Experiment No. 2: User Inputs from Tact Switches and Software UART

In this experiment, we will demonstrate how to read inputs from tact switches, and then will also show how to send character data from PIC12F683 to a desktop PC Hyper-Terminal program through UART communication. Remember that PIC12F683 doesn't have hardware UART module, so we are going to use the Soft_UART library routines from mikroC for this purpose. Regarding the Hyper-Terminal setup on PC, read this. Besides, to read the user inputs from tact switches, Button Library routines in mikroC will be used.

Snapshots of the required Library Routines from mikroC User's Manual

Setup:
The two switch inputs in our board will be connected to GP0 and GP1 port (Pins 7 and 6 respectively). GP5 (Pin 2) will be used for Software UART Tx. So here is what you need to do:

• Connect SW1 and SW2 (tact switches) to GP0 and GP1 using jumper wires,
• Connect GP5 to input Tx of TTL to RS232 Level Shifter circuit,
• Connect Rx(2) and Gnd(5) pins of a RS232 port to the board.

Experiment No. 1: 3-bit LED Up Counter

This is the first and the simplest project we are going to test on our PIC12F683 experiment board. We are going to make a 3-bit up counter that counts from 0 to 7. After 7, we are going to reset it to 0 and then start again, and so on. The 3-bit counter output will be displayed on 3-LEDs on the board. There will be a 1s delay between each up count.
Setup:
Connect GP0, GP1, and GP2 (pins 7, 6, and 5 of PIC12F683) to LEDs 3, 2, and 1 respectively.

 

Connect GPIO2, 1, 0 pins to LEDs 1, 2, 3 using jumper wires.