Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    PIC16F877A DIGITAL CLOCK Search Results

    PIC16F877A DIGITAL CLOCK Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    TB67S539FTG Toshiba Electronic Devices & Storage Corporation Stepping Motor Driver/Bipolar Type/Vout(V)=40/Iout(A)=2/Clock Interface Visit Toshiba Electronic Devices & Storage Corporation
    TB67S149AFTG Toshiba Electronic Devices & Storage Corporation Stepping Motor Driver/Unipolar Type/Vout(V)=84/Iout(A)=3/Clock Interface Visit Toshiba Electronic Devices & Storage Corporation
    TB67S549FTG Toshiba Electronic Devices & Storage Corporation Stepping Motor Driver/Bipolar Type/Vout(V)=40/Iout(A)=1.5/Clock Interface Visit Toshiba Electronic Devices & Storage Corporation
    TB67S589FTG Toshiba Electronic Devices & Storage Corporation Stepping Motor Driver / Bipolar Type / Vout(V)=50 / Iout(A)=3.0 / CLK input type / VQFN32 Visit Toshiba Electronic Devices & Storage Corporation
    TB67S589FNG Toshiba Electronic Devices & Storage Corporation Stepping Motor Driver / Bipolar Type / Vout(V)=50 / Iout(A)=3.0 / CLK input type / HTSSOP28 Visit Toshiba Electronic Devices & Storage Corporation

    PIC16F877A DIGITAL CLOCK Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    PIC16F877A pin

    Abstract: PIC16F877A Microcontroller PIC16F877A SPECIFICATIONS PIC16F877A PIN diagram PIC16F877A block diagram PWM using PIC16F877a c code PWM Inverter using PIC Microcontroller control dc motor speed using Pic16F877A PIC16F877A circuit diagram PIC16F877A connect to 16 pin LCD
    Text: MINI-MAX/PIC Single Board Computer Technical Manual Document Revision: 1.03 Date: 06 September 2004 BiPOM Electronics, Inc. 16301 Blue Ridge Road, Missouri City, Texas 77489 Telephone: 1-713-283-9970 Fax: 1-281-416-2806 E-mail: info@bipom.com Web: www.bipom.com


    Original     		com/files/mm51c/loader/WinLoad MCP100 PIC16C58 PIC16F877A RS-232 PIC16F877A pin PIC16F877A Microcontroller PIC16F877A SPECIFICATIONS PIC16F877A PIN diagram PIC16F877A block diagram PWM using PIC16F877a c code PWM Inverter using PIC Microcontroller control dc motor speed using Pic16F877A PIC16F877A circuit diagram PIC16F877A connect to 16 pin LCD PDF

    interfacing pic16f877a with ir sensors

    Abstract: PIC16F877A SPECIFICATIONS PIC16F72 interfacing with LCD PIC16F877A Microcontroller energy meter circuit interfacing PIC16F877A with lcd PIC16F877a SAMPLE C pwm program PIC16F877A pin lcd tutorial for pic16f877a PIC16F877A digital voltmeter pic
    Text: Utility Metering Design Solutions Complete Utility Metering Solutions Design Innovation in Gas, Water, Heat and Energy Meters Engineers face a variety of design challenges as they push new innovations within their own applications. In meter designs, innovation usually rests with increasing accuracy


    Original     		DS01008A DS01008A* interfacing pic16f877a with ir sensors PIC16F877A SPECIFICATIONS PIC16F72 interfacing with LCD PIC16F877A Microcontroller energy meter circuit interfacing PIC16F877A with lcd PIC16F877a SAMPLE C pwm program PIC16F877A pin lcd tutorial for pic16f877a PIC16F877A digital voltmeter pic PDF

    7x5 dot matrix led displays

    Abstract: arduino uno ASM117 28BYJ-48 mg995 ASM117-3 28BYJ48 4x4 matrix keypad in pic with c code PIC16F877A manual PIC 24C16
    Text: PPIC IC DDevelopment Board Ultra 2 IC + Arduino UNO USER'S GUIDE WIDE.HK page 2 PIC Development Board Ultra 2 Table of content Introduction Connectivity Introduction to PIC . . . . . . . . . . . . . . . . . . . . . . . . . . . .03 PIC sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


