29 May GP2D12 sensor (Fig. 1) and its use, especially for dynamics application. I hope it will help robotists to avoid some pitfalls and make this sensor. 25 May Introduction. GP2D12 The Sharp GP2D12 is an analog distance sensor that uses infrared to detect an object between 10 cm and 80 cm. Line-up of distance output/distance judgement type. Distance output type (analog voltage): GP2D Detecting distance: 10 to 80cm. Distance judgement type.

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D1 prevents destroying the sensor in case of reverse connexion. Everything fits in 3 hollowed 4×2 bricks. Where to buy GP2D12? For more informations, read GP2D12 datasheet and Acroname article: Gp2d12 the only significant current diverted gp2d12 C1 charging is through R1 less gp2d12 2 mAand at the end of gl2d12 phase C1 is gp2d12 charged.

See oscilloscope captures here.

Q1 is blocked by D2 Gp2d12 maintains base to a voltage higher or equal to its emitter voltageso GP2D12 is gp2d12 powered. Gp2d12 small and rather inexpensive infrared devices are able to measure distance between 10 and 80 cm with reasonable precision and good immunity to variations of obstacles reflectivity and ambient light.

At such gp2d12 current, BC has a low gain, and since I couldn’t lower base resistor R1 main current drain gp2d12 capacitor charge I used a high performance Zetex transistor, ZTX gp2d12 offers high gain at high current other similar devices can work!


I long thought that a distance sensor would be a nice addition to Mindstorms robots, but ultrasonic ones were bulky and power hungry I’ve gp2d12 found Robot Electronics Ultrasonic Range Finder that can perhaps be usedand simple infrared method like the one I used in my radar car detects obstacles but don’t give true distance measurement.

GP2D12 requires 50 ms per measure, while my circuit needs ms Demystifying the Sharp IR Detectors. Gp2d12 switches power on and off for GP2D The gp2d12 module is build on a gp2d12 square proto-board.

I considered that someone able to build this sensor is also able to connect it in the right gp2d12 I used 1 Amp. Low drop gp2d12 U1 generates a 5V regulated supply.

Sharp IR Sensor – GP2D12 –

Andreas sensor interface has a few drawbacks gp2d12. My sensor began to work gp2d12 it, but exhibited strange behavior. During the following 50 ms, sensor is configured as a touch sensor passive. Shottky diode 1N for Gp2d12, inexpensive and readily available.

GP2D12 Project

With RCX current limitation, this hog eats all energy. Top view, with components identification. I was caught with this one For those gp2d12 want it, gp2f12 is the diagram with full bridge rectifier. The main gp2d12 to achieve this goal was quickly imagined: I didn’t use the full bridge rectifier used in Lego sensor that enables gp2d12 to work when connected backwards number of needed gp2d12 jumps from 3 to 8!


Component selection D1 prevents destroying the sensor in gp2d12 of reverse connexion. Building sensor interface module: At 35 mA current, Gp2d12 originally used gp2d12 plain-vanilla BC Its low forward drop foltage is less than 0. A notch in circuit is cut for big C1.

Q1 and Q3 hp2d12 then conducting, and GP2D12 is powered. Value read is proportionnal to inverse of gp2d12 with some offset see above old GP2D12 documentationyou can find here the Excel gp2d12 I used to find the equation gp2d12 raw values to centimeters.

GP2D12 old documentation, k. The solution came from Andreas Peter thanks Andreas for showing me these devices! Of course there is a penalty with gp2f12 technique: The GP2D02 he could find has a gp2d12 serial output not well gp2d12 to RCX analog input, thus requiring a rather complex design, big and power gp2d12.

GP2D12 fixations were cut to match Lego brick width. Take care with some gp2d12 drop regulators such as LM that require more than 25 mA when powered gp2d12 1V. So I decided to try to connect the analog output Gp2d12 sensor using the simplest vp2d12 possible – and gp2d12 only power coming from sensor input.