Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

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2answers
29 views

SPDT Relay with 8Pin

I needed a SPDT relay with 240Vac so I bought this relay from Maplin http://www.maplin.co.uk/p/15a240vac-spdt-miniature-relay-n07aw But I am heaving problem to wire this relay because it has 8 pins ...
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0answers
22 views

Sepic hardware 2 [duplicate]

Hi i am attaching more images, i hope you would understand img. 1 is the waveform at 8 V input is applied to the Sepic converter. img 2-4 are various low voltage (below 2V) applied
-1
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0answers
66 views

SEPIC hardware problem [on hold]

I am doing my project on SEPIC converter. It seems that the switching action between drain to source is happening only at low voltage. At high voltage it does not work. What seems to be the problem? ...
0
votes
1answer
99 views

How can I power this LED Matrix?

I'm controlling a 16x32 LED matrix with an Arduino and have it wired correctly (I think) but I'm having trouble with the power. I tried to follow the instructions from Adafruit but was unsuccessful in ...
0
votes
1answer
77 views

Low-cost Up-Down Servo solution

I have a small project and I'm interested "upgrading" to a more produce-efficient design. Please note I'm no electrical engineer. I want to move a small servo (like this one ...
0
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0answers
48 views

One-shot sound button/trigger for Arduino Sound Player

I've succeeded in making a simple Arduino ATMega328 sound player on my breadboard following this guide. . . http://highlowtech.org/?p=1963 http://playground.arduino.cc/Code/PCMAudio But, here's my ...
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0answers
7 views

I bought USB > FT232RL, can I use it to program a bootloader onto an Arduino? [migrated]

I bought this thing off of eBay: eBay Link Will it allow me to program an ATmega[xxx] (Arduino clone) with a bootloader? --> If so, how would I go about it? What should I do, and what should I ...
4
votes
1answer
68 views

AVR ATMega I/O pin overcurrent protection

I want protect I/O pin against overcurrent to make circuit more robust. Atmel's AVR040: EMC Design Considerations discusses internal overvoltage protection in General I/O Pin Protection paragraph. But ...
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0answers
30 views

dB Meter with Arduino and AD8307

I am attempting to construct a decibel meter using an electret mic breakout board (shown below) and an AD8307. If necessary I can use just an electret mic, and not the breakout board. I was ...
0
votes
1answer
118 views

Current draw at digital output pin differences in two equally coded segments -probable cause?

I measured the current output of an Arduino Duemilanove (with an ATmega168) in two cases and found out that the currents differ strongly. The following code creates an output of 72mA at pin 13 ...
1
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2answers
64 views

How to power my datalogger?

I am building GPS datalogger. It will consist of Arduino Pro Mini 3.3V, GPS module - GY-GPS6MV2 (GPS Ublox NEO-6M) (bypassing 3.3V regulator) or Skylab SKM53 (MT3329). Data will be written to SPI ...
2
votes
2answers
288 views

I/O series resistor

I've read that digital I/O pins should have a resistor in series in order to limit noise. Should one also use such approach when interfacing with the I/O pins of an arduino, or is that already done on ...
0
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3answers
88 views

Voltage decreases on higher current

I have a circuit composed of Arduino Mini Pro 3.3V and GY-GPS6MV2 (GPS Ublox NEO-6M). I have tried to power it with 3 different sources: 3xAA NiMH in serie connected to RAW pin of Arduino and using ...
0
votes
1answer
91 views

how to provide a steady voltage, in case of source voltage drop due to heavy consumers in the circuit

I am designing an arduino circuit in which the power source is a battery connected to some heavy current consumers, these consumers are intended to work for short time and infrequently, my question is ...
0
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0answers
15 views

Connecting the nRF24L01+ to the nRFgo studio

I have recently acquired the Development kit for the NRF8001 from Nordic Semiconductor. The kit states that it works in conjunction with the nRFgo starter kit, or can be directly interfaced as a ...
1
vote
1answer
280 views

Very hot mosfet when powering an led strip

I'm basically following this instructable which is using an arduino to control an rgb led strip. I have wired it up exactly as shown, although I didn't use a breadboard i just soldered everything. ...
0
votes
1answer
33 views

Arduino Ground reference plane

There are three GND pins on the Arduino UNO pinout. As I'm trying to design a mixed signal PCB to act as an Arduino Shield, I wonder how I should connect those pins, i.e. to the analog or digital ...
0
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3answers
399 views

Can I do without I²C pull-up resistors?

