8/8/2019 EH Link Datasheet Rev 1

1/2

EH-Link

2.4 GHz Energy HarvestingWireless Node

Technical Product Overview

Little Sensors. Big Ideas.

IntroductionThe EH-Link wireless node is a self powered sensor, harvesting

energy from ambient energy sources. EH-Link is compatible

with a wide range of generator types, including piezoelectric,electrodynamic generators, and thermoelectric generators.

In applications with vibrating machinery or structures under

load, the EH-Link can be self powered from a tiny generator.

The EH-Link can operate from high impedance AC or DC

sources, in the range of 3.0 V to 20 V.

The ultralow voltage (ULV) input of the EH-Linkcan be powered

from Peltier Thermoelectric Generators ( TEGs), or thermopiles.

The EH-Link can operate from as low as 0.02 Vdc and up to 0.6

Vdc making the node operable from temperature dierentials

below 5 C with TEGs. It can also operate in ambient light levels

well below that required for solar cell use with traditional

electronics, due to the ultra low input voltage converter.

Sophisticated energy conversion and conservation methods

allow the EH-Link to operate from a fraction of the power

normally required for a wireless sensor node, providing seamless

operation within the network, when used in environments

where only low ambient energy is available.

The module is versatile and is designed to operate as part of

MicroStrains 802.15.4 wireless sensor network. Each node in

the wireless network is assigned a unique 16 bit address or an

optional 96 bit EPC code for self powered active sensor-RFID

applications.

Applications

environmental monitoring

conditioned based maintenance (CBM)

structural health monitoring (SHM)

HVAC

building automation

monitoring industrial processes

cold storage monitoring

Features & Benefts no batteries required, EH-Link is self powered from high

impedance AC and DC sources or low voltage DC sources as

low as 20 mV out-of-the-box wireless sensing capability for most analog

sensors

2.4 GHz direct sequence spread spectrum IEEE 802.15.4

radio operates in license free band world wide

communications range up to 70 m line of sight

supports auxiliary storage options such as supercapacitors

or rechargeable thin lm batteries (TFB)

supports multiple nodes at sample rates up to 2048 Hz

Sensor Support external strain gauges

bridge sensors (pressure sensors, load cells, etc.)

pulsed DC excitation pin to provide power for external

sensors

onboard relative humidity & temperature sensor

onboard three axis accelerometer

Harvester SupportStandard Voltage Input

piezoelectric

inductive

EM eld

AC or DC sources that produce > 5 V instantaneous opencircuit voltage

Ultralow Voltage Input

thermoelectric generators

low voltage solar cells

low voltage DC sources (as low as 20 mV)

www.microstrain.co

Patents Issued and Pend

8/8/2019 EH Link Datasheet Rev 1

2/2

2009, MicroStrain, Inc., Williston, VT All Rights Reserved.

EH-Linkand MICROSTRAIN are registered trademarks of MicroStrain, Inc.

Specications are subject to change without notice.

Version 1.01n

EH-Link 2.4 GHz Energy Harvesting Wireless Node

MicroStrain Inc.

459 Hurricane Lane, Suite 102

Williston, VT 05495 USA

www.microstrain.com

microprocessorw/ embeddedsoftware algorithms

A/D converter

(12 bit)2.4 GHz RFTransceiver

PGA

antialiasinglter

oset

* Optional on-board bridge completion

Gnd +2.5 volts(regulated,pulsed)

instamp

n

*

1 dierential input

USB/

RS 232

2.4 GHz

RF transceiver

PC or

WSDA

2 MBytesash memory

256 KBytes high speedFRAM memory

precision

timekeeperrectier/energy

management circuit

piezoelectric

harvester

High freq

strain/vibration

energy

external

energy

storage

on-boarddigitaltemperature& relativehumiditysensor

embedded EEPROM

parameters, 32 bit ID

sensor cal. coe., lter

x

y

z

on-boarddigitaltriaxialaccelerometer

Analoginput0-3V FS

inductive

harvester

Low freq

vibration,

EM eld energy

photovoltaic

harvester

Solar

energy

thermoelectric

harvester

Thermal

energy

1 2 3 4

1

AC voltage

input range

(+/-3 to 20V)

2

AC voltage

input range

(+/-3 to 20V)

3

DC voltage

input range

(3 to 20V)

4

DC voltage

input range

(20mV to 600mV)

Items shown in gray are not included on-board

but may be connected to the EH-Link by the customer

on-board

energy storage

capacitor

P2

P3

1 2 3 4 5 6 7 8

VXC IN + IN - GND G1 sense CH3 GND cong

PZ1 PZ2 ULV + ULV - CDV - CDV + Supercap+

GND

9 10

reserved reserved

SC-HV

+GND

P2 Pin 1, 2

P3 Pin 2

P3 Pin 6

CH3

P3 Pin 3

P3 Pin 1P3 Pin 4

P2 Pin 3, 4

piezoelectric

harvester

Impulse impact

energy/capacitive

discharge voltage

(CDV)

5P2 Pin 5, 6

5

AC voltage

input range

(20 V to 130 V)

Patents Issued and Pend

ph: 800-449-3878

fax : 802-863-4093

sales@microstrain.co

Specifcations

Energy harvester inputs:Wide range voltage (WRV)Capacitive discharge voltage (CDV)Ultralow voltage (ULV)

3-20 VAC or VDC (piezoelectric, electrodynamic, photovoltaic, electromagnetic)20-130 VAC (pulsed piezoelectric)20-600 mVDC (thermoelectric, Peltier, thermopile)

Embedded Sensors onboard triaxial accelerometer, relative humidity and temperature sensor, external single channel dierential (Wheatstone

bridge) input

DC bridge excitation regulated +2.5 volts DC at 50 mA maximum (pulsed to sensors for sample rates of 100 Hz and below to conserve power)

Analog to digital (A/D) converter successive approximation type, 12 bit resolution

Data storage capacity 2 megabytes (approximately 1,000,000 data points)

Data logging sample rate log up to 1,000,000 data points (from 100 to 65,500 samples or continuous) at 32 Hz to 2048 Hz

Wireless sample rates 1 sample/hour to 2048 Hz, with single RF channel

Sample rate stability 3 ppm

Radio frequency (RF) transceiver carrier IEEE 802.15.4, open communication architecture, 2.4 GHz direct sequence spread spectrum, license free worldwide (2.405 to2.480 GHz) - 16 channels. radiated power 0dBm (1mW)

Range for bi-directional RF link 70 m line-of-sight with radiated transmit power level of 0 dBm (1 mW)

Energy use startup: 1 2 J; m easurement mode: accel - 105 J/measurement, relative humidity sensor - 105 J/measurement, Wheatstonebridge - 168 J/measurement; data transmission: 92.4 J/packet

Operating temperature -20 C to +60 C with standard internal battery and enclosure, extended temperature range optional with custom battery andenclosure, -40 C to +85 C for electronics only

Operating humidity 0-95% non-condensing

Maximum acceleration limit 500g standard (high goption available)

Dimensions/weight standard congurations: 76 mm x 25 mm x 15 mm , 30 grams

Software Node Commander Windows XP/Vista compatible

Compatible base stations USB, RS-232, Analog, WSDA

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