The electronic design community and online store built for engineers and hobbyists alike, join now and browse the store at element14.com. Benjamin J heckendorf was a mild mannered graphic artist into his bitten by the electronics bug Music. Now, every week he takes on new projects, shares tips and tricks and answers. Your viewer questions on the Ben Heck show hello and welcome back to the Ben Heck, show in today’s episode I’m going to show you everything you need to know and start using Arduino microcontrollers in your projects, but first the news today in Ben news I’d, like to Tell you my new year’s resolution and it is to finish a pinball machine. I actually haven’t finished one since March 2010, when I did Bill Paxton pinball, so it’s been almost three years, so my resolution I’m going to get go squat done in time for the March Midwest gaming classic period. The name Arduino describes a microcontroller development system. Let’S go over the parts of the most common model, the Arduino Uno. This device can be powered by the USB port or the DC power jack. The USB port also does a serial programming and communication from your computer. Arduino is based off Atmel AVR microcontrollers, the uno. Actually contains two microcontrollers, the smaller one on the left performs a USB to serial conversion. Other devices often use an FTDI chip for this function on the right is the heart of the Arduino, an 18 mega 328 microcontroller.
This is the through hole version. Some versions have surface mount the pins of this chip. I brought out to the headers allowing you to connect whatever you want. This is the Arduino integrated development, environment or IDE. For short, this program is not actually installed. Instead, you just download the Arduino folder put it wherever you want and run it from there. If you get a new piece of hardware like a motion sensor and want to include its libraries to help your code, just put them in the libraries folder, this IDE plus a physical board, makes off the Arduino system. A breadboard with jumper leads is also very useful. When prototyping now let’s discuss some basic things, you can do with an Arduino. We will cover outputs such as an LED inputs such as a switch PWM or pulse width, modulation and analog input such as a gaming joystick let’s start with outputs click on files. Example blink to load up a basic sketch. We will use this for all of our examples. The blink example says: pin mode 13 output pin load 13 is the built in LED on the Arduino board. Let’S change this to pin mode 7. 1 1 means the same thing as output for most functions. You need to declare what you want the pin to do before you can do it now in loop change both of the 13s to 7 change high to 1 and low to 0 digital write changes, the pin state, but remember you – must declare the pins mode first.
On the Arduino connect a positive, long lead of an LED to pin 7, the other lead of the led to a resistor under 1k. Ohm is fast and the other end of that to ground on the IDE go to tools, serial port and the Arduino will usually be the highest or most recent port listed select. It then click the forward arrow or push ctrl you to upload. The light is now blinking you’ve taken your first step now, let’s do an input in this case a button under setup, add pin mode 6, 0 of making pin 6 and input. You could also type input instead of 0. Before we continue let’s add the switch begin to switch a constant known state. We connect it to positive voltage through a 10k resistor and then connect this to our pin 6 input. This is called a pull up resistor. Thus, when the switch isn’t being pressed will read a 1 positive voltage, the other side of the switch we connect to ground, meaning that when you press it will read a 0. This could also be reversed by having the resistor and the default state go to ground and the button pressed state B 1 that would be called a pulldown, resistor guess what’s, just as cool as the mod we’re making. Now the new builds you can make using the new 512 megabyte Raspberry Pi that’s, twice the memory of the first model, but at the same great price and what goes well with the Raspberry Pi I’d like to order two guys for a PI’s.
Please, oh you have the 512 megabyte flavor. Give me that, yes also, I would like one Samsung Galaxy Tab. 2. 7 inch tablets win one today for showing element14 what you can do with your new and improved high compete in the element14 communities. Double the memory pie challenge it’s a cool blogging competition for everyone who loves a slice of raspberry pie joining the challenge is easy. Just go to element14.com. Pi challenge show them what you can do with twice the memory. In a 300 word or more blog, the element14 community team will choose the top 5 projects and the creator of the winning project will win the Samsung Galaxy Tab. 2. 7 inch tablet, the remaining 4 projects will be showcased on the community with full bragging rights. The double the memory pie challenge is just another way that OMA 14 makes it easy for engineers to be inspired to find the solutions and products they need to get the job done. Good luck with the contest and happy building and now back to the show back to the program on your loop let’s, add if digital read 6 hour switch pin number equals 0, meaning it’s pressed then digital write, 7 1 turn on the LED else. That is, if it doesn’t equal, 0 digital write, 7, 0. Turning off the LED, we can also delete the delay, functions, control you to upload the sketch and voila. You are now controlling the LED via logic.
