This project is "CW keyer" utilizing a Teensy microController. You connect a Straight or Iambic A/B paddle to the microController. A (piezo) buzzer produces the latency-free side tone. Adding a low-pass filter you can enhance the audio quality and connect some speakers. Different from other CW controllers: The controller is also connected to the (Windows) PC; in this case all keys are reported to the PC via HID USB connection. You don't need a driver :-) Intention is to use that information for a CW training program or an SDR transceiver software. Besides that info, you can configure CW speed, tone frequencies, etc. from PC. HARDWARE PARTLIST: * 1 x Teensy 3.1 with pins (you should be able to other another Teensy model with enough pins) https://www.pjrc.com/store/teensy31.html http://www.watterott.com/de/Teensy-USB-Board-v31-MK20DX256VLH7-mit-Pins for overview, see https://www.pjrc.com/teensy/index.html * 1 x small Breadboard http://www.pollin.de/shop/dt/MDM2OTg0OTk- http://www.watterott.com/de/Breadboard-klein-selbstklebend * 1 x Iambic Dual Paddle, e.g. http://www.mfjenterprises.com/Product.php?productid=MFJ-564B * 1 x Piezo buzzer, e.g. http://www.reichelt.de/SUMMER-EPM-121/3/index.html?&ARTICLE=35927 http://www.ekulit.com/piezo-buzzer-without-controller/rmp-14pht/ * some Jumper Wirers M/M http://www.watterott.com/de/Jumper-Wires-MM-200mm SOFTWARE PREREQUISITES for Development/Microcontroller Upload: * Arduino 1.8.2 / Genuino with Teensyduino 1.36 https://www.pjrc.com/teensy/td_download.html SOFTWARE PREREQUISITES for Development/PC Control: * Visual Studio Express 2013 for Windows Desktop - or higher version. With minor modification you should also be able to use other compiler. https://www.microsoft.com/en-us/download/details.aspx?id=44914 LICENSE: MIT, (c)2017 Hayati Ayguen <h_ayguen@web.de> exception: - Teensy RawHID source files see http://www.pjrc.com/teensy/rawhid.html