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Forum Index : Microcontroller and PC projects : Android app for serial over bluetooth
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9066 |
Do you need a data inverter in the mix anywhere, or has that been taken care of? Smoke makes things work. When the smoke gets out, it stops! |
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vasi Guru  Joined: 23/03/2007 Location: RomaniaPosts: 1697 |
The only issue I can think of, maybe your module is not set to work at 9600. There must be some commands to set it at a desired baudrate. Look for that first... @Grogster, no need of inverters for such boards. Those are designed for direct connection to the Arduino/microcontroller RX/TX pins. Hobbit name: Togo Toadfoot of Frogmorton Elvish name: Mablung Miriel Beyound Arduino Lang |
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Raros Regular Member  Joined: 06/02/2012 Location: ItalyPosts: 55 |
Hello A few years ago I used to change the connection speed of the BlueTooth module "rbt-001", the program SimplyBlueCommander. I do not know if it is still valid and if it is suitable for you. Try it. 2014-10-06_220010_SimplyBlueCommander_v1.6.0.1_x_EBT.zip 2014-10-06_220103_easybt_examples.zip 2014-10-06_220539_rbt-001_Manual.part1.zip 2014-10-06_220604_rbt-001_Manual.part2.zip Raros |
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Synergetic Newbie  Joined: 14/01/2013 Location: New ZealandPosts: 22 |
It sends data from the Duinomite to the terminal/PC or Android just fine at the default 9600bps. If i change the speed at the duinomite side then only get garbled at the terminal as one would expect. That the duinomite is transmiting data to the terminal correctly seem to indicate that the speed is not the issue.... at 9600bps. (unless somehow TX and RX can be set at differing speeds???? .. Can NOT see how ? ) ( the speed is reported in the PC drivers when you pair to the BT HC-06 Module also and is shown as 9600,8,N,1,N in the properties for the BT Serial link Com port Driver so i conclude that this should be the same default on the TTL side of the BT module ??? ) The fact the PC pairs and connects OK to the BT Module at 9600 would seem to indicate the PC/terminal is sending data correctly to the bluetooth module OK also..?? ...right ? The only conclusion can arrive at is there is problem on the TTL side for the bluetooth module that is affecting the data signals on the receive side to the duinomite (transmit data from duinomite is OK ) ( receive data is garbeled) Data from terminal/PC arrives but is garbled on the Duinomite) Have tried each of the com ports on the duinomite and have tried more than one BT module ( ordered 5 pcs) All behave the same no matter what have tried... connect OK send data from Duino to PC/terminal is fine BUT the received data on Duino from PC/Terminal keyboard is garbled. Running out of things to try !!! |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5913 |
Can you connect the module to a USB to TTL converter and check the output with a PC. I am pretty sure it will be OK but it should be checked. If possible, with the same USB to TTL converter use its Rx side to monitor the data to and from the Duino (not both at the same time). A CRO to check the speeds would be usefull. I didn't have any problems with the HC-06 or HC-05 modules so I don't have any more suggestions. Jim VK7JH MMedit MMBasic Help |
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| Synergetic Newbie Joined: 14/01/2013 Location: New ZealandPosts: 22 |
Found a Serial terminal that allow to send in HEX.. So after MUCH hex data byte sending ...... the diagnosis is data is only being received if it contains zero follow by two ones (011) in the data byte eg the MSB DATA Nibble is either 3 (0011) 6 (0110), 7 (0111), B (1011). So my guess now is the Duinomite serial RX is looking for two stop bytes!! ( or the speed is really screwed on the RX clock of duino) ...hhhmmmmm.... |
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| Synergetic Newbie Joined: 14/01/2013 Location: New ZealandPosts: 22 |
Good suggestion but do not have USB to TTL serial device here, only USB<->RS232 levels.. |
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| Synergetic Newbie Joined: 14/01/2013 Location: New ZealandPosts: 22 |
Seems the CABLEs supplied WITH the BT module are TOOOO LONGGGG and getting cross talk and/or distortion of the RX Data stream !!!! |
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| Synergetic Newbie Joined: 14/01/2013 Location: New ZealandPosts: 22 |
The cables are about 8" (20cm) long.. One would not have thought that would NOT be an issue. Will after all that is why RS232 is +/-12v levels and NOT TTL normally |
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| Synergetic Newbie Joined: 14/01/2013 Location: New ZealandPosts: 22 |
Seems the CABLEs supplied WITH the BT module are TOOOO LONGGGG and getting cross talk and/or distortion of the RX Data stream !!!! The cables are about 8" (20cm) long.. One would have thought that would NOT be an issue. Will after all that is why RS232 is +/-12v levels and NOT TTL normally for ANY distance. Now have it working on the MiniMaxiMite but still not on Duinomite Mega. Separating the wires physically by "splitting" the RX and TX from each other was enough to get it going on MiniMXM. >> UPDATE: BT Module is now working fine on DuinoMite COM4 but receive data is still corrupted if installed on COM3 of DuinoMite Mega. ...hhmmmmm This maybe a a MMbasice bug that was supposed to be fixed in Ver4.5 but I have updated my Duinomite to 4.5 and the BT module still fails on COM3 but works fine on COM4. |
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