Posts with «diy» label

Laser projector ditches galvanometer for spinning drum

Laser projectors like those popular in clubs or laser shows often use mirror galvanometers to reflect the laser and draw in 2D. Without galvos, and on a tight budget, [Vitaliy Mosesov] decided that instead of downgrading the quality, he would seek an entirely different solution: a spinning mirror drum.

He fires a laser at a rotating drum with twelve mirror faces, each at a different adjustable vertical angle. The laser will hit a higher or lower point on the projection surface depending on which mirror it’s reflecting off – this creates resolution in the Y direction.

Timing the pulsing of the laser so that it reflects off the mirror at a certain horizontal angle provides the X resolution.

As you can already tell, speed and timing is critical for this to work. So much so that [Vitaliy] decided he wanted to overclock his Arduino – from 16 MHz to 24.576 MHz. Since this changes the baud rate, an AVR ISP II was used for programming after the modification, and the ‘duino’s hardware serial initialization had to be hacked too.

For the laser itself, [Vitaliy] designed some nifty driver circuitry, which can respond quickly to the required >50 kHz modulation, supply high current, and filter out voltage transients on the power supply (semiconductor lasers have no protection from current spikes).

On the motor side of things, closed loop control is essential. A photo-interrupter was added to the drum for exact speed detection, as well as a differentiator to clean up the signal. Oh, and did we mention the motor is from a floppy disk drive?

We’ve actually seen builds like this before, including a dot-matrix version with multiple lasers and one made apparently out of Meccano and hot-glue that can project a Jolly Wrencher. But this build, with its multiple, adjustable mirrors, is a beauty.  Check it out in action below.

Hack a Day 20 Apr 16:30

Arduino and processing based GUI person counter

In this post, we will make arduino and processing based GUI person counter. For person counter, we are using infrared sensor (IR). It's output is digital and is fed to pin number 7 of arduino.

The connections are as follows:


Arduino Code:

int switchPin=7;
int ledPin=13;

void setup() {
pinMode(switchPin,INPUT);
digitalWrite(switchPin,HIGH);
pinMode(ledPin,OUTPUT);
Serial.begin(9600);
}

void loop() {
  if(digitalRead(switchPin))
    {
    while(digitalRead(switchPin));        
    Serial.print(1,DEC);
    }
  else
    {
    Serial.print(0,DEC);
    }
    delay(100);
} 

Processing Code:

import processing.serial.*;

Serial port;
int val;
int count=0;
PFont f;                           // STEP 1 Declare PFont variable

void setup()  {
    size(400,400);
    noStroke();
    println(Serial.list());  // print list of available serial port 
    port=new Serial(this,Serial.list()[0],9600);        
    f = createFont("Arial",16,true); // STEP 2 Create Font
 }
  
void draw()  {
  if(0<port.available())
  {
    val=port.read();
  } 
    background(204);
    println(val);

  if(val==48)
{     fill(255,0,0);   // red
  rect(50,50,300,300);  // green
}
  else if(val==49)
{     fill(0,255,0);   // green
  rect(50,50,300,300);  // green
  count++;
}

  textFont(f,30);               
  fill(0);                         
  text("Number of Person is: " + count , 30, 30);
//text(count, 100, 100);
delay(100);

 }

/* END OF CODE */

Man-in-the-Middle Jog Pendant: Two Parts Make Easier Dev Work

In a project, repetitive tasks that break the flow of development work are incredibly tiresome and even simple automation can make a world of difference. [Simon Merrett] ran into exactly this while testing different stepper motors in a strain-wave gear project. The system that drives the motor accepts G-Code, but he got fed up with the overhead needed just to make a stepper rotate for a bit on demand. His solution? A grbl man-in-the-middle jog pendant that consists of not much more than a rotary encoder and an Arduino Nano. The unit dutifully passes through any commands received from a host controller, but if the encoder knob is turned it sends custom G-Code allowing [Simon] to dial in a bit acceleration-controlled motor rotation on demand. A brief demo video is below, which gives an idea of how much easier it is to focus on the nuts-and-bolts end of hardware when some simple motor movement is just a knob twist away.

