Pololu

CA$5.89
This array of IR LED/phototransistor pairs 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 30 mm. This version features high-performance, low-current QTRX sensors with lenses.
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CA$5.89
This array of IR LED/phototransistor pairs 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 30 mm. This version features high-performance, low-current QTRX sensors with lenses.
Delivery within 2-3 weeks
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CA$5.75
5350-POLOLU A5984 Stepper Motor Driver Carrier, Fixed 500mA@5V / 330mA @3.3V This is a carrier board for Allegro’s A5984 microstepping bipolar...
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CA$5.75
5348-POLOLU A5984 Stepper Motor Driver Carrier, Fixed 750mA@5V / 500mA @3.3V This is a carrier board for Allegro’s A5984 microstepping bipolar...
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CA$5.67
This black anodized aluminum bracket lets you securely mount typical NEMA 14-size stepper motors to your project. The bracket features several slots and holes for a variety of mounting solutions, and four M3×5mm screws are included for securing the motor to the bracket.
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CA$5.47
These 2×10-pin housings work with our wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 5.
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CA$5.38
This black polyurethane scooter/skate wheel measures 84 mm in diameter and 24 mm in width and works with standard 608 bearings as well as our Aluminum Scooter Wheel Adapters, which allow these wheels to be used with an assortment of motors.
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CA$5.37

This tiny carrier board makes it easy to integrate the Sharp GP2Y0D810Z0F and GP2Y0D805Z0F digital distance sensors into your project.

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CA$5.37
This tiny DC motor has a shaft with an offset mass that vibrates when it rotates. Motors like this are commonly found in cell phones and other devices that use vibration for tactile feedback.
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CA$5.37
These 2×18-pin housings work with our wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 5.
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CA$5.01
This array of IR LED/phototransistor pairs 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 the traditional-style QTR sensors without lenses.
In stock
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CA$5.01
This array of IR LED/phototransistor pairs 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 the traditional-style QTR sensors without lenses.
Delivery within 2-3 weeks
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CA$4.98

This extra-tall stackable 40-pin female header features two rows of 20 pins spaced with a 0.1″ (2.54 mm) pitch. It includes three 0.1″-thick spacers for additional clearance, and the extended pins allow multiple units to be stacked as popularized on Arduino shields. 

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CA$4.95
This 40 cm (16″) cable has six 28 AWG wires and 6-pin female JST SH-type connectors on both ends. These connectors work with our Micro Metal Gearmotor Encoders with top-entry connectors and with side-entry connectors as well as our breakout boards with top-entry and side-entry connectors.
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CA$4.91
These 2×17-pin housings work with our wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 5.
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