Posts tagged ‘voltage’


Sparkfun FTDI 3.3V or 5V

I noticed that Sparkfun sells FTDI breakouts in two configurations: 5V and 3.3V.

I have an old one and a new one, both 3.3V. One thing I noticed is that the new one had 3 solder points on the far side so I started investigating and realized that this is the voltage selector.

There are several reason why you would want to change the voltage, specially if you have two of them. For me, the reason was that my LCD screen is 5V and I didn’t want to alternate an external power source and the FTDI to upload the program and testing it.

Both look the same, difference is on the far side.

So, if you want to change the voltage of you FTDI breakout all you have to do is connect the solder points. If are seeing the board with the USB on to the left, connecting the top and the middle points provides 5V; on the same way, if you connect the bottom point with the middle you get 3.3V. Make sure you break the existing connection with a knife to avoid a short circuit.

Converted FTDI. A drop of solder will do.

Happy coding!