IoT.js-API-ADC.md

IoT.js provides ADC module.

Module: adc

Platform Support

The following shows ADC module APIs available for each platform.

	Linux (Ubuntu)	Raspbian (Raspberry Pi)	Nuttx (STM32F4-Discovery)
adc.read	X	X	O
adc.readSync	X	X	O
adc.unexport	X	X	O

pin

• On Nuttx, you have to know pin name. The pin name is defined in target board module. For more module information, please see below list.
• STM32F4-discovery.

Constructor

new adc(pin[, callback])

• pin: Number
• callback: Function(err)
• err: Error

Creates ADC object.

For example,

var adc = require('adc');
var stm32f4Pin = require('pin').STM32F4DIS;

var adc1 = new adc(stm32f4Pin.ADC1_3, function() {
  adc.read(function(err, value) {
    console.log(value);
  });
});

Methods

adc.read([, callback])

• callback: Function(err, vaule)
• err: Error
• value: Number - analog value

Reads the analog value from pin asynchronously.

callback will be called after read the analog value.

adc.readSync()

• Return: Number - analog value

Reads the analog value from pin synchronously.

adc.unexport([callback])

• callback: Function(err)
• err: Error

ADC device is released. This function must be called after the work of ADC finished.

callback will be called after ADC device is released.