This circuit uses two ICs, including a 555 timer IC, to create a simple LED chaser. The 555 timer IC is configured as an astable multivibrator to generate pulses that drive a Johnson decade counter IC. The counter IC sequentially lights up the LEDs such that each LED remains on for 1 second before the next one turns on, creating a running light effect. A variable resistor can be adjusted to control the speed of the LED chasing by changing the frequency of the pulses from the 555 timer.
At Softroniics we provide job oriented training for freshers in IT sector. We are Pioneers in all leading technologies like Android, Java, .NET, PHP, Python, Embedded Systems, Matlab, NS2, VLSI etc. We are specializiling in technologies like Big Data, Cloud Computing, Internet Of Things (iOT), Data Mining, Networking, Information Security, Image Processing, Mechanical, Automobile automation and many other. We are providing long term and short term internship also.
We are providing short term in industrial training, internship and inplant training for Btech/Bsc/MCA/MTech students. Attached is the list of Topics for Mechanical, Automobile and Mechatronics areas.
MD MANIKANDAN-9037291113,04954021113
softroniics@gmail.com
www.softroniics.com
PowerPoint Presentation on using IC 555 Timer as an Astable Multi vibrator. Working of the astable multi vibrator, advantages and disadvantages of an Astable Multi-vibrator,Input and Output Pins of 555 IC, Formulae for calculating the charge and discharge time and cycle time of the astable multi vibrator.
Can be used for a project of intruder alarm, mini project for electronics, bulgar alarm as well as for shadow sensing circuit.This is suitable for creating mini project for electronics. Everything is included in the slides.
At Softroniics we provide job oriented training for freshers in IT sector. We are Pioneers in all leading technologies like Android, Java, .NET, PHP, Python, Embedded Systems, Matlab, NS2, VLSI etc. We are specializiling in technologies like Big Data, Cloud Computing, Internet Of Things (iOT), Data Mining, Networking, Information Security, Image Processing, Mechanical, Automobile automation and many other. We are providing long term and short term internship also.
We are providing short term in industrial training, internship and inplant training for Btech/Bsc/MCA/MTech students. Attached is the list of Topics for Mechanical, Automobile and Mechatronics areas.
MD MANIKANDAN-9037291113,04954021113
softroniics@gmail.com
www.softroniics.com
PowerPoint Presentation on using IC 555 Timer as an Astable Multi vibrator. Working of the astable multi vibrator, advantages and disadvantages of an Astable Multi-vibrator,Input and Output Pins of 555 IC, Formulae for calculating the charge and discharge time and cycle time of the astable multi vibrator.
Can be used for a project of intruder alarm, mini project for electronics, bulgar alarm as well as for shadow sensing circuit.This is suitable for creating mini project for electronics. Everything is included in the slides.
A Report on Bidirectional Visitor Counter using IR sensors and Arduino Uno R3Abhishekvb
The aim of our project is to make a controller which can sense if any person enters the room and it lights up the room automatically and also counts how many person are entering the room or going out of it.
This presentation gives an overview of the PIC micro-controllers. Additionally, it describes the advantages, disadvantages and applications of these micro-controllers. It also explains real-world projects that are possible using the PIC micro-controllers.
This was one of my Diploma in Engineering Projects.
It's a Voice controlled Home Automation System which works with the Internet. Which means you can control your home appliances from anywhere.
I did the Presentation for the Home Automation System. I was also one of the core team members who made it happen.
Here are the complete powerpoint slides.
Thank You
Patient Health Monitoring System Using Arduino & ESP8266Rishav Pandey
Sometimes it happens when patients struggles to find hospital beds but due to high number of covid patients they are forced to stay at home and aren't monitored by any doctor. This Health Monitoring System designed with the help of Arduino UNO board and ESP8266 wifi microchip helps the doctor to monitor the patient remotely (connected via an IoT based platform ThingSpeak). ESP8266 wi-fi microchip is used to provide internet connectivity to our project (or we can connect our project to any wifi using same). The system consists of a pulse sensor and and an LM35 temperature sensor which measures the patient's heart beats per minute and body temperature respectively. The Arduino reads the sensor data, converts them into string, passes them to the IoT platform (ThingSpeak) and also displays the BPM and body temperature on LCD display.
