ARM LPC2138/48 Mini Development Board – Switches Interfacing

The board has 3 switches (SW1,SW2 & SW3) connected to port pins P0.14, P0.15 & P0.16 via jumpers J4, J5 & J6 respectively. On shorting these jumpers, the switches can be used as pull_up keys and if the jumpers are left open, then the port pins can be used independently.

Sample code to test the switches is given below. In the code, switch press is detected by polling and upon pressing a switch, its name(SW1,SW2 or SW3) gets displayed on the LCD.

Schematic

Note: To use switches, don’t forget to short the corresponding jumpers J4, J5 & J6. Leaving them open frees P0.14, P0.15 & P0.16 and can be used for any other desired purpose.

Sample Code


Topics related to ARM LPC2138/48 Mini Development Board

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  2. ARM LPC2138/48 Mini Development Board – LED Interfacing
  3. ARM LPC2138/48 Mini Development Board – LCD Interfacing
  4. ARM LPC2138/48 Mini Development Board – UART0 Interfacing
  5. ARM LPC2138/48 Mini Development Board – UART1 Interfacing
  6. ARM LPC2138/48 Mini Development Board – Switches Interfacing
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  8. ARM LPC2138/48 Mini Development Board – POT Interfacing (ADC)
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  11. ARM LPC2138/48 Mini Development Board – Internal Real Time Clock (RTC)
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