Hardware Reference
In-Depth Information
var
enable
=
'P9_21'
;
// Pin to use for PWM speed control
in1
=
'P9_15'
,
in2
=
'P9_16'
,
step
=
0.05
,
// Change in speed
min
=
0.05
,
// Min duty cycle
max
=
1.0
,
// Max duty cycle
ms
=
100
,
// Update time, in ms
speed
=
min
;
// Current speed;
b
.
pinMode
(
enable
,
b
.
ANALOG_OUTPUT
,
6
,
0
,
0
,
doInterval
);
b
.
pinMode
(
in1
,
b
.
OUTPUT
);
b
.
pinMode
(
in2
,
b
.
OUTPUT
);
function
doInterval
(
x
) {
if
(
x
.
err
) {
console
.
log
(
'x.err = '
+
x
.
err
);
return
;
}
timer
=
setInterval
(
sweep
,
ms
);
}
clockwise
();
// Start by going clockwise
function
sweep
() {
speed
+=
step
;
if
(
speed
>
max
||
speed
<
min
) {
step
*= -
1
;
step
>
0
?
clockwise
() :
counterClockwise
();
}
b
.
analogWrite
(
enable
,
speed
);
console
.
log
(
'speed = '
+
speed
);
}
function
clockwise
() {
b
.
digitalWrite
(
in1
,
b
.
HIGH
);
b
.
digitalWrite
(
in2
,
b
.
LOW
);
}
function
counterClockwise
() {
b
.
digitalWrite
(
in1
,
b
.
LOW
);
b
.
digitalWrite
(
in2
,
b
.
HIGH
);
}
process
.
on
(
'SIGINT'
,
function
() {
console
.
log
(
'Got SIGINT, turning motor off'
);
clearInterval
(
timer
);
// Stop the timer
