- #1
TuviaDaCat
- 85
- 1
im doing this home made project, the purpose is to build a robot which can find its location inside a room by doing triangulation to 3 Infra red beacons set inside the room.
the robot does the scanning by turning a photo sensor by a servo motor and it collects the brightest spots.
now after a lot of trial and error i have concluded to use both LED and phototransistor to find the bright spots. the photo transistor is very sensitive and gives me analog data(by POT) though it is also sensitive to bright reflections of ambient and flourescent light which makes it impossible to find the beacons. so i use a LED as a receptor because it is reactive only to the other infra LEDs as a digital component that tells me that i am in the vicinity of the beacon, and only then the phototransistor comes into action(by finding the brightest angle in that area).
now the thing is: the led is not sensitive enough, only sufficient to about 12 cm, and i need to improve the distance to two meters. i tried making an array of LEDs packed togather in a cascade, though it resulted in an odd manner which i could not explain...
so how can i improve the signal? or maybe anyone here has a better idea for a sensor to find the leds?(pass filters?)
the robot does the scanning by turning a photo sensor by a servo motor and it collects the brightest spots.
now after a lot of trial and error i have concluded to use both LED and phototransistor to find the bright spots. the photo transistor is very sensitive and gives me analog data(by POT) though it is also sensitive to bright reflections of ambient and flourescent light which makes it impossible to find the beacons. so i use a LED as a receptor because it is reactive only to the other infra LEDs as a digital component that tells me that i am in the vicinity of the beacon, and only then the phototransistor comes into action(by finding the brightest angle in that area).
now the thing is: the led is not sensitive enough, only sufficient to about 12 cm, and i need to improve the distance to two meters. i tried making an array of LEDs packed togather in a cascade, though it resulted in an odd manner which i could not explain...
so how can i improve the signal? or maybe anyone here has a better idea for a sensor to find the leds?(pass filters?)