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Re: MTT4BT Anyone actually get bluetooth to work?
On Sun, Dec 4, 2022 at 12:48 PM, <John.gesell@...> wrote:
https://www.f4fxl.org/putting-a-3-3v-hc-05-module-in-the-tinytrak-4/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 amazon.. I need a TT4-Mod page now! :) lots of upgrades mentioned in last thread with GitHub links for ideas passing Byonics UART off to ?rPi or ESP32/8266 is an easy mod to approach. you dont even need to remove or solder out the existing HC-05 on the MTT4 you can manipulate/remove the jumpers for serial re-direction directly into your GPIO TT4 upgrades to newer, with that link using "HC-06", or directly on header pins on the MTT4+ systems you can even remove the max232 and let GPIO handle it all in software.? this will uplift the hardware to 4.1 BT standards and open to anyone regardless of the phone, or OS used + add wifi eliminate some cables etc.. add a sense hat and you have a lot of APRS sensing activity to report on!? thanks for the link super helpful info! kelly, k7mhi |
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GPS question (TT4BT and APRSdroid)
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 connected and it works just find when running cable from phone to radio...but not when using BT...seems to me it's the Android app and nothing to do with TT4BT...the TT4BT connects and works fine when connected to laptop using BT connection...I could use your thoughts on this...
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Tony KF7JVL
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"Conflict is inevitable, combat is an option" |
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Re: MTT4BT Anyone actually get bluetooth to work?
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.? ( Yes, I know technically these qualify as "on the board") Which version of the TT4 do you have? We put a reset switch on the MTT4BT because it had plenty of room to do so, and it just made sense. The TT4 must be reset with software, de-powering, or by temporarily jumping the RESET input pin to ground.?
73,
Allen AF6OF -----Original Message-----
From: Rick/ KM4KQQ <km4kqq@...> To: [email protected] Sent: Sun, Dec 4, 2022 3:12 am Subject: Re: [TinyTrak] MTT4BT Anyone actually get bluetooth to work? 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 LOL]? Looking at the board pictures in the built hardware manual didn't clue me in.
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Re: MTT4BT Anyone actually get bluetooth to work?
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, when pressed makes audible click. It¡¯s about 5mil by 2mil.? kelly? |
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Re: MTT4BT Anyone actually get bluetooth to work?
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 LOL]? Looking at the board pictures in the built hardware manual didn't clue me in.
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Re: MTT4BT Anyone actually get bluetooth to work?
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 and can be Wifi which is very tasty advantage..? older chip will do wifi could remove the Max232 for this project? all mode bridge on a 32 I do think the chips mentioned prior posts will for sure "drop in" they look to be 100% a good upgrade. but I sort of want to take it a step further still pondering, it adds another CPU to the mix however and this costs power. 40ma HC-05, vs 260ma! on the ESP32?the 8266 is half that at 170ma tossing the idea out for others and more pondering... kelly |
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Re: MTT4BT Anyone actually get bluetooth to work?
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 sharpened Athane, but its worth a shot. Our big problem these days is even getting standard semiconductors and chips, so one virtue of the HC-05 is that it is made by oodles of manufacturers.?
73,
Allen AF6OF -----Original Message-----
From: Kelly via groups.io <kellykeeton@...> To: [email protected] Sent: Thu, Dec 1, 2022 6:18 am Subject: Re: [TinyTrak] MTT4BT Anyone actually get bluetooth to work? 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.?
Should work native with apple ;) and your market competitors are already there, so keeps up with the Jones¡¯s??
No plans to implement any of the disconnect or other fancy stuff (BLE), it appears a direct drop in upgrade so bonus nachos there. wont know for 2-3 weeks just ordered a few samples to test out. Also grabbed a BT5 version to sniff around.?
Longer goal of seeing winlink on Linux/iOS work directly with native apps without much effort. Kelly |
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Re: MTT4BT Anyone actually get bluetooth to work?
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.? Should work native with apple ;) and your market competitors are already there, so keeps up with the Jones¡¯s?? wont know for 2-3 weeks just ordered a few samples to test out. Also grabbed a BT5 version to sniff around.?
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Re: MTT4BT Anyone actually get bluetooth to work?
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 -----Original Message-----
From: Kelly via groups.io <kellykeeton@...> To: [email protected] Sent: Wed, Nov 30, 2022 11:27 pm Subject: Re: [TinyTrak] MTT4BT Anyone actually get bluetooth to work? headed down a new road,?
Kelly?
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Re: MTT4BT Anyone actually get bluetooth to work?
