• Nrf24l01 SMA connector mod

    08/09/2014 at 04:21 • 0 comments

    I cut the pcb just above the bottom of the zig zag pcb antenna, remove the copper going from the signal line and ground, then scap the soldermask off near the passives, that is also a grounded point.

    On the revers side scrape off the soldermask where the ground pins will sit then solder it up the connector doesn't fit the width of the pcb, you can wedge the pcb material you cut off earlier if you want to make the connector stay while soldering.(friction fit)

    Here is the end result with an antenna salvaged from an old router.

    Also some video of testing the mod and some explaining.

    Another version with just a bit of wire.


  • Serial Auto Reset mod

    06/23/2014 at 03:02 • 0 comments

    If you have ever tried to use a third party serial module to send info to an ardueno you may know that generic $1-4 adapters on eBay just don't wok, unless you press the reset button at the perfect time during upload. Or you have gotten this error below that basically means i could not talk to anything that looks like an ardueno boot loader. 

    "avrdude: stk500_getsync(): not in sync: resp=0x00"

    However they is a very easy fix to that problem. When the serial chip in most usb modules are accesed/programing starts it flips DTR and CTS. The arduneo and this mod both use that to trigger a reset of the ardueno, easy way to take advantage of this is a small cap that is used to allowe only ac aka changing voltage to get past it, triggering the arduneo when inital connection is made to the serial module.

    So anyways, How to mod a CP2102 usb to ttl adaptor with a .1uf cap

    Here is the seller I got it from.

    http://www.ebay.com/itm/251336835653?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

    Useing a though hole .1uf capacitor 

    Using an SMD805 .1uf capacitor.