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Forum Index : Microcontroller and PC projects : Problem with ultrasonic range
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| WhiteWizzard Guru  Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Hi Greg, Have you tried pointing the unit at a wall around 3.5 metres away (and no chairs or anything else potentially in the way). I was able to get up to 3.9 metres very consistently with my module (which is exactly the same layout as the one in Franks photo). Just that the 2.8meters you are peaking at seems a little too short of the claimed 4.5m. I did find that if objects were in the potential 'line-of-sight' of the module then the reading became rather erratic - guess that should be expected. The other word of warning as I previously posted is NOT to try detect/measure an object which absorbs UltraSonic. Seems an obvious thing to say but I kept wondering how my wife kept coming into the room without her being seen by the unit. Turned out it was her 'fluffy' dressing gown absorbing all waves and a value of -1 being returned whenever she approached. Bearing in mind the unit was pointing into free space (and hence already returning -1) it gave the effect that she was undetectable! The problem was immediately solved by removing her gown . . . . .  |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
Who removed it? 
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vasi Guru Joined: 23/03/2007 Location: RomaniaPosts: 1697 |
Now you can sell her gown on e-bay as a cloaking unit. https://www.youtube.com/watch?v=3V1PwpoDqzM Or maybe not... Hobbit name: Togo Toadfoot of Frogmorton Elvish name: Mablung Miriel Beyound Arduino Lang |
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| Grassy Newbie  Joined: 06/07/2014 Location: AustraliaPosts: 12 |
I recently bought 2 of the cheap eBay HC-SR04 ultrasonic modules hoping they would be ok with the Micromite. Unfortunately they both seem to be limited to a distance of around 70cm. I have tested them in the open by slowly moving a large sheet of cardboard away until the distance reading didn't increase any more. One works to a maximum of around 70 cm while the other works to about 85 cm but then the readings get very unstable. I found this thread after doing a search on the forums and have tried TassyJim's tester program as well but get exactly the same results. NB I had to increase the trigger width substantially to around 6ms as noted elsewhere to get it to work. I can only assume as has been pointed out many times before on this forum that you get what you pay for. As my project requires a distance measurement of at least 3 meters, can I ask if anyone can recommend a good quality sensor that is known to work up to at least this distance. Tony |
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| Bizzie Senior Member  Joined: 06/07/2014 Location: AustraliaPosts: 192 |
I bought similar units from Ebay. They work fine to 2.5m I have not tested them beyond that as my application only required less than 1m. 3m is the limit of these sensors from what I have read. These sensors look good but much more expensive - Distance sensor Rob White |
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