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NOTE: This sensor and menu are designed to work with projectiles with a (nearly) constant velocity

such as bullets or pellets. The sensor and menu can be used for objects falling through the sensors

but due to the effects of gravity, the distance value will not be accurate and the user will need to start

the drop from the same position each time to get consistent results.

NOTE: This menu uses the readSensorDigitalFast method to read the sensor values and depends on

the internal processor thresholds to determine if the sensor is high or low.

For more information on using the projectile sensor with the Camera Axe see this article:

http://diyphotography.net/bullet-photography-at-home

Valve Sensor

The valve sensor allows taking pictures of droplets of liquid. When used with the valve menu

described above, the valve sensor allows taking pictures of up to two droplets at a time including

droplet collisions.

When connecting the valve sensor you want to plug it into the Sensor1 port on the Camera Axe. To

trigger your camera there are two options. The first is to trigger it manually with a fairly long exposure

like 5 seconds just before you activate the valve sensor. The second option (and I think this is a little

easier) is to connect your camera to the Camera Axe's Camera/Flash 1 port and put your camera's

exposure to bulb so the Camera Axe can trigger your camera. You will need to connect one or more

flashes to the Camera/Flash 2 port. The valve menu will trigger the camera attached to Camera/Flash

1 port 100ms before triggering the first droplet and will turn off the camera 200 ms after the flash is

fired when attached to Camera/Flash 2 port. The rest of the timing is determined by the parameters in

the valve menu.

For more detail on using the Camera Axe with the valve sensor and this example, see the tutorial at

http://www.cameraaxe.com/wiki/index.php?title=ValveSensor.

Photogate Sensor

This photogate sensor, which plugs into either of the Sensor ports on the Camera Axe, detects when

something passes through the gate. Great for detecting well aimed bullets, water droplets, or anything

that can pass through the 0.4 inch gap. This functions very similar to the light sensor and the laser,

but this plugs into a single sensor port and is easier to setup for small objects.