In this way a doctor can remotely monitor the patients and take appropriate actions when required.
Automatic solider tracking & health monitoring system ijaranjani
Soldier is always facing death. He never shirks responsibility.
He fights in most difficult terrains, on hills and mountain, in plains and forest.
The defense of the country is his primary mission.
The role of soldier in safeguarding the frontiers of his modest land is unique. He lives and dies for the NATION. It is our responsibility to help our soldier.
Buy best quality LCD Display 16*2 for Arduino Uno at affordable price only at Robomart "Best Store to buy Robotics products"
URL: https://www.robomart.com/16x2-character-lcd-display
A Report on Bidirectional Visitor Counter using IR sensors and Arduino Uno R3Abhishekvb
The aim of our project is to make a controller which can sense if any person enters the room and it lights up the room automatically and also counts how many person are entering the room or going out of it.
This presentation gives an overview of the PIC micro-controllers. Additionally, it describes the advantages, disadvantages and applications of these micro-controllers. It also explains real-world projects that are possible using the PIC micro-controllers.
This was one of my Diploma in Engineering Projects.
It's a Voice controlled Home Automation System which works with the Internet. Which means you can control your home appliances from anywhere.
I did the Presentation for the Home Automation System. I was also one of the core team members who made it happen.
Here are the complete powerpoint slides.
Thank You
Patient Health Monitoring System Using Arduino & ESP8266Rishav Pandey
Sometimes it happens when patients struggles to find hospital beds but due to high number of covid patients they are forced to stay at home and aren't monitored by any doctor. This Health Monitoring System designed with the help of Arduino UNO board and ESP8266 wifi microchip helps the doctor to monitor the patient remotely (connected via an IoT based platform ThingSpeak). ESP8266 wi-fi microchip is used to provide internet connectivity to our project (or we can connect our project to any wifi using same). The system consists of a pulse sensor and and an LM35 temperature sensor which measures the patient's heart beats per minute and body temperature respectively. The Arduino reads the sensor data, converts them into string, passes them to the IoT platform (ThingSpeak) and also displays the BPM and body temperature on LCD display.
In this way a doctor can remotely monitor the patients and take appropriate actions when required.
Automatic solider tracking & health monitoring system ijaranjani
Soldier is always facing death. He never shirks responsibility.
He fights in most difficult terrains, on hills and mountain, in plains and forest.
The defense of the country is his primary mission.
The role of soldier in safeguarding the frontiers of his modest land is unique. He lives and dies for the NATION. It is our responsibility to help our soldier.
Buy best quality LCD Display 16*2 for Arduino Uno at affordable price only at Robomart "Best Store to buy Robotics products"
URL: https://www.robomart.com/16x2-character-lcd-display
SIMULATION OF AN ELECTRONIC DICE CIRCUIT USING LEDs IN PROTEUS SOFTWARE VaishaliVaishali14
The following content consists of the brief details about the topic
INTRODUCTION
CONCEPT OF ASTABLE MULTI VIBRATOR
CONCEPT OF DECADE COUNTER IC4017
CIRCUIT EXPLANATION
CIRCUIT DIAGRAM
VIDEO OF CIRCUIT WORKING
WORKING OF CIRCUIT
INFERENCE
REFERENCE
IC555 Timer, Monostable and Astable modes of operation; voltage regulators - fixed voltage regulators, adjustable voltage regulators - switching regulators.
Automatic fan speed controller withour Microcontroller OR An intelligent Spee...Shahid Shihabudeen
an intelligent speed governor for fan. This works without an microcontroller and not on the basis of temperature instead of that it works with the time. Which means by changing the time the speed of the fan also change
Linear Integrated Circuits and Its Applications Unit-V Special ICsSatheeshCS2
Linear Integrated Circuits and Its Applications
Unit-V Special ICs
Mr. C.S.SATHEESH, M.E.(Control Systems),
Assistant Professor, Department of EEE, Muthayammal Engineering College, (Autonomous) Namakkal (Dt), Rasipuram – 637408
The 555 Timer is an 8-pin Integrated Circuit available
in Dual-in-Line Package originally developed by
Signetics. It is one of the most popular ICs and is
used for a variety of applications like Timer,
Oscillator and Pulse Generation.