    Original     		WU-003 ILI9325 WU-005 WU-007 28BYJ-48 WU-004 KS0108 128x64 WU-006 MG995 7x5 dot matrix led displays arduino uno ASM117 ASM117-3 28BYJ48 4x4 matrix keypad in pic with c code PIC16F877A manual PIC 24C16 PDF

    free pic16f877a

    Abstract: PWM GENERATION using Pic16F877A PIC16F877A block diagram PWM using PIC16F877a c code PIC16F877A block diagram for digital clock PIC16F877A PIN diagram PWM using PIC16F877a PIC16F877A power on reset circuit diagram PIC16F877a pwm PIC16F877A pin
    Text: AN946 Interfacing the MCP2122 to the Host Controller Author: The 16x clock is used for the baud clock timing transmit and receive . There are 16 16x clocks (16XCLK) for each bit time. In systems that have already been designed with the HSDL-7000, the 16XCLK signal is


    Original     		AN946 MCP2122 16XCLK) HSDL-7000, 16XCLK DK-2750 D-85737 NL-5152 free pic16f877a PWM GENERATION using Pic16F877A PIC16F877A block diagram PWM using PIC16F877a c code PIC16F877A block diagram for digital clock PIC16F877A PIN diagram PWM using PIC16F877a PIC16F877A power on reset circuit diagram PIC16F877a pwm PIC16F877A pin PDF

    XILINX ft2232

    Abstract: pic16f877a manual free pic16f877a XILINX ft2232 usb jtag audio using pic16f877a FT232RQ-R XILINX ft2232 usb jtag development board PIC16F877A using temperature sensor DLP-USB245M-G FT232RL 768-1007-1-nd
    Text: UART Chips and Vinculum Host Controllers Cont. VMusic2 Modules VF2F2 Module The VMusic2 module is a product which not only lets you add USB flash disk interfacing to your product, but also allows you to play back MP3 and other popular digital music formats directly from a USB flash disk. Extensions to the Vinculum VDAP


    Original     		VS1003 DLP-2232M-G DLP-2232ML-G DLP-2232PB-G DLP-232PC DLP-245PB-G DLP-245PL-G DLP-245SY-G DLP-USB232M-G DLP-USB245M-G XILINX ft2232 pic16f877a manual free pic16f877a XILINX ft2232 usb jtag audio using pic16f877a FT232RQ-R XILINX ft2232 usb jtag development board PIC16F877A using temperature sensor DLP-USB245M-G FT232RL 768-1007-1-nd PDF

    PIC16F877A Microcontroller

    Abstract: pic16f877a full instruction set PIC16F877A pin PIC16f877a example code spi PIC16F877A Microcontroller eeprom PIC16F877A MICROCHIP cost of PIC16F877A Microcontroller PIC16F877A SPECIFICATIONS PIC16F877A 40 pin MICROCHIP PIC16F877A circuit hardware
    Text: AN975 Using the MSSP Module to Interface Microwire Serial EEPROMs to PIC16 Devices Author: This application note provides assistance and source code to ease the design process of interfacing a Microchip mid-range PIC16F877A microcontroller to a Microchip Microwire serial EEPROM. The Master


    Original     		AN975 PIC16 PIC16F877A requ34-8870 DS00975A-page PIC16F877A Microcontroller pic16f877a full instruction set PIC16F877A pin PIC16f877a example code spi PIC16F877A Microcontroller eeprom PIC16F877A MICROCHIP cost of PIC16F877A Microcontroller PIC16F877A SPECIFICATIONS PIC16F877A 40 pin MICROCHIP PIC16F877A circuit hardware PDF

    PIC16F877a parallel slave port sample code

    Abstract: interfacing PIC16F877A with buffer PIC 877A PIC16F874A/877A DATASHEET PIC 16 F 877A PIC16F877A PIN diagram PIC16f877a example code spi PIC16F877A 40 pin MICROCHIP PIC16F874A/877A port pin details of pic16f877a
    Text: PIC16F87XA PIC16F87XA Rev. B0 Silicon/Data Sheet Errata The PIC16F87XA Rev. B0 parts you have received conform functionally to the Device Data Sheet DS39582A , except for the anomalies described below. This Errata Sheet supersedes any previously published Errata for PIC16F87XA Rev. B0.


