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Interfacing the IS471F distance Sensor

The IS47iF is an easy to use distance sensor. All you need beside the sensor is an infrared LED. The IS471F reacts on obstacles in a distance of 7 to 10 cm. The LED output of the IS471F delivers a modulated signal, so you dont have to worry about other light sources. The IS471F drives a current of 50 mA through the LED, thats no problem with a 20 mA LED, because the LED is pulsed. If you use a transistor to amplify the signal you can drive much higher currents throug the LED an can reach higher distances. The IS471F works with a digital output which is TTL compatible. That means you can only see if there is something or not but you canīt see how near or far it is. I used the IS471F on both of my robots and Iīm realy satisfied with it. You have to take care to shield the LED from the sensor so that no direct light gets on it. The IS471F works with different frequencies to modulate the IR light but sometimes they have nearly the same frequency and they are influencing each other if they are mounted to close to eachother. Interfacing the S471F to a microcontroller is quiet easy as shown in the following picture.

More information about he SHARP S471F can be found in the datasheet


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