I used black tape and a small opening window, to minimize the influence of external light on the measure.įinally, here is a view of the device mounted on the water meter: Here is a view of the top:Īnd here is a view of the bottom, with the small opening for the IR LED & photodiode.
To ensure that the sensor would be properly located right above the border of counting wheel, I cut a plastic mount plate fitting the original meter shape and plastic pegs positions, then taped the sensor on top of it. In my case however, it turned out to be difficult to find an appropriate threshold that would correctly detect the wheel rotations, so I ended up using the analog output (A0) and implementing my own filtering/threshold detection logic in the arduino Installation Quick & dirty mounting plate D0 ouput changes state when the threshold is crossed. Note: the D0 output is the digital output of the voltage comparator, which threshold can be set with the onboard potentiometer. So the interface if quite simple: supply VCC (5V) and GND, and the analog value of how much light is getting received on the photodiode is available on pin A0: The module I bought integrates the TCRT5000 along with an integrated voltage comparator (that I will not use) and a couple of LEDs and resistors. Light emitter & sensor: I chose to use a TCRT5000 module (less than 4$ at DealExtreme), it includes an IR LED with associated IR photodiode. A battery pack could probably do the trick too, but since this device will be located in my garage, I did not want to bother changing batteries every now and then, nor did I want to optimize the setup for lowest possible power consumption (which would require a smarter arduino code, waking up from sleep upon an external event when the watermeter activates) For the final setup, I used a separate 5V power supply.
Sensus water meter box how to remove pro#
The two round plastic pegs will be useful for the mechanical alignment of the sensor on top of the wheel (more on this later) Assembling the sensor systemĪrduino board, in my case I selected a Funduino pro mini, but any version will do:Ī power supply for the arduino and sensor module: during tests I just supplied the arduino through a USB-FTDI cable (see here), which was also used to program the arduino. An Arduino is just fine to perform these continuous readouts, implement the counting of the total number of turns, and send this data over a wireless link to some logging server: Putting an LED and photodiode above the border of this wheel allows to detect each turn of the wheel, simply by detecting the variations in reflected light. The interesting part is the half-red/half-silver wheel that spins when water flows through the meter.
Also, it requires replacing the original water meter, which I am pretty sure my water company would not allow.
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