Digital clock with bcd counters

RS Components provides a versatile range of counters to suit a variety of devices and functions. With digital, electromechanical, and purely mechanical counters available, RS provides a solution to industrial, commercial and project applications wherever precise counting and tallying is required. You'll find counters available from trusted brands such as Baumer, Omron, Red Lion, Kubler, Hengstler, Trumeter and our own RS PRO selection.Functions of CountersDigital Counters, also known as Mechanical Counters, Electronic Counters or Hour Meters, store and display the frequency of an occurring process, normally synchronized with a clock. For example, Electronic Counters in particular follow a sequential logic circuit which has a clock input signal. Industrial applications of counting devices are used to measure:LengthImpulsesTime elapsedPosition IndicationSwitching and controlTypes of CounterDigital counters Digital Counters - are electronic in design and will often have a digital display. These counters work off a latching circuit or "flip-flop" when the time gets to the set value the relay will switch from 1 position to the next (flip), then the next pre-set value it will switch back (flop). It latches in each position and holds it so that current can flow.Asynchronous or ripple counters - consisting of a number of flip-flops these count a stream of pulses applied to the counter's input. The output is a binary value whose value is equal to the number of pulses received.Synchronous counters - provide a more reliable circuit for counting purposes, and for high-speed operation, as the clock pulses in this circuit are fed to every flip-flop in the chain at exactly the same time.Decade counters - used to count decimal digits rather than binary.Ring counters - have a cascade layout of flip-flops in a ring so that the output of the last is fed into the input of the first.Mechanical countersMechanical Counters - are built

31MayMay 31, 2012 A Digital Clock can be made easily by using PIC Microcontroller, DS1307 and a 16×2 LCD. I have already posted about Interfacing DS1307 RTC with PIC Microcontroller. The DS1307 RTC can work either in 24-hour mode or 12-hour mode with AM/PM indicator. It automatically adjusts for months fewer than 31 days including leap year compensation up to year 2100. DS1307 comes with built-in power sensing circuit which senses power failures and automatically switches to back up supply. We can provide a 3V CMOS Battery for that. Communication between PIC Microcontroller and DS1307 takes place through I²C Bus.Components RequiredPIC 16F877A MicrocontrollerDS1307 RTC16×2 LCD8MHz Crystal32.768KHz Crystal for RTC3V Battery2x 22pF Capacitors0.1μF Capacitor4x 10KΩ Resistors10KΩ Preset2x 2.2KΩ Resistors4.7KΩ Resistor3x Micro Switches (Push Button)5V Power SupplyPrerequisitesI recommend reading following articles before going further.LCD Interfacing with PIC MicrocontrollerInterfacing DS1307 with PIC Microcontroller Circuit Diagram – Digital ClockDigital Clock using PIC Microcontroller and DS1307 RTC – Circuit DiagramI hope that you can easily understand the circuit diagram. The circuit is powered using a 5V power supply. 8MHz crystal is connected to PIC Microcontroller to provide necessary clock for the operation. An RCR (Resistor-Capacitor-Resistor) made using 10KΩ, 0.1µF, 4.7KΩ is connected to MCLR pin of PIC Microcontroller as recommended by Microchip. It will work fine even if you tie MCLR pin directly to VDD but Microchip doesn’t recommends it. DS1307 RTC is connected to PIC microcontroller via I2C bus. Pull up resistors connected to I2C bus is very important, please make sure that you are using correct values for it. An additional power supply (usually a battery or button cell) is connected to DS1307 RTC for running the clock during power failures. This circuit will function even without that battery also but the clock will stop and reset during power failure.MikroC Code// LCD module connectionssbit LCD_RS at RB2_bit;sbit LCD_EN at RB3_bit;sbit LCD_D4 at RB4_bit;sbit LCD_D5 at RB5_bit;sbit LCD_D6 at RB6_bit;sbit LCD_D7 at RB7_bit;sbit LCD_RS_Direction at TRISB2_bit;sbit LCD_EN_Direction at TRISB3_bit;sbit LCD_D4_Direction at TRISB4_bit;sbit LCD_D5_Direction at TRISB5_bit;sbit LCD_D6_Direction at TRISB6_bit;sbit LCD_D7_Direction at TRISB7_bit;// End LCD module connections unsigned short read_ds1307(unsigned short address){ unsigned short r_data; I2C1_Start(); I2C1_Wr(0xD0); //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0 I2C1_Wr(address); I2C1_Repeated_Start(); I2C1_Wr(0xD1); //0x68 followed by 1 --> 0xD1 r_data=I2C1_Rd(0); I2C1_Stop(); return(r_data);}void write_ds1307(unsigned short address,unsigned short w_data){ I2C1_Start(); // issue I2C start signal //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0 I2C1_Wr(0xD0); // send byte via I2C (device address + W) I2C1_Wr(address); // send byte (address of DS1307 location) I2C1_Wr(w_data); // send data (data to be written) I2C1_Stop(); // issue I2C stop signal}unsigned char BCD2UpperCh(unsigned char bcd){ return ((bcd >> 4) + '0');}unsigned char BCD2LowerCh(unsigned char bcd){ return ((bcd & 0x0F) + '0');}int Binary2BCD(int a){ int t1, t2; t1 = a%10; t1 = t1 & 0x0F; a = a/10; t2 = a%10; t2 = 0x0F & t2; t2 = t2 > 4; t = 0x0F & t; r = t*10 +

