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service-mma8451

1.0.4 • Public • Published

NXP MMA8451 3-axis Accelerometer Service plug-in for express-modular-server

This is a plug-in for express-modular-server. It provides a service which samples the NXP MMA8451 3-axis accelerator through the Linux event device for the specified amount of time.

If a string option is presented upon initialization, it is the base endpoint to serve accelerometer samples from. If this option is not present, a base endpoint of /accelerometer/ is used.

Install

npm install service-mma8451

The device you are running on must have kernel support for the mma8451. This code has been tested on a Technologic Systems TS-7680 with accelerometer option, compiling and installing support for boards shipped without it can be found here.

Usage

The following example loads the mma8451 module with the default endpoint:

var server = require("express-modular-server")({
     http:true
   })
    // other API calls here
    .API("mma8451")
    .start()

In this example, an endpoint of /acc is used to serve accelerometer samples:

var server = require("express-modular-server")({
     http:true
   })
    // other API calls here
    .API("mma8451","/acc/")
    .start()

To acquire accelerometer samples from the endpoint, pass the number of milliseconds after the trailing slash. The data is returned a text/plain which each line containing comma separated values of time (as number of milliseconds sinch the Epoch), x, y, and z-axis values as reported by the chip according to the current scale.

Example (sample accelerometer for 1 second):

wget http://192.168.1.100/accelerometer/1000

To Do

Allow for an object to be passed to options. Allow for a key in the object to specify the scale to use and the polling period.

Don't hardcode the event device file.

Copyright

Written by Michael Schmidt.

License

GPL 3.0

Keywords

none

install

npm i service-mma8451

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0

version

1.0.4

license

GPL 3.0

homepage

github.com

repository

Gitgithub

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