    Original     		PIC16F87XA PIC16F87XA DS39582A) 0242xxx) 28-pin PIC16F873A PIC16F876A) PIC16F877a parallel slave port sample code interfacing PIC16F877A with buffer PIC 877A PIC16F874A/877A DATASHEET PIC 16 F 877A PIC16F877A PIN diagram PIC16f877a example code spi PIC16F877A 40 pin MICROCHIP PIC16F874A/877A port pin details of pic16f877a PDF

    vending machine pic microcontroller

    Abstract: PIC16F877a SAMPLE C ir sensor counter program pic16f877a projects PIC16F877A connect to 16 pin LCD EMBEDDED C BOOKS IN PIC16F877A PIC16F877A pic16f877a manual vending machine schematic diagram PIC16F877a Programmer circuit diagram Projects and Circuits for Data Logger
    Text: MCP215X/40 Data Logger Demo Board User’s Guide 2006 Microchip Technology Inc. DS51516B Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet.


    Original     		MCP215X/40 DS51516B DS51516B-page vending machine pic microcontroller PIC16F877a SAMPLE C ir sensor counter program pic16f877a projects PIC16F877A connect to 16 pin LCD EMBEDDED C BOOKS IN PIC16F877A PIC16F877A pic16f877a manual vending machine schematic diagram PIC16F877a Programmer circuit diagram Projects and Circuits for Data Logger PDF

    PIC Light Dimmer

    Abstract: x10 pic an236 zero crossing detector PIC dimmer TRIAC dimmer pic PIC18F452 PWM example codes interfacing of PIC16F877A with 2X16 lcd pic triac PIC16F877A 2x16 LCD PWM GENERATION using Pic16F877A PIC16F877A circuit diagram
    Text: AN236 X-10 Home Automation Using the PIC16F877A Author: HARDWARE OVERVIEW Jon Burroughs Microchip Technology Inc. The home controller application described in this application note allows the user to program on and off times for up to sixteen devices, using a 2 x 16 liquid crystal


    Original     		AN236 PIC16F877A DS00236B-page PIC Light Dimmer x10 pic an236 zero crossing detector PIC dimmer TRIAC dimmer pic PIC18F452 PWM example codes interfacing of PIC16F877A with 2X16 lcd pic triac PIC16F877A 2x16 LCD PWM GENERATION using Pic16F877A PIC16F877A circuit diagram PDF

    interfacing of PIC16F877A with 2X16 lcd

    Abstract: P16F877A PIC16F877A 2x16 LCD zero crossing detector PIC dimmer interfacing PIC16F877A with lcd pic microcontroller triac control x10 pic an236 2X16 lcd module pic16f84 PIC16F877A using temperature sensor PIC16F877a instruction clock timing diagram
    Text: AN236 X-10 Home Automation Using the PIC16F877A Author: HARDWARE OVERVIEW Jon Burroughs Microchip Technology Inc. The home controller application described in this application note allows the user to program on and off times for up to sixteen devices, using a 2 x 16 liquid crystal


    Original     		AN236 PIC16F877A D-85737 DS00236A-page interfacing of PIC16F877A with 2X16 lcd P16F877A PIC16F877A 2x16 LCD zero crossing detector PIC dimmer interfacing PIC16F877A with lcd pic microcontroller triac control x10 pic an236 2X16 lcd module pic16f84 PIC16F877A using temperature sensor PIC16F877a instruction clock timing diagram PDF

    PIC16F877A PIN diagram

    Abstract: PIC 877A PIC16F874A/877A PIC16F874A/877A DATASHEET PIC 16 F 877A c programming PIC16F877A circuit diagram PIC16F87XA PIC16f877a example code spi PIC16F877A PIC16F874A
    Text: PIC16F87XA PIC16F87XA Rev. B2 Silicon/Data Sheet Errata The PIC16F87XA Rev. B2 parts you have received conform functionally to the Device Data Sheet DS39582A , except for the anomalies described below. All the problems listed here will be addressed in future