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 jumpers so I have not added a 3rd to try reprogramming anything. next time will video if it happens again!
possibly the linux implementation of bluetooth serial profile is a little more involved vs windows .. typically I would expect a bluetooth channel to operate at?115200, as it is with other UART devices on the market the $3 HC05 in AT command mode is slower?I understand. Given in windows you?don't?need to manually set up a?serial profile it seems that we are speaking two OS this whole time so confusion lies?within? if you have better documentation on how to get this product working in linux, not windows by all means I am all ears.. I searched but didnt find anything conclusive. but I do think beating a horse here, it works and I was able to fix it with baud change on the linux command screen to baud rate, which I understand isn't related and I will test with the little reset button you and Rob pointed out from his experience connecting BT. as for car performance with a raspberry, not sure what to say about that? you should see what JPL/NASA uses these blackberries for you would be surprised how many embedded devices sold to enterprise who use them, why there was a mandate to secure them away from the pi username and all, anyway to each their own, I have a few thousand Christmas lights running on them as well and reporting APRS telemetry on thermals. fun devices too bad price went up! anyway thank you I got lots of good data from you all and now to getting a LCD! I haven't read the the word?Satan as much as I have this thread, we get it?- foxcon is a mess so is apple but .. there is nothing we can do about those problem in this thread, I use hardware that I have and a few billion others do as well! so pray up last I checked?Satan didnt win the war so no need to worry about the hardware used! thank you for the data?helpful!? Kelly |
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Re: MTT4BT Anyone actually get bluetooth to work?
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 an LED indicating that it is getting power and ready to be paired. During this time, you can "Connect" to the BT module via RF, using SPP ( Serial port profile) but the BT module is not actually connected to either a serial port jack or to the TT4.?
It does not matter what your Baud Rate is set to; it can pair with a device with an SPP BT connection. Sadly, this does not include Iphones, which, being the work of Satan's evil mind and the handiwork of communist slaves, has only? AUDIO Bluetooth, and relies on Wifi to connect locally to the outside world.
There are jumpers in the MTT4BT that allow you to connect the BT module in various ways. The first bypasses the 2.5mm serial input and connects the BT module to one of the serial ports of the MTT4BT's TT4 chip. In order for this to work, the serial port and the BT Baud rate must be set the same.?When you set the jumpers this way, there is no connection between the 2.5mm jack and the rest of the unit, its just disconnected.?
?Since PORT A of the MTT4BT is by default set to 19200,N, 8 and 1, that is the way we program the BT device during production. If you change it, you will need to change the TT4's settings to match. You can connect the the DB-9 (PORTB) with a PC cable or direct plug in of a GPS. By default, this port is set up for a GPS, but it can be changed in configuration using a terminal program ( The GUI config program is not for MTT4BT users)?
Wireless communication via Bluetooth is subject to a number of vagaries, latency being the most troublesome, but the BT connection is a great way to connect to a DROID or Windows unit to run the various APRS mappping/messaging programs. I can't be a lot of help to you over the internet on trying to make your device and software compatible, you are on your own with that! If you CAN do a wired serial link, life will probably be easier.?
The BT device should never need to be reprogrammed.? If for some reason, you need to reprogram the BT module, there is a jumper position that allows you to connect the 2.5mm jack to the BT module directly theough the TTL/serial connection. Note that the TT4 chip is never used to control any of the BT's functions, programming the BT module is accomplished by putting the jumpers in the right place, connecting to the BT module through the 2.5mm jack, and communicating via a Terminal program.?
If for some reason, you feel that the fate of the free world requires you to change any of the settings of the BT module ( You are probably the kind of guy who thinks he can improve his car's performance by adding a Raspberry pi to the vehicles CPU, and should be watched closely!)? When the BT module is set up to be configured, the jumpers are placed appropriately, and a jumper used only for this purpose is placed, placing the BT module into the programming mode).
When you program the BT module, it will default back to 38400 Baud ( HC-05's are not a consistent device, and many people make them, so your mileage may vary), once you have made your changes, and removed the programming jumper, the unit will start working at whatever Baud Rate you set it for. This is why there is confusion about the different baud rates.?
The BT settings and operations are outlined in a couple of addenda next to the MTT4BT manuals on the Byonics web page.?
On another note, in most cases we can set up your units for you prior to shipping, since most people just want to use the MTT4BT as a mobile tracker/digi, most of the settings are just the defaults.?
I hope that some of this has made sense!
73,
Allen AF6OF
-----Original Message-----
From: Rob Giuliano via groups.io <kb8rco@...> To: [email protected] Sent: Tue, Nov 29, 2022 11:19 am Subject: Re: [TinyTrak] MTT4BT Anyone actually get bluetooth to work? 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 module." That reset switch is the component that allows it to happen. I think my case (from way back when) had a hole already drilled, but not properly aligned.? The hole in the case to allow the reset function to be accessed without removing the case, but also compromises the case I found a little rubber stopper to place over the hole in normal use, and only remove it when I need to reset the micro. The other option (once all else is configured), would be software reset. As for the baud rate, I can only guess that the module default is 38400, and the micro sets the baud rate t match the serial interface of the MTT4 defaults during startup. Rob KB8RCO |
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Re: MTT4BT Anyone actually get bluetooth to work?
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 module." That reset switch is the component that allows it to happen. I think my case (from way back when) had a hole already drilled, but not properly aligned.? The hole in the case to allow the reset function to be accessed without removing the case, but also compromises the case I found a little rubber stopper to place over the hole in normal use, and only remove it when I need to reset the micro. The other option (once all else is configured), would be software reset. As for the baud rate, I can only guess that the module default is 38400, and the micro sets the baud rate t match the serial interface of the MTT4 defaults during startup. Rob KB8RCO |
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