tca9548a

    1.0.0 • Public • Published

    tca9548a

    A Node.js module for the TCA9548A I2C 8-channel Multiplexer.

    Built using node v11.9.0

    This is Node.js I2C module for the TCA9548A Low-Voltage 8-Channel I2C Switch/Multiplexer.

    This module uses i2c-bus which should provide access with Node.js on Linux boards like the Raspberry Pi Zero, 1, 2, or 3B and +, BeagleBone, BeagleBone Black, or Intel Edison.

    Since TCA9548A needs to talk directly to the I2C bus and requires access to /dev/i2c, you will typically need run Node with elevated privileges or add your user account to the i2c group: $ sudo adduser $USER i2c. On Raspberry PI, be sure to enable I2C protocol in system configuration before proceeding.


    Example Code:

    //require module
    //
    const TCA9548A = require('tca9548a');
     
    //module is constructed via Class so first call a new instance
    //device is automatically initialized and ready to use
    //addr defaults to 0x70 and bus defaults to 1
    //
    const tca9548a_1 = new TCA9548A({addr: 0x70, bus: 1});
     
    //if you have more than one TCA9548A, can call another instance
    //make sure that the addr is correct!!!
    //
    const tca9548a_2 = new TCA9548A({addr: 0x71, bus: 1});
     
     
    //as an example, if using two bme280 temp sensors (sensor1 and sensor2)
    //that have the same address need to enable the specific 
    //multiplexer port each time you want to read from a certain device
    //singlePortOn activates the port of the argument and 
    //disables all other ports
    //argument has to be a number 0-7
    //
    //use a callback to ensure that the port is enabled 
    //before proceeding with other processing
    //
    //for example, sensor1 is attached to port 2 on the multiplexer
    //
    tca9548a_1.singlePortOn(2, doSomethingWithSensor());
     
    //then read from sensor2 attached to port 6 on the multiplexer
    //
    tca9548a_1.singlePortOn(6, doSomethingWithSensor());
     
     
    function doSomethingWithSensor () {
      //process sensor data magic
      console.log('doSomethingWithSensor called');
    }
     
     
     
    //can also enable all ports
    tca9548a_1.allPortsOn();
     
    //or disable all ports
    tca9548a_1.allPortsOff();
     

    Install

    npm i tca9548a

    DownloadsWeekly Downloads

    5

    Version

    1.0.0

    License

    MIT

    Unpacked Size

    7.2 kB

    Total Files

    3

    Last publish

    Collaborators

    • coreymjacobs