    Original     		PIC16F87XA PIC16F87XA DS39582A) DK-2750 D-85737 DS80133D-page PIC16F877A PIN diagram PIC 877A PIC16F874A/877A PIC16F874A/877A DATASHEET PIC 16 F 877A c programming PIC16F877A circuit diagram PIC16f877a example code spi PIC16F877A PIC16F874A PDF

    control dc motor using Pic16F877A

    Abstract: control dc motor speed using Pic16F877A interfacing PIC16F877A with lcd dc motor drive circuit pic16f877a x10 pic an236 PIC16F877A keypad interfacing microchip AN857 Dc motor speed Controlled with Pic16F877A PIC16F877A Microcontroller PIC18 example codes lcd
    Text: Home Appliance Solutions Electronic Solutions for Today’s Appliance Designers • • • 8-bit PIC Microcontrollers Analog Peripherals Interface Products User Interface • Touch Pads • Bar Codes • Key Pads • LED • LCD Basic Control • Clocks and Timers


    Original     		16-bit DS00241A QS-9000 control dc motor using Pic16F877A control dc motor speed using Pic16F877A interfacing PIC16F877A with lcd dc motor drive circuit pic16f877a x10 pic an236 PIC16F877A keypad interfacing microchip AN857 Dc motor speed Controlled with Pic16F877A PIC16F877A Microcontroller PIC18 example codes lcd PDF

    PIC16 example c code i2c master

    Abstract: PIC16F877A Microcontroller PIC16F877A assembly programming PIC16F877A Microcontroller eeprom sspif PIC16F877A PIC16F877A circuit hardware PIC16 family pic16f877a c code programming example PIC16F877
    Text: AN976 Using the MSSP Module to Interface I2C Serial EEPROMs with PIC16 Devices Author: This application note is intended to serve as a reference for communicating with Microchip’s 24XXX series serial EEPROM devices with the use of the MSSP module featured on many PIC16 family devices.


    Original     		AN976 PIC16 24XXX 24XXX PIC16F877A DS00976A-page PIC16 example c code i2c master PIC16F877A Microcontroller PIC16F877A assembly programming PIC16F877A Microcontroller eeprom sspif PIC16F877A circuit hardware PIC16 family pic16f877a c code programming example PIC16F877 PDF

    pic 873a

    Abstract: PIC16F877A block diagram for digital clock PIC16F877A PIN diagram PIC16F87XA embedded c programming PIC16F877A circuit diagram of counter using pic16f877a PIC16F877A block diagram PIC16F877a instruction clock timing diagram EMBEDDED C programming for PIC16F877A pic16f877a c code programming example
    Text: PIC16F87XA Flash Memory Programming Specification • PIC16F876A • PIC16F874A • PIC16F877A 1.0 PROGRAMMING THE PIC16F87XA The PIC16F87XA is programmed using a serial method. The Serial mode will allow the PIC16F87XA to be programmed while in the user’s system. This allows


    Original     		PIC16F87XA PIC16F876A PIC16F874A PIC16F877A PIC16F87XA DS39589C-page pic 873a PIC16F877A block diagram for digital clock PIC16F877A PIN diagram embedded c programming PIC16F877A circuit diagram of counter using pic16f877a PIC16F877A block diagram PIC16F877a instruction clock timing diagram EMBEDDED C programming for PIC16F877A pic16f877a c code programming example PDF

    PIC16F877A PIN diagram

    Abstract: PIC16F876A icsp PIC16F87XA pic16f877a c code programming example PIC16F877A pin PIC16F877A flow chart PIC16F877A PIN DIAGRAM DETAILS PIC16F877A block diagram PIC16F877A Microcontroller eeprom PIC16F876A
    Text: PIC16F87XA FLASH Memory Programming Specification • PIC16F876A • PIC16F874A • PIC16F877A 1.0 PROGRAMMING THE PIC16F87XA The PIC16F87XA is programmed using a serial method. The Serial mode will allow the PIC16F87XA to be programmed while in the user’s system. This allows


    Original     		PIC16F87XA PIC16F876A PIC16F874A PIC16F877A PIC16F87XA D-85737 PIC16F877A PIN diagram PIC16F876A icsp pic16f877a c code programming example PIC16F877A pin PIC16F877A flow chart PIC16F877A PIN DIAGRAM DETAILS PIC16F877A block diagram PIC16F877A Microcontroller eeprom PIC16F876A PDF

