IR detector is an 8-input PCB allowing to sample signals from IR receiver transistors. IR LED & IR fototransistor is placed near each other. This PCB detects when signal fro emitter is received on receiver. It sends pulses to emitter and checks for these pulses on inputs pins. Main aim of this PCB is to smartly process signal from IR inputs so environment has no effect on inputs states (e.g. intensity of lights).

This repository contains schematics & PCB layout of IRDET PCB. Firmware for main MCU is available here.

Schematics & PCB are designed in Eagle 9.

PCB is prepared to be automatically assembled in JLCPCB. SMD parts on bottom side should be assembled. Each SMD part has its LCSC_ITEM attribute set.

Black silkscreen colour is advised.

• Input voltage: 7–17 V. Protection: when > 18 V is applied, input is shorted. Afterwards, current is limited by PTC fuse on input to 200 mA. Changed-polarity protection.
• Max current consumption: 150 mA.
• Inputs: up to 8 IRs. Any number of IRs can be connected. Pulled up to +5 V internally. Capacitive coupling is used on inputs. No over-voltage protection.
• IR LEDs: driver for each pair of IR LEDs. Short peaks of 100 mA stable current.
• Logic outputs: galvanically separated from rest of PCB.

The module is designed by Jan Horáček, Model Railway Club Brno.

Content of the repository is provided under Creative Commons Attribution-ShareAlike 4.0 License as openhardware project. You may download any data, contribute to the project, create PCB yourself or even sell it yourself.