Functional Specifications for a Wearable Proximity Detector to Aid
Contents
1. R2 1 4 II The system must accept any interference received including interference that may cause undesired operation R2 1 5 I The system must be easily operable by a visually impaired blind user R2 1 6 I The device will have a portable power source R2 1 7 I The proof of concept must meet the applicable testing standards of CSA Class B consumer electronics appliances as required by Industry Canada to qualify for sale and distribution in Canada R2 1 8 I The proof of concept must comply with all CSA C22 2 No 1010 92 safety standards R2 1 9 I The PROXIMIview Technologies device support must comply with CSA customer service standard for people with disabilities of Class B No 480 02 R2 1 10 I All electrical parts and wiring shall conform to the specifications outlined in C22 2 No 203 1 94 Manufactured Wiring Products and C22 2 No 0 3 01 Test Methods for Electrical Wires and Cables Copyright 201 PROXIMIview Technologies 4 O Simon Fraser University EJ 8888 University Drive PROM gt Technologies 3 1 Wearable Sensor Unit In this section we will discuss various System Requirements for the Sunglasses and Sensor Unit for our product As seen above our product is divided into two units the sunglasses sensor unit and the control unit We will proceed further with a brief explanation of the use of sensors on sunglasses We proposed to mount the three ultrasonic sensors on the sunglasses The design was chosen2. accuracy measurement will be made to figure out functional specifications of the sensor such as detection range and the wide angle range Functionality of sensor will be tested between 0 70 C which is the operational temperature of the sensor 5 14 Mini Speaker 15mm LilyPad Vibrator Board control and power switch Using a multimeter component functionality will be tested for different temperature settings 5 2 Prototype Integration Testing Stage 5 2 1 Functionality Accuracy Integrated prototype will be tested on a hall way where the visually impaired test subject wearing the assistive device will try to maneuver around eye level objects Accuracy measurements of object detection and feedback time will be made and improved through efficient programming of the Arduino board A number of functionality tests will be carried out e Functionality of all sensors audio feedback when sensors malfunction f i i 1 Copyright 201 PROXIMIview Technologies E o Simon Fraser University 2 8888 University Drive PREMIE at Technologies e Operation under all mentioned scenarios e Function of the vibrator module e Battery level audio feedback e Power Consumption Power requirement calculations will be carried out and a tentative battery life measurement will be provided to supply a voltage above 7V to the Arduino board as the outputs of the Arduino will be unstable if the voltage is less than 7V Circuit will be improved to
3. id 760 amp part i d 4198 Oct 13 2011 2 CSA Standards Internet http shop csa ca en canada measurement control and signaling apparatus cancsa c222 N0 61010 2 032 04r09 invt 27021072004 Oct 13 2011 3 Facts on Seeing Limitations Internet http www statcan gc ca pub 89 628 x 2009013 fs fi fs fi eng htm Oct 13 2011 4 PARALLAX INC n d PING Ultrasonic Sensor Online Available http www parallax com tabid 768 ProductID 92 Default aspx Oct 13 2011 5 Winbond Electronics Corp 2004 ISD 4003 Series Online Available http hackedgadgets com wp content 2 Winbond ISD4003 05MS pdf Oct 13 2011 Copyright 201 PROXIMIview Technologies Nu 14
4. in order to focus on helping the visually impaired detect objects at eye level The following are the physical electrical safety and environmental requirements for the sunglasses sensor unit 3 11 Physical Requirements R3 1 1 1 I The sunglass sensor unit will have dimensions of 10cm x 8cm x 4cm R3 1 1 2 IT The unit shall not weigh more than 80gm which includes the weight of 3 sensors approx 27g and sunglasses of approx 45gm R3 1 1 3 I The range of the ultrasonic sensor varies from 2 centimeters to 3 meters R3 1 1 4 INI There shall be no buttons only the sunglasses with the three sensors mounted in it and wires running down to the control unit R3 1 1 5 IT The unit will be weather resistant and water resistant R3 1 1 6 IT The sunglasses are going have a high tensile strength to bear the weight of sensors 3 1 2 Electrical Requirements R3 1 2 1 I The three sensors will operate at 5V respectively R3 1 2 2 I The maximum current for the sensors will be 35mA R3 1 2 3 I Short bursts of reading at every 200us at 40kHz which is sufficiently fast 3 13 Safety Requirements R3 1 3 1 I The wires running down to the control unit are electrically insulated R3 1 3 2 I No harmful emissions from the sensors as per Canadian Health Standards R3 1 3 3 I Burst Frequency of 40kHz which is higher than the human auditory upper limit of 20kHz O Y Copyright 201 PROXIMIview Technologies 3 DE o Simon F
