testing Board for PIC12F683

Posted on May 1, 2012

This microcontroller fascinated me a lot because I wanted to see what we can do with an 8-pin microcontroller (out of which 2 pins goes to power supply, so actually just 6-pins are left for I/O). So I thought of making my own learning board for this. In this project, I am first going to describe the learning board that I made, and then will demonstrate few experiments on it. Some of the features of PIC12F683: Wide operating voltage range (2.0-5.5V). Precision internal oscillator (software selectable, 8 MHz to 125 Khz). 6 I/O pins with interrupt-on-change features. Four 10-bit A/D converters. Two 8-bit and one 16-bit timers. One Capture, Compare, PWM module. In-Circuit Serial Programming. Program Memory- 2048 words, SRAM- 128 bytes, EEPROM-256 bytes

testing Board for PIC12F683
Click here to download the full size of the above Circuit.

A 9V DC input socket with power on switch Regulated +5V power supply using 7805 IC 3 output LEDs and 1 power on LED 2 input tact switches 2 potentiometers: one for analog input and the other for providing reference voltage for ADC Transistor-based TTL-RS232 level converter for serial communication. A DC motor with a transistor driver. A piezo-buzzer As you see the output LEDs have 470? current limiting resistors in series so that a PIC pin can be safely drive them. The piezo buzzer is also driven directly by a PIC pin through a series resistor. The DC motor, however, is connected as a load to the collector of S8050 transistor as the required current to drive the motor cannot be supplied by the PIC port. So, the PIC port can switch on the transistor by pulling its base HIGH and the collector current of the transistor provides the sufficient current to drive the motor. The TTL to RS232 level converter and vice-versa is achieved with two transistors and few other components. The negative voltage required for RS232 level is stolen from the RS232 port of a PC itself. Note that there is no hardware UART inside PIC12F683, so the serial data transfer from the microcontroller to PC will be possible only through a software UART through any of GP0, GP1, GP2, GP4, and GP5 ports (GP3 is input only). The transmitter and receiver port on microcontroller side are denoted by uTx and uRx, whereas on the PC side are...

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