24 lines
No EOL
702 B
JavaScript
24 lines
No EOL
702 B
JavaScript
var DigitalSensor = require('./base/digitalSensor')
|
|
var commands = require('../commands')
|
|
|
|
function UltrasonicDigitalSensor(pin) {
|
|
DigitalSensor.apply(this, Array.prototype.slice.call(arguments))
|
|
}
|
|
UltrasonicDigitalSensor.prototype = new DigitalSensor()
|
|
|
|
UltrasonicDigitalSensor.prototype.read = function() {
|
|
var write = this.board.writeBytes(commands.uRead.concat([this.pin, commands.unused, commands.unused]))
|
|
if (write) {
|
|
this.board.wait(200)
|
|
this.board.readByte()
|
|
var bytes = this.board.readBytes()
|
|
if (bytes instanceof Buffer)
|
|
return (bytes[1] * 256 + bytes[2])
|
|
else
|
|
return false
|
|
} else {
|
|
return false
|
|
}
|
|
}
|
|
|
|
module.exports = UltrasonicDigitalSensor |