Fig 5 - available via license: Creative Commons Attribution 4.0 International
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Diagram of the top side of the PCB, showing component orientations and values. The two components soldered to the underside of the PCB (DIP socket for OPT101 and 30 mA LED driver) are marked with yellow boxes.
Source publication
We report a sensitive, fixed-wavelength, lock-in-based optical detector built from a light-emitting diode, two colour filters, a photodetector, a small number of discrete analogue components, and a low-cost microcontroller development board. We describe the construction, operating principle, use and performance of the optical detector, which may be...
Contexts in source publication
Context 1
... PCB is designed with wide traces to allow easy fabrication from double-sided copper PCB blanks using a milling machine; alternatively PCB fabrication may be outsourced to a PCB service provider using the provided Gerber files. The locations, orientations and values of the components are shown in Fig. 5. A complete circuit diagram is provided in Fig. S2. All components other than the OPT101 amplified photodiode are soldered directly to the board; the OPT101 is mounted in an 8-pin DIP socket to simplify final assembly. The MCP602 and TC7660 may also be mounted in sockets, but this is not necessary. ~10 cm leads connect the LED to the ...
Context 2
... connect the PCB to a 20 -24 V unipolar power supplying, using the terminal block labelled power in Fig. 5. Then select measurement settings within the firmware and flash the microcontroller. We recommend sticking to the default sample rate of 200 kHz and the default modulation frequency of ~410 Hz, but if necessary these can be changed by modifying the values of Fsig and Fsample in the pre-processor definitions of the file ...
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