Difference between revisions of "Wireless remote switch, button press: 1 second=ON, 3 seconds=OFF"
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See 3 second delayed OFF and instant-ON effect in green. Blue is the button held down for 8 seconds each time: | See 3 second delayed OFF and instant-ON effect in green. Blue is the button held down for 8 seconds each time: | ||
[[File: LTspice_V1_bluePress8seconds_blue_givesON-OFF_7v_outputs.png]] | [[File: LTspice_V1_bluePress8seconds_blue_givesON-OFF_7v_outputs.png]] | ||
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+ | I tried to omit the 3H inductor and I ran into a small problem with the data being vdc. The inductor converts it to AC. I think a large serial capacitor would work instead, but then maybe it cannot be a polarised type. I stopped thinking about it since I have an old small power adapter transformer to use as 3H inductor. |
Revision as of 12:18, 3 October 2016
I bought a 315Mhz transmitter/receiver pair of postage stamp size boards from robotshop.com. Ebay has them too.
Here is the schematic of how I used the data output of the receiver. The objective is to process the data without using a digital serial interface processor and to latch the ON and OFF so they do not spuriously switch back and forth from neighborhood transmissions on the same frequency, from electrical lightning noise, nor from button-bounce:
Here is the board layout, which should be redone in surface mount parts some day. I used drawer junk parts and old VCR parts:
Here is the LTspice simulation of the signal filter of data incoming ON and OFF button presses. This 2Hz to 12000Hz response curve shows 60Hz is near the peak response:
After the diode and 47uf capacitor, the signal is 0.7vdc with some ripple. High frequency data would not get through, and neither will lightning pulses. I have a commercial remote switch that was triggered ON by lightning and that is not acceptable, thus my filter idea using 60Hz pulses.
Here is LTspice of the 1s and 3s hold-for-OFF using pulses from V1 which is imitating the 60Hz converted to 0.7vdc from the previous LTspice. See 3 second delayed OFF and instant-ON effect in green. Blue is the button held down for 8 seconds each time:
I tried to omit the 3H inductor and I ran into a small problem with the data being vdc. The inductor converts it to AC. I think a large serial capacitor would work instead, but then maybe it cannot be a polarised type. I stopped thinking about it since I have an old small power adapter transformer to use as 3H inductor.