The first machine already has a bluetooth module connected to an Arduino Mega as a slave to a mobile phone and after further research, I can't make the bluetooth module as a Master and a Slave concurrently.
However, after much wiring, I realised that I can't put two bluetooth modules on the Arduino Mega as the bluetooth module that I'm currently using only uses 3.3V.
I am thinking of getting another Arduino board so that the master Bluetooth module will be a standalone. Is it a good idea?
You cannot do it concurrently, but you might do it alternately. All you need do is control the power supply to bluetooth so that you can reconfigure it.All you need do with that approach is use 5v bluetooth modules - like almost everybody else does and, since you have four serial ports on a Mega, it is probably the easiest method. I believe using a single bluetooth on Mega's 3.3v pin isn't such a good idea anyway.Probably not. Indeed it sounds like a very bad one.You can also safely ignore the guy with the hypersensitive Canadian friend. Nobody can be that stupid, and he is probably pulling your leg anyway - or quite likely the Canadian was. If you don't use conventional language, nobody will be able to understand you when you have a communications problem.
I was not aware the RN42 is 3.3v, so the first thing you need to do is ensure that it is kosher to run on Mega's 3.3v @ 50mA maximum. My comment on the suitability still stands, and goes double if you want to use two. You may need to power them separately off Mega's VIN, or something. Your lack of scientific terms is far less of a problem than the coherence of your explanation of what you are trying to do, but you certainly have not come up with an proper explanation for using another Mega. About the only reason for doing so is that your current Mega is running four serial devices and all 40 or so additional i/o pins are already occupied, so submitting a picture of your setup wouldn't be a bad idea.My comment on reconfiguring on the fly probably still applies to the RN42, but I don't know anything about them.The reason why Bluetooth will not send any data to Arduino is most probably because you don't know what you are doing, and buying another Mega is not likely to fix that problem. You might not need to buy anything but, if you must, buy a 3.3v regulator for about $2 or, at most a couple of HC-05s, which run on 5v.
Please read the readmes at the head of the forum, particularly about posting pictures. As things are, I guess you will not be too surprised, when I tell you that pictures are just an incomprehensible mess. However, they do show very clearly a swag of unused pins, therefore suggesting there is no need to buy another Arduino.Once you have ensured that it is OK to run two Blueteeth off the 3.3v pin on mega, OR have come up with an alternative power arrangement, the connection process should be quite straightforward. You should be able to do it on a breadboard, remembering to put voltage dividers in the two Arduino Tx lines. The only explanations for your last para are inadequate power, incompetence or sloppiness. I suggest you get rid of all the motors for the moment, and whatever else is hanging around, and then try and send simple hellos from both blueteeth to the phone, they being on Serial1 and Serial2.It is not actually clear that you have ever successfully used bluetooth. If not, you might find the following notes useful, particularly in the matter of wiring.http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdfhttp://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino
I would maybe try and unplug the ports and see if anything works
Should I have any further questions, is it alright if I were to message you through the Arduino PM?
pl read this under python on using sensitive language.https://bugs.python.org/issue34605