Usually the VCC is red and the GND is black, but the other colors may vary (though blue and orange are common). If you've found a good cell phone cable to use, you merely need to determine which wires are the VCC, GND, TX, and RX connections. One known chip is a MAX323 (yes, 323, the original MAX232 is a 5V device and we need 3.3V here). If you open up the cell phone cable's serial port casing and see a MAX# chip, it's probably the cable you need. Using an existing cable is much easier than building one. Many people already have such a cable laying around, or can buy one fairly cheap. Most cell phones need this same circuit to level-up for connection to a PC's serial port. Method A (reversible changes to Arduino board)Īnother great source for RS232- TTL converters is in cell phone serial cables. The outputs from this chip connect to the RX and TX pins on the microcontroller, and are generally suitable for use with other chips that operate at similar voltages.
Openwrt usb serial ftdi Pc#
I was unable to get this to work with a Arduino nano Clone with the CH340 usb serial chip.Ī PC typically communicates with an Arduino such as the Uno via a USB cable that enters the board via a chip that does USB - serial conversion to allow use of the microcontroller's serial interface. This technique works since the Arduino Uno REV3 has a chip called the atmega16U2, which is a serial to USB converter, to talk to the computer we use it here to talk to the router. This method uses the Development board's built in USB to RS232 converter and results in 5V signals.
That said, this technique worked well for me during for lots of use (hours), with a Linksys E1000 v1 at 3.3v, and an Arduino Uno REV3. Therefore, using the following technique may cause the router, Arduino, or other things, to malfunction or break. Caution: Do this at your own risk, since the Arduino runs at 5v and the serial sometimes is at a different voltage.
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