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16
OpenTracker 2.4
User Manual (1.4.0)
Voltage detection VDET (ignition detection)
The voltage detection is designed to give feedback about the ignition status. If the Pin VDET is connected to
the Ignition line of a car the Tracker is able to detect a logical 1 (Ignition off) or a logical 0 (ignition on) on
S_DETECT. This is useful to put the tracker asleep or wake it up. VDET is a Digital input.
Operating conditions
VDET Logic 1 (ignition off)
VDET Logic 0 (ignition on)
MIN
MAX
MIN
MAX
V input
0VDC
0.6VDC
1.5VDC
32VDC
Using Ignition detection (VDET)
The ignition detection is a simple Input to detect if the vehicle is started. By adding code the user can define
what to do when ignition is turned on / off. In this example the Tracker will print a string to the debug port.
1.
#define DEBUG 1 //enable debug msg, sent to serial port
2.
#define debug_port SerialUSB
3.
4.
#ifdef DEBUG
5.
#define debug_print(x) debug_port.print(x)
6.
#else
7.
#define debug_print(x)
8.
#endif
9.
10.
11.
void
setup() {
12.
13.
// Ignition detection
14.
pinMode(PIN_S_DETECT, INPUT);
// Initialize pin as input
15.
16.
}
17.
18.
void
loop() {
19.
20.
// Check If Ignition is on
21.
if
(digitalRead(PIN_S_DETECT) == LOW)
22.
debug_print(F(
"Ignition detected!"
));
23.
}
