I found a webpage on hacking the Hot Wheels radar gun. I would like to use it on a robot for distance calculation outside in the sun and wind. I have tried to find info on what kind of distance I could measure with little success. If anyone has had a chance to mess with one and know its capabilities, I would appreciate a little help. I would like to measure a maximum distance of around 30 to 40 feet or 10 to 12m. A circuit implementing the gun for distance checks would be outstanding. Also, could one separate the tranmitter and reciever and make a beacon for use outside? This would be great since IR and ultra sound don't work well in the sun and wind respectively, at least not at a distance.