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Brian Enos's Forums... Maku mozo!


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  1. That's a tough one. Just guessing here, but it sounds like either the Bluetooth connection is dropping or the app is crapping out because it gets an unexpected response from the chronograph. It's possible something like a Bluetooth power saving function is a contributing factor.
  2. Link is on the ProChrono Digital USB page. Just click on V 1.90 Software Download near the middle at the top.
  3. That's really weird if you can change the baud rate, but can only change it to 9600 or higher. You could look into changing the baud rate on the ProChrono side, but at that point you may just want to save your time, spend the $6-9 and get a different manufacturer's BT module. Edit: What response do you get from the BT module when you issue the AT+BAUD1 command?
  4. I'm not sure what terminal software/connection you're using, but when I was configuring mine the AT commands typed into the terminal window were not echoed (i.e., you couldn't see what you typed in the terminal window). They also had to be in ALL CAPS and typed very quickly. So, I typed the commands out in a text editor then copied and pasted them into the terminal window. Having said that, from the Guide: If that doesn't work I would take a look at the USB-to-TTL module. As mentioned in a previous post, connecting to HC05/06 chipsets with anything but CP2102-based USB-TTL converters is sketchy. You might want to check out the reviews on the Virtuabotix BT2S page and their configuration guide for some additional info that could help.
  5. I haven't been able to do much with it since my last post. Checking the baud rate is an interesting idea. I guess you could experiment with different baud rates to get it to connect. Otherwise, someone with programming expertise will need to look at the handshake between the two to see where it falls apart. Maybe watching the handshake between the official Bluetooth module and the Android app would reveal something?
  6. It's listed under the name Digital Link by Competition Electronics in the Sports category. The link above to the Google Play store doesn't work for you?
  7. Couple of updates: • The good news: For those of you who didn't know, CED's Digital Link Android app for CED's Digital Link Bluetooth adapter (mentioned above) has been posted on the Google Play store! • The bad news: I have not been able to get CED's Digital Link Android app to work with the DIY Bluetooth interface. The Digital Link app gets stuck on "Looking for Digital Link...." and goes no further. However, BenOz's test app installed on the same Android device will still connect to the DIY interface. At this point, I suspect there is an initial handshake of some type between the Digital Link app and the Digital Link Bluetooth adapter. However, I'm a hardware guy, so I've reached the limits of my expertise in figuring this out. If someone knows how to sniff the serial connection between the app and the interface it may shine some light on how the Digital Link app is establishing the connection. Knowing that, we may be able to update the DIY Bluetooth interface to be compatible with it.
  8. Interesting. Not sure about iOS, but the Android software shouldn't care what the TTL transport mechanism is (e.g., Bluetooth, USB, etc.) just like the PC software. I'm definitely not a programmer, but I believe that would have been the least complicated/most likely to succeed route. It would be most unfortunate if the Android or iOS apps didn't work with a DIY solution. Yeah, there is that. They should send me a unit for free to make up for it.
  9. Well, damn.... Kinda pricey but, hey, that app has more capabilities than the PC version.
  10. Dude, you just got the Chrony Hack of the Year Award! I've been stumped just trying to figure out how to add a power LED (not even multi-color) to my original design.
  11. Missed this the first time around. Would definitely be interested in pics of the hardware, etc..
  12. Make sure the 10k resistor is between the TXD (tip) and GND (sleeve) coming from the ProChrono side (on the BT2S side it would be between the RXD and GND). Take a look at the Wired Connections troubleshooting section at the end of the guide in the first post. I put some steps in there that may be helpful given what you've described. If you're still having trouble after that, I would get in touch with Virtuabotix tech support. They were solid gold when I was building and troubleshooting the prototype.
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