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Re: Connect a Dual Counter to a WattNode
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Posted by Bill on Thursday, 21 January 2010, at 9:57 p.m.,
in response to Re: Connect a Dual Counter to a WattNode, posted by Constantin
Thank you.
After returning from being out of town, I looked carefully at all 4 options:
(1) Soldering in to my WEL Rev. 3.2 board a wire to carry regulated 5 VDC along my existing 1-wire network cable.
(2) Changing my WEL Rev. 3.2's voltage switch to supply +5 VDC and changing my RH sensors to run on +5 VDC.
(3) Continuing to run my Hobby Boards Counters in a 'pull-down' configuration, with a resistor large enough to prevent overloading the 1-wire network but small enough to ensure at least 200 Hz frequency response capability at the Counter's input.
(4) Build a local +5 VDC supply, located at the Counter unit.
Not being too skilled with a soldering iron, I ruled out option (1).
Taking apart my RH sensors to do some soldering also looked to be a fair amount of work.
For the 3rd option, I did some analysis and figured out, for the old style WNA WattNodes, a 100K pull-down resistor still allows for a greater than 200 Hz frequency response. And current draw on the one-wire network is on the order of 40 microamps. After putting in the 100K ohn resistors, I looked at the WattNode's pulse output on an oscope, and the square wave has reasonable form.
For one of my WattNodes, it's connected, via CTs, to an inverter that has a revenue grade kWh digital meter. So as another test to confirm the counter will work connected with a 100Kohm pull-down resistor, I matched up the WEL produced count with the inverter's display.
Given that I determined that I am not losing pulses with a pull-down 100KOhm resistor configuration, I didn't proceed to look at the details of the 4th option. I appreciated the creative suggestion.
Best regards,
Bill
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