> **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 # Gravity: Infrared Light Photo Interrupter Module (Wavelength 940nm) **Type:** Product page · **SKU:** DFR1129 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia) **Page:** https://core-electronics.com.au/gravity-infrared-light-photo-interrupter-module-wavelength-940nm.html ([markdown](https://core-electronics.com.au/gravity-infrared-light-photo-interrupter-module-wavelength-940nm.html.md)) Detects objects blocking light. Features ITR9608 photoelectric switch, 5.0mm photonic gap, rapid response. Ideal for counting, speed detection, and card... ## Pricing - **Price:** $4.45 (inc GST) — $4.05 AUD, exc GST - **Quantity discounts:** 6+ $3.85 (exc GST) · 12+ $3.68 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 2 today, and up to 500 more in 8–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=DFR1129:1` (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/DFR1129:1.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 The Gravity: Photo Interrupter Module integrates a high-performance ITR9608 photoelectric switch. Its compact design and easy operation make it an ideal choice for electronic projects and applications. Whether for [robotics](https://core-electronics.com.au/robotics.html), automation equipment, or counting systems, this module provides precise photoelectric detection and efficient signal processing. **What is the photo interrupter?** The photo interrupter is a device that operates by blocking light with an object. Its main components include a light emitter and a light receiver, both arranged face-to-face within the same enclosure. When an object passes through the light path between the emitter and receiver, the light at the receiver is obstructed, triggering the operation of the photoelectric sensor. ![Wiring Diagram of Gravity: Photo Interrupter Module and micro:bit](https://core-electronics.com.au/attachments/localcontent/microbit_993821ef8d2.png) Wiring Diagram of Gravity: Photo Interrupter Module and [micro:bit](https://core-electronics.com.au/micro-bit-v2-australia.html) ![Wiring Diagram of Gravity: Photo Interrupter Module and Arduino UNO](https://core-electronics.com.au/attachments/localcontent/Arduino_12538c1b51f.png) Wiring Diagram of Gravity: Photo Interrupter Module and Arduino UNO ### Features - High Sensitivity and Precision: Utilizing the ITR9608 slotted photoelectric switch. - Wide Photonic Gap: With a 5.0mm wide photonic gap design, it is suitable for detecting objects of various sizes. - Simple and Easy to Use: Designed with a standard Gravity interface,it offers easy operation and strong compatibility, making connections hassle-free. - Strong Compatibility: [Arduino](https://core-electronics.com.au/arduino/boards.html), [micro: bit](https://core-electronics.com.au/micro-bit-v2-australia.html), and [UNIHIKER](https://core-electronics.com.au/unihiker-iot-python-single-board-computer-with-touchscreen.html) ### Applications - Counter: Facilitates object counting on production lines. - Speed Detection and Measurement: Provides pulse signals for calculating rotation speed and frequency. - Smart Card Switch: Detects card insertion and removal for power control. - Printer and Copier Paper Detection: Controls printing and transmission by detecting paper position. ### Specification - Operating Voltage: 3.3~5V - Output Type: Digital Signal - Light Source Wavelength: 940nm (Infrared) - Photonic Gap: 5.0mm - Interface Type: PH2.0-3P - Product Dimensions: 27x32mm - Product Weight: 4.0g (total weight including packaging and sensor wire is 12g) ### Documents - [Product wiki](https://wiki.dfrobot.com/Gravity_Photo_Interrupter_Module_SKU_DFR1129) - [Pin Description](https://wiki.dfrobot.com/Gravity_Photo_Interrupter_Module_SKU_DFR1129#target_4) - [micro:bit Tutorial](https://wiki.dfrobot.com/Gravity_Photo_Interrupter_Module_SKU_DFR1129#target_5) - [Arduino Tutorial](https://wiki.dfrobot.com/Gravity_Photo_Interrupter_Module_SKU_DFR1129#target_6) - [UNIHIKER Tutorial](https://wiki.dfrobot.com/Gravity_Photo_Interrupter_Module_SKU_DFR1129#target_7) - [Schematic Diagram](https://core-electronics.com.au/attachments/localcontent/1da5805a03346ec2cb8f888ff97eb558_152066a2c12.jpg) - [Dimensional Drawing](https://core-electronics.com.au/attachments/localcontent/c6630d79a6a90565b30bbdaccb40ec6f_850523ead0e.png) ### Parts List - Gravity: Photo Interrupter Module x1 - Gravity: Digital Sensor Cable for Arduino - 30cm x1 ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/D/F/DFR1129-1.jpg)