CREATE TABLE table_name_21 (sensor VARCHAR(255), camera VARCHAR(255), output VARCHAR(255), sensor_resolution VARCHAR(255), cpu_usage VARCHAR(255))
What sensor has a resolution of 640x480 with small CPU usage, jpeg compressed output and a camera of sony playstation eyetoy?
    
SQL: SELECT sensor FROM table_name_21 WHERE sensor_resolution = "640x480" AND cpu_usage = "small" AND output = "jpeg compressed" AND camera = "sony playstation eyetoy"