -1, -1, -1, 479, -1], [191, -1, -1, -1, 472, -1], [119, -1, -1, -1, 462, -1], [103, -1, -1, -1, 453, -1], [204, -1, -1, -1, 461, -1], [366, -1, -1, -1, 479, -1], [535, -1, -1, -1, 486, -1], [686, -1, -1, -1, 486, -1]]}>
ampdata: [478, 469, 461, 453, 470, 486, 486, 486, 486, 486, 486, 486, 485, 479, 472, 462, 453, 461, 479, 486, 486]
voltdata: [257, 146, 116, 108, 262, 458, 615, 749, 812, 809, 789, 642, 478, 319, 191, 119, 103, 204, 366, 535, 686]
1 Current draw, in amperes: 0.675521821632
Watt draw, in VA: 99.6546489564
Wh used in last 2.04600000381 seconds: 0.0566370589291
<xbee {app_id: 0x83, address_16: 1, rssi: 75, address_broadcast: False, pan_broadcast: False, total_samples: 22, digital: [[-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1]], analog: [[109, -1, -1, -1, 458, -1], [207, -1, -1, -1, 463, -1], [367, -1, -1, -1, 480, -1], [534, -1, -1, -1, 486, -1], [683, -1, -1, -1, 486, -1], [791, -1, -1, -1, 486, -1], [815, -1, -1, -1, 486, -1], [812, -1, -1, -1, 486, -1], [734, -1, -1, -1, 486, -1], [564, -1, -1, -1, 486, -1], [405, -1, -1, -1, 482, -1], [251, -1, -1, -1, 475, -1], [148, -1, -1, -1, 467, -1], [116, -1, -1, -1, 459, -1], [111, -1, -1, -1, 450, -1], [276, -1, -1, -1, 469, -1], [450, -1, -1, -1, 485, -1], [607, -1, -1, -1, 486, -1], [743, -1, -1, -1, 486, -1], [795, -1, -1, -1, 487, -1], [793, -1, -1, -1, 486, -1], [778, -1, -1, -1, 486, -1]]}>
ampdata: [463, 480, 486, 486, 486, 486, 486, 486, 486, 482, 475, 467, 459, 450, 469, 485, 486, 486, 487, 486, 486]
voltdata: [207, 367, 534, 683, 791, 815, 812, 734, 564, 405, 251, 148, 116, 111, 276, 450, 607, 743, 795, 793, 778]
1 Current draw, in amperes: 0.546489563567
Watt draw, in VA: 74.0037950664
Wh used in last 2.03200006485 seconds: 0.0417710323261
<xbee {app_id: 0x83, address_16: 1, rssi: 79, address_broadcast: False, pan_broadcast: False, total_samples: 22, digital: [[-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1]], analog: [[604, -1, -1, -1, 486, -1], [775, -1, -1, -1, 488, -1], [820, -1, -1, -1, 487, -1], [817, -1, -1, -1, 486, -1], [759, -1, -1, -1, 486, -1], [622, -1, -1, -1, 486, -1], [459, -1, -1, -1, 485, -1], [301, -1, -1, -1, 478, -1], [180, -1, -1, -1, 469, -1], [122, -1, -1, -1, 460, -1], [106, -1, -1, -1, 451, -1], [222, -1, -1, -1, 462, -1], [389, -1, -1, -1, 481, -1], [554, -1, -1, -1, 486, -1], [702, -1, -1, -1, 487, -1], [802, -1, -1, -1, 487, -1], [799, -1, -1, -1, 486, -1], [796, -1, -1, -1, 486, -1], [700, -1, -1, -1, 486, -1], [542, -1, -1, -1, 485, -1], [357, -1, -1, -1, 479, -1], [202, -1, -1, -1, 468, -1]]}>
ampdata: [488, 487, 486, 486, 486, 485, 478, 469, 460, 451, 462, 481, 486, 487, 487, 486, 486, 486, 485, 479, 468]
voltdata: [775, 820, 817, 759, 622, 459, 301, 180, 122, 106, 222, 389, 554, 702, 802, 799, 796, 700, 542, 357, 202]
1 Current draw, in amperes: 0.459203036053
Watt draw, in VA: 63.715370019
Wh used in last 2.03099989891 seconds: 0.0359460861299
tweet-a-watt calibration problem...
Moderators: adafruit_support_bill, adafruit
Please be positive and constructive with your questions and comments.
-
- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: tweet-a-watt calibration problem...
are you doing anything thats different than the instructions? like a different model of k-a-w?
also check your wiring, sometimes people say they have this issue and then they mention that some soldering was loose and that fixed it
also check your wiring, sometimes people say they have this issue and then they mention that some soldering was loose and that fixed it
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
I checked everything, and it all seems fine.
My Kill-a-watt p3 model 4400 looks different inside from the instructions, but it has a DIP 2902.