    PIC16F877A PIN diagram

    Abstract: PIC16F877A flow chart pic16f877a c code programming example PIC16F877A block diagram PIC16F873A block diagram PIC16F876A icsp PIC16F876A PIC16F87XA PIC16F874A pic16f877a motor drive source code
    Text: M PIC16F87XA FLASH Memory Programming Specification • PIC16F876A • PIC16F874A • PIC16F877A 1.0 PROGRAMMING THE PIC16F87XA The PIC16F87XA is programmed using a serial method. The Serial mode will allow the PIC16F87XA to be programmed while in the user’s system. This allows


    Original     		PIC16F87XA PIC16F876A PIC16F874A PIC16F877A PIC16F87XA D-81739 PIC16F877A PIN diagram PIC16F877A flow chart pic16f877a c code programming example PIC16F877A block diagram PIC16F873A block diagram PIC16F876A icsp PIC16F876A PIC16F874A pic16f877a motor drive source code PDF

    PIC 877A

    Abstract: PIC16f877a example code spi master configuration DS30292C PIC16f877a example code spi PIC16F873 877A PIC16F877a instruction set PIC16F873 serial communication PIC16F877A 40 pin MICROCHIP PIC18F8620
    Text: MSSP MODULE MSSP Module Silicon/Data Sheet Errata The PICmicro microcontrollers you have received all exhibit anomalous behavior in their Master SSP MSSP modules, as described in this document. They otherwise conform functionally to the descriptions provided in their respective Device Data Sheets and


    Original     		DS80131E-page PIC 877A PIC16f877a example code spi master configuration DS30292C PIC16f877a example code spi PIC16F873 877A PIC16F877a instruction set PIC16F873 serial communication PIC16F877A 40 pin MICROCHIP PIC18F8620 PDF

    PIC 877A

    Abstract: PIC16f877a example code spi master configuration PIC16F877 i2c slave PIC16f876 example codes I2C PIC16F873 Clock control PIC PIC16F873 PIC16f876 example codes PIC16F874 APPLICATION NOTE port pin details of pic16f877a PIC16F872
    Text: MSSP MODULE MSSP Module Silicon/Data Sheet Errata The PICmicro microcontrollers you have received all exhibit anomalous behavior in their Master SSP MSSP modules, as described in this document. They otherwise conform functionally to the descriptions provided in their respective Device Data Sheets and


    Original     		recognize6334-8870 DS80131D-page PIC 877A PIC16f877a example code spi master configuration PIC16F877 i2c slave PIC16f876 example codes I2C PIC16F873 Clock control PIC PIC16F873 PIC16f876 example codes PIC16F874 APPLICATION NOTE port pin details of pic16f877a PIC16F872 PDF

    PIC16F84A Free Projects metal detector

    Abstract: PIC16F628A Free Projects of LED PIC16F84A Free Projects of LED PIC16F877A Free Projects of LED METAL DETECTOR PROGRAM PIC16F84 simple heart rate monitor circuit diagram electronic PIC16F877A code lock project PIC16F876A free projects PIC16F73 Free Projects of interface with lcd PIC16F877A metal detector
    Text: Version 3 PICmicro microcontroller development board An advanced solution for learning and developing PICmicro MCU technology HP488-60-3 matrix multimedia Improvements over version 2 development board include: • USB programmable • Can be powered via USB no need for


    Original     		HP488-60-3 16F88 PIC16F84 outF877, PIC16F87, PIC16F88 PIC18F242, PIC18F248, PIC18F252, PIC18F258, PIC16F84A Free Projects metal detector PIC16F628A Free Projects of LED PIC16F84A Free Projects of LED PIC16F877A Free Projects of LED METAL DETECTOR PROGRAM PIC16F84 simple heart rate monitor circuit diagram electronic PIC16F877A code lock project PIC16F876A free projects PIC16F73 Free Projects of interface with lcd PIC16F877A metal detector PDF

    interfacing pic16f877a with ir sensors

    Abstract: can bus schematic mcp2551 microchip pic16f877a uart MCP2551 application note can bus schematic mcp2551 example mcp2510 mcp2515 interfacing PIC16F877A with encoder PIC16F877A using temperature sensor pic16f877a based spi MCP2551
    Text: Analog and Interface Product Solutions Interface Products Design Guide Using CAN, LIN and Infrared Connectivity Design ideas in this guide are based on many of the interface devices available from Microchip Technology. A complete device list and corresponding data sheets for these products can be found at www.microchip.com


