RF energy harvesting dev kit uses PIC MCUs

RF energy harvesting dev kit uses PIC MCUs


Colin Holland
10/27/2010 3:41 AM EDT


Jagdish Bisawa

10/29/2010 9:49 AM EDT

This is a good development.

The requirement for low-powered wireless sensors has …

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The Lifetime Power Energy Harvesting Development Kit for Wireless Sensors

combines Microchip’s PIC microcontrollers and RF-based wireless power products from Powercast Corp.
The kit is intended to demonstrate and develop smart-energy, wireless-sensor applications that are reliably and perpetually powered by radio waves—eliminating the need for a battery. The included transmitter can wirelessly power sensor devices from more than 40 feet away.
The kit has a 3-watt Powercaster transmitter as the power source, two P2110 Powerharvester receiver evaluation boards, two custom-designed wireless sensor boards, the XLP 16-bit Development Board pre-loaded with jointly developed application software, an IEEE 802.15.4 transceiver and other accessories
The main challenges for the designers of wireless sensor applications fall into the categories of power, location and wireless communication. The combination of Powercast’s RF transmitter and receiver energy-harvesting system, which broadcasts and converts RF energy into DC power, with Microchip’s XLP PIC microcontrollers is designed to solve all three of these design challenges.
Powercast’s RF energy harvesting system provides predictable and reliable power, using broadcasted RF energy for wire- and battery-free operation, or to wirelessly charge battery-based systems. In the Lifetime Power kit, the Powercaster transmitter broadcasts RF energy to the Powerharvester receiver, which can be embedded into an OEM’s micro-power device.
The receiver then converts the RF energy and presents it as a regulated power supply to Microchip’s PIC24F microcontroller. The recently announced Powercast transmitter included in the kit is approved by the FCC (Part 15) and Industry Canada.
Using broadcasted RF energy as the application’s sole power source allows for untethered and battery-free operation in hazardous or inaccessible locations, which would otherwise require labor-intensive or potentially dangerous battery maintenance. Additionally, broadcasted RF energy is controllable (can be scheduled, continuous or on-demand) and works in locations where other potentially intermittent energy-harvesting sources (e.g., solar, vibration and heat) make them unreliable.
Microchip’s configurable MiWi and MiWi P2P stacks save power by enabling only the most essential wireless communication features. In addition to these proprietary Microchip protocols, the kit’s included MRF24J40 IEEE 802.15.4 transceiver also supports Microchip’s ZigBee stacks. From a functional standpoint, Microchip’s RF transceiver allows for continual readings of sensor data, portability and much easier installation than wired communication provides.
In addition to solving these three major challenges, the Lifetime Power kit provides modular development with Microchip’s included XLP 16-bit development board. This flexible platform allows customization for developing applications, and enables faster evaluation, prototyping and time to market.
The battery-free wireless sensor nodes include sensors for temperature, humidity and light, along with an external input. The software for the wireless sensor nodes and the access point is pre-loaded for simple, out-of-the-box operation.
The Microchip nanoWatt XLP PIC MCUs have sleep currents down to 9 nA, active mode currents down to 45 uA/MHz, code execution efficiency and multiple wake-up sources. With the end devices powered only by radio waves (RF energy), the development kit enables rapid prototyping of low power applications such as RF sensors, temperature / environmental sensors, building automation and security sensors.

The XLP 16-bit development board with the MRF24J40MA PICtail Daughter Board (2.4 GHz, 802.15.4) is utilized as an access point to collect data from the wirelessly-powered sensor nodes.

This data is reported to a PC user interface via a USB connection.

This allows for experimentation and balancing of energy collection vs. energy use, maximizing the benefits of the harvested energy. With the included power receiving antennas, typical operation of the battery-free wireless sensor nodes is possible from 40-50 feet.
The Lifetime Power Energy Harvesting Development Kit

for Wireless Sensors is available today for $1250

from Powercast’s distributors, includingmicrochipDIRECT.




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