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Forums SEGmeter Unlabelled, empty 2pin header next to reset button

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bdp
Mar 20, 2011 1:24pm
3 posts

Hi all,

  I tried pushing a 3-pin header into the prototyping area and found the holes have been drilled too small (I'd thought I could mount a few additional temp sensor connectors) and I noticed the extra 2 holes next to the reset button.

 These holes are large enough to fit a 2pin header into and I flipped the board to see the tracks run to the button and transistor.

 I've read something about a 'watchdog timer to be implemented by the user'. Is that what this header is intended for?

 Has anyone made use of it?

 
Samotage_300_medium
Mar 20, 2011 11:26pm
555 posts

Hey Bryan,

The watchdog is part of the extra stuff that is supported by the board, though not fully implemente.  One option is to have the Zigbee fire a reset of the Arduino, hence the transistor to bost the output from the Zigbee pin from 3.3 to 5V for the Arduino reset.  Another option (hence the jumper) is to build out a watchdog on the prototype are with a 555 or other timer.  The two holes you mention are enabling the Zigbee watchdog (not implemented) or to choose another custom option

As it turns out, the operation has been quite reliable and a watchdog hasn't been something we have needed to implement.

The holes are just fine for normal through hole componentry, though they are a little small for normal headers.  Usually I just give them a little drill with a small hand tool that elanges the hole to suit.

created on: 03/21/11 

Sam,

@samotage

 
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bdp
Mar 21, 2011 3:11am
3 posts

Thanks Sam,

  I usually avoid drilling out holes for risk of losing all the hole plating, though in this case we're not dealing with RF and the top layer has no connection to anything else so there's no risk in it.

  Unless I've missed an update somewhere, the onewire code is still in development so I won't need to do it any time soon. I wanted to avoid twisting and soldering together wires but it's probably even cleaner to mount a series of 3.5mm phono sockets on the enclosure and wire the sockets together and run a single connector back to the SEGmeter board.

 
Samotage_300_medium
Mar 25, 2011 10:41am
555 posts

Hey Bryan,

The prototype area is just that - holes, so drill all you like! 

Another option could be to use the stereo plugs on a SEGmeter board, and instead of completing the filter circuit, just run say the tip feed to the onewire signal.  Note, the ring gets 5V and the base is ground.

Sam.

 
Samotage_300_medium
Mar 26, 2011 10:26pm
555 posts

Or, turn the problem around the other way...  A female normal pitch header will fit just nicely into the prototype holes!

Sam.

 
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bdp
Mar 27, 2011 12:20am
3 posts

Sam, this thread began because the normal pitch header won't fit into the prototyping area without additional drilling.

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