USB to TTL Serial Adapter with 3.3V, 5V & ICSP

The JKD USB board is designed with compatibility in mind.  It is based off the popular FT232.  Unlike many other USB to TTL adapters, the JKD USB has an on-board 3.3 volt regulator.  By setting the on-board jumper you can set your I/O to be either 5V or 3.3V compatible.  When powering devices with 3.3V you don't need to worry about the 50mA limit from the FT232 since there is an on-board 3.3V regulator.  The I/O reference voltage can also be supplied with other voltages by removing the on-board jumper and supplying the middle pin of JP1 with the desired I/O voltage.

There are two headers available that allow re-mapping of the I/O pins.  The standard configuration is similar to other USB to TTL adapters allowing you to connect directly to most Arduino compatible boards on the market.

An additional 2x3 header is available to allow bit-bang programming of Arduino compatible devices.  The pin-out of this header is compatible with the Atmel 2x6 ICSP programming header.

Features include

• FT232
• 3.3V operation up to 500mA
• 5V operation up to 500mA
• ICSP programming via bit-bang header
• Adjustable I/O reference voltage
• Industry common pin mapping
• Re-mappable pins... cut the traces for the second set of pins to remap them
• Includes one 6 pin right angle female header
• Includes one 6 pin male header
• Includes one 2x3 pin male header

Using the Bit-Bang ICSP Connector with Avrdude

You must be using a version of Avrdude that supports the FT245R driver.  You can get more information on this here

After following the instructions at the link above, you will need to add the settings below to your avrdude.conf file

programmer
  id    = "jkdusb";
  desc  = "ft232 bitbanging";
  type  = ft245r;
  reset = 3;
  sck   = 6;
  mosi  = 5;
  miso  = 7;
;

You can then specify "jkdusb" as your programmer when using Avrdude.