{"title":"SparkFun Line Sensor Breakout - QRE1113 (Digital)","handle":"sparkfun-line-sensor-breakout-qre1113-digital","url":"/products/sparkfun-line-sensor-breakout-qre1113-digital","description":"The SparkFun QRE1113 Line Sensor Breakout (Digital) is a compact IR reflectance sensor board that outputs a digital signal based on surface reflectivity. It uses a capacitor discharge circuit — the faster the 10 nF capacitor discharges, the more reflective the surface. This makes it straightforward to distinguish between light and dark surfaces using only a digital I/O pin.\n\nThe QRE1113 sensor contains an IR emitting LED and an IR-sensitive phototransistor, with a 100 Ω current-limiting resistor on board. White surfaces reflect more IR light and discharge the capacitor faster than dark surfaces, making this sensor ideal for line-following robots.\n\nKey Features\n\n\nDigital Output – Capacitor discharge timing; no ADC required\n\n3.3 V & 5 V Compatible – Works with both voltage levels\n\nCompact Board – 3-pin 0.1″ pitch header for easy breadboard or PCB connection\n\nMounting Hole – Single hole for secure mechanical attachment\n\nOn-Board Resistor – 100 Ω series resistor for the IR LED\n\n\nIdeal For\n\nLine-following robots\nEdge detection on tabletop robots\nSurface reflectivity sensing\n\n\nPackage Contents\n\n1× SparkFun QRE1113 Line Sensor Breakout (Digital)\n","vendor":"SparkFun","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":14157,"title":"Default Title","sku":"SF-ROB-09454","price":8.85,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":159,"option1":"Default Title"}]}