$5 Power Meter
Intro: $5 Power Meter
Lets build a $5 web based power meter and break open our usage to those with solutions to our antiquated grid and lifestyles.
This is a great start=> Real-time Web Based Household Power Usage Monitor
And here's a leading commercial product => TED
The device can serve residences, organizations, and communities trying to understand and reduce their energy use. .
The data will be hosted online so it can be audited by 3rd parties. The data might be hosted by Google's Power Meter and 3rd parties may gain access to market their energy savings solutions; such as, a new refrigerator, heating system, or efficient lights, etc.
Why do it? well the utilities are not going to... (they're old and slow moving) and the smart grid is a hoax.... and it should be kinda fun to show up the expensive, commercial products available.
Would you like to collaborate on a potential disruptive product?
This is a great start=> Real-time Web Based Household Power Usage Monitor
And here's a leading commercial product => TED
The device can serve residences, organizations, and communities trying to understand and reduce their energy use. .
The data will be hosted online so it can be audited by 3rd parties. The data might be hosted by Google's Power Meter and 3rd parties may gain access to market their energy savings solutions; such as, a new refrigerator, heating system, or efficient lights, etc.
Why do it? well the utilities are not going to... (they're old and slow moving) and the smart grid is a hoax.... and it should be kinda fun to show up the expensive, commercial products available.
Would you like to collaborate on a potential disruptive product?
STEP 1: What Has Been Done So Far.....
What has been done so far........
Well beyond the cool instructables that I've already mentioned..... here is where this project is at:
Fabricated a prototype PCB using the ADE 7757 power meter IC (see schematic)
ADE7757 $3.20 - digikey
ADE7757 Analog Inputs
The current sensor (CT sensor) goes to pins V2p and V2n and supplies a max differential voltage of +/- 30 mV to the on board ADC.
The voltage leads go to pins V1N and V1P to supply a max differential signal of +/- 165 mV to the on board ADC.
ADE7757 Analog Outputs
The ADE7757 is a high accuracy electrical energy measurement IC. The ADE7757 supplies average real power information on low frequency outputs in the form of active low pulses with a relatively low pulse rate ~0.175 Hz.
A typical US residence requires qty(2) CT sensors to quantify energy usage. I've experimented with some inexpensive current sensors here.
Well beyond the cool instructables that I've already mentioned..... here is where this project is at:
Fabricated a prototype PCB using the ADE 7757 power meter IC (see schematic)
ADE7757 $3.20 - digikey
ADE7757 Analog Inputs
The current sensor (CT sensor) goes to pins V2p and V2n and supplies a max differential voltage of +/- 30 mV to the on board ADC.
The voltage leads go to pins V1N and V1P to supply a max differential signal of +/- 165 mV to the on board ADC.
ADE7757 Analog Outputs
The ADE7757 is a high accuracy electrical energy measurement IC. The ADE7757 supplies average real power information on low frequency outputs in the form of active low pulses with a relatively low pulse rate ~0.175 Hz.
A typical US residence requires qty(2) CT sensors to quantify energy usage. I've experimented with some inexpensive current sensors here.
STEP 2: Programming
Read the Power
The CF pin on the ADE 7757 outputs a frequency. Here are two descriptions on how to read frequency using the Arduino Frequency Counter Library:
The Academy of Media Arts Cologne
Some list serve.......
Send the Power Data
Arduino Ethernet Shield and use the serverWrite() to send the data to any address. Is it really that easy?
Likely going to try to get a hold Google's API for their powermeter to help move the prototype along.
This guy hosts his own data here. Its a pretty neat application that logs the data locally and provides a nice graph.
tupelo-schneck.org/its-electric.html
The only problem is you need a computer ON 24/7 to grab and record the energy data. It would be nice for this data to be logged and displayed remotely.
The CF pin on the ADE 7757 outputs a frequency. Here are two descriptions on how to read frequency using the Arduino Frequency Counter Library:
The Academy of Media Arts Cologne
Some list serve.......
