# Commands

## digitalRead(pin, callback)

Reads a value using digital write to a pin.

##### Params

- **pin** - the value of the pin
- **callback** - params for the pin value

##### Returns

`callback integer` 

## digitalWrite(pin, value)

Writes a value using digital write to a pin.

##### Params

- **pin** - the value of the pin
- **value** - paramas for the pin value 

##### Returns

`null`

## analogRead(pin, callback)

Reads a value using analog write to a pin.

##### Params

- **pin** - pin data 
- **callback** - callback data

##### Returns

`callback integer` 

## analogWrite(pin, value)

Writes a value using analog write to a pin.

##### Params

- **pin** - the value of the pin
- **value** - paramas for the pin value 

##### Returns

`null`

## pwmWrite()

Writes the pwm value.(analogWrite)

##### Returns

`null`

## servoWrite()

Writes the servo value.(analogWrite)

##### Returns

`null`

## command(commandName, args, callback)

Calls a function on the Spark Core via the API.

##### Params

- **commandName** - string name of the function to call on the Spark
- **args** - array of arguments to pass to the function call
- **callback** - optional, callback to be triggered with the response_value from
  Spark's API

##### Returns

`null`

## variable(variableName, callback)

Requests the value of a variable from the Spark Core via the API

##### Params

- **variableName** - name of the variable to request from the Spark Core
- **callback** - callback to be triggered with the value from the Spark Core

##### Returns

`null`

## listenForEvents(events)

Listens to Server-Sent Events coming from the Spark Core, and emits the same
events.

##### Params

- **events** - array of events to add listeners for

##### Returns

`null`