USB To TTL Serie for Arduino Converter

Module Description USB To TTL Serie for Arduino Converter

USB to TTL converter Serial using an FT232RL chip from FTDI compatible with Arduino, mikroElektronika, etc ...
generally compatible with any micro-controller-based system, whatever it is ...
It thus allows to '' add a pseudo RS232-type serial interface to a prototype and thus be able to communicate with a terminal ( I use the Bray one, very practical ... ) via the UART of a microcontroller.

I also thought to use it to load a program via the Bootloader of a microcontroller, but this module does not want to communicate correctly with mikroBootloader( v2.1.0.0 ), which I use frequently ... There must be a problem, but I don't know where yet ... to follow ...
um ... um ... it seems to be decided to work after a few inconclusive tests ... could it be a capacitive problem with the Breadboard? to see ...
or simply a small false contact at the level of the quartz support on the Ready for PIC board ?

no actually none of that, it was enough to set up the mikroBootloader interface correctly, as follows:

  • COM Port: COM7 ( it is indeed this port which was assigned by Windows to the FTDI chip ... )
  • Baud Rate: 115200 (this is the correct rate for the Bootloader embedded on my microcontroller ... )
  • Data bits: 8
  • Stop bits: 1
  • Parity: None
  • Flow control: None ( this is where my mistake was ... )


Chip : FT232RL

1 x LED indicating the presence of the supply voltage
2 x LEDs indicating the communication of the transceiver RxD / TxD
Power supplied by the USB port, possibility of selecting the output voltage VCC on + 5V / +3 , 3V thanks to a jumper

Connectivity :

  • 1 x 6-pin male connector ( supplied already soldered ): DTR / RxD / TxD / VCC / CTS / GND
  • 1 x 9 pins connector: GND / TXLed / RXLed / + 5V- / + 3.3V / CTS / SLEEP / TEN / PWREN
  • 1 x 9 pins connector: TxD / DTR / RTS / VCC / RxD / RI / GND / RSD / DCD

→ For these last 2 connectors, I soldered male snap-off strips ( not supplied ) in order to be able to insert the module on a "Breadboard" type plate, see photo at the bottom of the page

Pitch : 2.54mm
Dimensions : 36 x 18mm (W x D)
Interface : Mini USB
OS version : tested on Windows 7 Home Premium, and Windows 10 Home version without any problem


Precaution to take :anti-static bracelet

When I soldered on one of my modules ( I ordered 3 ... ) the breakable strips in order to be able to use it on a "Breadboard" plate, I forgot a very important thing ... static electricity!
And yet I knew it, I am continuously charged, and not just a little ... I have already happened on several occasions during my troubleshooting, on camcorders in particular, to burn fragile components such as microprocessors, memories and others ... However,
I have an antistatic bracelet that I connect to the terminal of my Weller WECP-20 soldering iron, but here it is ... I forgot to put it ... and the FT232 FTDI chip is now HS, it no longer communicates with the outside world ... unfortunate!
However, I just had to open my drawer to use it ...

So a word of advice, if you have one use it, if not, you'll have to buy one, it doesn't cost too much, and it's really effective.
In this regard, I only have the bracelet, and no table mat or antistatic floor ... but that's already good, it simply allows to have the equipotentiality between your wrist and the tip of your soldering iron, and if possible to the ground of the circuit on which you are working ( provided you can connect it, that goes without saying ... )

This precaution does not only apply to this FTDI chip, but also to any CMOS component for example, and many others ... if in doubt, only one solution: put on the antistatic bracelet!


USB Device Detection:

Here is how this module is detected, with " USB View " it gives this:

view the content device with USB View ... The module is well recognized, and has the following number:
[Loc3132] DeviceConnected: USB Serial Converter
view and modify the content device with FTDI - FT Prog ... 

It is with this utility downloaded on the FTDI site that I modified the name of the Device as follows:
"FT232R USB UART - module for Arduino", the original name being:

→ I bought this module here in December 2015 for € 1.58 ( free shipping ), it's really not worth doing without!

Schematic diagram of the module that I redesigned under Eagle: Download button

USB TTL Converter Arduino Series USB To TTL Serie for Arduino converter - view of connectors USB To TTL Serie for Arduino Converter - on Breadboard

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