![]() ![]() Line follower tracks are often made with a black background and white line, or white with black tape. It is possible to get slightly better performance by making sure the LED/emitter and sensor are matched, usually you can get a good match just by getting parts with very similar peak wavelength. ![]() There are other things to consider with a line follower. This might provide enough power to work well using visible light (red) LEDs and sensors. You'll need some extra circuitry, for example a bipolar or MOSFET transistor to do this as it'll likely be well beyond the current rating of the Arduino. sheet for the IR LED, it'll give a value for the maximum pulse current, whicn may be as much as 10x more than the continuous current. You can make the illuminated measurement more effective by 'pulsing' a very high current through the IR LED (for a short time). A search should find good values for 'voltage divider' resistor.Īs Chris Stratton explained, you can take ADC measurements from the same sensor, one illuminated by an IR LED/emitter and the other measurement without IR illumination, then subtract to get the difference. ![]() To emphasise WhatRoughBeast's point, that infra-red and 'daylight' phototransistors are usually the same active, semiconductor, component embedded into plastic with daylight transparent or daylight filtering, these two phototransistors a SFH 300 and a SFH 300 FA have an almost identical specification.īoth types are compatible with an Arduino. ![]()
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