5. weatherproof enclosure that is designed to be worn via a strap or kept in the user s pocket during device operation The enclosure is to have a simple ON OFF switch a 3 5 mm headphone jack and a removable cover for battery access Volume control for the speaker and headphones will also be included Copyright 20n PROXIMIview Technologies Ni A Simon Fraser University 8888 University Drive Burnaby BC V5A 156 Technologies Figure 2 2 shows the positioning of the device on the user s head IV Figure 2 2 User Wearing the Device The entire system will be powered by a single rechargeable 9 volt PP3 battery using snap connectors which allow for obvious battery polarization and prevent incorrect battery installation when being replaced by a visually impaired person In order to not leave the user with dying dead batteries a low battery indicator will also be included again providing vibratory and audio feedback of the battery s state The PROXIMIview system overview is provided in Figure 2 3 Figure 2 3 System Block Diagram Copyright 201 PROXIMIview Technologies D o Simon Fraser University t 8888 University Drive PROM gt Technologies 2 1 Overall System Specifications R2 1 1 II The system must operate over a temperature range of 40 C to 50 C R2 1 2 II The system must operate over a relative humidity range of 5 to 95 R2 1 3 I The system must not cause harmful interference
6. D o Simon Fraser University EP 8888 University Drive PROMINS gt Technologies h October 13 2011 Dr Andrew Rawicz School of Engineering Science Simon Fraser University Burnaby BC V5A 186 Re Functional Specifications for Proximity Detector for the Visually Impaired Dear Dr Rawicz Please find enclosed the functional specifications for PROXIMIview Technologies Wearable Proximity Detector for the visually impaired The purpose of the device is to aid the user in avoiding obstacles via tactile and auditory feedback by utilizing an array of ultrasonic sensors mounted on sunglasses Our system is designed to be aesthetically pleasing and metrics such as accuracy performance ease of use and reliability have been important considerations The comprehensive set of functional requirements in the enclosed document will be used extensively by our team at PROXIMIview Technologies for the implementation of the proof of concept device as well as for integrating and testing purposes It will also be used as a guideline to assess the progress of development PROXIMIview Technologies is comprised of four talented dynamic and motivated engineering students namely Renuka Rani Gary Brykov Sajith Kulasekare and Marish Lalwani If you have any questions or concerns please feel to contact me by phone 778 321 3761 or by e mail PROXIMIview gmail com Thank you very much for your consideration Yours sincerely DE Renuka Rani Chief Ex
7. aae cganaessosasocassotecsuenssavenaparcuse 5 3 1 3 Safety Requirements osicinciisitaiiendsscion ates annemede 5 3 1 4 Environmental Requirements 0 ccccccescessesseeseeeseeseeceesecceeseceeeeseceaeeaeeeaeeaeceseeaeenseensenes 6 31 5 SC TS EN 6 3 2 Control Feedback Power Unitusssnsmrenmasmessemnnsusesussennnvnmvinu ver 6 321 Pisa Requirements cciiinnaiciaiiinaiuuiiancnancdinnnameuaenmeanaancains 6 3 2 2 Electrical Reg ute Se osbe cocsceutesnevercescaysed autcordoresenstescoreuteneiueussponeredaaneysiaauernntnetnneiuceeetestiues 7 3 2 3 Safety Requirements gags cn west neta casei swans cesta sed seca ESEE EEEE EASE 7 3 2 4 Environmental Requirements sicisccsccssicssscssisssccssacecasannsansanncsasnensasannssaseonssatsenssantensanncusssaneencenns 7 3 2 5 Mechanical Requirementts 0 ccccccecceseesseeseeseeeseceeeesecceeseceeeaeceaeeaeceaeeaeceaeeaeseaeeaeenaeeaeenss 8 325 Standards NNN NE NENNE MEN 8 3 3 Reliability and Durability spices sessed ceases 8 4 0 User Interface and Documentation arrrnnvrrnvrrnnrrnnvrnnvrrnnrrsnvrrnnrranrrnnvrrnnrrennrnnnrrnnrrsnnrnnnrrnnrrsnessnvrsnnnssnsssnnne 9 Ai Userlntertace EN EEE NE NE NENNE EE NE 9 43 Documentation eenen a a E Eae 10 Copyright 201 PROXIMIview Technologies ii O Simon Fraser University 8888 University Drive PROMI gt Technologies NNN 1 51 Component Testing Stage veven amanda u 5 1 1 Arduino Microcontroller srronvrrnvrrnnrrnnvrrnvrrnnrrnnv
