alec(at)alecmyers.com
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 Posted: Sat Oct 14, 2017 2:58 pm Post subject: Constructing an automatic RCA video camera feed splitter |
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Bob
Do you know how much extra work it takes to make a PIC meet DO-160?
| Quote: | On Oct 14, 2017, at 6:24 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
At 08:00 AM 10/14/2017, you wrote: | Quote: | | --> AeroElectric-List message posted by: "Eric Page" <edpav8r(at)yahoo.com (edpav8r(at)yahoo.com)> Eliminating the 16-DIP-packaged counter and most of the passives sounds fine to me. It will certainly shrink the PCB. If you can give me a pin-out for the uC you propose using, Iâll amend the schematic. |
See attached | Quote: | | Iâll need to know pin numbers for Vcc, Gnd, two outputs to the mux, how weâll read user input for run/hold and rate, and if an ICSP header is needed. Iâm guessing you propose the same (PIC12F683?) used for the recent prop current limiter... |
Yeah . . . only 'case they're cheap and we got lots of them! Probably wouldn't fuss with ICSP, just put the chip in a socket. This lets a user drop a new chip into a fielded assembly should any future feature be desired/necessary. The sequencing software could be set up to default to either SCAN or STEP at power up. Your choice. If the default is STEP, then Channel A input is the first up. Momentary depression of the switch to STEP would advance to next channel in sequence. Momentary depression to SCAN would initiate steps through the four inputs at a rate commanded by the potentiometer. Setting a rate of say 3 to 10 seconds for zero to 5 volts seems a good starting point. I didn't suggest any DO-160 like protections for inputs to the command pins. If the switch is on the board it's not needed. If off the board, extending the lines in a shielded-twisted pair would offer plenty good prophylactics for our environment. | Quote: | | The AD8184 multiplexer has just one output, so I didnât figure a termination resistor was necessary. The connectors shown actually are RCA jacks, despite the CAD symbol looking like a headphone... |
Aha! Been there . . . fiddled with several canned libraries for about an hour each before I dumped them all and crafted my own. Understand. I propose we make this another open source program like the wig-wag was . . . I'll be pleased to set up a folder to host all the work product.
Bob . . .
<Video Sequencer.pdf>
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