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-2
votes
0answers
29 views

Wireless synchronization

I want to build sensor network and I am looking for a wireless IC. Sensor: mostly accelerometers , gyroscopes , analog voltage reader (24bit ADC) Frequency of sampling mostly 400Hz and more I am ...
1
vote
1answer
45 views

Arduino analogue input from headphones

I want to use the electric signal from the headphones (2.5mm) of a NOKIA E51 phone as an input to Arduino. My intention is not to process the audio signal but rather to be able to detect when there is ...
0
votes
3answers
49 views

Liquid throughput hall sensor giving odd number of pulses plus only works in horizontal level

I'm an IT guy, but have lately started working more and more "on the edge" as we say, so close to the real world and with low level sensors. I'm currently building a liquid throughput sensor and ...
0
votes
0answers
37 views

Usb with data only?

I was having power issues with my usb hub, so I took my arduino cable, and soldered the power wires to another usb cable, which is getting its power from a wall socket. The Arduino powers on, but I ...
1
vote
1answer
70 views

Make two Arduinos communicate with electrical signals

So I need to make two Arduinos communicate. Though, I can't use any clock related system (so no Serial, no I2C...) and so my idea was basically to wire one from another so they could read electrical ...
0
votes
1answer
18 views

uln2803apg toshiba shows noise

I'm using an arduino to send a 5v signal to other devices. I'm using the uln2803apg to drive a 5v 3ampere signal. The problem, when i look at this output signal i'm seeing a lot of noise, which is ...
1
vote
1answer
74 views

Salvaging colour LCD from Brother MFC-J6710DW printer

I have salvaged a colour LCD from an old Brother MFC-J6710DW printer and I'm trying to work out its pinout, to eventually use with an Arduino. On the back it has the following characters printed: ...
0
votes
2answers
48 views

AVR-C turning led off after number of blinks with interrupts

so what I am trying to do is that I am trying to make the led blink for a certain number of times before it turns off. I want to avoid using delays so I tried utilizing the interrupt and I also used a ...
0
votes
0answers
22 views

Razor IMU interface

I have the Razor IMU from Sparkfun and trying to upload the latest firmware following the github tutorial. But while uploading using FTDI board via Arduino IDE it hangs on uploading. I cannot upload ...
0
votes
1answer
37 views

How to connect 3-wire spi with an arduino to the Maxim DS1801 digital resistor?

I just picked up an Arduino Due with the SAM3x 3.3v chip. I am attempting to communicate with a Digital potentiometer to control an amplifier's volume level but I have no clue how to go about hooking ...
-2
votes
0answers
59 views

Nano destroyed? [migrated]

Board: OE Gravitech Nano Is it possible to destroy the board if there are a voltage on a Analog pin while the board is not powered? I have a application that use a analog (speed) voltage 0-4,9 from a ...
1
vote
1answer
38 views

Migrating from the ATMEGA8 to the ATMEGA88PB

I have a simple project that only requires the UART i/f of ATMEGA8, running off 8MHZ internal RC oscillator. I have the DIP package version of ATMEGA8 and things are working fine. I have code compiled ...
0
votes
1answer
18 views

Using ADuM3150 for SPI Interface with Arduino

I am trying to use an isolator for SPI communication with the Arduino. I am presently using the ADum3150. You can find the datasheet here. There are some delays associated with this arrangement and ...
0
votes
0answers
9 views

Global Variable not able to be accessed in function? [migrated]

I am trying to compile an Arduino program that takes analog input. However, when I declare multiple global variables, it often will not compile and because it throws an error that the variables aren't ...
1
vote
1answer
51 views

how to program the smd atmega328

How do you program the smd atmega328 ic in an inexpensive way?I know you can get a factory to program the chips but is there a way to program them with arduino without one of those expensive sockets. ...
0
votes
1answer
65 views

Connect large number of MPU 6050 I2C devices

I am quite new to electronics , in my project I am trying to connect large number of MPU6050s(about 10 sensors) I2C devices and try to get the reading 'simultaneously'. Some questions that I am not ...
0
votes
1answer
38 views

File transfer between two gsm modem

I'm wanting to build a system that will store value on a SD card to form .CSV file , that this is not a problem. There will be about 1000 value recorded daily.I'm wanting to send this values to a pc ...
0
votes
1answer
59 views

RGB gets wrong values

I have Arduino which output 3 pwm signals into the gate of a irf731 FET transistors. Their ...
-5
votes
0answers
37 views

Arduino SPI project [closed]

Description: It is required to implement a software module for SPI communication protocols. The software module will run on an Arduino board as a slave device, which communicates with another arduino ...
0
votes
1answer
91 views

How to hack my Nespresso Lattisima [closed]

This morning I woke up wanting to drink a cup of coffee and, as usual, it annoys me that I have to turn on the machine only to wait a minute before I can begin brewing. I want to be able to turn on ...
5
votes
2answers
467 views

What does it mean when components in schematics do not connect?

