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0
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1answer
40 views

Hacking a mouse with an Arduino

I was challenged in university to Hack a mouse in the following manner: What is happening: computer1 has an optical mouse connected to it, and this optical mouse has been hacked in one way or ...
0
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1answer
20 views

“Standard orientation” for stepper motors in data sheets

I just finished getting a SOYO 6V@0.8A unipolar stepper motor working, and wanted to know more about an issue I faced while doing so. I used the stepping sequence below with an L293D chip to drive ...
3
votes
5answers
212 views

Ways to configure and persist settings in Arduino-based hardware

I'm currently building an Arduino-based LaserTag Game. After solving a lot of technical challenges I'm now at the point of programming and configuring my first prototype. Next challenges: The ...
1
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3answers
48 views

Connected 2-Pin Button switching randomly from LOW to HIGH

I got this ordinary 2-pin push button and now I'm trying to read its state. Basically I want to turn a LED on and off. My board is an Arduino Uno and the button is connected to GND and Digital Pin 2. ...
1
vote
1answer
61 views

Precision 0.5 degree Stepper needed for Turntable

Basically our project brief is to design a turn table, an object weighing around 10kg which will be placed off centre (but allowing around 20kg in case) to rotate in 0.5 degree increments, pausing for ...
3
votes
2answers
338 views

Microcontroller soft off circuit not working - why?

I was making a board with an atmega328 mcu (to be used with Arduino libraries) to do some one wire communication stuff. Since I was etching the board anyway, I decided to try and implement a simple ...
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2answers
107 views

Why is the digital out acting as ground on arduino?

I was following LED Light bar project in Arduino Project handbook and I noticed some odd behavior in the Arduino. I accidentally didn't ground the back half of the breadboard (because I didn't ...
0
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0answers
44 views

Question regarding Orientation of P-Mosfet in Arduino/Microcrontrollers

I was wondering why in the Arduino schematic, and other microcontroller schematics, the P-Mosfet is connected such that the Drain is to the USB while the Source is to the input of the LDO, and not the ...
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0answers
51 views

How to take Arduino to PCB [on hold]

Note: I don't have much electrical engineering experience when it comes to designing a PCB. I have created an Arduino project that I think can be commercialised and I understand how to convert the ...
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0answers
73 views

Why use a zener diode when connecting a OLED display?

So I have this full color one inch OLED display from US Micro Products which has the driver SEPS114A. I am planning to connect it to an Arduino board using SPI, and the recommended schematics from ...
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0answers
14 views

datalogging sampling frequency bottleneck [migrated]

My datalogging system which consits of the Flora, RTC, SD card breakout board, LSM9DS0 sensor is shown in the picture below; https://www.dropbox.com/s/d8pwcn59nq11lzs/2014-11-25%2012.26.56.jpg?dl=0 ...
-1
votes
1answer
49 views

What books do you suggest? [on hold]

I am an electronics student in Italy.Given that i always like getting advice from others I would like to know what books have members of this forum suggest to read in order to be an electronics ...
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2answers
71 views

AVR USART sending garbage

I'm trying to make an ATMega328P to send serial data to my computer and print onto Putty using an arduino board to do the USB to serial conversions. The data that's printed, however is garbage data. ...
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0answers
8 views

arduino leonardo is not recognized by usb cable in windows 8 [migrated]

pls help me sir actually before the arduino leonardo working properly but from last 2 hrs when i connect it to pc though usb cable it is telling like usb is not recognized and even in device manager ...
0
votes
1answer
61 views

Measure the speed of a stationary bike with belt drive

I have a problem with the measurement of the speed of my stationary bike. (also here) Parameters: radius of flywheel is 13cm second wheel is 12cm (0.12m) the sensor is simply a reed switch I'm ...
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2answers
39 views

Controlling DC motor without Arduino motor shield

I am trying to make a line follower with the help of this tutorial. In the tutorial they have used Arduino motor shield. I want to know, is there any way to control the motors without using Ardumoto? ...
0
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1answer
59 views

