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[SOLVED] programming and AT commands of ucontroller

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Vraj

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i have a chip of bluetooth receiver,
it can be programmed and commanded (AT)
i want to command it, it is having tx rx pins .any other pin is necessary for programming?

which pins required for programing?
 

Hi,

GND, RxD, TxD

Klaus
 
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txd needed to be connect or not?
in arduino, which settings i have to change?
vcc, gnd, tx rx any else is recommended or not?
 

Hi,

Sorry, i missed to type TxD. Now I added itin the post above.

Klaus
 
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If BT module is 3.3V type then you need a voltage translator between Arduino and BT module to convert Arduino Tx pin 5V to 3.3V level for BT Rx pin otherwise BT module will get damaged.
 
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i have arduino nano and mini.
buth has 5v and 3.3v.
mean? are they works on both voltages?
but for programming, i will use usb, which delivers it 5v that is the problem.

say, after programming, i removed the usb wire, and give it 3.3 v , then would it work?will all pin tx/rx/gpio will reach max. 3.3 voltage when they are high?

- - - Updated - - -

can i do like,

make the usb pins out, and convert 5v to 3.3v and then supply it on where 3.3v is marked on board and all other pins are as usual?
does other pins of usb also reaches to 5v?
 

Hi,

I'm not familiar with arduinos.
They use AVR microcontrollers (if I remember right). Most AVRs can operate at 3V3 and they operare with 5V0, in detail it depends on microcontroller type and it's oscillator frequency. Read datasheet.

Especially for the Arduino... you need to read it's datasheet. Maybe there are periferals with special power supply requirements.

But one is sure: if you reduce power supply voltage, this also reduces IO signal voltage.
Take care of brown out configuration.

Klaus
 

Arduino Nano works from 5V. I don't know if there is 3.3V version Nano. Arduino Mini comes in both 5V and 3.3V version. Use 3.3V version and you can directly connect the BT module to its UART pins.
 
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i have arduino mini, on back side, there is symbol of 5v and 3.3v both!
 

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