Yet another thought - how are you controlling this object? If you have a radio control system why can't you send data over the same link i.e. when the model senses there are no radio control commands been sent to it's receiver it can send data back to you - PWM etc. ************************************************* Roy Hopkins rdhopkins@ihug.co.nz ************************************************* --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.560 / Virus Database: 352 - Release Date: 8/01/2004 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu