MRCS-Optical-Detector
Ambiant light optical detector based on GBunza DAPD with Chubb style hysteresis
DFM, PTH parts, offboard detectors…
MRCS-Optical-Detector Version 1.1
First built: 2017-12
DFM, PTH parts, offboard detectors…
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UNPUBLISHED
Documentation
Optical Position Detectors are useful when precise position detection is required (clearing a staging throat, for example), when the area to be detected is small (an “OS” section in a CTC system) or where resistance wheel sets cannot be applied and current detection can’t be used. The Enhanced Optical Position Detector is based on Geoff Bunza’s DAPD and provides a fixed turn-on and turn-off delay and high power output stage similar to Bruce Chubb’s DCC-OD (so if you need an optical detector that’s electrically compatible with a cpOD or DCC-OD, EOPD is for you!).
The EOPD uses Geoff’s self-calibrating detection circuit, so you don’t need to adjust for ambient light level. Note the circuit won’t work in the dark unless you substitute infrared Photo transistors and provide an infrared illumination source. The supply voltage range is 5-15 volts and the output is a active low (0/gnd is true) open collector which will sink up to 600 mA at up to 40VDC. Size is 1.15” x 1.75 x 0.5” high”
Either 2 PT-19 photo transistors or “Da Fingah” will work with this board. One is used as an ambient light reference and another is placed between the rails. You may solder the reference photodetector onto the board if the board will be mounted where is has the same illumination as the track or both may be mounted remotely.
This detector is compatible with the Modular Signaling System (MSS) Optical Detector
doc
Optical Position Detectors are useful when precise position detection is required (clearing a staging throat, for example), when the area to be detected is small (an “OS” section in a CTC system) or where resistance wheel sets cannot be applied and current detection can’t be used. The Enhanced Optical Position Detector is based on Geoff Bunza’s DAPD and provides a fixed turn-on and turn-off delay and high power output stage similar to Bruce Chubb’s DCC-OD (so if you need an optical detector that’s electrically compatible with a cpOD or DCC-OD, EOPD is for you!).
The EOPD uses Geoff’s self-calibrating detection circuit, so you don’t need to adjust for ambient light level. Note the circuit won’t work in the dark unless you substitute infrared Photo transistors and provide an infrared illumination source. The supply voltage range is 5-15 volts and the output is a active low (0/gnd is true) open collector which will sink up to 600 mA at up to 40VDC. Size is 1.15” x 1.75 x 0.5” high”
Either 2 PT-19 photo transistors or “Da Fingah” will work with this board. One is used as an ambient light reference and another is placed between the rails. You may solder the reference photodetector onto the board if the board will be mounted where is has the same illumination as the track or both may be mounted remotely.
This detector is compatible with the Modular Signaling System (MSS) Optical Detector
This technical documentation is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike