PIC16F627A Touchpad circuit

  

Rating: 0.00 / 5 
Inside:
PIC Microcontroller Circuits / Microcontroller Circuits
This board layout was created using the SOIC version of a PIC16F627A without drawing the usual schematic first. Most of the part values are etched on the Layout. The SIP resistor packs I used are 10k ohm, some experimentation with this value may be useful. Three pins are provided for 5 volts, ground, and TTL serial output on a standard 3pin/0.1 inch connection. The actual data from the touch sensors is quite erratic and requires some software processing.
PIC16F627A Touchpad circuit - schematic

PIC16F627A Touchpad circuit - img1

Basically you create a pulse for each of the ports and read the data with the instruction following the pulse signlal rise. Then read the ports the same way looking for a gap of 0.1 seconds with no data detected. This does the 'debounce'. This results in fairly clean data capture from the sensors. Mostly, this is just an example of how to make your own control panels. The system can be extended to more inputs depending on how many your micro has. This design provides a telephone style layout and is programmed to send out values in 9600 baud ascii.

News


  • Seeking Alpha
    Microchip Technology (NASDAQ:MCHP) is one of the world's sales leaders in chips and related semiconductors. combine a computer with the ability to take input from sensors and then control output devices. They are now in ...
     24 June 2016
  • SYS-CON Media (press release)
    The RN4870 and RN4871 support the latest Bluetooth 4.2 specification and have a Bluetooth stack on board with a scripting engine to enable standalone operation and eliminate (MCU) use for simple applications. These next-generation
     22 June 2016
  • Elektor (blog)
    Elektor (blog) This edition includes the awaited Assembler Crash Course 2.1; following on from the three part crash course we published last year in assembler programming for , this series delves deeper with this instalment focussing on
     20 June 2016
  • E&T magazine
    PC software writing in C/C++ or C# and firmware writing in Assembler for embedded . Knowledge of Microchip and ARM processors is also desirable. Knowledge of X-Ray system design. Design of low voltage electrical control circuits.
     7 June 2016
  • CWRU Observer
    It also provides development tools that enable system designers to program for specific applications; analog, interface, mixed signal, and timing products comprising power management, linear, mixed-signal, high-voltage, thermal ...<
     5 June 2016
  • CWRU Observer
    It also provides development tools that enable system designers to program for specific applications; analog, interface, mixed signal, and timing products comprising power management, linear, mixed-signal, high-voltage, thermal ...
     3 June 2016
  • Analyst Ratings
    Its product portfolio comprises 8-bit, 16-bit, and 32-bit and 16-bit dsPIC digital signal controllers, which feature on-board Flash memory technology. The company was founded on Feuary 14, 1989 and is headquartered in Chandler, AZ.
     1 June 2016
  • EE Times
    EE Times 15) announced a new cloud-based integrated development environment (IDE) for the company's . According to Microchip (Chandler, Ariz.), the free MPLAB Xpress cloud-based IDE is the easiest way for users to get started with MCUs,&
     16 February 2016
  • Market Realist
    According to research firm Gartner (IT), Microchip (MCHP) reclaimed the top position in terms of revenue in the 8-bit segment in 2014. The company also grew its market share in 8-bit, 16-bit, and 32-bit multipoint control units (or MCUs
     3 September 2015

.


Leave Comment

characters left: