how to make UNO R3 talk to FTDI USB port

Hello Members,
I am new to arduino and I am facing difficulty in making UNO R3 talk to a phone via FTDI USB connection. Following is the scenario, kindly advice where I am making mistake.

I can upload sketch from PC to UNO with supplied USB-A to B cable, and I can monitor output & give input's via serial monitor of the Arduino software - So Uno, cable and sketch are working.

Phone is programmed from PC with FTDI USB to serial cable by choosing appropriate COM port in PC. Please note USB side goes to PC and other end to phone.Connecting FTDI USB cable alone to PC shows COM port in device manager. So am assuming the phone and cable are also working.

Now to make UNO talk with phone, I connected UNO to DC power source that supplies 12v 1.5A, and I patched UNO programming cable with FTDI cable from phone using USB-A Female to Female adapter, thinking this should work since they both work independently with PC.

But, when I read about Tx and Rx to be crossed between devices - I do not know how to cross them between USB-A male cables. If D+ and D- of UNO USB are crossed with D- and D+ of FTDI, how about Vcc, do we need to connect Vcc of FTDI cable to UNO's 5v? Or do I need to use USB host shield or something else?

My objective is to make Arduino UNO USB side talk to the phone via FTDI USB to serial cable. Please advice. Thanks a lot.

a phone?

a smartphone?

which one exactly?

Phone is programmed from PC with FTDI USB to serial cable by choosing appropriate COM port in PC. Please note USB side goes to PC and other end to phone.Connecting FTDI USB cable alone to PC shows COM port in device manager. So am assuming the phone and cable are also working.
What the heck is this suppose to mean?

Programmed? How? What does "programmed" mean in this context?

What is that suppose to prove? ? ?

Gibberish in. Gibberish out!

.

Hi ieee488,

ieee488:
a phone?

a smartphone?

which one exactly?.

Sorry for that. Its not a smart phone, but an old Nokia phone.

ieee488:
Phone is programmed from PC with FTDI USB to serial cable by choosing appropriate COM port in PC. Please note USB side goes to PC and other end to phone.Connecting FTDI USB cable alone to PC shows COM port in device manager. So am assuming the phone and cable are also working.

What the heck is this suppose to mean?.

Here I meant to say is that the cable and phone are working while AT commands are sent via Hyperterminal.

ieee488:
Programmed? How? What does "programmed" mean in this context?.

Sorry again, what i meant by programmed is setting the initial configuration of phone to receive sms msgs via AT commands for turning light on and off.

ardulearner:
Sorry again, what i meant by programmed is setting the initial configuration of phone to receive sms msgs via AT commands for turning light on and off.

Again more gibberish.

I give up!

Good luck.

.

ieee488:
Again more gibberish.

I give up!

Good luck. .

You being an experienced member in this community, what gibberish is there in my above request / reply? There are project tutorials on using Arduino for turning light on or off with sms or managing devices with sms messages or similar. I was asking for a help to understand how serial adapter of phone with USB interface can be connected to Arduino UNO, so UNO can talk to the phone and phone can talk back to the UNO with response actions to SMS. What gibberish information you are missing to understand in this help request? Anyway, thanks for your time.

Your description of the connections is totally unclear.
What sort of a connection do you have on the Nokia for the PC? 3.3V or 5V TTL level serial?
Exactly how are you connecting the PC to the phone? Post a photo.

However two comments.

Any AT messages that you can type into Hyperterminal and somehow send to the phone, through an FTDI USB to Serial TTL level converter, can also be sent to the Arduino.

Verify this by using a simple serial echo program on the Arduino. You will need either another hardware serial port or a software serial port to handle program upload and another serial connection.

Any AT messages that you can type into Hyperterminal and send to the phone, through an FTDI USB to Serial TTL level converter, can also be sent by the Arduino to the phone. Likewise, the Arduino can read serial output from the phone, if the PC can. You do not need an FTDI USB to Serial converter for the connection, but you MUST make sure that the voltage levels are correct. Do NOT connect a 5V Arduino to a 3.3V serial input without using a level shifter. Connect the grounds, of course.

jremington:
Your description of the connections is totally unclear.
What sort of a connection do you have on the Nokia for the PC?. 3.3V or 5V TTL level serial?
Exactly how are you connecting the PC to the phone? Post a photo

Hi Senior, I am sorry for the unclear description.Let me try explaining again. Phone is connected to PC using a data cable that has pop-port pins on 1 side and USB on other side. When USB side of cable is connected to PC, it is recognized as COM4. Checking properties of COM port on Windows Device manager- it says, this is an FTDI device with VID 0403 and PID 6001.

jremington:
You do not need an FTDI USB to Serial converter for the connection, but you MUST make sure that the voltage levels are correct.

The phone data cable with pop-port and USB port - has a black box in the middle of cable without any label. I guess FTDI chip is inside this box. So there is no way I can remove the chip and connect phone. Is there anyway to know if the FTDI chip is using 3.3V or 5V? I googled, but not sure of the voltage for FTDI chip.

Using a USB host shield can make UNO talk to data cable?

The voltage on the phone data pins is almost certainly 3.3V. If so, you can connect those directly to RX/TX on a 3.3V Arduino and use a serial connection to communicate.

You could either cut the cable and expose the wires, or buy the "pop-port pin" connector, whatever that is.