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miniDaqu — Manual 3.6 Potentiometers
Sensors may have two or three wires. +5/+12 V input is connected to ap-
pro5/+12 V pin. Signal is connected to one of the F channels, see
Figure 7. The third wire is connected to the GND. Some sensors do not
require GND connection as they are grounded via engine block.
A
4 - 20 mA
C
1
2
1
-
+ BAT
V
GND 3
+5 V 4
AUX 5
6
F
1
F
2
FUEL
P
E
2
7 FL
2
GND 8
E
1
9 FL
1
Y
1
10 ROTOR
GND
+12 V 11
12
Figure 7: An example of active sensor with current output. Symbol A stands
for
Ampere which is synonym for electrical current. For some sensors
connection with GND is not required.
3.6 Potentiometers
Some resistive sensors are in fact potentiometers (fuel level, trim, etc.). They
can be connected as variable resistors or as variable voltage dividers.
3.6.1 Variable Resistor
Section 3.3 applies, when they are connected as variable resistors. Figure 8
shows and example of variable resistor connection. One of F channels is used
in this case, but E could be used as well.
3.6.2 Variable Voltage Divider
The same potentiometer can be also connected as a voltage divider. A voltage
is applied across the potentiometer and the varying part is connected to one
of E or F channels. Supplying voltage must not exceed 5V. In this case, the
output voltage will remain within 0-5 V interval. Figure 9 illustrates possible
connection.
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