Time they had set the timer … Counsel Chambers Timers and Board Room Timers keeping the counsel chamber members of the Town of Parker Colorado on time and in sync is an easy task for DC-Digital and the DC-25T-DN-W timers. They went with RF-wireless controls to keep it simple and flush mount to make them cosmetically appealing. The timers are set up as master … US Army – 216 Calvary, Totally portable PT Digital Outdoor Timer Physical training is at the top of the US Army’s training schedule. To measure this performance the Army looked to DC-Digital and the line of totally portable battery operated outdoor rated timers. The trainees need to meet strict criteria and without knowing that would be well… not good. Do to … B-WAY CORPORATION PURCHASES A DC-DIGITAL DC-256T-UP TIMER B-Way corporation recently purchased DC-Digital DC-256T-UP timer to be a visual reminder to the production worker of the amount of downtime that has taken place on a particular shift. The DC-Digital DC-256T-UP timer has 2.3 inch digits which has a viewing distance of 120 feet. Bway Corporation chose pig tail … BCD Countdown Timer with Foot Switch We put together a foot switch operated timer for Boston Scientific. Not Quite sure what they are using it for but they will be able to set it to any MM:SS value using the supplied rotary 10 Position BCD coded switches mounted in the top of the enclosure for easy … 4.0 Inch LED Digital, Multifunction, Up or Down Timer and Time 4.0 Inch LED Digital, Multifunction, Up or Down Timer and Time of day clock, DC-40UTW Amateur Athletic Union recently bought a DC-40UTW model for their events and practices. This unit is great for many sports activities, events, or meetings. This unit is a universal timer that can count up, countdown, … 4.0 Inch LED Digital, Multifunction, Up or Down Timer and Time of day clock, DC-40UTW-DF 4.0 Inch LED Digital, Multifunction, Up or Down Timer and Time of day clock, DC-40UTW Amateur Athletic Union recently bought a DC-40UTW model for their events and practices. This unit is great for many sports activities, events, or meetings. This unit is a universal timer that can count up, countdown, … Columbus Blue Jackets Timer The Columbus blue Jackets find it easier to let DC-Digital handle the game time and they do the winning! They purchased a DC-40T-DN-W, 4.0 inch high

Pharmaceutical, Cleanroom Sterilization Master-Secondary Countdown Timers DC-Digital has been working with Mechanical Systems Inc. to create a countdown timer that manages how long a door can remain closed for their cleanrooms. This unit is an master-secondary countdown timer specifically designed for pharmaceutical cleanroom environments. Users can easily set the desired countdown time using BCD rotary switches, … Newsroom Timer with Footswitch for Anchor to control Spectrum News and Broadcasting hired DC-Digital to manufacture their news broadcasting timer and add controls for the news anchor to control it. See our complete operation Youtube video. In the fast-paced world of news broadcasting and studio management, precision timing is absolutely critical. To keep the show running seamlessly and … Single Input Timer with ANDON Light for Production Lines We’ve been working with Rotopax in developing a Single Input Timer to manage their production time. Hands free, fully automatic factory process countdown timer with ANDON end of period, overage time indicator LED light. One input action (in this case machine switch closure) resets and starts the timer from the … City Council Meeting Wireless Synchronous Timer Systems w/Large LED Displays City of West Haven, UT, and City of Sedona, AZ, both contracted DC-Digital to help them keep their city council chamber meetings on time. RF-Wirelessly controlled and also RF wireless synchronization, multi-function timers, count up (elapsed time), countdown (time remaining) and time of day clocks (can be shown when timers … Rock Climbing LED Timer Our digital clocks, timers, and counters are often used in a wide array of settings anywhere from school clock systems to surgery timers. One of our recent customers requested that we make them a timer for a rock climbing wall. For the rock climbing wall, we used the DC-406T-UP-TERM. This … Fire Station Turn Out Goal Timer is Network Driven The Honolulu Fire Department wanted a computer controlled Turn Out Timer display with an end of period buzzer and Andon light for additional visual and audible output. This will allow the fire fighters to see how much time has elapsed since receiving the dispatch call for help. Every second counts … Wellness check countdown timer for jails The perfect jail inmate wellness check reminder timer. Once it reaches 00:00 it sounds a 3 second buzzer, resets itself to the last preset time and then starts the countdown time interval to the next cell check again. Systematically eliminating the room for error on being reminded. See video: Jail … Synchronized digital LED countdown timers with footswitch activation Synchronized digital LED countdown timers maintain the countdown time right where you need it (100 locations for wired systems and infinite locations for wireless systems). The countdown time is activated off of a hands free foot-switch which causes the timers to reset to the set value and start. To set … Custom Synchronized LED Digital Timer system Countdown master with count up secondaries. Common start and individual stops. When the master gets to zero the secondaries continue to count up on there own