[Simon]’s jog pendant moves a single motor which is exactly what he needs to ease development of his 3D printed strain-wave gear using a timing belt, but it could be programmed with any G-Code at all. Speaking of DIY jog pendants for CNC machines, don’t forget this wireless one made from an Atari 2600 joystick that jogs a plasma cutter in X and Y, and zeroes it with a push of the button.


Filed under: Arduino Hacks, cnc hacks

Step by step guide installation guide for ch340 USB-UART converter

Hello Friends,

In this tutorial, we will cover how to install ch340 driver for different versions of windows.
CH340 is USB-UART converter and is used for serial communication with PC/ laptop with external device e.g. GSM module, GPS module, arduino pro, etc.

Things required:

CH340 USB-UART

First of all, download the driver from link below:

Download

After downloading, extract the file and follow the steps as follows:

Step 1: Open Device Manager, go to other devices. Right click on the USB2.0-Serial

Device Manager



Step 2: Browse the directory, where you had extracted the downloaded file

Browse the directory

Step 3: Select the parent directory


Choosing directory

Step 4: Viola! your driver has been installed

Driver installed
Now, check with any terminal software. I am using Bray's Terminal.





FunWithElectronics 01 Aug 06:11
diy  tutorial  usb-uart  

Spice Up Your Bench With 3D Printed Dancing Springs

Not all projects are made equal. Some are designed to solve a problem while others are just for fun. Entering the ranks of the most useless machines is a project by [Vladimir Mariano] who created the 3D Printed Dancing Springs. It is a step up from 3D printing a custom slinky and will make a fine edition to any maker bench.

The project uses 3D printed coils made of transparent material that is mounted atop geared platforms and attached to a fixed frame. The gears are driven by a servo motor. The motor rotates the gears and the result is a distortion in the spring. This distortion is what the dancing is all about. To add to the effect, [Vladimir Mariano] uses RGB LEDs controlled by an ATmega32u4.

You can’t dance without music. So [Vladimir] added a MEMs microphone to pick up noise levels which are used to control the servo and lights. The code, STL files and build instructions are available on the website for you to follow along. If lights and sound are your things, you must check out the LED Illuminated Isomorphic Keyboard from the past.


Filed under: musical hacks
Hack a Day 30 Jul 06:00
arduino  diy  led  musical hacks  neopixel  slinky  sound  toy  

Interfacing a Retro Controller using the USBASP

An ISP dongle is a very common piece of equipment on a maker’s bench. However, its potential as a hackable device is generally overlooked. The USBASP has an ATmeg8L at its heart and [Robson] decided that this humble USB device could be used as an interface between his PC and a SNES Joypad.

A SNES controller required three pins to communicate with a host: clock, data and latch. In his hack, [Robson]  connects the controller to the ISP interface using a small DIY adaptor and programs the AVR using the V-USB library. V-USB is a software USB library for small microcontrollers and comes in pretty handy in this instance.

[Robson] does a pretty good job of documenting the entire process of creating the interface which includes the USB HID code as well as the SNES joypad serial protocol. His hack works on both Windows and Linux alike and the code is available on GitHub for download.

Simple implementation like this project are a great starting point for anyone looking to dip their toes in the DIY USB device pool. Veterans may find a complete DIY joystick more up their alley and will be inspired by some plastic techniques as well.


Filed under: Arduino Hacks, hardware
Hack a Day 23 Jun 06:00

Pedometer for Calorie Conscious Hamster Owners

The Arduino has inspired many a creative projects that can be beneficial to humanity. The Arduino Hamster Wheel Pedometer by [John Mueller] on the other hand is a creation that is meant for the cute furry rodent pets. When [John Mueller]’s daughter wanted to keep track of her hamster’s night-time strolls, her maker-dad saw it as an opportunity to get her involved in technology. The project consists of a hamster-wheel with a magnet that triggers a reed switch on completing a revolution. The entire assembly is custom-made and [John Mueller] does an excellent job documenting the build with a lot of clear images.

