Difference between revisions of "Wireless remote switch, button press: 1 second=ON, 3 seconds=OFF"
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I bought a 315Mhz transmitter/receiver pair of postage stamp size boards from robotshop.com. Ebay has them too. | 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: | + | 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 transmission, electrical lightning noise, nor from button-bounce: | ||
[[File: 315Mhz_schematic.png]] | [[File: 315Mhz_schematic.png]] | ||
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[[File: LTspice_60Hz_for_1second_goes_through_to_Q2_as_0.7vdc.png]] | [[File: LTspice_60Hz_for_1second_goes_through_to_Q2_as_0.7vdc.png]] | ||
− | 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 previous LTspice. | + | 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: | 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]] |
Revision as of 11:48, 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 transmission, 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: