Trigger Sensor
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 Flash Holder Light Adjust Mount + Remote Trigger Sensor $12.95 Time Remaining: 4d 23h 14m Buy It Now for only: $12.95 |
 SYK 3 Hot Shoe Flash Remote Trigger Sensor Fr Canon JVC $5.66 Time Remaining: 20d 17h 49m Buy It Now for only: $5.66 |
 Wireless Remote Slave Sensor Trigger for Hot Shoe Flash $10.99 Time Remaining: 7d 18h 58m Buy It Now for only: $10.99 |
 Wireless Remote Slave Sensor Trigger for Hot Shoe Flash $10.98 Time Remaining: 9d 17h 24m Buy It Now for only: $10.98 |
 Flash Light Stand Tripod Mount Hot Shoe Trigger Sensor $7.99 Time Remaining: 5d 13h 12m Buy It Now for only: $7.99 |
 Flash Holder Light Adjust Mount Remote Trigger Sensor $7.99 Time Remaining: 5d 13h 12m Buy It Now for only: $7.99 |
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Nikon ML-L3 Wireless Remote Control List Price: $20.50 Sale Price: $14.95 Used From: $7.40  |
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Wireless remote control for Nikon's D70 Digital SLR camera, will trip the shutter remotely from a distance of up to 16ft. Also compatible with N65, Pronea S, Nuvis S & Lite Touch Zoom Cameras. |
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RC-1 REMOTE Wireless Shutter Release for Canon EOS, Rebel List Price: $14.99 Sale Price: $0.01 |
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Taking pictures remotely is even easier with a wireless shutter release, with a range of approximately 16 feet (4.8 meters). Mount your camera and choose "delayed remote" or "quick response remote" from your camera's control panel display... |
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Sekonic L-358 Flash Master Light Meter List Price: $554.00 Sale Price: $308.50 Used From: $259.00 |
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Since its introduction, Sekonic's L-358 Flash Master has become the best-selling digital flash meter in its class. Weather-sealed against the nastiest of working conditions, the L-358 delivers dead-nuts accurate flash and ambient light reading in both incident and reflected modes... |
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Moultrie Game Spy M-100 List Price: $199.99 Sale Price: $130.95 |
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The Game Spy M-100 mini-camera is loaded with features like widescreen pictures and videos, a new Illumi-Night sensor, a battery life calculator and Plot Stalker time-lapse mode. All of this comes in a unit smaller than your hand... |
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Sony Alpha RMT-DSLR1 Camera Remote (Black) List Price: $29.99 Sale Price: $31.95 Used From: $25.95 |
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Wireless Remote Control - For shooting as well as viewing convenience, the multi-function wireless remote control allows you to control HDTV photo viewing and trip the shutter by remote to put yourself in the picture. |
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Canon RC-1 Wireless Remote Control for Select DSLR Cameras List Price: $30.00 Sale Price: $21.99 Used From: $12.95 |
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The Canon RC-1 remote control makes taking group photos easy by allowing you to take pictures away from the camera. The RC-1 allows the selection of either a 2-second shutter delay or instant shutter release... |
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Cowboystudio SYK-3 Optical Slave Trigger List Price: $8.00 Sale Price: $8.00 |
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# This Hot Shoe Flash Remote Slave Trigger has a sensor to sense light from the main flash so as to trigger the slave flash wireless. # This slave sensor triggers the flash attached to it when it senses the light from the main flash... |
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Bushnell 8MP Trophy Cam Bone Collector Trail Camera List Price: $336.95 Sale Price: Too low to display |
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Compact and efficient, the 3.5 by 5.5-inch 8-Megapixel Trophy Cam 119446C Trail Camera from Bushnell is your 24-hour eyes in the woods. Thanks to a 32-LED flash that is invisible to game and other hunters, the 119446C Trail Camera can capture images in total darkness with a range of 45 feet... |
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Motion-Activated Mini Spy Camera with Night Vision and 10-Day Battery Life and 1-Year Warranty by SpygearGadgets Sale Price: $100.00 Used From: $111.64 |
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The Motion Activated Mini Night Vision Spy Camera with Night Vision by SpygearGadgets is a small but powerful spy camera! Measuring just two inches tall, this camera records high-quality 640x480 color video and the battery lasts up to 10 days on a single charge! (Up to 4 hours of continuous recording) The motion activated recording detects body heat, which results in the most accurate motion detection! Operation is simple, there is only one button to turn the camera on! Simply slide the button into the "ON" position, and whenever motion/body heat is detected, the camera records to the hidden micro SD card (not included)... |
How to use a capacitive sensor to trigger a relay?
I know how to use an Op Amp to sense a differential input and trigger a relay. This works great for resistive and voltage based sensors.
I imagine that I need to do something with AC, but im not certain. Perhaps use the capacitor to phase shift then rectify it for a variable voltage output?? Do you think 60hz AC would work or do I need to generate a higher frequency?
What are your thoughts? Thanks for your help!
capacitive sensors use oscillators and frequency much higher than 60Hz. instead of developing one, you can also buy them. typical sensing range for capacitive proximity sensor in 18mm barrel is about 10-15mm. like most industrial sensors, usually it operates on DC (nominal is 24V but they all work in wider range, usually 12-28V) and can drive relay directly. check Turck, PhoenixContact, Omron etc.
there are AC versions too (as well as DC with NPN output) but PNP is most popular in western world (NPN is popular in Japan).
here is example:
http://www.turck-usa.com/products/sensors/capacitive/Barrel_with_Quick_Disconnect/
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