All Questions

7
votes
6answers
8k views

Suggested exercises for learning with Arduino

I just got an arduino and have been working through some of the exercises in the tutorials, making good progress. When I'm learning a new programming language or tool, I usually work through a few ...
3
votes
2answers
2k views

MIPS: MARS editor not showing correct value for ASCII string?

I'm using the MARS simulator to explore the MIPS cpu. I have a simple assembly program: .data ascii1: .asciiz "8C@2" I expect the value in the memory address ...
35
votes
7answers
3k views

Readable and educational implementations of a CPU in a HDL

Can you recommend a readable and educational implementation of a CPU in VHDL or Verilog? Preferably something well documented. P.S. I know I can look at opencores, ...
16
votes
5answers
38k views

What are the best free schematic tools out there? [duplicate]

I'm sure there are plenty of schematic tools available. Which ones do you use/prefer? Feel free to also list tools which aren't completely free but very popular.
5
votes
4answers
3k views

How does the Linistepper, open source linear Stepper Motor Drive work?

I have been trying to get the Linistepper to work, however I can't seem the understand the working of the circuit. The circuit is here. The issues that I'm unclear about are: What are the ...
9
votes
4answers
617 views

Precise motor positioning

I am trying to make a device that uses several motors all with an arrow fixed on top that has 8 fixed positions (N,NE,E,SE,S,SW,W,NW). I am trying to avoid servos and steppers because of the price, so ...
6
votes
2answers
2k views

Flyback protection for a DC latching solenoid?

I'm looking for a solution for "flyback" protection when driving a 2 wire DC latching solenoid. You cannot use the traditional diode solution as the polarity of the coil is reversed to open or close ...
35
votes
5answers
12k views

What's the simplest Linux capable board I could make at home?

I'd like to make a single board computer capable of booting Linux, with my low-tech garage tools (2 sided PCBs, reflow skillet, no plating through holes). What's the simplest hardware design I could ...
5
votes
4answers
3k views

how to get more power out of a astable multivibrator?

Hey I have a circuit like this, I am powering this circuit with a 6v alkaline battery, the circuit works just fine with 100uf capacitors. But the problem is I want to replace the LED with a dpdt ...
2
votes
6answers
2k views

How do you develop software for the Arduino?

Is the main way of programming the Arduino's Atmel MCU thru a Visual Programming environment such as Max/MSP? Or do you have to write typical C code? What are the different ways available?
7
votes
6answers
879 views

Is there a Cortex-M3 with external voltage regulators?

Does anyone know of an ARM Cortex-M3 microcontroller with both the 3.3V peripheral and 1.8V core voltages supplied by external sources? Everything I have found so far has an internal regulator for ...
19
votes
3answers
28k views

Is it possible to drive a stepper motor greater than 1000 rpm?

How could I achieve this? What are the stepper motor facts and principless that I have to keep in mind to design a circuit to achive this goal? Are there any readymade/open source alternatives and ...
14
votes
2answers
688 views

What type of Boolean logic circuit is this?

I need help confirming some hunches. I'm trying to figure out what type of circuit this is: Any ideas? Also, I think the logic expression for this is: ...
5
votes
5answers
23k views

How much current do you require in Arduino and embedded systems projects?

How much current do you require in Arduino/Sanguino or other embedded systems projects? After responding to the LM2575 inductor question I started to take a closer look at the TI power DC-DC ...
5
votes
4answers
888 views

How to get into Freescale 32-bit MicroControllers?

Which websites/blogs/tools/books/manuals would you recommend for getting into the Freescale microcontrollers, especially the 32-bit models? What are the best development tools (IDEs, compilers) for ...
22
votes
13answers
28k views

Intel HEX (.hex) viewer/readers

Lately I've been doing a lot of work with Intel HEX files. I want a program that can import an Intel HEX file and allow me to view the byte contents at each address. There are a handful of programs I'...
4
votes
8answers
2k views

It's been more than 10 years (since I designed hardware with RS-232), and we're still using RS-232?