    Original     		MCP2515 MCP2551 MCP250xx MCP201 MCP23016 PIC12F675 PIC18F6680 MCP2120 MCP2140 MCP215x interfacing pic16f877a with ir sensors can bus schematic mcp2551 microchip pic16f877a uart MCP2551 application note can bus schematic mcp2551 example mcp2510 mcp2515 interfacing PIC16F877A with encoder PIC16F877A using temperature sensor pic16f877a based spi MCP2551 PDF

    EMBEDDED C BOOKS IN PIC16F877A

    Abstract: PIC16F877A cordic pic16f877a c code programming example PIC16F877A circuit diagram PIC16F877A Microcontroller with LCD cordic design for fixed angle rotation ATAN TECHNOLOGY pic16f877a PIC16F877A block diagram PIC16F877A Microcontroller
    Text: AN1061 Efficient Fixed-Point Trigonometry Using CORDIC Functions For PIC16F Author: Jose Benavides Microchip Technology Inc. INTRODUCTION This application note presents an implementation of the following fixed-point math routines for the PIC16F microcontroller families:


    Original     		AN1061 PIC16F DS01061A-page EMBEDDED C BOOKS IN PIC16F877A PIC16F877A cordic pic16f877a c code programming example PIC16F877A circuit diagram PIC16F877A Microcontroller with LCD cordic design for fixed angle rotation ATAN TECHNOLOGY pic16f877a PIC16F877A block diagram PIC16F877A Microcontroller PDF

    16F877A spi

    Abstract: DAC PIC16F877 APPLICATION NOTE 25LC540 16f877A External memory interface EB013-00-2 ARCHITECTURE OF PIC16F877A PIC16f877a example code spi LED Matrix PIC Board schematic pic16f877a spi PIC16F819
    Text: E-blocks SPI board Document code: EB013-30-2 SPI Memory and D/A board datasheet EB013-00-2 Contents 1. 2. 3. 4. 5. About this document .2


    Original     		EB013-30-2 EB013-00-2 25LC540) 16F877A spi DAC PIC16F877 APPLICATION NOTE 25LC540 16f877A External memory interface EB013-00-2 ARCHITECTURE OF PIC16F877A PIC16f877a example code spi LED Matrix PIC Board schematic pic16f877a spi PIC16F819 PDF

    PIC16F87XA

    Abstract: PIC16f876A example codes PIC16F873A-876A PIC16F873A PIC16F877A data sheet DS39582B channel ADC pic16f874a PIC16F877A adc example code 876a PIC16F877A pin
    Text: PIC16F87XA PIC16F87XA Rev. B0 Silicon Errata Sheet The PIC16F87XA Rev. B0 parts you have received conform functionally to the Device Data Sheet DS39582B , except for the anomalies described below. This Errata Sheet supersedes any previously published Errata for PIC16F87XA Rev. B0.


    Original     		PIC16F87XA PIC16F87XA DS39582B) 0242xxx) 28-pin PIC16F873A PIC16F876A) PIC16f876A example codes PIC16F873A-876A PIC16F873A PIC16F877A data sheet DS39582B channel ADC pic16f874a PIC16F877A adc example code 876a PIC16F877A pin PDF

    Z-Wave Application Programming Guide

    Abstract: GSM based remote water pump control system circuit diagram PIC16F877A Microcontroller energy meter circuit PIC16F877A advantages gsm based energy meter billing IEC1107 Digital Weighing Scale using PIC microcontroller prepaid energy meter block diagram GSM based home appliance control circuit diagram PIC Microcontroller GSM Modem
    Text: Introduction to Utility Metering Tutorial 2005 Microchip Technology Inc. DS39757A Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet.


    Original     		DS39757A DS39757A-page Z-Wave Application Programming Guide GSM based remote water pump control system circuit diagram PIC16F877A Microcontroller energy meter circuit PIC16F877A advantages gsm based energy meter billing IEC1107 Digital Weighing Scale using PIC microcontroller prepaid energy meter block diagram GSM based home appliance control circuit diagram PIC Microcontroller GSM Modem PDF