I saw this thread, and so I pulled the xbee from the transmitter, and after some difficulty (sleep mode is a BANNED) I changed the sleep cycle to 5 sec. instead of 2, and used the defaults on your download page. (BTW, you should remind people to reset their own PAN-ID if they use that file.)
after running a while, It seems better, but still jumps around between 0.06 W and 9 W.
I haven't done all the python/google magic to graph things, but the shareware energy logger shows
a sinusoidal Voltage, but random amps with nothing connected.
I'll post photos to see if you can spot something. I have another kill-a-watt I can try, but it's similar vintage.
My Kill-a-watt p3 model 4400 looks different inside from the instructions, but it has a DIP 2902.
I saw this thread, and so I pulled the xbee from the transmitter, and after some difficulty (sleep mode is a BANNED) I changed the sleep cycle to 5 sec. instead of 2, and used the defaults on your download page. (BTW, you should remind people to reset their own PAN-ID if they use that file.)
after running a while, It seems better, but still jumps around between 0.06 W and 9 W.
I haven't done all the python/google magic to graph things, but the shareware energy logger shows
a sinusoidal Voltage, but random amps with nothing connected.
I'll post photos to see if you can spot something. I have another kill-a-watt I can try, but it's similar vintage.
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
2902 attachment. Pin 4 looks a little sketchy, but voltmeter shows no bridging to Pin 3.
Xbee board wiring.
The whole enchilada:
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
Hooked it up to the other kill-a-watt, and now the variance is from 0 to 2.4 VA.
The kill-a-watt reads 0-1 (it did the same before I installed tweet-a-watt) nothing plugged in.
I think it's somewhat telling that I reprogrammed the sleep time to 2 sec and again it was reporting 50-65 watts. 5 sec back to 0-2.4. Changing it to 10 seconds didn't seem to improve it much more.
crappy power supply? If I hooked it up to an arduino 5v would that supply enough power to verify?
I went on to amazon, and saw a lot of bad reviews for the kill-a-watt itself, mostly quality control issues. People loved it, but had a high failure/return rate. If the answer is to get a new kill-a-watt, is there a strategy for finding a good one?
The kill-a-watt reads 0-1 (it did the same before I installed tweet-a-watt) nothing plugged in.
I think it's somewhat telling that I reprogrammed the sleep time to 2 sec and again it was reporting 50-65 watts. 5 sec back to 0-2.4. Changing it to 10 seconds didn't seem to improve it much more.
crappy power supply? If I hooked it up to an arduino 5v would that supply enough power to verify?
I went on to amazon, and saw a lot of bad reviews for the kill-a-watt itself, mostly quality control issues. People loved it, but had a high failure/return rate. If the answer is to get a new kill-a-watt, is there a strategy for finding a good one?
-
- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: tweet-a-watt calibration problem...
if you dont insert the xbee, does it work?
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
Not sure I understand the question. The Kill-a-watt itself seems to behave the same way (working, though with a small variable 0-1 watt reading with nothing plugged in.) it did before installation. I can take the xbee out tonight when I get home, but I'm not sure I'll see any difference.adafruit wrote:if you dont insert the xbee, does it work?
I seem to get the same behavior in both kill-a-watt's, though I am using the same transmitter setup, so it is possible that I screwed something else up.
Should I test the power supply theory? I don't have a bench supply but I could hook up an arduino or a minty-boost. I imagine I would have to tie the grounds together because the vref is relative to the kill-a-watt ground?
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
In looking at my own pictures, I noticed that I omitted C2 (power supply capacitor) (comes from reading instructions on my iphone)
I put that in, and checked the reset cap as well. Still the same behavior.
I noticed the Current draw in VA would suggest a voltage around 170? Is there something wrong on the voltage divider side of the input? is there another calibration I've missed?
I put that in, and checked the reset cap as well. Still the same behavior.
I noticed the Current draw in VA would suggest a voltage around 170? Is there something wrong on the voltage divider side of the input? is there another calibration I've missed?
-
- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: tweet-a-watt calibration problem...
from all the other posts we've seen, it always seems to be a misconfiguration or a skipped step so of course we suggest going through the instructions and making sure you did everything properly
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
I've really gone over the whole thing with a magnifier, and checked my soldering, etc.
I did find that one error with the power supply, but fixed that. I still have to set the sleep time to 5 seconds to not get bogus readings. Now (with the 5 second time) I get between 0-2 Watts with nothing plugged in. Note the amp data seems pretty consistent, and right in line with what the instructions say. I didn't see a way to calibrate for voltage in the code.
