Niwaka or FITSAT-1 is a 1U CubeSat satellite deployed from the International Space Station (ISS) on 4 October 2012.

The Niwaka satellite includes high power LEDs which are driven by 200 watts pulses, allowing Morse code style communication from the sky to the ground.

[1] FITSAT-1 (Niwaka) communicates with ground by means of 5.8 GHz high-speed (115200 bit/s) transmitter.

It also has a 437 MHz (amateur band) beacon and transmitter with data rate 1200 bit/s for telemetry downlink.

[2] WE WISH, RAIKO, FITSAT-1, F-1, and TechEdSat-1 travelled to orbit aboard Kounotori 3 (HTV-3).