Toxic effects of heavy metals : Lead and Arsenicsanjana502982
Heavy metals are naturally occuring metallic chemical elements that have relatively high density, and are toxic at even low concentrations. All toxic metals are termed as heavy metals irrespective of their atomic mass and density, eg. arsenic, lead, mercury, cadmium, thallium, chromium, etc.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
1. LED CHASER
This is the circuit of a simple LED chaser. The LEDs lights one by one for a period
of 1second and the cycle repeats giving the running light appearance. The circuit
uses two ICs (one is 555) to drive the LEDs. IC1 (NE555) is the popular timer IC
wired in the Astable Multivibrator mode. Resistors R1, VR1 and capacitor C1 act
as the timing components and the output pulses are available from the output pin 3
of IC1. These pulses are given to the input pin 14 of the Johnson decade counter IC
CD4017. Out of the 10 outputs of IC2, eight outputs are used to drive the LEDs.
The ninth output pin 9 is connected to the reset pin 15 to stop the counting. So that
the cycle repeats. With the value of C1, each LED remains on for 1second. When
one LED turns off, the second on turns on. This cycle repeats giving the running
light appearance. Resistor R3 keeps the input pin 14 of IC2 low after each
pulse.VR1 adjusts the speed of LED chasing.
LED Chaser Circuit
The popular Timer IC 555 is extensively used in short duration timing applications. IC 555 is a
highly stable integrated circuit functioning as an accurate time delay generator and free running
multivibrator. But one of the serious problem in 555 timer design is the false triggering of the circuit
at power on or when voltage changes. The article describes how IC555 is designed perfectly to avoid
false triggering.
2. 555 IC pin functions
Pin1 Ground Pin2 Trigger Pin3 Output
Pin 4 Reset Pin 5 Control voltage Pin 6 Threshold Pin 7 Discharge Pin 8 Vcc
Functional aspects of pins
Trigger Pin 2
Usually pin2 of the IC is held high by a pull up resistor connected to Vcc. When a negative going
pulse is applied to pin 2, the potential at pin 2 falls below 1/3 Vcc and the flip-flop switches on. This
starts the timing cycle using the resistor and capacitor connected to pins 6 and 7.
Reset pin 4
Reset pin 4 can be controlled to reset the timing cycle. If pin 4 is grounded, IC will not be triggered.
When pin4 becomes positive, IC becomes ready to start the timing cycle. Reset voltage is typically
0.7 volts and reset current 0.1 mA. In timer applications, reset pin should be connected to Vcc to get
more than 0.7 volts.
Control Voltage pin 5
Pin5 can be used to control the working of IC by providing a DC voltage at pin5. This permits the
control of the timing cycle manually or electronically. In monostable operation, the control pin5 is
connected to ground through a 0.01 uF capacitor. This prevents the timing interval from being
affected by AC or RF interference. In the Astable mode, by applying a variable DC voltage at pin 5
can change the output pulses to FM or PWM.
Threshold pin 6 and Discharge pin 7
These two inputs are used to connect the timing components- Resistor and Capacitor. The threshold
comparator inside the IC is referenced at 2/3 Vcc and the trigger comparator is referenced at 1/3 Vcc.
These two comparators control the internal Flip-Flop of the circuit to give High or Low output at pin
3.When a negative going pulse is applied to pin 2, the potential at pin2 drops below 1/3 Vcc and the
trigger comparator switches on the Flip-Flop. This turns the output high. The timing comparator then
charges through the timing resistor and the voltage in the timing capacitor increases to 2/3 Vcc.( The
time delay depends on the value of the resistor and capacitor. That is, higher values, higher
time).When the voltage level in the capacitor increases above 2/3 Vcc, the threshold comparator
resets the Flip-Flop and the output turns low. Capacitor then discharges through pin 7.Once triggered,
the IC will not responds to further triggering until the timing cycle is completed.