8. ble Proximity Detector by PROXIMIview Technologies is an assistive device for the visually impaired to aid the user in avoiding objects obstacles The device will utilize an array of ultrasonic sensors which will be mounted on sunglasses to inform the user when an object is a certain distance away The feedback unit will feature both tactile and auditory elements a vibrating unit will be used to alert the user of the relative proximity of the object the closer the user gets to the object the more frequent the vibrations Auditory feedback will be composed of messages informing the user about the distance of the object as well as some directional messages The requirements for the Wearable Proximity Detector as proposed by PROXIMIview Technologies are outlined in the following document 1 1 Scope This document describes the functional requirements for the Wearable Proximity Detector It provides a detailed description of the required functionality for a proof of concept mode and also gives a fair idea of the same for the production device The requirements outlined in the document will be used by the PROXIMIview team during the design implementation and testing of the proof of concept device 1 2 Intended Audience The functional specifications document is intended to be used by members of the PROXIMIview team to track progress requirements and developmental phases to ensure that the design is within specifications It will also be used to com
9. de audio feedback to the user when battery level goes below 7V R3 3 5 II For the ATMEGA328P chip projected data retention failure rate is less that 1PPM over 20 years at years at 85 C or 100 years at 25 C 1 R3 3 6 I The ISD4003 voice chip will be functional on a temperature range of 65 C to 150 C 5 R3 3 7 I PING sensor will function in a temperature range of 32 to 158 F o to 70 C 4 R3 3 8 II 9V rechargeable battery will be used to supply power to the device which will have built in circuitry to control overcharging and over discharging of the battery Copyright 201 PROXIMIview Technologies 8 DE o Simon Fraser University 8888 University Drive PROMI gt Technologies 4 1 User Interface The PROXIMIview device aims to simplify user operation as much as possible Because use of the device is intended for visually impaired individuals successful operation of the device must be possible without any visual cues The following specifications outline the physical user interface of the PROXIMIview wearable proximity detector R4 1 1 I The system start up shutdown switch shall be easily accessed using sense of touch alone R4 1 2 I The system start up shutdown switch shall not be prone to accidental toggling during device operation R4 1 3 I The device volume controls shall be easily controlled using sense of touch alone R4 1 4 I The device should not impede the user s mobility any more t
10. e enclosure will not have any sharp edges that may potentially harm the user R3 2 3 5 I Electrical components in unit will not cause any harmful interference R3 2 3 6 I The unit must not exceed 35 C during normal operation or system failure R3 2 3 7 I Speaker will not exceed 65 dB 3 2 3 Environmental Requirements R3 2 3 1 IT Double Layered insulation ensures no heat dissipation in the surroundings R3 2 3 2 IT No harmful noise will be generated R3 2 3 3 HI Maximum effort will be made to use recyclable components Copyright 201 PROXIMIview Technologies 7 D o Simon Fraser University 8888 University Drive PROMI gt Technologies 3 2 5 Mechanical Requirements R3 2 5 1 I Operation buttons will be placed apart from each other R3 2 5 2 I Power button will be placed away from the operation buttons R3 2 5 3 I Power button will not be easy to press toggle 3 2 6 Standards R3 2 6 1 IM The control unit will conform to CAN CSA C22 2 NO 61010 2 032 04 Rog 2 R3 2 6 2 III The control unit will conform to ANSI standards 3 3 Reliability and Durability R3 3 1 I The assistive device will be water proof and will provide assistance under all weather conditions R3 3 2 I Sensor will accurately detect objects under all lighting conditions R3 3 3 I Sanity checks shall be programmed into the Arduino Uno to provide feedback when sensors malfunction R3 3 4 I Battery level indicator will provi