Detect when device pointing at object

Let's say I have a square. I also have a device that has an emitter of some sort. I need to detect when my device is pointing at my square. Here's my question: What emitter and receivers can I use to ...
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0answers
38 views

ATmega32u4 bootloader [migrated]

Hey all this would be my first encounter needing to burn the Arduino IDE bootloader onto a blank ATMega32u4 that I bought from Digikey. What all do I need to buy in order to program the bootloader ...
0
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1answer
29 views

Connect / disconnect USB while external power source remains connected

I have some arduino mini pro collecting environment data, so they operate a long time collecting and I need to connect Gnd - Rx - Tx once in a while to transfer data to my PC, and then disconnect. I ...
0
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1answer
41 views

Emf interference on arduino and breadboard , using 74HC595 shift register, how to prevent it?

I’m using a 74HC595 chip (shift register) NPX semiconductors, connected to and arduino board. Basically the shift register switches on and off 8 leds in sequence. Everything seem to be working, code ...
0
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3answers
51 views

Making my own kotatsu

I want to make my own kotatsu (a small table with an heating element underneath) and I'm considering using a "heat lamp" as the heat source (one of those aimed at reptiles, fits in a normal light bulb ...
0
votes
1answer
58 views

Changed Op-amp, now signal is not centered

I'm making a pre-amplifier for my 9mm electret microphone to be read by an Arduino. Here's the schematic: Note that the resistor I used connected to the output is 1Meg. My supply voltage is 5V. ...
0
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1answer
46 views

Arduino in Ground-Chassis (Vehicle): Activate by grounding

I am working with an Arduino as a controller for an Aftermarket Heated Seats Kit and interface for the stock A/C Auto Control Panel (the car did not come with heated seats, and I acquired an A/C Panel ...
0
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1answer
49 views

Schematic & pin reduction

I am using arduino Uno for developing my project. There are totally 24 analog hall sensor out put,1 temprature ananlog output, 1 Rshunt voltgae measurement. There are totally 26 Analog sensor.I am ...
2
votes
1answer
46 views

Single wire CAN // Saab 9-3 I-Bus // GMLAN

I'm trying to control an instrument cluster from a 2008 Saab 9-3. It has 2 pins marked for I-Bus (both wires are green, continuity test shows they are tied together as shown here: Some sites also ...
1
vote
1answer
58 views

1-Wire Serial communication to standard RX/TX Serial ports in microcontrollers

I just want to start by saying that I'm relatively new to electrical engineering in general, so if I sound absolutely retarded please bear with me. As part of a learning project I'm working with a ...
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5answers
773 views

Safety of using microcontrollers such as Arduino

I have been learning how to work with Arduino Uno R3, and it seems very intuitive and exciting for me. As many agree, I see lots of benefits of learning to use it at a young age. I would like to ...
0
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0answers
48 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
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0answers
132 views

How do I transfer more than 1 byte at once via SPI bus? [migrated]

I have an AD5685R DAC that I am trying to communicate with over SPI. Per the datasheet, ...These [24] bits are transferred to the input register on the 24 falling edges of ...
0
votes
1answer
69 views

Arduino-like with fast ADC/DAC [closed]

I am building a tester to measure the pulse response of certain equipment. The requirement is to apply a pulse in the low us range, measure the response, apply the next pulse etc. I have a setup using ...
0
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0answers
4 views

How to connect Arduino Pro Mini with PC? [migrated]

I'm about to buy Arduino Pro Mini (http://arduino.cc/en/Main/ArduinoBoardProMini). As far as I can see it requires FTDI or similar circuit to program it. Should FTDI be present for communication with ...
4
votes
2answers
749 views

How does a ps2 mouse send data to a computer? [closed]

I want to read data from a mouse with the help of Arduino. I want to calculate relative motion between two objects. My questions are 1) Is it possible? 2) How is mouse interfaced with Arduino?
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1answer
40 views

Mosfet IRF7457PbF voltage drop too high

I'm using a mosfet for powering an Arduino mega 2560 on and off. The current drawn is less than 500mA with a 12V battery. I chose the IRF7457Pbs (RS 543-0888), with these features: VDSS - 20V RDS(on) ...
1
vote
2answers
61 views

Using LM2575 switching regulator

The LM2575 is a step-down voltage regulator. I want use it to step down from 9V to 5V in order to power my Arduino board and Bluetooth module. However, I'm not sure how to wire this into my ...
2
votes
5answers
170 views

Does the color of Jumper cables matter?