Are there any alternatives to this ancient yet still popular way of communication?
7
votes
1answer
4k views

How can I use avrsim to simulate Arduino?

I found vary nice open source avr emulator ( http://gitorious.org/simavr). Since there is uart emulation implemented it can simulate Arduino. There is board_simduino example, but I have some problems ...
20
votes
5answers
12k views

Is there a common netlist format?

Is there a common netlist format that is portable between different schematic/pcb/EDA/CAD tools, and if so where is the format or reference so I can implement it? If not, does each package implement ...
8
votes
5answers
4k views

Cold weather battery power

I've built a temperature sensor module that runs off of 4xAA batteries and sends data back to a computer via XBee. Works great, until the weather gets cold. At that point, the rechargeable AA ...
10
votes
4answers
464 views

Sharing and Notating Schematics?

So a friend and I were talking about schematics at work and how we can better communicate among us and our co-workers. I know Kortuk had asked a question previously that was similar, but that question ...
8
votes
5answers
1k views

What are some of the more compelling use cases for plug computers? [closed]

Are plug computers useful for anything besides network-attached storage? I know that you can hang a bunch of drives off them, maybe set up your own web server. But those uses have limited ...
22
votes
11answers
24k views

Injecting a communication signal over DC power supply lines

I'd like to be able to daisy chain multiple devices using just the power supply wires and then inject a communications signal over the power lines to turn it into a half duplex network. Are there any ...
18
votes
4answers
18k views

How does an audio jack detect when a speaker is plugged in?

Some sound card audio jacks can now inform recent Windows OS's that an audio device is plugged in. Anyone know how it does this? I'm thinking it uses some kind of voltage comparator or resistance ...
3
votes
2answers
2k views

Inductor for LM2575

Can anyone suggest a 330uH inductor and associated Eagle .lbr for use with an LM2575? I've been looking all day for this! Any suggestions would be appreciated.
23
votes
10answers
16k views

Cheap 1MHz oscilloscope

I'm learning electronics (and basic electricity) and I wondered if a 1MHz oscilloscope like the DSO Nano is enough for (very) basic electrical and/or electronic circuits. I'm almost broke and I need a ...
17
votes
2answers
3k views

How might you use a LiPo battery as backup for mains power loss?

Many people seem to run their projects off the mains (e.g. with a wall wart) or from a battery, but there doesn't seem to be too much discussion about how to run a device off the mains, charging a ...
19
votes
6answers
12k views

Reusing laptop monitors

I have a 17" laptop monitor with a 1920x1200 (WUXGA I beleive it's called? or just UXGA?) resolution which I simply love. Now, assuming the laptop dies before the monitor does, would anyone know if it ...
9
votes
3answers
622 views

What is a sensible approach to connecting devices to your computer via wireless technology?

I remember with fondness the X-10 days, when you could connect your computer to every wall plate in your house, using power-line carrier to transmit signals to addressable receivers (with varying ...
6
votes
3answers
8k views

Is there any way to determine the correct voltage for a stepper motor?

I recently bought a CNC mini-mill at an auction. It is fitted with steppers on the three axis. The X and Y are the same, and the Z is a bit smaller (physically). All the markings were removed from the ...
18
votes
7answers
35k views

How many individual lights can an arduino control

I want to use a regular Arduino board to control LEDs - what is the most lights I can control individually from the board? Is there a tutorial on how to hook it up?
6
votes
2answers
2k views

Can I combine the power supply?

Here's the circuit I'm working on, it's a robotic stringed musical instrument thing, that uses 6 DC motors and an Arduino Duemilanove - The resistors are 0.25w 1KΩ The transistors are TIP122 ...
7
votes
3answers
2k views

Prototyping a part with 2mm spacing on 0.1" matrix board?

