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York Jong

SENSORS - SHARP IR RANGE FINDER - 0 views

www.societyofrobots.com/sensors_sharpirrange.shtml

ir range rangefinder sensor

shared by York Jong on 01 Jun 07 - Cached
  • The Sharp IR Range Finder works by the process of triangulation. A pulse of light (wavelength range of 850nm +/-70nm) is emitted and then reflected back (or not reflected at all). When the light returns it comes back at an angle that is dependent on the distance of the reflecting object. Triangulation works by detecting this reflected beam angle - by knowing the angle, distance can then be determined.
  • The IR range finder reciever has a special precision lens that transmits the reflected light onto an enclosed linear CCD array based on the triangulation angle.
  • The Sharp IR has a non-linear output. This means that as the distance increases linearly (by set increments), the analog output increases/decreases non-linearly.
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  • To effectively use your Sharp IR Range Finder, you must have a voltage output versus distance chart to reference from.
  • One major issue with the Sharp IR Range Finder and that is going below the minimum sensor range. This is when an object is so close the sensor cannot get an accurate reading, and it tells your robot that a really close object is really far.
  • Another issue is the high narrowness of the IR beam. In reading sharp details and getting high accuracy, a thin beam is ideal. But the problem with a thin beam is that if it is not pointed exactly at the object, the object is therefore invisible.
  • A more advanced use for the Sharp IR Range Finder is to do mapping. To do this, you need at least one Range Finder, and at least one non-modified servo.
  • The sharp IR can be used as a quick and easy front non-contact robot bumper on your robot. Just place two IR devices in front of your robot and cross beams as shown. Ideally you would perfer to use rangers that have wider beams. Note: A single sonar can do this job just as well.
  • For example, a box in front of your robot might appear like this: 0 0 0 0 0 106 120 124 121 109 0 0 0 0 0
York Jong

ROBOT SENSOR INTERPRETATION - 0 views

www.societyofrobots.com/sensors_interpret.shtml

robot sensor

shared by York Jong on 14 Jun 07 - Cached
  • how to interpret sensor data into a mathematical form readable by computers
  • There are only 3 steps you need to follow: Gather Sensor Data (data logging) Graph Sensor Data Generate Line Equation
  • Some sensors (such as sonar and Sharp IR) do not work properly at very close range
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  • The way to get rid of noise is get a bunch of readings, then only keep the average. Make sure you test for noise in the actual environment your robot will be in
  • York Jong on 14 Jun 07
     
    Most roboticists understand faily well how sensors work. They understand that most sensors give continuous readings over a particular range. Most usually understand the physics behind them as well, such as speed of sound for sonar or sun interference for IR. Yet most do not understand how to interpret sensor data into a mathematical form readable by computers.
York Jong

Trossen Robotics Offers Pleo Preorder - 0 views

pleobot.com/...-robotics-offers-pleo-preorder

calebchung pleo robot toy

shared by York Jong on 12 Aug 07 - Cached
  • Pleo Technical Specs: Ugobe LifeOS 32 bit Atmel ARM 7 microprocessor - The main processor for Pleo 16 bit sub processor - The processor dedicated to the camera system (4) 8 bit processors that provide the low-level motor control for the servos (35) Sensors including a camera custom designed to fit into Pleo’s very compact body. (4) foot-switches to detect footfalls and being picked up - assists with spatial orientation. (12) capacitive touch sensors (4) legs, (4) feet, back, shoulder, head, chin (2) microphones for directional sound detection (14) “Force” sensors, one per servo, to recognize abuse through force feedback joints. Orientation/tilt sensor IR transceiver for bidirectional data communication with other Pleos. IR interrupter for detection of objects in Pleo’s mouth (14) motors. Standard low voltage DC motors (150) gears and clutches Rechargeable NiMH battery pack USB port with mini USB connector SD/MMC memory card slot
York Jong

Maxibug, Minibug, Microbug - 0 views

home.wanadoo.nl/...maxibug.htm

5star 74x14 beam circuit diy electronics maxibug photopopper phototrope photovore robot tutorial

shared by York Jong on 27 May 07 - Cached
  • It is powered with two 3.3F Goldcaps. They can be charged in a few seconds. When they are charged, MAXIBUg gets "afraid" of light, and wanders of to go to play "in the dark". After a while, about 20 seconds (depending on the current used by the two motors ), the power has dropped, and it wants to "eat". It gets light attracted, and will turn and go to the light. When it gets there, it will recharge and still will be atrackted to the light until it reaches a trigger voltage , at which it gets "afraid"of the light again. This will go on all day until someone turns off the lightsource. While doing all this it also will backup when bumping into something.
  • Because of the "on-off" output of the first schmitt trigger, the inputs for the LDRs will switch. That's why it gets light atracted -light afraid. This also means that you cannot use IR diodes (like SHF205). You have to use LDRs !
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  • The change in output is visualised with two red LEDs. When the LEDs are burning, the bot is "afraid" of light. They are mounted as eyes off the bot, that's why I used two off them. One LED will do also, but doesn't look nice !
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