If you like this project, please consider voting for it in the PCB Contest at the bottom of the page! Stargate SG-1 is my favorite TV show of all time—full stop. Over the past couple of months, I've been forcing my girlfriend to watch to watch the entire series. We were around season 4 when I saw that Instructables was running a PCB Contest, and it seemed like the perfect opportunity to design my very own Stargate that I could put on my desk.
This project is what I came up with. Tap the capacitive touch pad on the DHD and each chevron will light up in sequence. Get to the 7th chevron, and the wormhole lights up!
The PCB is designed as a single piece, and snaps apart. Read on to see how I designed it, and for instructions on how to assemble it! If at all possible, you want to prototype your PCB designs on a breadboard before actually getting anything fabricated. These days, it's very affordable to have PCBs made, but you still don't want to waste your time or money.
In my case, I had never worked with a shift register before, so that was what I needed to concentrate on testing. I actually made the mistake of ordering PCBs before thoroughly testing. Those didn't end up working well for a few reasons, and I wasted a lot of time and money. The new design is more simple and less expensive. To prototype my shift register design for the second revision of the PCBs, I put everything out on a breadboard.
There is also a second area for programming the ATtiny85 through an Arduino Google how to do that, there are a lot of tutorials. Attached is the ATtiny85 code flashed using an Arduino. After testing, I moved onto the PCB design. It contains the Gerber files to get these fabricated. The physical design of the PCB was very important to the final product—particularly since it snaps apart and parts of the PCB are used as supports.
For that reason, I started in CAD. All you have to do in Fusion is create a new sketch on the surface of the part, and project all the edges.Digital wall Clocks are getting more popular now days and they are better than analog clock as it provides accurate time in hours, minutes and seconds and its easy to read the values.
Some digital clocks also have many facilities like displaying temperature, humidity, setting multiple alarms etc. Most of the digital clocks use seven segment display. We previously built many digital clocks circuits either using 7 segment displays or using 16x2 LCD. They are used to display numerical values and also some alphabets with decimals and colon. The display can be used in both direction. Four digits are useful for making digital clocks or like counting numbers from 0 to Below is the internal diagram for 4-Digit 7 Segment display.
There are two types of seven segment displays such as Common Anode and Common Cathode. The above image shows the common anode type 7 segment display.
Using Shift Registers with AVR Micro – AVR Tutorial
And all the negative terminals are left alone or connected to the microcontroller pins. And all the positive terminals are left alone or connected to the microcontroller pins. Learn more about 7 segment displays here and check how it can be interfaced with other microcontrollers:. This IC can receive data input in serial and can control 8 output pins in parallel. This is useful in reducing pins used from microcontroller. You can find all the 74HC shift register related projects here. The clock is used to provide continuously pulses from microcontroller and data pin is used to send the data like which output needs to be turned ON or OFF at the respective clock time.
DS is an RTC module. This module is used to remember the time and date even when the circuit is not powered.
It has a battery backup CR to run the module in absence of external power. This module also includes a temperature sensor. The module can be used in embedded projects such as making digital clock with temperature indicator etc. Here are some useful projects using it:. The complete code and working video are attached at the end of this tutorial.
In the programming section, how the time hour and minute is taken from the RTC module in 24hr format and then it is converted into respective format for displaying them in the 4-digit 7 Segment display will be explained. In this concept, hour and minute are taken first from RTC and they are combined together like pm and then the individual digits are separated like thousand, hundred, tens, unit and the individual digits converted into binary format like 0 into 63 This binary code is sent to a shift register and then from the shift register to the seven-segment, successfully displaying the Digit 0 in seven segment display.
This way, the four digits are multiplexed and hour and minute is displayed. The pins are defined for the seven segment control.
48 x 8 Scrolling LED Matrix using Arduino.
These controls will play important role in multiplexing the display. The variables are declared to store the converted or raw result taken from the RTC.
So, wire. The pin mode are definedwhether the GPIO will behave as output or input. The individual digits from number are obtained example 1 is thousand,0 is hundered,1 is tenth and 0 is last digit.
To separate the digits, modulus operator is used. So separate digits are stored in separate variables. After that a switch case statement for each individual digit is defined for converting them into respective format binary format and sending out via shift register to display in 7-segment.
For example For 1 digit it is changed into 06 This finishes the complete code. Most of the function explanation are given in the code comment section just beside the code line.Here is the schema of the setup power sources not shown : Schema. Toggle navigation Home.
The driving chip on the motor shield is designed to provide as high as mA and 1. Motor Shield Arduino Board Module. Double-layer or double-sided PCBs have a base material with a thin layer of conductive metal, like copper, applied to both sides of the board.