11. ecutive Officer CEO PROXIMIview Technologies Ltd Enclosed Functional Specifications for Proximity Detector for the Visually Impaired Copyright 201 PROXIMIview Technologies er WU ii Contact Person Gary Brykov gba2Qsfu ca Submitted To Andrew Rawicz ENSC 440 Mike Sjoerdsma ENSC 305 School of Engineering Science Simon Fraser University Issue Date October 13 2011 Simon Fraser Universi Simon Fraser University d 8888 University Drive Vey Burnaby BC V5A 156 TATTY Renuka Rani CEO Sajith Kulasekare CTO Gary Brykov CFO Marish Lalwani COO Copyright 20u PROXIMIview Technologies DE o Simon Fraser University 8888 University Drive PROMI gt Technologies Statistics have shown that out of the 836 000 Canadians 78 5 have a mild to medium severity and the rest of the 21 5 are severely visually impaired 3 This makes visually impaired people very vulnerable to mishaps such as accidents Therefore here lies the need for assistive devices Hence the severely impaired people would use the assistive devices than the people with mild to medium limitations Statistics have pointed out a very important fact which gives the relationship between the need versus availability of these assistive devices for the visually impaired of the mild to medium and the severe categories According to Statistics Canada 19 6 i e one in every five people with a severely impaired vision demanded the
12. genuine technological solution which would be robust and would not be susceptible to various common fallacies We would diligently work in a scheduled manner and plan to finish up the final product by December 201 Copyright 201 PROXIMIview Technologies i O Simon Fraser University EJ 8888 University Drive PREMIE gt gt gt Technologies TABLE OF CONTENTS Executive SUMMATY sissies a isco e a e ve Us Wate E E E ETES i KE RR iv b 1 SPE 1 1 2 Intended AMG ten Ce ccs ccuncesscenvcnsanicescdndscuivendtundenadsunssaiiieesvendtenduundenndennetaaessaisunsaniijendtsadentdouneinaticatantectianss 1 1 3 Classification of Requirements esrrrnvonnronvonnrenvrnnrenvennesnnensesnnesneennesnsennesnsennesnsensesnsennssnnennesnnennssnnennee 1 2 0 System Overview rrrnrnrnnonnrnnennrnnnnrnnennrnnennrnennrnnennrnnsnnrnesnrnnsnnnnnsnnnnssnrenennrnnsnnnnesnnenennrnesnnrneennanennrnnsnnrnesnnssees 2 2 1 Overall System Requirements sornvronvonnronvennrenvennrsnvenneennesneennesnsennesnsennesneennesnnensesnnennesnnesnssnnesnssnnenne 4 3 0 System Requirements 5 3 1 Wearable Sensor Unit rsorrnvrrnvrronrrrnvrrnnrrnnvrrnvrrnnrrrnvrrnnrrsnvrsnvrrnnnrsnvrsnvrrnnnssnnssnvrssnnssnsssnvssnvnsensssnvssnnssen 5 31 1 Physical Requirements ois scseissescccssessssssssansessssesssannesssasnsensunnnstansnastsnsnnsssiassscastastenssecsteantsaabeanseans 5 3 1 2 Electrical Re quit Cities ois sccscccsocssccseescncsonesanascconcsossvocsoasanedascsosas
13. han a regular pair of sunglasses R4 1 5 II The use of preferred feedback auditory or tactile or both shall be chosen by the user via an unambiguous mechanism R4 1 6 I The auditory feedback shall be clear and accurate upon detection of obstacles R4 1 7 III The user shall be notified via a preferred feedback method regarding the battery s 50 25 10 and 5 charge status R4 1 8 I All options and features of the system shall be fully accessible by a blind individual Copyright 201 PROXIMIview Technologies 9 O Simon Fraser University s 8888 University Drive PROM gt Technologies 42 Documentation The PROXIMIview wearable proximity detector proof of concept system training and documentation will be focused on educating a visually impaired user on how to properly and effectively utilize the device to increase the user s perception of the surroundings Included with the wearable proximity detector the PROXIMIview user will receive a 5 to 10 page manual with instructions written instructions written in English A Braille version of the user s manual shall also be included along with an audio CD containing operating instructions that can be played back on a disc player or computer The written user s manual the Braille user s manual and the audio user s manual will all contain identical content which is broken down into the following sections Product Introduction Safety Information Initial Setu
14. need for assistive devices but said that they were not available Although 6 1 of the mild to medium population have been proactively participating in purchasing the products available in the market they have showed their grievances regarding the availability of such products Another interesting fact that showed up was the cost factor of these products 38 of the population said that the exorbitant prices of these products hindered them from using these glasses 3 Our goal for this project is the betterment of human society and helping the needy We aim to build a device with that acts as a proximity detector for the objects for the visually impaired This device would alert the user through a feedback unit composed