Eowave Eobody1 - Manual (Page 24)

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Appendix 3 / Making your own sensors • user’s manual
manual ©eowave/Ircam 2003
3 - Making my own sensors
eo•body supports many kind of sensors. Most common sensors are switches and poten-
tiometers, but there are many other kinds of sensors.
Making my own sensor switch
Sensors need a minimum of two cables: ground and signal. When 5 V is connected to the
signal - when using switches for example - it may create an antenna effect generating unde-
sirabled distorsion. This is the reason why the signal must be connected to the ground.
Making my own sensor potentiometer
To use a standard potentiometer with eo•body, connect both outputs of the potentiometer
resistor to the ground and 5 V. Connect the variable output of the potentiometer to the signal
input.
Making my own sensor with other kinds of sensors
Some sensors like distance sensors need an extra power supply. eo•body delivers +5V and
+9V to power these sensors up to 250 mA. When the total consumption from all the sensors
plugged to
eo•body is higher than 250 mA, an additional external power supply is necessary.
(to avoid antenna effect
when the switch is off)
3-5 Kohm
ground
+ 5V Signal
Switch
+ 5V ground
Signal
Sensor
Potentiometer
+ 5V or + 9V
Signal ground
ground
Coming from eo•body or external
power supply (any other voltage has to
come from an external power supply)