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24 votes
7 answers
4k views

Good book for non-beginner firmware development

I do a lot of firmware work at my job, but I'm looking for more advanced books on the topic. Things not like the basics of "what is an interrupt". I'm reading the O'Reilly book on embedded systems ...
Seidleroni's user avatar
  • 1,684
7 votes
5 answers
520 views

Good motor supplier?

I'm looking to start a few different projects and stock up on some basic components - I was just wondering if anyone knows a good supplier of DC motors, stepper motors and servos? I'm in vicinity of ...
Sketchy Fletchy's user avatar
10 votes
4 answers
4k views

Bi-Directional Step up and Step down (3.3v <-> 5, etc)

So I've been reading a few threads here and on other forums. I understand there are various solutions for stepping down or up a voltage. What I have found are the LVC series shift regs that give a ...
cyphunk's user avatar
  • 602
39 votes
11 answers
34k views

Stranded vs solid wire

What are the advantages of stranded vs solid wire? what should i be using for prototyping circuits?
SaM's user avatar
  • 902
295 votes
38 answers
121k views

Basic Electronics Book [closed]

I need basic electronics books (diodes,transistors,current.. etc) as I am just starting out with electronics and want to have something to read over the holiday. Any suggestions of good beginners' ...
2 votes
3 answers
527 views

ultrasonic setup guide

Does anybody know of any online resources that go over the setup of driving ultrasonic transducers, as well as how to receive an ultrasonic echo, and pick it out (for rangefinding)? I found this ...
Nathan's user avatar
  • 279
7 votes
5 answers
2k views

PCB etching with transparent film

After etching a PCB I discovered a big spot across some of the traces - probably from a finger. I transferred the PCB layout from a transparent film. What would be the best way to remove "finger" ...
user avatar
9 votes
5 answers
11k views

Is there a single IC that can control a 8x8 RGB LED Matrix

I was wondering if there was a single IC like the MAX6960 that could control a whole 8x8 RGB LED Matrix because the MAX6960 can only control a RGY.
GLaDOS's user avatar
  • 263
4 votes
5 answers
2k views

Trig Functions In PicBasic

I've been trying to figure out how to implement trig functions in my PicBasic projects. I could use a lookup table but that limits my output. I need to be able to use sin, cos, tan, and their ...
user avatar
5 votes
1 answer
617 views

Hacking/Controlling BLDC from CD-burner

I have an old CD-burner (HP 9100 plus) where I would like to control the BLDC motor from. My idea is to use the original IC of the burner as the driver and use an ATtiny13 for controlling it. There ...
Lars's user avatar
  • 339
5 votes
2 answers
289 views

What does 'cathode-row' mean?

"The MAX6960–MAX6963 are compact cathode-row display drivers" What does cathode-row mean?
GLaDOS's user avatar
  • 263
21 votes
11 answers
7k views

Op-amp tutorial for electronic noobs?

Can anyone point me to a tutorial for electronic noobs that explains how to use op-amps and what I can do with them, besides amplification?
Nikolaus Gradwohl's user avatar
4 votes
2 answers
427 views

Distance sensor IR

I am building a distance sensor..I have the ucontroller portion done. I was going to use IR to reflect a beam and get a proportional analog voltage to estimate distance but...it has no range Any ...
user avatar
12 votes
7 answers
2k views

Custom PCBs... what can go wrong?

I'm anxiously awaiting the delivery of my second set of custom designed PCBs from BatchPCB. The first board I designed was pretty darn simple and didn't have any problems. This second set includes a ...
edebill's user avatar
  • 2,519
8 votes
5 answers
1k views

Synchronise multiple Mega boards to run multiple servo motors

My friend Jules asks: The aim is to get as many servo motor controls as possible - looks like the maximum an Arduino will output is 14? Digital I/O Pins54 (of which 14 provide PWM output) I ...
mad_z's user avatar
  • 5,050
6 votes
1 answer
391 views

High Temperature Humidity Sensor [closed]

Where can I get a high temperature humidity sensor for temperatures up to 700 or 800 degree Fahrenheit (~ 370 or 425 °C)?
mad_z's user avatar
  • 5,050
8 votes
5 answers
7k views

LEDs for full daylight

I'm working on making a sign that will be outdoors in full sunlight and I want it to have the longest range visibility. This is a project for university and I will probably need 100 LEDs or so - I ...
SaM's user avatar
  • 902
13 votes
4 answers
28k views

How do you build your own RFID reader?

