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This thread is a carry-over from the one covering the DIY cable for the ProChrono Digital USB interface. I figured a new thread would be appropriate to keep the wired vs. wireless discussions organized. The detailed instructions in the attached PDF file cover building a Bluetooth interface for the ProChrono Digital chronograph. In short, it describes how to build a Bluetooth receiver and use it to make a wireless connection between the ProChrono Digital and the PCRemote software on a PC. Two warnings, though: First, If you attempt this build there is a chance you could break any and all of the parts, including your chronograph. Do not attempt this if you are not comfortable installing Windows drivers & software, using a soldering iron, and guarding against electrostatic discharge (ESD). You alone are responsible for what happens to your equipment.Second, getting serial devices working over Bluetooth in Windows is straight-up voodoo. Seriously. There's about a 50/50 chance the Bluetooth receiver will work on the first pass through the instructions, and it's entirely possible to do everything right and still end up with a receiver that doesn't work. YMMV, but just know this up front.Having said that, here's a list of the components you'll need: Bluetooth-to-Serial Module ($7-18) CP2102 USB-to-Serial UART/TTL Module ($5-10) Switching Voltage Regulator ($5-6) Battery(ies) ($2-5) Battery Holder ($2-3) ⅛” (3.5mm) stereo cord and/or jack ($3-7) Power Switch (optional) ($1-2) 10kΩ Resistor ($1) Small Project Box/Enclosure ($3-7) So, depending on what components you select and how particular you are, you can build the Bluetooth receiver for +/- $45. I had a lot of fun working on this build. The majority of my electronics projects up to this point usually involved either a PC power supply or a 12V car battery. What you see in the instructions is a culmination of the lessons learned and the do-overs I worked through over the course of building the prototype. If you have any suggestions to add, please post them here or PM me. (I'm still looking for a 3.5mm stereo jack with an isolated SPDT switch that closes when the plug is inserted.) On my wish list of future projects: Get the Bluetooth receiver integrated inside the ProChrono Digital housing. Find some enterprising coder(s) to write an Android equivalent of the PCRemote software now that we have a Bluetooth option. Edit 6/9/13: I'll try to post some pics of the build once I clear the minimum post limit. DIY Bluetooth Interface for ProChrono Digital v1.0.pdf