One thought that occured to me, and I haven't fully grokked the code yet, is do I need to change something, because I've changed the sleep time? I would now have fewer samples for the same amount of time.
ampdata: [495, 492, 492, 492, 492, 492, 492, 492, 492, 495, 492, 492, 492, 492, 491, 492, 492, 492]
voltdata: [700, 522, 372, 246, 169, 155, 176, 299, 471, 642, 751, 814, 826, 770, 626, 449, 304, 205]
1 Current draw, in amperes: 0.0265654648956
Watt draw, in VA: 2.34155597723
ampdata: [494, 491, 492, 491, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [780, 821, 824, 726, 586, 432, 288, 193, 157, 159, 281, 429, 583, 717, 808, 824, 806, 684]
1 Current draw, in amperes: 0.0151802656546
Watt draw, in VA: 2.20872865275
ampdata: [494, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [655, 760, 815, 826, 748, 594, 440, 295, 199, 159, 154, 257, 400, 556, 706, 789, 821, 824]
1 Current draw, in amperes: 0.00759013282732
Watt draw, in VA: 0.629981024668
ampdata: [494, 492, 492, 492, 492, 492, 492, 491, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [475, 625, 741, 809, 824, 784, 663, 486, 320, 216, 164, 153, 221, 371, 547, 689, 784, 820]
1 Current draw, in amperes: 0.011385199241
Watt draw, in VA: 0.0607210626186
ampdata: [495, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [307, 480, 631, 745, 812, 825, 779, 656, 480, 314, 211, 162, 153, 226, 377, 553, 716, 789]
1 Current draw, in amperes: 0.011385199241
Watt draw, in VA: 1.05882352941
I did find that one error with the power supply, but fixed that. I still have to set the sleep time to 5 seconds to not get bogus readings. Now (with the 5 second time) I get between 0-2 Watts with nothing plugged in. Note the amp data seems pretty consistent, and right in line with what the instructions say. I didn't see a way to calibrate for voltage in the code.
One thought that occured to me, and I haven't fully grokked the code yet, is do I need to change something, because I've changed the sleep time? I would now have fewer samples for the same amount of time.
ampdata: [495, 492, 492, 492, 492, 492, 492, 492, 492, 495, 492, 492, 492, 492, 491, 492, 492, 492]
voltdata: [700, 522, 372, 246, 169, 155, 176, 299, 471, 642, 751, 814, 826, 770, 626, 449, 304, 205]
1 Current draw, in amperes: 0.0265654648956
Watt draw, in VA: 2.34155597723
ampdata: [494, 491, 492, 491, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [780, 821, 824, 726, 586, 432, 288, 193, 157, 159, 281, 429, 583, 717, 808, 824, 806, 684]
1 Current draw, in amperes: 0.0151802656546
Watt draw, in VA: 2.20872865275
ampdata: [494, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [655, 760, 815, 826, 748, 594, 440, 295, 199, 159, 154, 257, 400, 556, 706, 789, 821, 824]
1 Current draw, in amperes: 0.00759013282732
Watt draw, in VA: 0.629981024668
ampdata: [494, 492, 492, 492, 492, 492, 492, 491, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [475, 625, 741, 809, 824, 784, 663, 486, 320, 216, 164, 153, 221, 371, 547, 689, 784, 820]
1 Current draw, in amperes: 0.011385199241
Watt draw, in VA: 0.0607210626186
ampdata: [495, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492, 492]
voltdata: [307, 480, 631, 745, 812, 825, 779, 656, 480, 314, 211, 162, 153, 226, 377, 553, 716, 789]
1 Current draw, in amperes: 0.011385199241
Watt draw, in VA: 1.05882352941
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- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: tweet-a-watt calibration problem...
those numbers look good, sounds like youve got it working now
the sleep time is irellevant, the code keeps track of time
the sleep time is irellevant, the code keeps track of time
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
so it's normal for it to bounce so much? It's close enough for my purposes anyway (I want to monitor my son's TV, so I can turn it off remotely when I know he's not home.
thanks.
thanks.
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- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: tweet-a-watt calibration problem...
yes, please see the instructions here http://www.ladyada.net/make/tweetawatt/software.html
Now you'll see that the Watt draw is 2W or less, instead of 40W (which was way off!) The reason its not 0W is that, first off, there's a little noise that we're reading in the A/D lines, secondly theres power draw by the Kill-a-Watt itself and fianlly, the XBee doesn't have a lot of samples to work with. However <2W is pretty good considering that the full sensing range is 0-1500W
- osbock
- Posts: 151
- Joined: Tue Jan 23, 2007 1:12 pm
Re: tweet-a-watt calibration problem...
Thanks, I did read that, but the instructions said 0-2, and I sometimes see it jump up to 5.
On the meter itself, it flickers +- 1-2 watts with a load, so they must be doing some smoothing.
I'll play around with the code to see what I can do.
Thanks again for your help. On to phase II. Integrating it with the router, and hooking up the x10 control...
On the meter itself, it flickers +- 1-2 watts with a load, so they must be doing some smoothing.
I'll play around with the code to see what I can do.
Thanks again for your help. On to phase II. Integrating it with the router, and hooking up the x10 control...
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- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: tweet-a-watt calibration problem...
forwards!!!
Please be positive and constructive with your questions and comments.