Atlas Scientific Conductivity

Atlas Scientific Conductivity Sensor

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Johnny-Five + Grow.js example

Note: for this to work, the circuit needs to be I2C mode. Instructions for this can be found in the documentation.

// Require the Grow.js build and johnny-five library.
var GrowInstance = require('Grow.js');
var five = require('johnny-five');
var ascii = require('ascii-codes');

// Create a new board object
var board = new five.Board();

// When board emits a 'ready' event run this start function.
board.on('ready', function start() {
    // This must be called prior to any I2C reads or writes.
    this.i2cConfig();

    var EC_reading;

    // Create a new grow instance.
    var grow = new GrowInstance({
        name: 'Conductivity sensor', // The display name for the thing.
        desription: 'Atlas Scientific Conductivity sensor',
        username: 'YOURUSERNAMEHERE', // The username of the account you want this device to be added to.
        properties: {},
        actions: {
            log_ec_data: {
                name: 'Conductivity sensor',
                template: 'sensor',
                type: 'EC', // Currently needed for visualization component... HACK.
                schedule: 'every 1 second',
                function: function () {
                    // Request a reading
                    board.i2cWrite(0x64, [0x52, 0x00]);
                    // Read response.
                    board.i2cRead(0x64, 0x00, 7, function (bytes) {
                        var bytelist = [];
                        if (bytes[0] === 1) {
                            for (i = 0; i < bytes.length; i++) {
                                if (bytes[i] !== 1 && bytes[i] !== 0) {
                                    bytelist.push(ascii.symbolForDecimal(bytes[i]));
                                }
                            }
                            EC_reading = bytelist.join('');
                        }
                    });

                    // // Send value to Grow-IoT
                    grow.sendData({
                      type: 'EC',
                      value: EC_reading
                    });
                }
            }
        }
    });
});