Sense Nano actions with button 

The small button on the back of the Sense Nano device can be pressed using a Nano removal tool or SIM card tool. The button is used for the following purposes.    

• Check status
• Reboot*
• Deprovision* (remove from site digital twin)

If the LED light does not turn on at all when the button is pressed, the Sense Nano battery is probably fully discharged. Charge using bright light before trying again.

*Important: Contact PassiveLogic before rebooting or deprovisioning, as those actions will remove the Sense Nano device from your site digital twin.

Check status of a Sense Nano

A single, quick press of the button will cause LED blinks that answer the question, "What is your status?"

One blink means provisioned, two blinks means not provisioned. Provisioned means the Sense Nano is part of a site digital twin.

If there are more blinks after a pause, there are errors. See LED signals and error codes.

Reboot a Sense Nano

Contact PassiveLogic before rebooting, as it will remove the Sense Nano device from your site digital twin. Rebooting usually should not be necessary.

1. Press and hold the button. The LED will start to glow.
2. When it reaches full brightness and turns off, let go of the button.

The device reboots and does not blink afterward.

Deprovision a Sense Nano

Deprovisioning removes a Sense Nano device from the site digital twin, allowing it to be used for a different project. Contact PassiveLogic before deprovisioning, as this will remove the Sense Nano device from your site digital twin. Provisioning again 

1. Hold the button down, and the LED will start to glow.
2. When it reaches full brightness and turns off, keep holding the button down for 10 seconds, until the LED blinks.
3. Let go when the LED blinks again.

If the device blinks once, it is now removed from the site digital twin and is ready to be provisioned again with the Lens™ app. 

If it continues to blink multiple times, it means there are errors. See LED signals and error codes.

LED signals and error codes

Response to Lens iOS app flashes

The Lens iOS app uses flashing signals to "wake up" the Sense Nano and begin a Bluetooth connection.

• Acknowledge (three blinks)
  After receiving a flashing signal from the Lens iOS app, the Sense Nano device indicates that it is "waking up" and sending a Bluetooth signal that allows the iPhone to connect and view data.
• No response (no lights) 
  If the Sense Nano device displays no LED lights, it did not understand the flashing signal from the Lens iOS app. Position the flashlight of the iPhone close to the logo on the Sense Nano and try again.

LED signals after single button press

Three types of signals may follow when you click the button on the back of the Sense Nano device. First, it will display the status of whether it's part of a digital twin already. Then warnings or errors will follow if there are any, each with a 1-second delay.

Status

• Not provisioned (one blink)
  This Sense Nano device is not part of a digital twin for any site at this time. 
• Provisioned (two blinks)
  This Sense Nano device is already part of a digital twin for a site.

Battery

A 1-second delay separates the status from the battery warning, if present.

• Battery discharged (no light)
  If no light is displayed at all, the battery is probably fully discharged.
• Low battery (two long, slow blinks)
  This warning will appear if the battery is less than 20% charged.

Errors

A 1-second delay separates the status or battery warning from errors, if present.

• Critical error, codes to follow (SOS pattern)
• Solar Panel Error (one blink)
• TPH+Gas Sensor Error (two blinks)  
• Radiant Sensor Error (three blinks)  

LED signals of wired Sense Nano

A Sense Nano device may optionally be wired for power or 1-wire communication. The following apply to a wired Sense Nano.

• Battery charging (slow blink)
  The slow blink means the Sense Nano battery is below 90% and is being charging from the power wire. A wired Sense Nano will still collect and transmit data while blinking. The Nanos have a sophisticated low-voltage circuit. They do not run on line voltage directly, but operate from the battery. Power wires for wired Nanos are used to charge the battery. 
• Battery charged (no light)
  The battery is at or above 90%.