Your motor is Bi-polar. It has two windings and you need to use a circuit that constantly inverts the polarity of the supply to the coils. This is done with an H-bridge that operates as four switches. You need one H-bridge per coil, so you'll need two of them to control your stepper. Even if your stepping motor has 6 wires, you can still control it like a four wire stepper motor, you just need to identify the center tap wires. You can do that following the same tutorial on stepper motor wiring mentioned above.
We have upgraded the shield kit to make the bestest, easiest way to drive DC and Stepper motors. See the unipolar and bipolar motor schematics for information on how to wire up your motor.
In this example, a potentiometer or other sensor on analog input 0 is used to control the rotational speed of a stepper motor using the Arduino Stepper Library.
Raspberry Pi - Revision 2 DIY Add-On Board
LD is a dual H-bridge motor driver integrated circuit IC. Motor drivers act as current amplifiers since they take a low-current control signal and provide a higher-current signal. This higher current signal is used to drive the motors. Stepper Library This library allows you to control unipolar or bipolar stepper motors. To use it you will need a stepper motor, and the appropriate hardware to control it. What is the wiring of arduino motor shield to Nano?
Circuit Diagram.Add the following snippet to your HTML:. Read up about this project on. This was my first project with an Arduino development board. It was a challenge given to me by my teacher to try to build one. So at that time of accepting this challenge, i didn't even knew how to blink an LED using an arduino. So, i think even a beginner can do this with a little bit of patience and understanding. I found the circuit diagram online and that was my only reference to build this project.
I started off with a little research about shift registers and multiplexing in arduino. I gathered all the components from different sources.
I got this 5mm 8x8 common cathode LED matrix display from an online website. It's shown in the circuit that a single shift register is used to control the 8 rows and for controlling the columns, we use one shift register for each 8 columns.
So if you are able to make a simple 8x8 matrix, you can simply just replicate the portion of the circuit for the column control and extend the matrix to any number of columns. You just need to add one 74hc for every 8 columns one 8x8 module you add in to the circuit.
Keeping that in mind, i made my 8x8 prototype. I took seperate dot boards to make the row and column controls and extended wires and headers to connect them together. Once you've successfully made a 8x8 matrix you just need to daisy-chain more shift registers with common clock to drive the columns.
So based on the number of columns, more shift registers can be added, there is no limit for the number of columns you can add. As i didn't had access to 3D printing at that time, i approached a local carpenter to make a case. The case he made was much larger than i expected, it's better to design a smaller case using Fusion or any other design software and 3D print the case.
Holes were made in the case to connect the power and usb cables. Here we will be scanning across the rows and feed the column lines with appropriate logic levels.Table of Contents. While getting started with electronics, you must be thinking about making useful and simple circuits that you can get embarked one and costs you less.
Using cost-effective electronic components, circuit diagram, pin diagram, this article will guide you step by step to make a flash lamp using Timer IC. Before starting with the designing process, let me give you some brief idea about the flash lamp and the timer IC used in the circuit. A portable source of light is which incandescent light source light bulb or light emitting diode LED is used. In this project, we are using LED light emitting diode due to its energy efficient and long lasting features as a source of light.
Collect all the required components and get ready to put all the components together!LED Rain Drop Effect chaser using 74HC595 shift register and NE555 timer IC.
Step Put the timer IC on breadboard. Step Connect pin 1 of Timer IC to the ground as shown below.
You can see the pin structure of Timer IC in the pin diagram shown above. Step Connect the positive end of the capacitor with pin 2 of Timer IC. Longer lead of a polarized capacitor is the positive and the shorter one is negative end. Step Join the negative lead of the capacitor with the ground of battery. Step Connect pin 6 of timer IC with pin 2.
Step Connect the negative lead of LED with ground. Step Connect pin 4 with the positive end of the battery. Step Connect pin 8 with the positive end of the battery. Step To start the power supply in circuit, connect the battery leads with breadboard. Once you connect the battery to circuit, the LED should flash. Make sure the battery is connected to breadboard and power is reaching to components of circuit.
Here, the circuit consists of an A-stable multi vibrator using Timer IC which creates a square wave. The circuit has an on-state time of 0. To Rate of flashing lamp can be calculated as. Due to the internal circuitry of Timer IC, the output keeps switching between sinking to sourcing. Bottom Line. In this article we have tried to provide you the simplest and effective way to design a flash lamp using Timer IC along with the basic knowledge of Timer and its internal circuitry with the help of block diagram ,Wave form and pin diagram.
