# Inexpensive lidar/radar rangefinder good up to 100m? [closed]

I've been looking around for a lidar/radar rangefinder for a few months now and can't seem to find anything reasonable for my application. My requirements are pretty straightforward:

1. 100m range
2. I2C or other serial protocol
3. Accuracy +/- 0.25m
4. Sampling > 50hz

This isn't a spinning/mapping application, so sampling rate isn't very demanding, and I don't think I'm asking much regarding accuracy, but I can't find anything for less than $600. It seems like there's a bit of a hole in the market? The closest ive come is the lidar lite from pulsed lite (now Garmin), but its only good up to 40m, and I've had one backordered for 4 months now! If they offered this product in an 80 or even 60m application it would help me, but 40m isnt quite enough. I would assume the technology/demand just isn't out there that anyone is cheaply Producing this device, but I see lots of lidar based rangefinders for golf courses/gun sitting/etc that are around$100 in price and work in these ranges. What's different about these technologies? Example. What technology does this use and are there sensors out there that I can buy direct?

Thanks

Also found this, but seems specific to altimeters. Is there something about this device that would only make it applicable for drone altimeter applications? I know there must be considerations for the incoming environmental light and reflectiveness of the surface it's detecting,so possibility it wouldn't work in an outside application where environmental lighting will vary? And also this device doesn't call itself 'lidar', so let's ask a very basic question:

Are all laser rangefinders considered 'lidar'? Surprisingly I haven't found this answer.

• Welcome to Robotics, NateGreco. This is a shopping question (where can I buy X), which are not allowed because products and suppliers are prone to change with time, meaning that a valid answer now is of no use to someone visiting the site a year or five from now. Sep 28 '16 at 13:09
• I'll say that, while you have some specifications, you haven't given all of the specifications. You say LIDAR, and the connotation with that word is that you are looking for (at least) one plane of laser data. With that plane you have to specify a field of view and an angular resolution between individual scan rays. If you're picky (you should be, if you're designing the system), you should also look at the angular divergence (spread) of the laser dot. You haven't specified field of view or angular resolution, which makes me wonder if you're just looking for a laser rangefinder. Sep 28 '16 at 13:12
• As a final comment, if you Google "serial laser rangefinder" you'll find several listings on eBay at the moment for single-point laser rangefinders that have a listed accuracy of +/-1mm and a max range of 100m, for about \$70. Sep 28 '16 at 13:17
• Indeed, I am only looking for a rangefinder. And although the topic was marked for opinion regarding buying, I do have some technical questions still; what's the difference between the rangefinder technology vs lidar? Is it o ly just the application of a rangefinder with a narrow spread Incorporated with some rotary movement for mapping? Oct 2 '16 at 1:26
• Yes, generally a "rangefinder" is a single-point measurement where a "lidar" is a multi-point measurement. Oct 3 '16 at 15:32