Hi, again, wy using 14 chanels for RC controling ? if you manage to send the data at some considerable speed you can send RS-232 or even your own comands and then back at the robot control the stuff, remember that the data in the processor is being processed at an very high speed it won't make that much diference !
An good example for you is like having a 14 bits ( parallel ) port working at 1Khz and 1 serial pin working at 14 Khz and even having the micro controler controling the hardware :\ what's the fuss ?! this way can be even better than having that mutch channels :\, and you don't need too mutch speed for controling stuff, wy don't you try 2 channels, one for data and the other for rc comands ?! It can also be a problem to find 14 channel transmitters even if there is one.
My guess is that you should take a look at the baud rates and then re-think :lol:, RS-232 sends data so fast that 14 bits will arrive in no time man.
oH with distance 14 channels might get a little mixed :lol: if not, the error processing system of the module, if any, will take even more time to fix the data :? have you ever tought abouth all that ???


Well, i hope i had put some lights on :lol: , cya

 

Hey I am Portuguese to I am full blooded, Any way I want this to be mobile and not connected to a computer, I want a hand held device which will control the robot.

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Robotics is heaven in my book.

 

You are Portuguese ? There in USA ? You must get me some place to stay there someday, i could give a look at the states
Well, handheld you shall i guess that most handhelds have and RS-232 micro conector somewhere :? i saw that once, but if not then i am mistaken...
But give it a look.

I had a great ideia too :idea: just check this out :
1x BlueTooth USB Dongle
1x MIcroControler (PIC?) w/USB to control all or one USB to RS-232 Module
1x HandHeld w/BlueTooth

Like this you could not only spare money, but you could make a incredible small RC system with at minimum 10 Mtrs, but BluTooth v1.2 gets to 200Mtrs, the only problem is the programming needed :? i don't know how good you are with that... but here is the bet ideia you could get :lol:

 

I want a remote control with a POT joystick and some flip and push buttons. Also I stated that I wanted to use RF only.

__________________
Robotics is heaven in my book.

 

I didnt quite get you. By 14 channels, did you mean you want to get 14 bits across at once ?
DTMF can help you get 4 bits across at once (i.e. 4 bits per 42 microseconds I guess). If thats good enough for you then you can
serialise your data and send or you can make 4 DTMF pairs to get 16 bits across at a time.

You can also look at the chips like HT12D and HT12E and others in that series from Holtek. But depends on whether you need 14 analogue channels or digital(binary) channels.

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Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect
----- Pradeep K. Shima -----

 

I am just putting together a radio transmitter and receiver to control some camera gear - I'm using a microcontroller to read and encode a 7 by 8 keyboard matrix and send an RS232 code to the radio transmitter. The receiver passes this code to a second microcontroller which decides what the code means - energising one of 18 relays or sending a command string to a video multiplexer via an RS485 link. I am hoping to get a range of about 100 metres out of the radio link when it's finished (through walls and trees).

The radio modules I am using are from EasyRadio (they take RS232 directly, nice and easy, and LEGAL in the UK and Europe)
http://www.lprs.co.uk/main/product.i...?productid=154

This sounds something like whay you want ? to add an analogue joystick would just mean a bit more code for the microcontroller to read its A to D port. I only need to transmit a keycode when a key is pressed or released, you may want to transmit everything 20 times a second or something - depending on robot speed, accuracy, amount of data you want to send ???

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I need a memory upgrade ...
My head is full !

 

I want this to be protable, like a handheld device and nothing to big.

I am limited on space.

__________________
Robotics is heaven in my book.

 

What you could do is buy two FRS radios (they have exactly 14 channels, but you will only need one) off of Ebay (You can get them for REALLY cheap).

Next rip their insides out so that they take up less space. Then, if you are using a microcontroller, you can use the microcontroller to send DTMF tones through the radio (i.e. hook the PIC up to the mic in jack, or to the actual internal microphone).

You have DTMF tones 0 to 9 which you could transmit over the radio and each tone could represent a different command. If you wanted more commads you could use more than one DTMF tone at a time.

On the recieving end you could hook a second microcontroller up to the second radio's speaker out jack (or just take the two wires that go to the internal speaker) and program the microcontroller to do whatever depending on the DTMF codes.

I also suspect that there is a way (though not readily apparent to me) that you could simply send RS-232 over the radio.

I hope I've been clear and that this is helpfull. If you have any questions e-mail me at: micah.hurd@gmail.com