> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Line Sensor Breakout - QRE1113 (Digital)

**Type:** Product page · **SKU:** ROB-09454 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/line-sensor-breakout-qre1113-digital.html ([markdown](https://core-electronics.com.au/line-sensor-breakout-qre1113-digital.html.md))

This version of the QRE1113 breakout board features a digital output, using a capacitor discharge circuit to measure the amount of reflection. This tiny board is perfect for line sensing when only digital I/O is available, and can be used in both 3.3V and 5V systems.

## Pricing

- **Price:** $7.50 (inc GST) — $6.82 AUD, exc GST
- **Quantity discounts:** 5+ $6.62 (exc GST) · 25+ $6.47 (exc GST) · 100+ $6.20 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 17 and Aug 24.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ROB-09454:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ROB-09454:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

This version of the QRE1113 breakout board features a digital output, using a capacitor discharge circuit to measure the amount of reflection. This tiny board is perfect for line sensing when only digital I/O is available, and can be used in both 3.3V and 5V systems.

 The board’s [QRE1113](https://core-electronics.com.au/search/?q=09542) IR reflectance sensor is comprised of two parts - an IR emitting LED and an IR sensitive phototransistor. When you apply power to the VCC and GND pins the IR LED inside the sensor will illuminate. A 100O resistor is on-board and placed in series with the LED to limit current. The output of the phototransistor is tied to a 10nF capacitor. The faster that capacitor discharges, the more reflective the surface is.

 These sensors are widely used in line following robots. White surfaces reflect more light than black, so, when directed towards a white surface, the capacitor will discharge faster than it would when pointed towards a black surface.

 The power input and output pins are brought out to a 3-pin, 0.1" pitch header. The board also has a single mounting hole if you want to screw it onto something.

 Sparkfun also have an [analog](https://core-electronics.com.au/search/?q=09453) version of this board.

**Dimensions:** 0.3x0.55"

**Features:**

- 5VDC operating voltage
- 25mA supply current
- Digital I/O compatible
- No ADC required
- Optimal sensing distance: 0.125" (3mm)
 
**Documents:**

- [Schematic](https://core-electronics.com.au/attachments/localcontent/QRE1113-Digital-Breakout-v11_72414c57bb.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/QRE1113-Digital-Breakout-v11_15720b60e7b.zip)
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/QR_QRE1113_2461996c76f.pdf) (QRE1113)
- Bildr Tutorial

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/l/i/line_sensor_breakout_-_qre1113__digital___rob-09454__01.jpg)