Simple PIC USB Interface Circuit

Hardware design for USB is actually quite minimal, which is a big plus for us. However, what you quickly find out with USB is that the easy hardware design means the communication and control software is very complex, we`ll see more about that in the theory and software sections. The main devices used in the circuit are the PIC 18F4455, USB Connector and LM7805. The +5v output from the power
Simple PIC USB Interface Circuit - schematic

circuit comes from the LM7805 regulator. Notice the 47uF capacitors on the input and output. These are meant to be DC filtering capacitors, which smooth out the constant DC voltage being fed to the microcontroller from the 7805 regulator. Make sure you double check your USB pinout. A common mistake when wiring the PIC to the USB connector is getting the D+ and D- signals backwards. So if you`re sure that the PIC is running your perfect code, but the USB device isn`t coming up properly, switch D+ and D-, it might just magically fix your problem! The output LEDs will be simple `toggle` LEDs. The program running on our laptop will be able to toggle them on and off with the push of a button. The A/D circuit is a standard 3 pin, Connected to Power, Signal Out and Ground circuit. The signal output goes into RA0 which is the Analog to Digital converter. After the PIC converts this signal it should send the data to the Laptop via USB. The laptop will the visually display the trimpot`s value. The push button will do a similar thing, when the button is pushed, the laptop application should update with a notification that it has been pressed. These are simple ideas, but when done over USB they become rather complicated as we`ll see in the theory section.

Recommended videos

  • Build JDM PIC Programmer(PIC) UNDER 5$ + Circuit Download
    Duration: 0:38.
  • How to programming pic microcontroller Simple JDM programmer with circuit diagram
    Duration: 2:58.
  • Arduino Uno Tutorial Basic circuit breadboarding
    Duration: 24:01.


  • Law360 (subscription)
    Law360, New York (April 27, 2017, 11:11 AM EDT) -- Two weeks ago, the Seventh made countless employment law casebooks obsolete by upsetting decades of largely uniform precedent — both its own and those of its sister — that had
     27 April 2017
  • Reuters
    Reuters Russia's electricity plans for annexed CrimeaEuropean Union sanctions forbid the supply to Crimea of used in the energy sector. Policing EU sanctions is the responsibility of the bloc's member states. The German government has s
     27 April 2017
  • (press release) (press release) design optimises deep learning appsThe integer operations-based tech reduces data bit width of the compute units and the memory that records training results of deep learning. Fujitsu Laboratories has develope
     27 April 2017
  • SF Weekly
    SF Weekly Titans Tackle Trump Travel TacticsAs the fight plays out in two separate Courts of Appeals in San Francisco and Richmond, Va., 163 U.S. companies — most located here in the Bay Area — have signed on to the fight by
     26 April 2017
  • TechCrunch
    TechCrunch details in Uber lawsuit... submitted an 80-page list detailing the roughly 100 stolen trade secrets to the court, its attorneys quizzed Levandowski on a handful of design details, including its use of fiber laser and its spec
     26 April 2017
  • The Digital Circuit (blog)
    Enters a New (And Exciting) Phase!When The Digital was first conceived, we hoped it would become a oadly based news and review site. We wanted to set up a scoring system for consumer and prosumer , and produce credible, impartial reviews.
     26 April 2017
  • PR Newswire (press release)
    Stocks Under Scanner -- Flex Ltd, Jabil , TTM , and MSCI Inc.This Friday, has initiated reports coverage on the following equities: Flex Ltd (NASDAQ: FLEX), Jabil Inc. (NYSE: JBL), TTM Inc. (NASDAQ: TTMI), and MSCI Inc.
     21 April 2017
  • Recode
    Recode companies asked a court to reject Trump's second travel banIn a ief filed in the U.S. District Court of Appeals for the Fourth , a host of Silicon Valley heavyweights lambasted Trump's new order — his second attempt, after a
     19 April 2017
  • Reuters
    sees Q1 2017 net profit up 60-90 pctReuters is the news and media division of Thomson Reuters. Thomson Reuters is the world's largest international multimedia news agency, providing investing news, world news, business news, news, headline
     17 April 2017