What's involved in building your own RFID reader? As you guys would know industrial RFID readers aren't cheap, how do you energise the antenna, then read back the output?
littlebirdceo's user avatar
5 votes
3 answers
5k views

Voltage level shifter

I need to make a voltage level shifter. It needs to translate a TTL logic level into a 12 V logic level. I have applied the 5 V at the base and 12 V Vcc and took the output from the ...
SaM's user avatar
  • 902
20 votes
15 answers
107k views

Good tool for Mac OS X to draw circuits

I am looking for tool to draw circuits on Mac OS X. I mostly need it so I can add it into presentations. So the requirements are that it looks preety.
Lucas's user avatar
  • 525
7 votes
6 answers
5k views

Where can I source extra long headers from [closed]

I have recently purchased a sparkfun protoboard that I wish to stack above an ethernet shield. (I have 2 different ethernet shields, an Arduino one and a seeed studio enc28j60 shield.) The problem I ...
Hamish Currie's user avatar
6 votes
2 answers
2k views

Programmable current source

I need to build a programmable current source from a 8051 microcontroller. It needs an output current from 0 to 10mA maximun. How do i go about doing this? what circuits do i need to build? I was ...
user avatar
3 votes
4 answers
5k views

Arduino Text to Speech

has anyone used the arduino to convert text to speech?
user avatar
29 votes
6 answers
26k views

How to convert AC to DC

I am designing a circuit that needs to output 5VDC @ 1A. I'm trying to use a wall transformer to step the voltage down to 12VAC. The next step is the diode bridge and ripple capacitor. The ripple ...
Robert Deml's user avatar
  • 3,252
7 votes
4 answers
10k views

Cheapest, simplest way to implement a Bluetooth keyboard/mouse?

Thinking of building a device for sending text and probably mouse movement into a computer, but I want it to be wireless and compatible with many computers/PDAs/phones without a specialized dongle, ...
endolith's user avatar
  • 28.8k
4 votes
1 answer
794 views

Running AVRStudio 32 and JTAGICE MKII on Vista 64

I've attempted installation of AVR studio 32 (for AVR32 UC3 development) and it doesn't appear to work. Has anyone here gotten this to work in Vista 64?
Adam Davis's user avatar
  • 20.5k
8 votes
6 answers
3k views

How can I convert the output from a momentary switch to a pulse on push and a pulse on release?

The title pretty much says it all. I have an idea to try out involving a op-amp differentiator circuit and a diode bridge, but I am flying blind. Also I am trying to accomplish this without a micro-...
noise's user avatar
  • 161
3 votes
4 answers
4k views

Controlling DC (Pager) Motor with Audio Signal

I'm trying to control a DC (pager) motor with a sound signal so that I can use an audio synthesizer to control the speed of the motor. I'm hoping to modulate the speed of the motor at audio rate (1-...
3 votes
4 answers
1k views

Reasonably priced laser cutting service in the UK? [closed]

Has anyone had any experiences with laser cutting services in the UK? I've googled but most of the results seem to be for expensive industrial setups. What I'm looking for is someone who can do pretty ...
Len Holgate's user avatar
  • 1,078
13 votes
6 answers
8k views

PCB prototyping with Presensitized copper boards

I'm currently working on my first PCB prototyping by using some pre-sensitized PCB board, purchased from Maplins UK. However, I'm having terrible trouble exposing and developing the board, it just ...
H3liosphan's user avatar
8 votes
3 answers
8k views

Why the resistor in this op-amp circuit?

Here's a circuit diagram for a signal response test circuit from the spec sheet for a HA-5195 op amp and looks like a non-inverting amplifier circuit with a gain of 5, plus the 200Ω resistor between ...
Grumdrig's user avatar
  • 505
17 votes
17 answers
2k views

What do you wish you had known before you started with Microcontrollers?

When working with AVR microcontrollers or Arduinos, what is something that if you had known sooner would have saved you a lot of time or frustration?
21 votes
9 answers
6k views

Is Arduino ideal for making a HRNG (hardware random number generator)?

