2 layers373.4 × 34.5 mm
2 layers128.3 × 17.5 mm
QRE1113-Array
SendhanS/QRE1113-7-Sensor-arrayThis repository contains the design files for a 7-channel QRE1113-based infrared line sensor array intended for line follower robots. The PCB uses a slight arc layout on a planar board, operates at a 5 V supply, and provides individual analog outputs for each sensor, suitable for high-speed line tracking and control algorithms.
- Size
- 128.3 × 17.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 16
- Pads
- 65
- Tracks, vias
- 116, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 17 Jan 2026
- Updated
- 17 Jan 2026
Overview
QRE1113-Array is an open-source printed circuit board by SendhanS, from the SendhanS/QRE1113-7-Sensor-array repository on GitHub, published under the MIT licence. It is a 2-layer board of 128.3 × 17.5 mm with 23 parts on 16 nets, routed with 116 tracks and 0 vias.
It is built around the QRE1113. Its parts include 14 resistors, 7 ICs and 1 connector. It belongs with the sensors and measurement and robots and motor control boards of this library.
Main components
1README
README.mdQRE1113-7-Sensor-array
This repository contains the complete schematic and PCB design files for a 7-channel QRE1113-based infrared reflectance sensor array intended for competitive line follower robots.
The design operates on a 5 V supply and provides individual analog outputs for each sensor, enabling precise line position estimation using ADC-based processing and PID control algorithms. The sensors are arranged in a slight arc geometry on a planar PCB, improving curve anticipation and stability at higher speeds compared to a straight-line array.
Key Features
- 7 × QRE1113 IR reflectance sensors
- 5 V operating voltage
- Independent analog output per sensor
- Curved (arc) sensor layout on a flat PCB
- Optimized for fast and stable line tracking
- Suitable for ADC-based control systems
Intended Applications
- Line follower robots (educational and competitive)
- Robotics research and prototyping
- Embedded systems and control algorithm development
Design Notes
- The circuit is designed specifically for 5 V systems
- Output signals are analog and should be read using an ADC
- Sensor spacing and arc curvature are chosen to balance resolution and look-ahead for typical competition tracks
- The design has passed DRC checks and is ready for fabrication if required
Repository Contents
- Schematic files
- PCB layout files
- Manufacturing outputs (if generated)
- Documentation and reference material
Images
This project is intended for learning, experimentation, and portfolio demonstration.
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R3, R5, R7, R9, R11, R13 |
| 7 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R4, R6, R8, R10, R12, R14 |
| 7 | QRE1113 | OptoDevice:OnSemi_CASE100AQ | U1, U2, U3, U4, U5, U6, U7 |
| 1 | Conn_01x09_Socket | Connector_PinSocket_2.54mm:PinSocket_1x09_P2.54mm_Vertical | J1 |
| 1 | LOGO | LOGO | G*** |
Questions
How big is the QRE1113-Array PCB?
It measures 128.3 × 17.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the QRE1113-Array use?
23 parts, built around the QRE1113. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the QRE1113-Array KiCad files?
From the SendhanS/QRE1113-7-Sensor-array repository on GitHub, at the commit this page was made from: the board is Project_files/QRE1113-Array.kicad_pcb and its schematic Project_files/QRE1113-Array.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the QRE1113-Array design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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