of a vibrator and an automated voice message that would let the user know about the direction of the object relative to user s position We have split the project up into four stages namely design development integration testing the proof of concept The development of our product will occur in two phases namely e Mounting the sensors on the sunglasses and connecting them to the control unit e Developing the Control Unit which controls the sensing as the input of the sensors is fed in Therefore this document outlines the general physical electrical and other functional specifications of our product as a planned approach by our company PROXIMIview Technologies We would ensure to address various critical issues and provide a
15. operate efficiently providing a longer battery life 5 2 2 Structural Strength and Durability Number of drop tests pressure tests and temperature tests will be carried out to analyze the structural integrity of the device Weather testing will be carried out to ensure functionality of the assistive device under numerous weather conditions 5 2 3 Safety and Comfort Testing will be carried out to provide high safety and comfort levels for the visually impaired Further testing will be carried out to improve aesthetic appeal of the device Copyright 201 PROXIMIview Technologies 12 Simon Fraser University 8888 University Drive TEN Burnaby BC V5A 156 Technologies The functional specifications demonstrate the capabilities and the requirements of our product We at PROXIMIview Technologies Ltd will strive hard to follow and abide by the requirements to bring out a robust product As mentioned above the development of our final product would take place in two phases namely the sunglasses sensor unit and the main Control Unit The prototype development is well underway and we are expected to have a complete and working prototype by December 15 2011 Copyright 201 PROXIMIview Technologies Simon Fraser University EJ 8888 University Drive PRD S808 Technologies 1 ATMEL n d ATmega328P Online Available http www atmel com dyn products product docs asp category id 163 amp family id 607 amp subfamily
16. p and Calibration Operation Instructions Feedback Interpretation Recharging Replacing the Battery Troubleshooting Technical Information SNAWAWN Legal Copyright 201 PROXIMIview Technologies 10 O Simon Fraser University EJ 8888 University Drive PROM gt Technologies PROXIMIview Technologies is focused on providing assistive devices for the visually impaired which combines functionality accuracy aesthetic appeal and comfort To provide products of the highest caliber our products will be rigorously tested from the smallest component to the final product Testing will be carried out in two different stages namely Component Testing Stage and Prototype integration Testing stage 5 1 Component Testing Stage All components involved in the final product will be meticulously tested for functionality and accuracy before the integration stage 5 11 Arduino Microcontroller A thorough test will be carried out to check the functionality of the voltage supply 7 10V and the functionality of the Digital input output pins 4omA per pin under different temperature conditions 5 1 2 Arduino VoiceShield VoiceShield will be mounted on top of the Arduino Uno and will be powered by the same voltage supply Feedback response time will be measured and efforts will be made to minimize response time in different temperatures 5 1 3 PING 28015 Ultrasonic Sensor PING sensor will be connected to the Arduino Uno and
17. pare the proof of concept device with the proposed design 1 3 Classification of Requirements The following convention will be utilized throughout this document to outline different categories of functional requirements R n p where denotes the section number n denotes the requirement number and p denotes the priority of the specification and can have one of the following values I High Priority level II Moderate Priority Level III Low Priority Level Copyright 201 PROXIMIview Technologies Simon Fraser University 8888 University Drive PRD S803 Technologies The PROXIMIview Wearable Proximity Detector utilizes three PING ultrasonic sensors mounted on a pair of sunglasses to alert the user of any obstacles at eye level The first sensor is mounted looking directly forward from the user s perspective The second sensor is mounted orthogonally to the first facing left from the user s perspective The third sensor is mounted orthogonally to the first facing right from the user s perspective Figure 2 1 illustrates the sensor arrangement A men Figure 2 1 Ultrasonic Sensor Arrangement The sensor wiring will be integrated into the sunglass frame and will run down into the control module The control module contains the Arduino Uno Microcontroller unit the Arduino VoiceShield speaker vibrator and battery unit The control module and relevant components will be contained in a robust