I am trying to produce a small circuit, and I am looking to reduce the part count. I recently added an I²C EEPROM which is used once when the system boots up, along with this EEPROM I added two ...
0
votes
1answer
24 views

Encoder sampling rate realization

I know that questions from a mechanical engineer might sound a little naive to you :), but here I go: I am trying to use an Arduino Uno as the brain for a DC brushless motor that we have for a ...
0
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0answers
20 views

Lockup while evaluating Wire.requestFrom function (Arduino) [migrated]

I am currently working on a Arduino project that combines an InertiaOne IMU sensor board (from Atmel), with an Arduino UNO and two motors driven by a Makeblock driver board. All sensors communicate ...
0
votes
1answer
48 views

Start a teensy sketch after USB handshake has completed or upon a button has been pressed

I have an issue in starting a sketch on my Teensy at the right time. I work in a school as an IT technician and over the summer I go through all the computers on site, log-on and check if they're ...
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votes
2answers
106 views

130V DC Motor Control

I am interested in building a control circuit for a motor. More specifically this motor. The model I want to control is the 130V model, 0.48A, which should make it at ~62W for the motor, and 1/17 ...
0
votes
1answer
64 views

Potential project: Wireless Security Camera with the Arduino Yun

I have been following Arduino and Raspberry Pi projects closely for a while and I am pretty keen on giving one a go. I have no real electronics assembly experience but can program. I have chosen the ...
1
vote
1answer
109 views

Low frequency sinus generator

I would like to build a sinus frequency generator that can be controlled via an Arduino. Sinus frequency would be in the low frequency regime (below 100 Hz) with a voltage around 2.5 Volts peak to ...
4
votes
3answers
391 views

Manufacturing Microcontrollers for portable vaporizer by first prototyping with Arduino

This question I have mainly has to deal with approaching an electronics company with just a working Arduino Nano prototype. Say I want an electronics component manufactured which consists of an ...
0
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0answers
5 views

Arduino stacking wifi and gsm shield [migrated]

I'm fairly new to this and I need some help before I buy anything... If I understand correctly I can buy an arduino, couple of shields and just stack them one onto another if they are compatible... ...
-1
votes
1answer
28 views

dual axis tracker Design [closed]

I am trying to design dual axis tracker, Here zenith & azimuth i got from Nrel MIDC calculator and MC zenith/ azimuth angle got from the Microcontroller output. Now my question here is in order ...
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0answers
42 views

Conneting an SD card reader to an Arduino [closed]

I thought of connecting a flash drive to my Arduino using a SD card reader. Is it possible by supply regulated on board 5V to flash drive? I also want to know how a USB <-> SPI adapter works. ...
1
vote
1answer
83 views

Proper PCB grounding with several general purpose ICs

I'm designing a general purpose Arduino shield pcb and right now I'm struggling to find a proper ground layout. ICs on the board: 12->5V and 12->10V @5A switching DCregulators, several H-Bridge motor ...
1
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3answers
124 views

Arduino TMP36 not enough resolution — how to improve

I have connected a TMP36 to an Arduino Uno, and eventually figured that the 10-bit resolution allows for the smallest step to be 4.8mV. Using the proper conversion results in half degree temperature ...
1
vote
4answers
83 views

Datalogging on serial flash memory

I am working on a datalogger that writes positions from GPS to serial flash W25Q64FV. I plan to write GPS data every second. I have couple of questions: With this flash memory it is possible to ...
0
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0answers
53 views

Is it possible to program a few Ardunios at the same time? [migrated]

I have 10 Arduino Pro Minis and one Arduino Uno. Via breadboard, if I connect Pro Minis in parallel, can I program all of them at same time? Is it possible?
1
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4answers
70 views

Triple pole triple throw relay

I have a turntable which rotates cw and ccw. This turntable is rotated by AC synchronous motor of 230V. I want to be able to rotate the turntable with Arduino. For this reason I need to control the ...
1
vote
1answer
47 views

How do I replace an existing servo with a geared DC motor?

