2 layers132.1 × 45.7 mm
IPoS
peterheinrich/InternetOverSpaghetti
Transmitting IP packages over a pair of spaghetti thus demonstrating how media independent IP really is.
42 parts342
2 layers21.7 × 15.2 mm
A simple Infrared (IR) Sensor designed in KiCad using the LM358 operational amplifier as a comparator. The circuit detects nearby objects by transmitting infrared light and sensing its reflection.
- Size
- 21.7 × 15.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 7
- Pads
- 26
- Tracks, vias
- 51, 2
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Jun 2026
- Updated
- 26 Jun 2026
Overview
New2 is an open-source printed circuit board by Saroja-J, from the Saroja-J/IR-Sensor repository on GitHub. It is a 2-layer board of 21.7 × 15.2 mm with 11 parts on 7 nets, routed with 51 tracks and 2 vias.
It is built around the LM358. Its parts include 3 resistors, 3 diodes, 1 IC and 1 connector.
Main components
1README
README.md📡 IR Sensor using LM358 Comparator
A simple Infrared (IR) Sensor designed in KiCad using the LM358 operational amplifier as a comparator. The circuit detects nearby objects by transmitting infrared light and sensing its reflection. The received signal is compared with a reference voltage, and when an object is detected, the output changes state and the indicator LED turns ON. The detection sensitivity can be adjusted using a potentiometer, making the circuit suitable for applications such as obstacle detection, object counting, line-following robots, and automation projects.
📖 Overview
This project consists of an IR LED that continuously emits infrared light and a photodiode that receives the reflected IR light from nearby objects. The LM358 Op-Amp compares the photodiode's output with a reference voltage set by the potentiometer. If the reflected IR light is strong enough, the comparator output becomes HIGH, turning ON the output LED and providing a digital output signal. The adjustable potentiometer allows the sensing distance to be tuned according to the application.
📷 PCB Design
⚙️ How It Works
- A 5V DC supply powers the circuit.
- The IR LED emits infrared light continuously.
- When an object comes near, the IR light is reflected back to the photodiode.
- The photodiode converts the reflected light into a voltage.
- The LM358 compares this voltage with the reference voltage.
- If the reflected signal exceeds the set threshold, the output goes HIGH and the LED turns ON.
✨ Features
- ✔️ Infrared object detection
- ✔️ Adjustable sensing sensitivity
- ✔️ LM358 used as a comparator
- ✔️ LED indication for object detection
- ✔️ Simple and low-cost design
- ✔️ Designed using KiCad
🛠️ Components
| Component | Description |
|---|---|
| LM358 Op-Amp | Compares the sensor signal with the reference voltage and generates the output. |
| IR LED | Emits infrared light for object detection. |
| Photodiode | Detects the reflected infrared light from nearby objects. |
| Potentiometer (RV1) | Adjusts the sensing sensitivity. |
| Resistors (R1, R2, R3) | Limit current and help set the operating conditions of the circuit. |
| LED | Indicates when an object is detected. |
| 5V DC Supply | Powers the entire circuit. |
| Output Connector | Provides the digital output signal. |
📄 License
This project is intended for educational and learning purposes.
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | R_US | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | D_Photo | Diode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D2 |
| 1 | IR26-21C_L110_TR8 | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D3 |
| 1 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
| 1 | LM358 | Package_SO:MSOP-8_3x3mm_P0.65mm | U1 |
| 1 | R_Potentiometer_US | Potentiometer_SMD:Potentiometer_Bourns_3314G_Vertical | RV1 |
The 9 most common of 11 parts.
Questions
How big is the New2 PCB?
It measures 21.7 × 15.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the New2 use?
11 parts, built around the LM358. 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 New2 KiCad files?
From the Saroja-J/IR-Sensor repository on GitHub, at the commit this page was made from: the board is IR Sensor/New2.kicad_pcb and its schematic IR Sensor/New2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the New2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Saroja-J before reusing the design.
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