Pololu QTRX-HD-07A Reflectance Sensor Array: 7-Channel; 4mm Pitch; Analog [Discontinued] _RPI_CASE_AUDIO It is based on the

It is based on the Allegro A4988 stepper driver chip

The SparkFun RedBot is a great way to get your feet wet in the world of robotics

a shunt resistance of 4

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leaving them available for the other parts of your project

Pololu QTRX-HD-07A Reflectance Sensor Array: 7-Channel; 4mm Pitch; Analog [Discontinued] _RPI_CASE_AUDIO It is based on theThis Pololu IR LED phototransistor pair is great for precisely identifying changes in reflectance (like line detection). It operates from 2. 9 V to 5. 5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high reflectance objects are generally detectable out to around 40 mm. This version features a high performance, low current QTRX