analogRead(pin, [callback])

Read the voltage at an analog input pin.

Arguments

• pin: the pin identifier
• callback: called upon completion

Return value

• Number from 0 to 1 where 0 is 0V and 1 is the maximum input voltage (1.8V)

callback(x)

• x.value: return value
• x.err: error status message

Example run restore

var b = require('bonescript');
b.analogRead('P9_36', printStatus);
function printStatus(x) {
    console.log('x.value = ' + x.value);
    console.log('x.err = ' + x.err);
}

Build and execute instructions

• Apply voltage between 0V and 1.8V to P9_36 and run the example code.
• Adjust the voltage between 0V and 1.8V to P9_36 and run the example code again.
• Alter the code to look at inputs on other analog input pins.

See also

Topics

• BeagleBone expansion headers
• Analog I/O

Related functions

• require
• analogWrite

Examples

• Bacon Cape

Last updated by rachelballdesign on Wed Jun 19 2013 21:11:30 GMT-0000 (UTC).

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