Send the Power Data
Arduino Ethernet Shield and use the serverWrite() to send the data to any address. Is it really that easy?
Likely going to try to get a hold Google's API for their powermeter to help move the prototype along.
This guy hosts his own data here. Its a pretty neat application that logs the data locally and provides a nice graph.
tupelo-schneck.org/its-electric.html
The only problem is you need a computer ON 24/7 to grab and record the energy data. It would be nice for this data to be logged and displayed remotely.
STEP 3: Design Goals
Design Goals
Cheap!
Grab real power in watts for the whole house usage (close to figuring out)
Broadcast the data over the home Ethernet/router to the hosted website (need to figure out)
Cheap!
Grab real power in watts for the whole house usage (close to figuring out)
Broadcast the data over the home Ethernet/router to the hosted website (need to figure out)
16 Comments
anandbangad 10 years ago
i want to prepare a pcb layout using IC ADE7757 but I am unable to find the IC ADE7757 in eagle cad....It would be really helpful if you could give the .sch file for the schematic image
hydronics 10 years ago
Hi Anan,
When I started this project 5 years ago I wasn't sure of what I was doing and I've learned a lot sense. I saw on digikey that this chip is still available but I'm not sure if it still the best chip to use and honestly I wasn't great a chip selection when I chose it. Regardless! to answer your question, if you look at the package type on the digikey website it says, 16-SOIC. This is a readily available package in the sparkfun library. I'm sorry no longer have the my original eagle library to give you but its super simple to grab the 16-soic from the sparkfun library and relabel the pins as needed. I think either sparkfun or adafruit have a good tutorial on this. Have fun! and good luck. -tom
anandbangad 10 years ago
anandbangad 10 years ago
i want to prepare a pcb layout using IC ADE7757 but I am unable to find the IC ADE7757 in eagle cad....It would be really helpful if you could give the .sch file for the schematic image
itisnot_me 12 years ago
mark.duyvesteyn 14 years ago
https://www.instructables.com/id/the-real-5-web-based-power-and-gas-meter/
its a work in progress, will add more to it over the next week or so. First time poster so let me know what you think.
hydronics 14 years ago
paulstich 14 years ago
hydronics 14 years ago
You can just use a controlled load of some sort to perform the calibration. Look forward to seeing how you do it.
mark.duyvesteyn 14 years ago
hydronics 14 years ago
mark.duyvesteyn 14 years ago
fernandocasar 14 years ago
There are other network enabled platforms like Dangerous prototypes web platform for $35.
I agree with mrmucox that you should post this in the community forums, I'll be pleased to collaborate, I'll be checking out the forums but please let me know if you do.
Thanks
mrmucox 14 years ago
SmartGrid is NOT a hoax, most utilities are in the process of adopting SmartGrid technology. It's a brand new technology, and utilities are evaluating, testing, and even piloting it as we speak. You can't expect a utility to go around willy-nilly, installing every new piece of tech. You think the grid is bad now, try it with unproven tech all over the place. To be fair, I currently work for a utility company in the US, who has a currently operating SmartGrid pilot program, and plans to spend $200 million on SmartGrid over the next few years. The hardest part is the communication. BPL (broadand over Power Line) does not have very good range, and wireless is slow (using a mesh type network), or expensive (WiMax).
I could go on, but I'll leave it here. If you can come up with a $5 meter, then cheers, you're better than me.
hydronics 14 years ago
This project hopes to bypass the utilities in an effort to prototype an affordable real-time in-home power meter. If you think real-time energy data is important than you are with me. When is your utility planning on providing this to you? I have a fairly progressive utility but providing real-time data to me is way down in their wish list of smartgrid toys. They just don't see the writing on the wall.
mrmucox 14 years ago
As for the SmartGrid, allowing the customer to see their usage is an integral part of our/most implementations. It's at least 3-5 years out that it will be rolled out even to limited areas, but calling it a "hoax" is what I was calling you out on.