Running without root permission

[PiyushRamuka]

I am using v0.8.1 and i get following error when I try to run this application without root permission. It works perfectly with root.

Error: Pin has not been exported for write at /var/www/smartlyteplus/node_modules/rpi-gpio/rpi-gpio.js:243:20 at _combinedTickCallback (internal/process/next_tick.js:73:7) at process._tickCallback (internal/process/next_tick.js:104:9)

Here is my code

var gpioDriver = require('rpi-gpio');

function setPin(pin, state, cb){
    gpioDriver.setup(pin, gpioDriver.DIR_OUT, function(){
        gpioDriver.write(pin, state, function(err){
            if(err){
                return cb(err);
            }
            return cb();
        });
    });
}

[thecodershome]

Looks like user permissions. I created a standard user without access to sudo. I recieved the same message

Error: Pin has not been exported for write at /home/tester/testpi/node_modules/rpi-gpio/rpi-gpio.js:243:20 at _combinedTickCallback (internal/process/next_tick.js:67:7) at process._tickCallback (internal/process/next_tick.js:98:9)

I also opened node in command line and ran these commands

var gpio = require('rpi-gpio')

 gpio.setup(7,function(err,res){console.log(err)})

{ Error: EACCES: permission denied, open '/sys/class/gpio/export' at Error (native)
  errno: -13,
  code: 'EACCES',
  syscall: 'open',
  path: '/sys/class/gpio/export' 
}

So I figured out that a user needs to be in the gpio group. To see the current user groups run groups into the terminal. If they don't have gpio then run this to add them sudo adduser USERNAME gpio where USERNAME is the name of the user. After that everything worked just as it should.

[paulostergaard]

Adding homebridge user to the gpio group worked (finally!) for me as well. Good tip.

[JamesBarwell]

Thanks all for the bug report and for the solution. I'll get this added to the readme.