I am a complete beginner, just getting into the world of electronics, in particular robotics. I have found a really nice open source set up that I want to build on and change for my own ends. The ...
0
votes
0answers
13 views

WiringPi vs default Raspbian RPi.GPIO module [migrated]

Can anyone explain the difference between WiringPi and the default RPi.GPIO module that comes with raspbian? What extra features does WiringPi have?
4
votes
3answers
137 views

Thermistor control of peltier voltage with Arduino (for DSLR chill box project)

I am mildly familiar with electronics, mostly from playing around with electronics kits as a kid. That was a long time ago, though, maybe as much as 20 years ago. I am currently working on a cold or ...
0
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0answers
22 views

Timing Issues When Interfacing with E28F800 Flash Chip

I'm trying to interface with an E28F800 via an Arduino Mega and am having trouble trying to program it. I'm successful in reading off the chip by toggling CE# & OE# while asserting an address, but ...
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votes
0answers
83 views

why would an arduino stop running?

I just designed a program for Arduino, but it stops running after a random few minutes. What could cause the Arduino to stop working? The current state of the LEDs is kept (LEDs are still bright if ...
1
vote
2answers
74 views

Is the value of XTAL load capacitors for ATmega328p @ 16MHz critical?

I'm going to try to assemble an MCU-based circuit using an ATmega328P-PU (Arduino UNO stripped down to essential parts as in this tutorial). I've skimmed over a lot of posts on EE.SE about load ...
0
votes
4answers
53 views

Using an SSR photoelectric sensor with Arduino

I'm wondering if I can use this photoelectric sensor with an Arduino. I don't have much experience with these sensors or with relays, and I'm sometimes confused by output switch ratings, so I can use ...
1
vote
1answer
54 views

LVD solution with low power indication

I power my 3.3V circuit with step-up power converter. Input to the converter should be from two Ni-MH 1.2V batteries or alternatively from two 1.5V alkaline batteries. I need to indicate low battery ...
4
votes
1answer
147 views

Can I use a transistor as a switch to close a pin to GND?

I need to short an external pin to another external pin (gnd). Link to Nikon D90 pinout. I want to control this with an Arduino, can I use a transistor for this? (e.g. BC548)
0
votes
0answers
46 views

How to power Common Cathode RGB LED

I'm trying to figure out how to power a common cathode RGB LED. The setup I have below does not work. I assumed power would flow to R, G, and B, and there would be a white light; but nothing. Would ...
0
votes
1answer
57 views

Female Rectangular Headers with Long Pins (Pass-through style)

Female Rectangular Headers with long pins (passthrough style) are used to stack/connect an Arduino shield board to the Arduino board. 1x8 and 1x6 position headers are easily found. Problem: However ...
0
votes
1answer
34 views

how to read current from sense pins of UWS-5/10-Q48 muRata chip with arduino

I have a muRata UWS-5/10-Q48 DC-DC converter chip which has sense pins and I hope to read the current draw of the load which is connected to the arduino and print out the current draw. I am not sure ...
3
votes
3answers
317 views

What is an easy way to program an ATtiny microcontroller in C without an ISP?

I understand the "most raw" method to program an AVR microcontroller is probably with an ISP such as the AVRISP mkII. However, I'm after a method that doesn't involve me having to purchase a $40 tool ...
0
votes
2answers
51 views

Connect 2 items on the same 5v port on Arduino

im kind new to the arduino and im experiencing the following problem. Me and my friend build a circuit with a distance sensor which gets the distance and visualize it. The sensor requires a 5V power ...
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0answers
12 views

Error building Arduino WiShield Flash example: 'dflash' was not declared in this scope [migrated]

I'm using WiShield library from: https://github.com/jcmuller/WiShield What is wrong with this library? The code: ...
0
votes
0answers
5 views

Cannot upload program to Arduino Duemilanove w/ Atmega328 [migrated]

This is the error I receive while trying to upload to the Arduino. I have installed FTDI drivers for mac. (http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_18.dmg) The board is ...
0
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0answers
45 views

Do I need a resistor for powering a 3-12v dc motor with USB 2.0

I'm trying to make a project from instructables: http://www.instructables.com/id/ATtiny8545-POV-Display/?ALLSTEPS And the guy uses resistors for his usb cable and now I'm not sure if I need to use ...