I have an Airwave AWM682RX 5.8GHz video received and matching AWM683TX transmitter module. Oddly, one has pins spaced at 0.1", the other at 2mm. So, what's the best way to make a part with 2mm spaced ...
37
votes
5answers
51k views

Stripboard/veroboard/matrix board design software

I'm prototyping a simple layout for a small project on matrix board, but figured there must be a better way than drawing it all out on paper. Are there any aimed at matrix board? I've found the ...
9
votes
2answers
392 views

Batteries for 12- to 24-V motors

I have some nice gear motors that run on 12 to 24 volts, and want to use them in a medium-sized mobile robot -- maybe 30 cm * 30 cm for the base. I only expect it to run indoors, or possibly outside ...
19
votes
6answers
11k views

Simple Circuit Simulation tutorial

For the last few days I have been trying without any luck to find a good tutorial on simple circuit simulations. I am a relatively new hobbyist and I figure if I use simulations and play around the ...
5
votes
3answers
365 views

How to supply power from vehicle to a low power device?

I am a programmer with only basic understanding of electronics/electricity. I am trying to install this device into my vehicle. The device accepts a wide DC power input (10V to 30V), but has a ...
2
votes
3answers
813 views

How do I program an AVR Raven with Linux or a Mac?

This tutorial starts with programming the Ravens and Jackdaw with a Windows box. Can I do those initial steps with a Linux or OS X machine instead? If so, how? Is there any risk of bricking the ...
4
votes
3answers
14k views

Hooking up an LCD to Arduino Diagram

Has anyone got a really clear diagram of the way to link up a 16x2 LCD screen to an Arduino? Basically I have an LCD for which the back light is coming on, but I am not getting any words appearing on ...
2
votes
1answer
295 views

Cases for Phidgets boards [closed]

Are there cases for Phidgets IO boards such as the 1019 ?
4
votes
4answers
793 views

1.25-28V var. power supply mod

I have a 1.25 to 28 V variable power supply I'm working on. here's the schematic (from here): What I'd like to do is put in a fan (12v 0.16A) so it runs when i turn it on, however i don't know where ...
2
votes
1answer
258 views

Develop Snap-On Board For Easy Connections - Rabbit SBC

At my Company, we are using the BL2600 (Seen here) to create a new automation controller to replace our older controller. Rather than have electricians have to terminate wires into a Molex connector ...
4
votes
3answers
3k views

Using Arduino to program Amtel AVRs via ICSP header

I have an Arduino (NG) board with an ATMEGA168 AVR micro. The board has a 6 pin ICSP header. Here is what I propose to do, please tell me if it is possible: Remove current ATMEGA168 IC Replace with a ...
25
votes
6answers
17k views

How do I physically work with a hobby motor?

How do I incorporate a hobby-style motor into a project, physically. How do I mount it and connect a wheel to it? (Assume that I have a working H-bridge or even switches, and am not concerned about ...
4
votes
5answers
2k views

MSP430 programmer

I was hoping you would share with me info on making my own board for programming. I recently came into a handful of MSP430F20xx that I'd like to play around with, but my student budget isn't offering ...
4
votes
1answer
1k views

Arduino Speed Controllers for RC Cars

This may be a lame question but, Speed controllers on big RC cars can they be controlled from Arduino? If yes, do they have a standart? do I control them using PWM values? What should i look for if I ...
4
votes
1answer
121 views

Specs on Siliconix SSTC34-T1

I have been gifted about 2/3 of a reel (2000-ish) of these SOT-23 parts but I cannot locate any data for them. Can anyone point me in the right direction. Through the various datasheet sites I have ...
2
votes
4answers
159 views

Dealing with excess heat

As a sort of weird side project, I'd like to make an oven timer that has selectable food stuffs and associated timing information. Now while this device would be simple to make I would like to stick ...
3
votes
4answers
2k views

newbie code query => Arduino & DS18B20

been using picaxe for a few years but now playign with arduino and trying to learn how it all works. I have a couple of arduinos talking via the HOPERF library successfully and now want to send some ...
4
votes
2answers
1k views

AVR Stick Data Logger Usage

Has anyone used this data logger (or similar) with v-usb to collect data? http://www.sparkfun.com/commerce/product_info.php?products_id=9147 If so, what is the maximum times per second voltage data ...

15 30 50 per page