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Re: Connect a Dual Counter to a WattNode
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Posted by Phil on Saturday, 16 January 2010, at 9:28 a.m.,
in response to Re: Connect a Dual Counter to a WattNode, posted by Bill
Yes, you description of the wiring is correct. The 1M is inconsquential if your pullup is 1-10K
Hmmm. Power.....
It's too bad that Hobby Boards didn't design those two products to use the same supply voltage.
If you need to get +5V off the WEL board WHILE you have the External power switch set to RAW DC, there is only one easy place to do it. There is an open hole/pad on the PCB, next to the mounting screw by the 1-Wire screw terminals. If you look at the copper traces under the silk screen, you will see a small "+V" symbol next to the pad (next to the white J3 label). This is the same 5V used everywhere on the board. The hole is probably large enough for a small wire to be soldered in.
I'm not recommending this, just letting you know it's there. Buyer beware :)
Another alternative (if you have your soldering iron out) is to switch your Humidity board to use 5V instead of 9-12.
I looked at the schematic, and there are a couple of ways to do this.
1) You could is short the input and output of the 5V regulator together (bypassing it), and then you could run the board on external 5V. Looking at the scematic, the easiest place to do this would be to just short the plus sides of the two can capacitors together. Probably just take a short piece of copper wire and a fine touch :)
2) Another alternative would be to supply the 5V directly to pins 1 and 2 of the power jumper. This has the advantge of still keeping the capacitor in the circuit, but not needing any soldering on the board.
Just make sure you switch the WEL's DC output to +5V before you make the board change :)
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