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  • Multiplexing LED Drive and 4x4 Keypad Sampling
    Many applications require driving LEDs along with an interface to a keypad. Implementing such designs usually involves using up significant amounts of the processors I/O lines. This application note describes a method which uses only 16 I/O pins of a PIC16C5X microcontroller to sample a 4x4 keypad
  • Interfacing a 4x4 Matrix Keypad with an 8-Bit GPIO Expander
    AN1081 Interfacing a 4x4 Matrix Keypad with an 8-Bit GPIO Expander * I/O Direction Register (IODIR): The IODIR Author: Mike Curran register controls the direction of the port pins. A Microchip Technology Inc. high on the corresponding bit configures the pin as an input and a low configures
  • Success Story: Zero maintenance, explosion-proof fuel dispenser keypads that keep the gas flowing safely in all conditions
    , sea water, fuels and chemicals - and need to function reliably at all times. Everswitch was approached by the product team of a fuel dispenser manufacturer to develop a rugged keypad to control fuel dispensing, capable of safe usage in close proximity to flammable liquids, that would eliminate
  • Success Story: For petroleum industry equipment, ultra-reliable piezo switches & keypads are the first choice for achieving close to 100% production uptime
    . The company 's products play an integral part in refining and storage of crude oil, gasoline and fuel. In order to avoid costly production downtime due to repair and maintenance, Equipetrol Venezuela was looking for a keypad that could provide flawless, maintenance-free operation even under the harsh
  • The Drive for Simplicity: Defining Trends in Motor Drives
    By Ilpo Ruohonen, Mika Paakkonen, Mikko S. Koskinen ABB's R &D team scrutinized every -aspect of how a user interfaces with a drive and developed what it believes is the most user-friendly keypad ever. The keypad for the ABB standard drive features only eight soft keys, through which all parameters
  • Food Depositor Machine
    TRM helped a food machine manufacturer to automate a dough depositor machine by using a 3 axis motion controller with colour screen and keypad
  • Programming Variable Frequency Drives for Variable-Torque Applications
    Variable frequency drives have an incredible amount of functionality. Due to advancements in technology over the years, HMIs in the form of VFD keypads have become more user friendly with easier navigation, higher resolution displays, and more detailed setup wizards.
  • Jog Circuit for the SP500 Drive: Setup and Configuration
    The success of the SP500 as an AC PWM drive can largely be attributed to its ease of set-up and configuration. Unlike the newer AC drives, however, neither the keypad nor the terminal board offered a dedicated jog PB. Should the need arise, jog functionality can be achieved by the methods discussed
  • Auto-Manual Selection Control: Drive Set-Up and Configuration
    Equipment users often desire to interface our drives products to an auto-manual selector switch. Typically, this will involve a remote reference for the drive in the auto mode and a potentiometer or local reference in manual mode. There is an auto-manual keypad selection for the GV3000/SE
  • The Drive for Simplicity: Defining Trends in Motor Drives
    and cheaper for its customers. By combining functions and cutting part counts, ABB has reduced the size of its drives while enhancing their reliability. The company has also developed a simplified set-up procedure using a harmonized keypad and software wizards that can be used across the ABB drive
  • Success Story: Reinventing the luxury microwave oven category with control panels that embody form and function
    In the white appliances market, user experience, appearance and design are important in creating differentiation among brands. While membrane controls and capacitive keypads are the industry standard, these options prevent manufacturers from designing a unified fascia appearance. Furthermore
  • Implementing Wake Up on Keystroke
    Microchip's PIC16CXXX microcontroller family are ideally suited to directly interface to a keypad. The high 4-bits of PORTB (RB7:RB4) have internal pull-ups and can trigger a ?change on state? interrupt. This interrupt, if enabled, will wake the microcontroller from SLEEP. In most battery powered
  • Using KEELOQ (R) to generate Hopping Passwords
    The purpose of this application note is to demonstrate how KEELOQ (R) code hopping technology can be conveniently employed to implement an automatic code hopping password generator/keypad. Using a PIC12C508, the hopping code produced by an HCS300 is converted to a string of 16 hex digits
  • Using the Port B Interrupt on Change as an External Interrupt
    with the software programmable weak internal pull-ups, a direct interface to a keypad is possible. This is shown in application note AN552, Implementing Wake-up on Key Stroke. Another way to use the ?interrupt on change? feature would be as additional external interrupt sources. This allows PIC16CXXX devices

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