Mindwave and arduino uno

i have arduino mega and uno. i could succesfully connect the mega and rn42 module and connect to my mega... but its not working in uno

i used serial1->> rn41 serial->> serial monitor in mega in uno serial-->> rn42 led--> output

i even tried powering from barrel connector. bt module is tranmsiting correctly. checked using serial ttl cable..

developer.neurosky.com/docs/lib/exe/fetch.php?media=mindwave_mobile_arduino_sample_code.docx used this code