Unhandled permission error leads to [Error: Pin has not been exported]

I’m trying to setup/read using this library but i’m getting “Pin has not been exported” error, here is my code:

gpio.setup 23, gpio.DIR_IN, gpio.EDGE_BOTH, ( error, data ) ->

  gpio.read 23, ( error, data ) ->

    if error then return console.log 'error reading', error

    console.log data

here is the error:

error reading [Error: Pin has not been exported]

if i manually export and try to read via gpio it works //=

echo 23 > /sys/class/gpio/export
gpio read 23
0
gpio read 23
1

rPi 2, model B

[JamesBarwell]

Thanks for the report and for the solution.

I think there are two issues here:

1. the README examples are not very good as they don’t catch the errors on pin setup, and people are following their bad example.
2. the API is perhaps a bit too granular for how people want to use the module. Setting up and writing to a pin must be the most common use-case, yet it requires two method calls and error handling at each level. Perhaps there should be a simpler API that combines the step and provides a single place where error-handling is required.

[PiyushRamuka]

@JamesBarwell - created one. Thanks! Issue 59