Hope, you will be able to successfully design a flash Lamp using timer IC with our step by step process in this article. Your email address will not be published. Show More. Related Articles. Emergency LED Lights. One Comment.The 74HC is useful if you find yourself needing more outputs than you have available on your microcontroller; Its time to think about using a serial shift register such as this chip.
Using a few of your existing microcontroller outputs you can add multiple 's to extend outputs in multiples of 8; 8 outputs per When you add more s you don't use up any more of your existing microcontroller output pins.
The way it works is that you use one microcontroller pin as a data output and another as the clock. Simply toggle the clock pin low to high to clock in the value at the data input of the Since the has 8 outputs you do this 8 times to fill the memory.
To transfer the new stored data to the outputs toggle another pin and you're done - 8 new outputs working. You can also string together multiple 's for even more outputs! There are several examples here that show you how to do it.
This 74HC tutorial shows you examples of driving 7 segments, LEDs, and using multiple 's for 8, 16 or 32 outputs all using just a 3 wire interface. You can also find out the correct way of using these devices to drive LEDs and seven segment displays and learn how to add 8, 16, 32, or more, outputs with multiple 's.
Its simply a memory device that sequentially stores each bit of data passed to it. You send it data by presenting a data bit at the data input and supplying a clock signal to the clock input. At each clock signal the data is passed along a chain of d-types - the output of each d-type feeds into the input of the next. When you have clocked in 8 bits of data you can then activate the parallel 8 bit output from the d-type stores.
The uses the standard SPI interface. The three serial control signals from the microcontroller are:. With only these 3 serial controls you can add as many outputs as you need - the number of serial control wires always remains the same.
The output enable is not really useful for modern designs just connect it to ground see here for what it should really used for. You can wire the Master Reset MR control inactive unless it is vital that the outputs are reset to zero on power up. Leaving it active means a software reset is required at the start to send zeros to the shift register and then strobe them to the output using the latch clock.
The allows you to transmit data in a serial stream using a few wires with the outputs at the destination delivered in parallel.Pages:  2 3. SpikedCola Guest. Interfacing Arduino with 74HC and a 7-Seg. Some of you may recognize me from the thread about interfacing an HD display and DS18S20 temperature sensors. It was a great learning experience! Thanks to everyone that helped me get it working For my next project, Ive picked up some CC 7-seg displays and some 74HC shift registers.
Id like to do the same thing read the temperature and display it to the 7-seg's I started with the LCD because saying lcd. I have Q0 connected to the 'a' segment I dont know if I labelled properly, but I started with 'a' being the top segment, and 'b' being the top-right segment, and continuing on in a clockwise rotation all the way up to 'g' connected to Q7. Im using the following code from the shiftOut tutorial, modified a bit explained later : Code: [Select].
Code: [Select]. Hey again! It looks like you are still having a good time! You can get away with just one shift register if you want to multiplex the display.
That should give you plenty to think about for a while. Thanks for the reply. After school, Ill start working on having it flash the displays, one by one. And since Id like to have two, that puts me up to 14 wires, which doesnt leave much room for anything else. Any ways of further reducing the amount of pins Ill need to use? Use a demultiplex chip like the 74LS42, this will give you 8 output wires for only 3 address lines. Use these to switch the power on the anodes while pulling down the cathodes with the shift register.
That looks backwards to me, Mike. Are you sure about that? I was thinking the same thing. I chose common-cathode displays so I could turn them on with a 1. What you describe sounds like i would need to enable the displays with something like instead of which would make things more difficult for me.
Good, there's been some discussion while I was gone While I was in class I drew up some stuff. Idea 1: Connecting the displays with only shift registers for a total of 3 wires per group of displays : Idea 2: Connecting the displays with a shift register and either a 2-to-4 line decoder for multiplexing the displays which would need five wires, or using a transistor missing resistors - just a block diagram for each display, for a total of seven wires per group of displays: Now, some of these ideas may not even work, I was just trying to come up with ideas, to prove that Im serious about doing this and not just trying to con you guys into doing my work for me!
Those are all good ideas. Did you say the two displays on the right were displaying constant degree symbol and the "C"? In that case you could hard wire the characters although you'd have to fiddle with resistance to get the same brightness as your live digits.
Probably a little too much "refining" as you might want to use those digits in the future. Think about the code for the case where you have only one shift register.
Introduction to 74HC595
What do you have to do to maintain a reading in your live displays before the next refresh? Think about the case where you have a shift register for each live digit.
Ask yourself the same question. What about if you have a chip that turns decodes BCD into 7 segment ? Does that give you more or less time for other processing than the other two cases? Which strategy of multiplexing gives you least time to do other things?