Gas and electricity monitor

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Contents

about

This project came about because I wanted to learn how to do power and gas measurement myself. I thought gas measurement would be difficult but actually it can be easy; depending on your meter. My meter has a magnet on the least significant dial, so I just need a hall effect sensor to detect when this is passing.

I'm using code from the open energy monitor project for the current measurement. This uses a current clamp.

I don't have a power supply near my gas and electric meters, so this is a low power wireless metering system that sends the data to a nanode, which in turn uploads to pachube.

links

code

for the nanode pachube putter:

https://github.com/mattvenn/arduinosketchbook/tree/master/pachube_gas_monitor

for the remote energy monitor:

https://github.com/mattvenn/arduinosketchbook/tree/master/gassender

xbee config

Both should be on the same network ID and should send and receive from each other.

For the remote monitor, we use sleep mode 1 so we can control sleep mode with the micro:

commands="ATRE,ID3456,MY1,DL2,SM1,WR"

For the nanode side, we turn on serial uart IU1:

commands="ATRE,ID3456,MY2,DL1,IU1,WR" #for output module

hardware

pachube putter

This is just a nanode running the above software with an xbee' TX line attached to pin 5.

wireless monitor

This is a bit more complex; it measures:

  • battery voltage
  • gas pulse
  • current with a current clamp
  • temperature

It sleeps a lot and is running on 3.3v. The standby current draw is about 2.5mA, though about 2mA of that is from the hall sensor (haven't found a way of reducing this yet).

The schematic and board are here

https://github.com/mattvenn/energy-monitor-pcbs

links and thanks

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