The wheel is affixed to a shaft with a ball bearing at one end and the entire thing is mounted on the side of the cage so that it can be removed with ease for maintenance. The reed switch is embedded in the wooden mounting block such that the connecting cables pass from inside the assembly. This prevents the hamster from coming in contact with the cabling or damaging it in any way. An LCD and the Arduino Uno are placed outside the cage and are used to display the revolutions of the wheel as well as the equivalent miles travelled.

The code for the Arduino is also supplied for anyone who wants to replicate the project and the video below shows the working of the project. The project could also be extended to count calories burned as well as running speed. This project is a prime example of how technology can be used to assist and is similar to the IoT Hamster Wheels that tweets every movement of the Hamster Life.


Filed under: Arduino Hacks
Hack a Day 20 May 12:00

Making a Mega LED Desk

Few things beat a sturdy, home-built desk — especially when it’s jam-packed with over 1200 WS2812 LEDs.

[nolobot] and his bother struggled with setting up and squaring-off the t-slotted, extruded aluminium frame which makes up the desk. He recommends practicing with a smaller frame for anyone else attempting a similar build. The surface of the desk has a few inches between the polycarbonate top and the 1/4″ plywood painted black serving as the substrate for the LEDs. Those LEDs come in strip form but still required several hundred solders, and wiring headaches in an attempt to make future upgrades manageable. Dozens of support bolts with adjustable feet support the desk surface throughout. These all had to be individually adjusted and can be made out if you look closely at the demo videos.

An Arduino Mega controls the LEDs with the help of the FastLED library. Custom code was necessary because one of the major issues [nolobot] faced was the power draw. 1200 LEDs at 5V draw quite a bit of current, so the LEDs were coded to peak at about 50% brightness. The matrix was split into different banks, while also limiting the 40A PSU to only 15A.

Regarding the final product, all we can say is: woah.

Not a fan of putting this much work into a piece of furniture? There are also ultra-minimalist options at your disposal.

[via /r/arduino]


Filed under: Android Hacks, led hacks
Hack a Day 02 Mar 12:01

Netflix becomes your personal trainer with its new DIY device

Working out can be tough, but inversely, watching Netflix is super easy. The streaming giant doesn't want to distract you from your fitness goals, though. Netflix would much rather be your workout buddy, which is why it posted instructions for making a DIY personal trainer gadget.

Source: Netflix

M2 by Macchina joins At Heart!

We’re excited to announce the latest member of Arduino’s AtHeart program. M2 by Macchinanow live on Kickstarter–is an open-source, versatile development platform for hacking and customizing cars.

M2’s design is compact, modular, wirelessly connectable, and built on the popular Arduino Due. The device can be wired under the hood for a more permanent installation or plugged into the OBD2 port, enabling you to do virtually anything with your vehicle’s software. 

Macchina, a Minnesota-based company, has partnered with Arduino, Digi and Digi-Key to develop M2, and believes that its highly-adaptable hardware will most benefit hot rodders, mechanics, students, security researchers, and entrepreneurs by providing them access to the inner workings of their rides.

M2 accommodates a wide variety of wireless options thanks to its Digi XBee form-factor socket, allowing you to easily connect your car to the Internet, smartphone, satellites, or the cloud using BLE, WiFi, GSM, LTE, and other modules.

The platform can be programmed using the latest Arduino IDE, and is compatible with a number of software packages. Moreover, given its open-source nature, potential applications are bounded only by the collective imagination of the coding community.

Interested? Check out Macchina’s Kickstarter page to learn more or pre-order your M2 today!