Does the color of jumper cables in a circuit matter? I'm starting out with Arduino and can't get it to work at all with a breadboard! I'm thinking it's something simple like this! I know Black is ...
1
vote
2answers
83 views

Number of bytes and file size(HEX)

I am confused regarding the (size/number of bytes) in a hex file. Taking the case of A sample Blink Arduino Program - Blink.cpp.hex On linux terminal, size command output: ...
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0answers
53 views

Getting to work RFID-RC522 reader / writer with Teensy 3.1

I am trying to use the RFID-RC522 reader / writer together with a Teensy 3.1. I cannot get it to work. I always get the error: MFRC522 Software Version: 0x0 (unknown) WARNING: Communication ...
0
votes
1answer
51 views

Jack type for a 12v DC motor

I have an Arduino with a motor shield and I use it to power 4 different DC motors. Motors are connected to the shield through a screw terminal. Since I am in the prototyping step, I am moving them ...
0
votes
1answer
72 views

Arduino standalone with 9V battery and accelerometer

I'm using an Arduino Mega for a project involving an accelerometer. Everything works fine when the board is connected via USB. When I use a 9V battery plugged in with the 2.1mm jack, values are ...
0
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0answers
19 views

How to Segment Accelerometer Signal at idle points

I'm using an 3 axis Accelerometer(GY-521) to get the acceleration data and also the gyroscope to get the gyro data. I want to segment the signals at the idle points so that i can get the segmented ...
0
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0answers
27 views

Using 3 Channel Video Switcher Module with Arduino

Hey all I am wondering how to go about switch from camera 1, 2 or 3 using this 3 Channel Video Switcher Module on ebay here. Since there's only V+, V- and signal for the "switch" it looks to take a ...
0
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0answers
48 views

Arduino Output to 24V logic

We are testing out some analog sensors, and we need to send a 24V trigger (maximum 15mA) to a PLC from an arduino. I have seen some designs using a MOSFET to make a bidirectional logic converter, but ...
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0answers
29 views

Altera DE2 compatible sensors

I'm a beginner in the world of digital systems, I want to connect an ultrasonic range finder sensor to my Altera DE2 Board, and this sensor is Arduino and pic microcontroller compatible , can I ...
1
vote
2answers
101 views

Controlling a 12v potentiometer with Arduino

I want to use an Arduino to control a motor I pulled from a treadmill. The treadmill came with an MC-60 controller. The treadmill used a potentiometer to control the motor speed. Here's a portion of a ...
1
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0answers
30 views

Arduino Serial buffer [migrated]

I am trying to write one code that takes data from serial ie. 0x4E, 0x20, 0x--, ...
0
votes
1answer
87 views

Choosing N-channel MOSFET for 12V output

I'm looking for an alternative to the STP16NF06L MOSFET N-Ch 60 Volt 16 Amp as Radioshack does not carry it. The MOSFET is meant to take a 5V PWM signal from the Arduino to drive a 12V LED strip. ...
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2answers
103 views

Embedded system for image processing project

Is it possible to do image processing (to extract numbers and text) using a microcontroller? If not, what are the alternatives to do this task?
0
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1answer
60 views

DS1307 not counting

I've got a TinyRTC board with a DS1307 on it connected to an Arduino. Setting the time and reading is no problem (using the DS1037 Arduino lib). Weird thing though is that when I disconnect the power ...
0
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2answers
58 views

arduino based pic16F877A programmer

is it possible to program PIC 16F877A using arduino uno? if it is possible, please tell me how to this;
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0answers
65 views

Connecting GSM SIM900A module with Ardunio

I have bought an SIM900A Mini V4 GSM module. Here is the module, I want to configure with arduino to send and receive SMS. Do I have to connect TXD of this module--Tx of Arduino & RXD of this ...