element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • About Us
  • Community Hub
    Community Hub
    • What's New on element14
    • Feedback and Support
    • Benefits of Membership
    • Personal Blogs
    • Members Area
    • Achievement Levels
  • Learn
    Learn
    • Ask an Expert
    • eBooks
    • element14 presents
    • Learning Center
    • Tech Spotlight
    • STEM Academy
    • Webinars, Training and Events
    • Learning Groups
  • Technologies
    Technologies
    • 3D Printing
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Design Challenges
    • element14 presents Projects
    • Project14
    • Arduino Projects
    • Raspberry Pi Projects
    • Project Groups
  • Products
    Products
    • Arduino
    • Avnet Boards Community
    • Dev Tools
    • Manufacturers
    • Multicomp Pro
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • Store
    Store
    • Visit Your Store
    • Choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
  • Settings
Raspberry Pi
  • Products
  • More
Raspberry Pi
Raspberry Pi Forum Raspberry Pi Project with Fingerprint Sensor and Battery Backup
  • Blog
  • Forum
  • Documents
  • Quiz
  • Events
  • Polls
  • Files
  • Members
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
Join Raspberry Pi to participate - click to join for free!
Featured Articles
Announcing Pi
Technical Specifications
Raspberry Pi FAQs
Win a Pi
Raspberry Pi Wishlist
Actions
  • Share
  • More
  • Cancel
Forum Thread Details
  • Replies 4 replies
  • Subscribers 659 subscribers
  • Views 766 views
  • Users 0 members are here
  • project
  • rpibeginner
  • raspberry_pi
  • raspberry pi
  • raspberry-pi
  • raspberrypi
  • raspberry_pi_projects
  • rpi_projects
Related

Raspberry Pi Project with Fingerprint Sensor and Battery Backup

omega_apex128
omega_apex128 9 months ago

I'm very excited as this is my first time taking on a big task.  I'm a senior in my college's EEE program and am trying to come up with an interesting design but the struggle has been real.  At the moment I'm working on implementing a fingerprint sensor with a Raspberry Pi 4 onto a kiosk that I will demo but the brunt of my demo is the battery backup system.  I've designed it so that in the event of a sudden power failure, the system will continue to work for a few hours uninterrupted.  The trouble now is actually getting it to function.  I don't know if its because I've been staring at the project in the face for the past week or if I've even been staring and working on it for the past 12 hours now, but I simply cannot get the, in my eyes, most simplest of ideas to work.  It's all sound in theory but there just must be something I'm overlooking.  I just wish I knew what it was.  I'm sure I'm not the only person that has done this.  A lot of the parts have come on modules already built so they already have the necessary resistors and capacitors and what not.  Sure I had to do some calculations to make sure nothing was getting eaten up and I didn't see anything out of the ordinary...but man...the struggle is real. I guess this is what awaits me.  How does one cope with these struggles?  Especially on time crunch deadlines.  I could use some coffee and a chiropractor.

  • Sign in to reply
  • Cancel
Parents
  • dougw
    dougw 9 months ago

    A simple UPS is to run your project off a battery and have the battery be continuously charged from the mains. When the mains fail, the system continues to run off the battery. If you show what your circuit looks like more help would be available.

    • Cancel
    • Vote Up +1 Vote Down
    • Sign in to reply
    • Cancel
Reply
  • dougw
    dougw 9 months ago

    A simple UPS is to run your project off a battery and have the battery be continuously charged from the mains. When the mains fail, the system continues to run off the battery. If you show what your circuit looks like more help would be available.

    • Cancel
    • Vote Up +1 Vote Down
    • Sign in to reply
    • Cancel
Children
  • colporteur
    colporteur 9 months ago in reply to dougw

    I have done a simple test like this. Use one line in cron to write Date to file. Run Pi on battery until dead. You see first hand results of running the system under load and what you need for sizing 

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Cancel
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2025 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube