AccessTouch

Touch sensitive keyed access controller

AccessTouch is an integrated combination key access controller featuring tough-sensitive keys for vandal-proof operation. An accompanying design blueprint is available for a complete low cost, access control product.

AccessTouch uses capacitive touch sensing technology. The PCB keyboard shown can be overlaid by a non-metallic covering. It automatically calculates signal averages to compensate for track capacitance, water splashes, etc. A buzzer output provides audio feedback as buttons are pressed.

AccessTouch is firmware for the PIC16F631 microcontroller and is available as a pre-programmed chip from electronics distributors or as a firmware download from www.hexwax.com.   

  • Low BOM cost 
  • Vandal-proof design, no parts need to be physically exposed 
  • Codes may be up to 8 digits 
  • Audio feedback on touch press 
  • Safe Controller mode available 
  • 20-pin SSOP package 

User Operation 

When the correct code is entered, the door release output is activated for a fixed time delay. The sequence of keys pressed prior to entering the code is unimportant.

To change the access code, an electrical switch is closed and the new code is entered twice. LEDs indicate ‘Open’, ‘Closed’ and ‘Set Code’ states. All LEDs turn off when the device enters a sleep state.

AccessTouch
Data Sheet