The change with the LED occurred with the release of our latest firmware, 7.00. The reason the brightness was lowered was that a new formula is being used to set the brightness of PurpleAir sensors. This new formula allows for higher precision at lower values. Before, an LED could either be too bright or off, and there was no in-between. We have changed the default brightness, and you should now see that change reflected on your indoor sensors.
The LED will also have a new “breathing” effect. This effect will help you know that the sensor is alive and functioning. Before, the sensor could crash, and the LED would not be able to indicate information about that. Now, if the sensor is not blinking, you know that the sensor may be having an issue.
This new firmware is setting up the groundwork for innovations with PurpleAir, and for helping to improve our implementation of the Bosch BME680 sensor.
Users are now able to change the LED settings through the registration form. You can read more about this here: Change the LED Settings on your Sensors.