3. The time delay period is calculated using the formula T= 1.1 Ct Rt. Where Ct is the value of
Capacitor in PF and Rt is the value of Resistor in Ohms. Time is in Seconds.
How to eliminate false triggering?
The circuit diagram shown below is the simple monostable using IC 555. To
eliminate the false triggering resistor R1 and Capacitor C1 are connected to the
reset pin 4 of the IC. So the reset pin is always high even if the supply voltage
changes. Moreover capacitor C3 connected close to the Vcc pin 8 acts as a buffer
to maintain stable supply voltage to pin 8. Using this design, it is easy to avoid
false triggering to a certain extent.
555 Monostable circuit
A ready recknor to select timing resistor and capacitor
Theoretically long interval is possible with IC 555,but in practical conditions, it is difficult to get
more than 3 minutes. If low leakage Tantalum capacitor is used, this can be increased to 5 minutes or
more. If the value of the timing capacitor is too high above 470 uF, charging time will be prolonged
which will upset the timing cycle and the output remains high even afterthe desired time is over.
4. The internet is overfilling with LED chasers, Knight Riders, and different ways to blink a series of
LEDs in a certain pattern. In this article, I'm going to make yet another LED chaser, or a Knight
Rider, but this one is with a little twist: we'll make an LCD with a menu that will allow you to choose
different patterns and speeds.
This project has five PCBs: four PCBs with LEDs and one with a microcontroller. On the LED's
PCB, there are two ICs: the HCF4017BE Johnson counter. The counter has one clock input pin and
10 output pins. For each high pulse received on the clock pin, the next output pin is set high, starting
with output pin 0. Read more about the IC in the link.
The last PCB has a PIC16F877A microcontroller. To this microcontroller I've connected a few
switches, a potentiometer, and an LCD. The microcontroller clock on each counter IC is in a different
order. The microcontroller can also reset the counter ICs. In the software, there's a menu that allows
you to choose between some predefined patterns. You navigate with one of the switches and enter the
menu choice with another. The third switch is the reset switch. One of the patterns lets you use the
potentiometer to change the speed for the "running" LEDs. This is done with the microcontroller's
built-in ADC module. ADC will not be discussed in this article.
When we power the circuit, LEDs start glowing one by one for a defined time period. Means first
LED Q1 glows and then Q2 glows and Q1 turned OFF and then Q3 glows and Q2 turned OFF and so
on. When we change resistance of variable resistor then speed of LED’s increase. Because frequency
of 555 timer increases and this increases frequency signal is directly connected to counter’s trigger
pin. So that counter changes its state faster.
555 timer frequency formula:
The charge time (output HIGH) is given by :
T1 = 0.693 (R1 +VR) C1
The discharge time (output LOW) by :
T2 = 0.693 (R2) C1
Thus the total period T is given by :
T = T1 + T2 = 0.693 (R1 + 2VR) C1
The frequency of oscillation is:
F= 1/T
F=1.44/(R1+2VR)C1
The main part of this LED chaser circuit diagram is 555 timer IC which generates some variable
frequency. 555 timer IC is a general purpose IC which can be configured in some different modes
like Astable, Monostable and Bistable. Here in this project we configured 555 timer as an Astable
multivibrator in which both the stages of signal are unstable. Some
5. time we call frequency generator also. Here we use output signal of this Astable multivibrator to
trigger IC CD 4017 counter to change its state to perform desired task.
Here we have connected 555 timer IC in Astable mode for generating a trigger pulse of some time
period. A variable resistor is connected for changing the cycle frequency of 555 timer’s output. A
CD4017 counter IC is also connected with this circuit for lighting LEDs. 10 red LED’s are connected
to Q0-Q9 pin (pin 3) through 150 ohm resistor. MR pin (pin 15), enable or clock inhbit pin (pin 13)
is directly connected with ground and Clock pin of counter directly connected with output pin of 555
Timer.
Conclusion
In this article I've made yet another LED chaser for the internet, but the little twist here is the LCD
with a menu. A total of 32 LEDs are running up and down, or in different patterns. The
microcontroller has some unused pins, which means that you can add even more PCBs with LEDs.