I'm putting together a design for a hardware random number generator that will utilize multiple sources of entropy (combined): Ambient light Ambient sound (and sound levels) Ambient temp Ambient ...
Tim Post's user avatar
  • 743
4 votes
3 answers
2k views

Audio Frequency Shift Keying to Arduino

I am attempting to have an Arduino interpret an AFSK signal, this is very vague but can anyone just point me in the right direction for detecting the frequency of the AFSK signal with an arduino?
zklapow's user avatar
  • 1,551
2 votes
2 answers
1k views

Phone RF Module Interfacing with an Arduino

A little while ago I desoldered a 900 MHz phone and its base's RF modules and was wondering if anyone could help me to interface them with an Arduino, or just help find a datasheet. The numbers on ...
Devin's user avatar
  • 21
13 votes
6 answers
3k views

Starting out PIC Programming

I've been looking into doing some PIC Programming, but unlike some of the other microcontrollers available the sheer number of different chips available has caused me some confusion. It also appears ...
Amos's user avatar
  • 2,893
10 votes
7 answers
3k views

Is Parallax Propeller a good product? [closed]

How does the Parallax Propeller stack up against other multi core solutions? I just saw an article about the open stomp project that won their design contest. I wanted to see what other people ...
Scott Murphy's user avatar
9 votes
2 answers
2k views

How to redesign a circuit to use a current sinking IC rather than a current sourcing IC

I'm building a serial servo controller to learn about electronics and assembly language as part of my hexapod robot project. Quite early on I decided that I needed more I/O channels than my ATTiny2313 ...
Len Holgate's user avatar
  • 1,078
56 votes
5 answers
52k views

Programming microcontrollers: JTAG, SPI, USB oh my!?

I've noticed, with regards to microcontrollers, there are several way to program them. I am sorta familiar with USB as my Arduino's can be programmed via USB. What is a JTAG or SPI interface? ...
jdiaz's user avatar
  • 1,943
5 votes
7 answers
18k views

What sort of things can an Arduino do?

Sorry for the question, I'm just starting out in robotics - as a hobby- and I was just interested in what I'll be able to actually do, please let me know,
user avatar
7 votes
3 answers
5k views

Apple Desktop Bus (ADB) to USB Adapter

I have an old Apple keyboard that I would like to use but it uses the ADB bus instead of the newer USB bus. Griffin used to produce a product called the iMate which was an ADB-to-USB converter but ...
jdiaz's user avatar
  • 1,943
5 votes
2 answers
338 views

Crystal radio as user interface problem

If I built a coil like the one in this crystal set. How could I use a micro to detect which point the alligator clip is on? Basically I want to use the crystal set as a user interface for an audio ...
user avatar
0 votes
3 answers
192 views

Experience with Pololu Robots [closed]

Has anyone had much experience with the Pololu Robots Which are the coolest? what do you recommend i get? I'd like to hear about some cool projects with these Robots :)
mad_z's user avatar
  • 5,050
39 votes
6 answers
18k views

Switch between 5V power supplies?

I'm designing a board that can be powered either by USB or an ATX power supply. They can both be plugged in at the same time, independently. I'd like the ATX to provide 5V if its plugged in, but ...
user avatar
3 votes
3 answers
2k views

VGA monitor as the display for VHS player

How do I connect an LCD monitor to be the display for a VHS VCR?
user avatar
4 votes
3 answers
909 views

3pi Robot with Bluetooth

I want to use bluetooth to grab the info off my 3pi rather then have it display on the small LCD. Pololu provides a lib for serial communication. I'm wondering what the best bluetooth/serial module ...
SaM's user avatar
  • 902
11 votes
2 answers
2k views

Unit testing AVR assembly language

How do you unit test your assembly code? I'm working on a serial servo controller as part of a hexapod robot project and the code has got to the point where it's becoming complicated ;) Anyway, I'm ...
Len Holgate's user avatar
  • 1,078
2 votes
1 answer
3k views

Connecting bluetooth to Lilypad Arduino

How do i connect bluetooth to Lilypad Arduino?
mad_z's user avatar
  • 5,050
9 votes
7 answers
16k views

Encryption Library for Arduino

I am using an Arduino to read a keypad and open an electric strike upon keypad PIN entry. For this sketch I wanted to use some sort of lightweight encryption to store the PINs in EEProm. Does anyone ...
user avatar
2 votes
4 answers
522 views

Has anyone used a SpokePOV in the rain?

Will they survive wet weather?
user avatar

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