Battery Free Wirelessly Powered Sensor EVK

Figure 1: System Diagram

A diagram illustrating the system. The Energous WattUp PowerBridge transmitter sends RF power to Atmosic RF Energy Harvesting End-Devices (sensors). The sensors collect data (Temperature, Humidity, Accelerometer) and send it via Bluetooth to a mobile app.

Box Contents

• 1W WattUp PowerBridge Transmitter (1)
• Battery-Free IoT Sensors (2)
• 5V/1A USB power adapter and USB-A to -C cable

Images show the packaging of the EVK, including the PowerBridge transmitter, two sensors, and the power adapter/cable.

1. Setup the Powerbridge

• Connect the USB cable to the PowerBridge Transmitter and the power supply.
• Mount the PowerBridge on a stand, a wall or a ceiling using keyhole screw mounts in a position pointing toward the sensors.

Diagrams illustrate mounting the PowerBridge transmitter using screw mounts, showing it can be placed on a stand, wall, or ceiling, with an arrow indicating the direction towards the sensors.

Setup the Powerbridge Cont'd.

• Plug in the PowerBridge power supply.
• After power-on, the Blue LED flashes for 30s to indicate that the PowerBridge is running.
• The PowerBridge starts RF power transmission automatically, with the white LED indicating that the PowerBridge is now transmitting.

An image of the Wattup PowerBridge front shows two LEDs labeled "Blue LED" and "White LED".

2. Position the Sensors

• Position the sensors within ~1.5m of the PowerBridge.
• The battery free sensors are now receiving wireless power from the PowerBridge.
• Once the sensors receive sufficient power, they will begin taking sensor measurements (Temperature, Humidity, and 3D Accelerometer data), and sending via BLE advertisements.

3. Reading the Sensor Data

• Download the Atmosic DevTools App from the Android or Apple Store.

The document indicates QR codes are provided for downloading the Atmosic DevTools App from the Google Play Store and the Apple App Store.

4. Using the Atmosic DevTools App

Instructions show opening the Atmosic DevTools App and tapping the "Applications" button, then tapping the "Beacon" button to start scanning.

The sensor beacons appear with the name "Atmosic BCN" followed by a serial number. Tapping the "Monitor" button displays sensor data.

The sensor data displayed includes Received Signal Strength (RSSI), Temperature (°C), Humidity (%), and Accelerometer data (X, Y, Z axes).

5. Typical Sensor Range

• Time to initial sensor data measurement: The sensors store energy on an internal capacitor. Without energy from an RF source, the capacitors will discharge over the course of 8 to 10 minutes.
• Once discharged, it will take approximately 4 to 6 minutes at a distance of 1.5 meters to recharge the capacitor and enable sensor transmissions.
• Sensor Placement: The Sensor can be placed horizontally or vertically.

Two images show an Atmosic Battery-Free Sensor, one placed vertically, and the other placed horizontally.

Typical Sensor Range Cont'd.

The Sensor will receive power in an area approximately +/- 30 degrees from boresight to the PowerBridge Transmitter. There will be some small amount of performance delta depending on the rotation of the Sensor relative to boresight from the PowerBridge Transmitter.

An image shows the PowerBridge transmitter positioned on a table with a ruler and an Atmosic sensor receiver at a distance, illustrating the operational range.

FCC Regulatory Information

FCC ID: 2ADNG-VN25 Model: VN25

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the equipment being interfered with.
• Increase the separation between the charger and the equipment subject to interference.
• Connect the equipment into an outlet on a circuit different from that to which the charger is connected.
• Consult the dealer or an experienced radio/TV/electronics technician for help.

CAUTION: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

VN25 RF wireless charger complies with FCC RF radiation exposure limits for an uncontrolled environment in accordance with FCC Rule Part 2.1093. The Wireless charger transmitter is designed to be installed on the ceiling or on a side wall and must be installed accordingly to ensure a minimum 20cm separation distance from persons.

IC: 23686-VN25, Model: VN25

This device complies with Industry Canada's licence-exempt RSSs. Operation is subject to the following two conditions: (1) This device may not cause interference; and (2) This device must accept any interference, including interference that may cause undesired operation of the device. This device complies with Industry Canada's licence-exempt CNR. Operation is authorized under the following two conditions: (1) the device may not cause interference; (2) the user of the device must accept any radio interference, even if the interference is likely to compromise its operation.

VN25 RF wireless charger complies with ISED radiation exposure limits. The Wireless charger transmitter is designed to be installed on the ceiling or on a side wall and must be installed accordingly to ensure a minimum 22cm separation distance from persons. Le chargeur sans fil RF VN25 est conforme aux limites d'exposition aux rayonnements ISED. L'émetteur du chargeur sans fil est conçu pour être installé au plafond ou sur un mur latéral et doit être installé en conséquence pour assurer une distance de séparation minimale de 22 cm des personnes.

Contact:

sales@energous.com

T: (408) 963-0200