18. raser University e 8888 University Drive PROMI Ses Technologies 3 1 4 Environmental Requirements R3 1 4 1 I Sunglasses are made from recyclable material R3 1 4 2 II Use of digital components which would ensure no harmful substances released in the environment R3 1 4 3 IT Double Layered insulation ensures no heat dissipation in the surroundings R3 1 4 4 IT No harmful noise will be generated 3 15 Standards R3 1 5 1 III The sensors shall conform to CAN CSA C22 2 NO 61010 2 032 04 Rog 2 R3 1 5 2 II The sunglasses sensors shall conform to ANSI standards 3 2 Control Feedback Power Unit This unit is composed of the Arduino Uno Board the VoiceShield the battery unit speaker and vibrator all of which will be contained within a well insulated enclosure The following are the physical electrical safety and environmental requirements for the unit 3 2 1 Physical Requirements R3 2 1 1 I The box will not exceed 12cm x 10cm x 6cm in size R3 2 1 2 I The weight of the enclosure will be no more than 500gm R3 2 1 3 IT The finalized device will be pocket sized and easy to carry R3 2 1 4 II The enclosure will be aesthetically pleasing to the eye R3 2 1 5 I All internal components will be protected and insulated from static and shock R3 2 1 6 I The enclosure will be made of an insulating material R3 2 1 7 IT The enclosure will be durable and resistant to cracks breaks R3 2 1 8 HI The enclos
19. rrnvrrnnvrnnvrnnvrrnnnrnnnrrnnnrnnnrnnvrrnnennnnssnnssnnnssnnnn u 5 1 2 Ard ino VOICES CN gsc cn ctenccndtcottcadin site ndsnatiladichs Gund tendhuled Send Seb Sxadhaedbabdbcndtenten isasicadsendtindads ii 5 1 3 PING 28015 Ultrasonic Senso sos oiccnnnndecsmanannn dss 11 5 1 4 Mini Speaker 15mm LilyPad Vibrator Board Control and Power Switch 1 5 2 Prototype Integration Testing Stage oxic cscssinisansoscianiandagedadeadtunddenddeddcusdabs untideladoattensianssnisenndieastensen u 5 2 1 Functionality Accuracy RR 11 5 2 2 Structural Strength and Durability ee eeeeseeneeeeeeeeeeeeeaeeaeeaeeaeeaeeaeeaeeaeeaeeaeeas 12 5 2 3 Safety and OE ee 12 6 0 Conclusio EEE 13 7 o Reed vaesee dk akk khanen 14 Copyright 201 PROXIMIview Technologies iii Simon Fraser University d 8888 University Drive Vey Burnaby BC V5A 156 Technologies List oF FIGURES Figure 2 1 Ultrasonic Sensor Arrangement sciciccscvsscsiseniesshersinsetsustnnskcastnnskenstnvedenstnentoustsintensksenterskeestashoestanckouens 2 Figure 2 2 User Wearing the PROXIMIview dGvice siiiciessessiosssosisostsesssastiasssastsssssardsssescedssssieossnsaseoasinesesavassaestoees 3 Figure 2 3 System Block Diagram eeeeeeeeeeeseeeesesrsrsrsestsrsresestsrsesttstststsetststststtststststststststttstseseetstseseesesest 3 Copyright 20u PROXIMIview Technologies DE o Simon Fraser University EJ 8888 University Drive PROM gt Technologies The Weara
20. ure will be black in color R3 2 1 9 II The enclosure will have the PROXIMIview Technologies logo on it R3 2 1 10 II The placement of the controls buttons will be user friendly Copyright 201 PROXIMIview Technologies 6 E o Simon Fraser University 8888 University Drive PROMI gt Technologies R3 2 1 11 HI The enclosure will be ergonomically designed for portability R3 2 1 12 II Connectors and wires running to the enclosure will be flexible and soft 3 2 2 Electrical Requirements R3 2 2 1 I The operating voltage for the microcontroller board will not exceed 9V R3 2 2 2 I The operating voltage for the VoiceShield will not exceed 5V R3 2 2 3 I The unit will have a dedicated circuit for battery testing to indicate low charge level R3 2 2 4 IT The unit will be made of electrically insulated materials so that it can be safe in humid conditions R3 2 2 5 I The device will be powered by a standard 9V battery R3 2 2 6 I The ATMEGA328P chip will not consume more than 0 25mA R3 2 2 6 I The ISD4003 chip will not consume more than 20mA R3 2 2 7 I The power supply must be sufficient to support continuous operation of the system 3 2 3 Safety Requirements R3 2 3 1 I All electrical components must be enclosed R3 2 3 2 I All electrical components must be shielded to protect the user R3 2 3 3 I The system will be safe to operate around people with a very low risk level R3 2 3 4 I Th
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