Light Switch PCB
The challenge on this board was the high voltage - with 120VAC and 170VDC on the board, traces and components had to be kept far enough apart so no arcing between traces or pins would occur. Board cutout channels were also used to isolate high voltage circuitry from low voltage circuitry. (Note the parts on this board could theoretically accept 240VAC input but I did not check to see if the space between traces would safely allow that voltage - I tend to doubt it).
The board has duplicate runs on top and bottom from the 120 VAC terminal block pins to the relay pins. The PCB was fabricated using 3 oz copper so the combined top/bottom 120VAC runs can support 15 Amps. Other runs were able to be narrower due to the extra thickness of the 3 oz traces, making it easier to keep trace distances further apart and meet "creepage" rules. Note the Particle Photon must be soldered onto the board - there is not enough height for female header sockets to be used. The pictures below are obviously missing the Particle Photon - it goes on the top side. The color PCB layout below does not match the prototype boards - they used a 4 pin header, while the layout shown and the Gerbers below use a 10 pin header that allows I2C and SPI connections to be made for some other yet to be thought of project.
The Cap Touch PCB is just one sheet of copper on one side, and the Cap Touch IC, header and 4 caps and resistor. The capacitive plate side of the PCB is connected to the Cap Touch IC via a .... via. It works with the 4 pin header or the 10 pin header board.
Gerber files for each board are available at the bottom of the page. Native National Instruments Ultiboard files are also provided for the few who may have Ultiboard - I know Multisim and Ultiboard but do not know Eagle so cannot include a .brd file. National Instruments offers a 30 day free trial if you want to give it a try.
The challenge on this board was the high voltage - with 120VAC and 170VDC on the board, traces and components had to be kept far enough apart so no arcing between traces or pins would occur. Board cutout channels were also used to isolate high voltage circuitry from low voltage circuitry. (Note the parts on this board could theoretically accept 240VAC input but I did not check to see if the space between traces would safely allow that voltage - I tend to doubt it).
The board has duplicate runs on top and bottom from the 120 VAC terminal block pins to the relay pins. The PCB was fabricated using 3 oz copper so the combined top/bottom 120VAC runs can support 15 Amps. Other runs were able to be narrower due to the extra thickness of the 3 oz traces, making it easier to keep trace distances further apart and meet "creepage" rules. Note the Particle Photon must be soldered onto the board - there is not enough height for female header sockets to be used. The pictures below are obviously missing the Particle Photon - it goes on the top side. The color PCB layout below does not match the prototype boards - they used a 4 pin header, while the layout shown and the Gerbers below use a 10 pin header that allows I2C and SPI connections to be made for some other yet to be thought of project.
The Cap Touch PCB is just one sheet of copper on one side, and the Cap Touch IC, header and 4 caps and resistor. The capacitive plate side of the PCB is connected to the Cap Touch IC via a .... via. It works with the 4 pin header or the 10 pin header board.
Gerber files for each board are available at the bottom of the page. Native National Instruments Ultiboard files are also provided for the few who may have Ultiboard - I know Multisim and Ultiboard but do not know Eagle so cannot include a .brd file. National Instruments offers a 30 day free trial if you want to give it a try.
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