All Questions
16
questions
0
votes
1
answer
181
views
Laser tag IR LED beam reflection problem
I built a laser tag gun using an Arduino,but there is a problem. When I use it indoors with lens or without I have beam reflections. If I shoot on the wall the receiver also claims a "hit." ...
- 29
-1
votes
2
answers
517
views
Why did cars switch from infrared key fobs to radio-wave key fobs? [closed]
Is an RFID key fob less likely to have its signal blocked? Or is it longer range? Or can it be made smaller, or cheaper?
Also, how do infrared devices generate an infrared signal? With an infrared-...
- 231
0
votes
1
answer
208
views
Thermostat for induction heater with small coil
I bought a ZVS 1000w induction heater
I would like to control it with a thermostat in order to control the temperature of my steel piece.
I hold the piece with a clamp and I don't want to put a ...
- 341
0
votes
1
answer
232
views
How to detect obstacles (Tripwire with Laser, IR or similar)
Supposing I have a glass sheet 50cm x 30cm, with 10 holes (2 lines x 5 columns), with metal/plastic (i can chose) pins inside it. They can be flush (hidden in the hole) or salient (extending 2mm above,...
- 103
0
votes
1
answer
95
views
Vehicle tracking and direction processing
Im trying to find a good way for tracking vehicles. Its like counting all the vehicles (cars, motor cycle or any vehicles)through a point on the road. Also it needs to count like how many in total and ...
- 669
0
votes
1
answer
3k
views
Any way to measure distance through water?
I have a barrel of clear liquid which has sediment build up at the bottom of a barrel. Over time I want to measure the build up of this sediment. Nothing can touch the liquid and I can't place ...
- 155
3
votes
5
answers
2k
views
What type of photo sensor/light combo best for detecting a falling drop of water?
I am trying to setup a rig for water drop photography. This is where you take a picture as a water drop is impacting against another object or body of water. The trick is to detect the drop as it ...
- 935
0
votes
2
answers
2k
views
A question about ultrasonic sensors in general
Do ultrasonic sensors send out waves in a straight line, all the way to a reflecting substance (if any) and get reflected in the same line back to the receiver?
Or do they send out a wave which ...
- 123
3
votes
2
answers
801
views
Under water distance measurement
For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high ...
- 31
0
votes
2
answers
412
views
What are some LED technology for one dimensional coherent light emission?
I need to emit a unidirectional infrared pattern, i.e. the emission cone should have small angle on one dimension and large angle on the other one (basically laser-like in one dimension and normal ...
- 355
0
votes
1
answer
293
views
Safe line IR laser which will be seen from 15 meters by camera module
What characteristics (wavelength, mW) IR line laser should have to:
be seen by camera module from 15 meters outdoor in day-light too
safe for eyes
line as big as possible
thickness of line should be ...
- 123
0
votes
1
answer
272
views
Detecting Multiple Lasers
I'm looking to design a game where players fire a gun at a target using LASERS or IR. The target only registers a hit when a certain amount of players (say 3) are hitting the target consistantly for ...
- 91
5
votes
1
answer
6k
views
Can I use a 940nm laser diode for a remote control?
Most TV remotes use 940-950nm LEDs. The TV-B-Gone uses a combination of short ranged, wide output and long ranged, narrow output LEDs, to have a combination of easy mark hitting and longer range.
Say ...
- 153
2
votes
1
answer
7k
views
How do I build a laser/IR target?
I am trying to make a "laser gun range" like the ones you see at carnivals for my embedded systems class at school. However, I am having trouble because I do not know how to construct the "target". I ...
- 21
2
votes
3
answers
342
views
Is a class I infra red laser range finder with range 30-40 metres possible?
For our warehouse, we need to build a range finder for monitoring purposes. We have the following constraints:
Use infra red lasers only
Range should be at least 30 metres
Only class 1 lasers ...
- 21