Dreaming Robots Camera Axe 5 Manuel de l'utilisateur - Page 14

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function and is reset if necessary in the detectButtonPress function.

Sensors

There are a wide variety of sensors that can be used with the Camera Axe. Depending on the sensor

type and the menu being used, a wide variety of photographs can be taken using the Camera Axe.

This section describes the collection of sensors sold with the Camera Axe but any sensor type that

conforms to the sensor wiring and electrical requirements will work with the Camera Axe unit.

The 3.5 mm jack for sensors provides power (+5V), ground, and access to an analog pin on the

microcontroller. The tip of the 3.5mm plug is +5V, the base of the 3.5 mm plug is ground, and middle

of the 3.5 mm plug is the sensor. In the 5.0 software the sensor pins float instead of using the internal

pull-up resistors in the Atmel chip. This basically means that if nothing is plugged into a sensor port

the values will not be valid and will change sporadically. If this is a problem, the internal pull-up

resistors can be enabled by un-commenting the following two lines in cameraAxe_helperFuncs.c

//digitalWrite(SENSOR1_PIN, HIGH);

//digitalWrite(SENSOR2_PIN, HIGH);

However, this change is not recommended because the pull-up resistors can affect some of the

sensors readings. It was better to just not be able trust the values if no sensor is connected than have

the pull-up resistors affect the readings. Schematics, part lists and circuit board layouts are available

for each of the sensors described below at http://www.cameraaxe.com/wiki/index.php?title=Sensors.

This information can be useful for building these and other sensors as needed.

Light Sensor

The light sensor is used to trigger devices based on changes in the intensity of the light. An example

of how the light sensor would be used is described below.

As an example of how this sensor might be used with the Advanced Sensor menu described above to

record a series of shots as the sun sets the following menu settings could be used. For this use case,

the camera would be plugged into the Camera/Flash 1 port and the light sensor would be plugged

into the Sensor 1 port. Camera/Flash 2 and Sensor 2 are unused in this example. The values in gray

below are ignored and could be anything without affecting this example.

Parameter

Trigger Sensor

Delay ms

Device 1

Device 2

Sensor1

None

000.0