Camera Selection
Choosing between a digital and film camera will make a huge difference in the type of trail camera you have. A 35mm film camera loaded with infrared film is more durable and may be purchased more cheaply, but you must also factor in the added expense of developing your photographs and having them digitized. The most widely recommended brand of 35mm camera is the Canon Sure Shot Owl PF. Since digital cameras are retired on a yearly basis, it is best to check with your local electronics store for recommendations, based on current digital camera availability. However, if you can find a used Olympus D-370 somewhere, this is an excellent digital camera to use.
Motion Sensor
Selecting a motion detector is a vital part of the process. The motion detector triggers the camera whenever it detects movement within its area of focus. You may choose to purchase a motion detector for an alarm system or security light, or a "complete board" sensor kit, designed specifically for do-it-yourself trail cameras. This should be wired to the camera so that it can trigger the camera's shutter and flash.
Power Source
Battery selection will depend on the camera, motion sensor selection and number of photos taken. Both your camera and sensor draw power from the battery even when idle. The battery must be strong enough to power the motion sensor and camera when the equipment is active even after a long period of inactivity. A weak battery will require frequent replacement. A single 9-volt battery is generally adequate to start with. The photographer can replace this with larger or smaller batteries, depending on frequency of use. Wire both the motion sensor and the camera to the battery.
Housing
The enclosure that your trail camera is placed in is also a consideration. Housings should be watertight to keep out rain, dirt, sand or other elements that can damage your equipment. Some good options include plastic or metal gun or camera storage boxes, ammunition boxes, first-aid kits with rubber seals.
On a side note: To a bear, film smells like food. Putting your camera in a metal housing is the best bet.
Other Parts
Some discretionary parts you may use with your camera include closed cell foam to secure the camera in its housing, an external flash for a more evenly lit photograph, additional wiring to connect the camera to the motion sensor and battery, toggles to turn the camera or motion sensor off, a connector specific to your camera, a desiccant such as silica gel to keep the electronics dry and some form of camouflage, such as camouflage netting or duck blind paint, to disguise your camera.
Tags: your camera, camera motion sensor, motion detector, motion sensor, camera motion, digital camera