Logtta_CO2

CO2 concentration sensor by UNI-ELECTRONICS

Official product introduction page is here

Available modes

• Beacon mode
• Connectable mode

Beacon data (getData())

• battery: Battery level (%) or USB power supply (254)
• co2: CO2 concentration (ppm)
• interval: Transmission interval (sec)

Connected data (getDataWait())

• co2: CO2 concentration (ppm)

Use case (Beacon mode)

// Javascript
const Logtta_CO2 = Obniz.getPartsClass('Logtta_CO2');
await obniz.ble.initWait();
obniz.ble.scan.onfind = async (peripheral) => {
  // Get operation mode, it becomes null when not Logtta_CO2
  const mode = Logtta_CO2.getDeviceMode(peripheral);
  if (mode === 'Beacon') {
    // Generate an instance
    const device = new Logtta_CO2(peripheral, mode);
    // Get data and output to the console
    console.log(device.getData());
  }
};
await obniz.ble.scan.startWait(null, { duplicate: true, duration: null });

Use case (Connectable mode)

Connect then get data & battery remaining once

Use batteryService.getBatteryLevelWait() to get battery levels.

When the value is 254, the USB power supply is driven, otherwise the remaining amount is returned in percentages.

// Javascript
const Logtta_CO2 = Obniz.getPartsClass('Logtta_CO2');
await obniz.ble.initWait();
obniz.ble.scan.onfind = async (peripheral) => {
  // Get operation mode, it becomes null when not Logtta_CO2
  const mode = Logtta_CO2.getDeviceMode(peripheral);
  if (mode === 'Connectable') {
    // Generate an instance
    const device = new Logtta_CO2(peripheral, mode);
    console.log(`Connecting to Logtta_CO2[${device.address}]`);

    // Connect to the device
    await device.connectWait();
    console.log(`Connected to Logtta_CO2[${device.address}]`);

    // Get data from the device
    const data = await device.getDataWait();
    console.log(`Logtta_CO2[${device.address}]: ${data.co2}ppm`);

    if (device.batteryService) {
      // Get battery level from the device
      const batteryLevel = await device.batteryService.getBatteryLevelWait();
      // Output 'USB power supply' at 254
      if (batteryLevel === 254)
        console.log(`Logtta_CO2[${device.address}]: USB power supply`);
      // Output battery remaining amount when other than 254
      else
        console.log(`Logtta_CO2[${device.address}]: BatteryLevel ${batteryLevel}%`);
    }

    // Disconnect from the device
    await device.disconnectWait();
    console.log(`Disconnected from Logtta_CO2[${device.address}]`);
  }
};
await obniz.ble.scan.startWait();

Connect then regularly get data

Use startNotifyWait() to wait for data from the device always.

// Javascript
const Logtta_CO2 = Obniz.getPartsClass('Logtta_CO2');
await obniz.ble.initWait();
obniz.ble.scan.onfind = async (peripheral) => {
  // Get operation mode, it becomes null when not Logtta_CO2
  const mode = Logtta_CO2.getDeviceMode(peripheral);
  if (mode === 'Connectable') {
    // Generate an instance
    const device = new Logtta_CO2(peripheral, mode);
    console.log(`Connecting to Logtta_CO2[${device.address}]`);

    // Connect to the device
    await device.connectWait();
    console.log(`Connected to Logtta_CO2[${device.address}]`);

    // Start waiting for data from the device
    device.startNotifyWait((data) => {
      console.log(`Logtta_CO2[${device.address}]: ${data.co2}ppm`);
    });
  }
};
await obniz.ble.scan.startWait();

Connect then activate beacon mode

Use setBeaconModeWait() to control the valid invalidity of the mode that periodically disseminates beacons.

Disconnecting after setting it is effective.

Before need use authPinCodeWait() to authenticate with the device. (Default authentication code: 0000)

To disable beacon mode, it is necessary to press and hold the button on the device for more than 2 seconds.

// Javascript
const Logtta_CO2 = Obniz.getPartsClass('Logtta_CO2');
await obniz.ble.initWait();
obniz.ble.scan.onfind = async (peripheral) => {
  // Get operation mode, it becomes null when not Logtta_CO2
  const mode = Logtta_CO2.getDeviceMode(peripheral);
  if (mode === 'Connectable') {
    // Generate an instance
    const device = new Logtta_CO2(peripheral, mode);
    console.log(`Connecting to Logtta_CO2[${device.address}]`);

    // Connect to the device
    await device.connectWait();
    console.log(`Connected to Logtta_CO2[${device.address}]`);

    // Send authentication code
    await device.authPinCodeWait(0000);
    console.log(`Logtta_CO2[${device.address}]: Sent auth pin code`);

    // Enable beacon mode
    await device.setBeaconModeWait(true);
    console.log(`Logtta_CO2[${device.address}]: Enabled beacon mode`);

    // Disconnect from the device
    await device.disconnectWait();
    console.log(`Disconnected from Logtta_CO2[${device.address}]`);
  }
};
await obniz.ble.scan.startWait();