I'm putting the final touches on the Cricket Communicating Thermostat. I've added an LCD option but when I layout the PCB I'm not sure if I should use 7x2 or 14 pin inline pads. Seems LCDs have both and a few have 16 for the AK connections.
I'm tending towards the inline with the extra 2 pins. I don't want to include both as I'm trying to keep the cost & size down, might even try for a single sided PCB....
You can see the Cricket schematic at
Bill
7x2 is my preference, because you can then use IDC ribbon cable to connect them when positioned on a front panel.
Also, 2-row headers are more inclined to stay upright when soldering than
1-row headers.7x2 is nice. 1x14 .100 is okay. 1x14 .050 is annoying (usually meant to be soldered to ribbon cable that terminates in 7x2).
I just ran into an LCD that swapped VCC/GND on the first two LCD pins, and I was so sure they wouldn't do that that I fried the first one. That's the nice thing about standards... so many to choose from.
-- Ben Jackson http://www.ben.com/
I used to use the phase "Highly Standardized".
Luhan
I've done both 14-DIP and 7x2 header. Though the DIP IDC headers I use grip machined-pin DIP sockets like grim death (resistant to backing out), most of my designs use 7x2, 0.1" header.
Many machined-socket DIP sockets are only designed for a single or very low number of insertion/removal cycles, as the socket is purposely & permanently deformed when you stick a DIP device in it. Hence the death grip...
I'd recommend a 7x2 0.1" header as well.
They have barbs on the inside, like on a fishhook - they'll dig into the lead if you try to pull it out:
Cheers! Rich
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