Hardware Reference
In-Depth Information
Example 3-2. Code for using an external LED (externLED.js)
#!/usr/bin/env node
var
b
=
require
(
'bonescript'
);
var
LED
=
'P9_14'
;
var
state
=
b
.
HIGH
;
// Initial state
b
.
pinMode
(
LED
,
b
.
OUTPUT
);
setInterval
(
flash
,
250
);
// Change state every 250 ms
function
flash
() {
b
.
digitalWrite
(
LED
,
state
);
if
(
state
===
b
.
HIGH
) {
state
=
b
.
LOW
;
}
else
{
state
=
b
.
HIGH
;
}
}
Save your file and run the code as before (
Recipe 3.1
).
