Spider Keyer Kit
Assembly Instructions

Important:
Some clones of Arduino Nano units claim they use FTDI UART chip FT232RL. In fact it is not the genuine chip from FTDI company but a Chinese counterfeit. The original drivers refuse to communicate with these faked chips! Avoid using such units.
On the other hand the Chinese Arduino Nano clones that use CH340 UART seem to be very reliable for a low price. They can be purchased as cheap as about $3.00 on eBay.