Now let’s do PWM pulse width, modulation, things like a dimming LED or a variable speed motor aren’t controlled by changing the voltage, but rather the frequency – and this is done with PWM in our sketch – will change pin 7 to 5. This is because only certain pins on the Arduino, our PWM, capable indicated by the swirly lines on the PCB so we’re, going to use number 5 and leave our switch on number 6 in our. If statement will change it. So if the button is pressed, you do an analog write of 255 to pin 5. This is full speech. This arrange is 0 to 255, an 8 bit value for the else. That is no button. We’Ll make it an analogue right, 564 14 of the speed, but still on upload this to the Arduino then move the LED to pin 5. Its default will be dim because of the PWM of 64 press. The button, and it will receive faster pulses, thus be brighter. Remember, it’s actually flickering very rapidly just faster than your eye, or this camera can see now. Let’S try a motor, the pins can’t power, one directly, so we’ll hook pin 5 up to a transistor which will act as a switch for our higher current motor. In this case, the lower speed of 64 causes the motor to move slowly while pressing the button and giving it 255 is full speed. Our final example of the analog in the uno has 6 channels for this, which can be used for normal IO as well.
In our code, we’re going to add serial begin and the baud rate to set up this allows our program to monitor the progress next above setup, we add an integer variable, called pot capital V and set it to 0. Capitalization does matter so keep track of it. In loop we add pot V, equals analog, read a 0, the first analog, visible converter. This is a 10 bit. Adc Heaney will get a value from 0 to 1023. Next, we add serial print line pot V, which will send the result back to our PC upload. The sketch to the uno and then click here to open the serial, monitor, make sure you set the baud rate to match your program. Let’S attach one axis of an analog. Stick to the blue note. The center of the potentiometer called the wiper goes to the a0 connection, we’re monitoring the other 2 pins go to ground and positive voltage by moving the stick back and forth we’re moving the wiper closer to either ground or positive voltage. This makes the value of pot. He either closer to zero or closer to 1023, depending on whether it’s close to the ground or positive voltage, sensor or not, press will be around 2.5 volts or 511. In this tutorial, we covered the basic things you can do with an Arduino you’ve seen me used in the puppets before, because they’re cheap, easy to use and quite powerful. Now that you have the skills let’s see what you come up with.
My rave today is about great new problem solving ideas. I love getting suggestions via email and show comments with things I would have never thought of before, such as my single handed controller mod, no person should work in a vacuum, so it’s always great when I get outside input. However, my rant today involves projects and aren’t, really worth my time like trying to revive a laptop LCD when you could just buy a new one for 50 bucks. Another example is that double decker printer I built a few episodes ago – it’s, cool and all, but the time it took me to build it probably exceeded the time that would save me, my printing to objects at once. So it’s important that when you start the project you think about is the time it takes to build it going to be worth the value of it when it’s done it’s, not always going to be worth it. Today’S question comes from the extremely hot and cold fans who asks I’m looking for a variable resistor, but I needed to be able to handle these 10 amps at 12 volts DC. I want to control a Peltier plate and adjust how hot or cold it is. I would suggest looking into the temperature control circuit of a 3d printer it’s, widely available, they use something called a MOSFET, along with a temperature probe to control high voltage heaters. Basically, it’s switched on and off very rapidly to maintain the temperature.
The same method will work with your Peltier cooler that’s, all the time we have for today in our next episode, we’re going to be modding a MIDI controller into a guitar we’ll, see you then stay tuned at element14.com tph s where you can join the discussion to Just build for the show and even have a chance to win upcoming bills. Remember you can always email built ideas to bend at element14.
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🔬 Now that you’ve gotten your feet wet, dive into the kit and enjoy all nine experiments. Order yours today: http://bit.ly/2MnQ7fr
Originally posted 2015-12-18 21:37:09.