The circuit presented here operates a relay for Fixed Timer Interval. So the device or machine connected with relay operates for same time. The device once switched ON, automatically switches OFF after Fixed (set) Time Interval when relay switches OFF. The Time Interval can be varied and it is displayed on 7 Segment Display. This kind of circuits can be used in many applications where it is required to operate any device or machine for Fixed Time Interval.

RPM counters are used to measure Speed of Motors (AC/DC) or any Rotating Object. They measures and indicates current Rotating Speed of Motor. They are very essential in applications like Speed Control of Motors and close Loop Control System. Such industrial RPM counters are very accurate made up of microcontroller or microprocessor. 

The coin toss circuit is an interesting electronic project which can be used to conduct a toss between two teams or individuals. It is a decision maker used at the places where someone is not able to make up the decision. When a button is pressed, the head and tail h and t respectively display on 7 segment display.  An important feature of this circuit is using a single IC that is CD4049 and displays the h and t on seven segment displays in spite of LED so decision is clearly indicated. 

Seven segment displays are very commonly used in meter displays, etc. In this tutorial we’ll interface seven segment display(s) to our ARM7 based microcontroller LPC2138. For those who are new to ARM refer to previous tutorial (LED Interfacing). The task is to display all Numbers (0-9) and Alphabets on SSD. LPC2138 is a 32-bit microcontroller, so while coding we’ll be dealing with IO Registers that are 32-bit wide. For Interfacing a 7-segment we choose P0 (P0.0 to P0.7; 8 Pins out of 32 IO Pins on Port-0).Let’s use a common anode type display, a simple push-button switch, Resistors, etc. a,b,c,d,e,f  terminals of display are connected to P0.0 to P0.6 respectively. Common terminal is supplied with +Vcc through a current limiting resistor R. Keep on reading to find out how whole system is assembled and what coding is applied to make it work.  

CD4026 is a Johnson counter IC commonly used in digital display. It has a 5 stage Johnson decade counter with a decoder which converts the Johnson code to a 7 segment decoded output. To put it simply, it will convert the input into numeric display and can be seen on 7 segment display or with LED. It can be used for displaying analogue value such as temperature with pic microcontroller or for counting objects.There is various other applications like in 7 segment decimal display circuit, in clocks, timer etc. Advantages of 4026 counter are : It contains counters and 7 segment decoded in one package, It can be easily interfaced with 7 segment types, Ideal for low power display, Operated at wide range of temperature from 5V to 20V and the biggest advantage of the 4026B counter IC is that it can drive a 7-segment display without needing a decoder driver IC.

The main aim of this project is to understand that how Seven Segment Interfacing is done using Arduino. The project idea is to make an application based on Seven Segment Display. Here we demonstrate Seven Segment Interfacing and its application in a single project. Applications are Seven Segment Counter and Ultrasonic Sensor & Seven Segment based Distance Measurement project. 

The circuit presented here operates a relay for Fixed Timer Interval. So the device or machine connected with relay operates for same time. The device once switched ON, automatically switches OFF after Fixed (set) Time Interval when relay switches OFF. The Time Interval can be varied and it is displayed on 7 Segment Display. This kind of circuits can be used in many applications where it is required to operate any device or machine for Fixed Time Interval. Like·         The Alarm Signal (or Bell) once triggered, remains ON for Fixed Time Interval and then shuts off automatically·         In Manufacturing Industries the Motors have to be rotated for Fixed Time Interval once start button is pressed. It stops automatically when time period is overTime operated relay circuit is build using IC555. To display the time period in seconds 2-digit decade counter is build using CD4026 chip. Another IC555 is used to provide 1 Hz pulse to update time period after every 1 sec.

The circuit presented here operates a relay for Fixed Timer Interval. So the device or machine connected with relay operates for same time. The device once switched ON, automatically switches OFF after Fixed (set) Time Interval when relay switches OFF. The Time Interval can be varied and it is displayed on 7 Segment Display. This kind of circuits can be used in many applications where it is required to operate any device or machine for Fixed Time Interval. Like·         The Alarm Signal (or Bell) once triggered, remains ON for Fixed Time Interval and then shuts off automatically·         In Manufacturing Industries the Motors have to be rotated for Fixed Time Interval once start button is pressed. It stops automatically when time period is overTime operated relay circuit is build using IC555. To display the time period in seconds 2-digit decade counter is build using CD4026 chip. Another IC555 is used to provide 1 Hz pulse to update time period after every 1 sec.