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nice! thanks shows how easy it is to upgrade to the newer modules and how they drop in .. the package shown in the photo is still available in the new BT 4.1 compliant chips and you can find them on

Hi Everyone...I have TT4 with the BT...when connecting to my Android phone and running APRSDROID...Smart Beaon on (won't tx)...I have to manually enter gps coordinates for app to tx...I have GPS5

Here is a link to a project similar to what you are doing. I got it to work on my TT4. It fits in the TT4 case. \\John KB7JJG https://www.f4fxl.org/putting-a-3-3v-hc-05-module-in-the-tinytrak-4/

Rick, There is no reset switch on the TT4 board, There are several versions of the TT4, built, kit, old, etc. but in general, the reset function is available on pin 4 or pin 9 of the Atmega chip.? (

I also just saw you asked on tt4, I don’t see one there off hand. ?To use the chips mentioned here on TT4 you need to adapt via the serial splitting (I think, I haven’t hacked on the tt4 much,

Rick, on a mtt4b its to the right of the two stand off LED, under the large 40pin ATMEGA- DIP to the left of the little DIP max232 chip. if that helps? Sw1 black button surrounded by silver retention,

Curiosity question...following this thread and the comments about the 'reset button' on the TT4 specifically.? WHERE is it :) [any replies saying 'on the board' will be sent to the devil you speak of

while I am pondering connecting a ESP32 to an AT128 .. I wonder aloud if anyone has ever tried to compile this projects source on the ESP32 for a even bigger upgrade aka the TT5 ? kelly

As I am sitting here pondering some ideas. and the stack of chips. I couldn't help to ponder .. the ESP32-WROOM chip will UART as well.. The cost is reasonably similar to a "HC-06" and can do, BT 4.1

Currently rebuilding my portable unit tossing out for a view. k7mhi

Heh, yup my exwife is somewhere sharpening now .. aliexpress, for delivery in 2022?… will update with any details when they float in! kelly

Kelly, Excellent. I am interested in finding out just how "Drop-in" the new module is! I am pretty sure that communicating with Apple's will still require Virgin blood to be spilled at midnight with a

Morning Allen, yup. Mainly, compatibility and stability, it’s a better rf chip (rtltek), compatibility with new standards, the Hc05 was gen1, SPP is huge enhancement for connectivity with anything.

Do you mean that you are going to do a BT module transplant on the MTT4BT? What functions do you hope to implement aside from SPP? 73, Allen AF6OF

headed down a new road, https://www.feasycom.net/bluetooth-classic-module/hc-05-bluetooth-transceiver-dual-module-fsc.html Kelly

Added all the linux bluetooth connection work over the last day, thanks to the comments and feedback from all! Device seems stable and functioning! Lots of updates!

thanks Allen, for the data points. all makes sense but still confusing why I saw clear text at 38400 and hours later 19200 I have never touched the jumper to program the HC05 unit only comes with two

Its getting a bit more into the weeds than I would like, but let me cover a few points about the MTT4BT and it's BT module. The BT module ordinarily sits in the MTT4BT and does nothing besides flash

Understood Rob and I agree - understand and feel you are hitting the nail to my issues on the head. Kelly

The key to #3 is that you MUST reset the processor without removing power to the Bluetooth module. Allen's comment of "The reset button only resets the TT4 chip, it will have no effect on the BT