I'm fairly new to the whole Arduino world, and I'm just really curious about this schematic that I came across... I can read the basics of a schematic, but this one has me puzzled. What are the ...
1
vote
3answers
99 views

What is the fastest and easiest way to transmit arduino's sensor data to a PC wirelessly

I have a specific problem : I'm working on a testing platform. It has to be absolutely isolated, so I cannot wire it back to my PC. I again reiterate it. There is no way to wire it to my PC. IT HAS ...
0
votes
1answer
35 views

Reducing signal noise arduino to simulink analog read

I'm using an op amp to amplify the input of a pressure sensor from milli volt to volts using with arduino. Both the amp and the sensor are externally powered using a DC power supply. I'm trying to ...
0
votes
1answer
57 views

how to communicate between 3 devices

i want to communicate between uno, mega and netduino, which protocol should i use i want the uno and mega to send information to the netduino which mean that i don't need duplex connection which mean ...
1
vote
0answers
46 views

Best Header for Arduino Nano [migrated]

I would like to be able to create permanent projects with my arduino Nano but be able to remove the nano in order to use it in other projects. The arduino Nano has 30 pins so I would be looking for ...
0
votes
0answers
16 views

Servotimer2.h is not recognised as a library by arduino uno [migrated]

I'm doing a project for school with an arduino uno. I want to control a motor using a RF-module as remote control. I need the library Virtualwire.h to use the RF-module and the library Servo.h to ...
0
votes
0answers
10 views

Accel Stepper help, stepper not going backwards [migrated]

So my question is that I am trying to use a arduino library called Accel Stepper to control a stepper motor, I made code that makes the stepper motor move one rev clockwise and then one rev counter ...
2
votes
4answers
238 views

LDO or Switching for 24V Input, 5V Output

I have a 24VDC supply that needs to be regulated down to 5VDC to power an Arduino Mega and a XBee Series 2 module. How would you choose between a Switching Regulator (LM2576T) and a LDO Regulator ...
-8
votes
0answers
120 views

Analogic Audio via Arduino [closed]

I need to make a project with Arduino. I would know how take an analogic signal from a Arduino's shield (if exist) and send via wireless. Sorry for question I am new. Thanks for answers.
0
votes
1answer
33 views

ic relay.. is there any delay for the responz of <İC insıde the circuit

Regarding SPDT ic relay TS5A3157. Do we have a delay responz inside the İc/ do we have a click sound. Because im startıng for a new project that can switch wireless, bluetooth or ir. What i need on my ...
0
votes
2answers
46 views

Reading a 1.2V-8.8V Signal into a 5V Arduino Input

An analog DC signal that ranges from 1.2V to 8.8V (from a thermocouple amplifier) is to be read from a input pin on the Arduino that reads 0V to 5V. Other that using a potential divider consisting of ...
0
votes
0answers
17 views

Circuit modification of OSBee shield for Arduino

I purchased OSBee shield board to control 24V Solenoid Valve. It utilized 5V external power to charge a capacitor and then release charge to open/close solenoid valve. However, I found sometimes it ...
1
vote
0answers
11 views

Is it possible to detect host usb device connected to arduino? and how? [migrated]

let's say that I've connected an arduino uno to a pc, or to a mobile phone via usb .. how can I detect the device type and the running operation system if it's possible?
0
votes
0answers
28 views

Control Output Power using PWM from Arduino

I am trying to make a simple control loop to power up a lamp and with that control the temperature, for that I am using an Arduino as microcontroller. The lamp I am using is a DC 12V 20W, so we ...
0
votes
1answer
57 views

Fixing a noisy I2C bus

I'm trying to get an I2C bus working but there's a ton of noise and I don't really know what's causing it. The circuit is pretty simple, an ITG-3200 and an Arduino DUE. Here is the problem: As you ...
0
votes
0answers
10 views

Turning all 35 leds on sequentially with MM5451 [migrated]

I've been struggling for a long time trying to get the MM5451 chip to light up all 35 leds sequentially without any luck. i've had intermittent help from the arudino forum, someone on youtube, and ...
0
votes
1answer
32 views

Stop timer set new value and start again AVR (Interrupt)

I have AVR MCU. I am playing with timer now. What I need ? I have timer counting up with some frequency. In each interrupt I am incrementing variable, and somewhere I need to check value of this ...
-1
votes
0answers
18 views

Using the MFRC522 RFID read with an Attiny84?

I'm trying to figure out how to run the MFRC522 RFID reader with an Attiny84. The library that is out for the reader is not compatible with the attiny series. I'm also seeing that the arduino port to ...
13
votes
4answers
821 views

Arduino resetting/hanging due to sparks in ac line

This is the PCB design of the project I have been working on recently (my first pcb design). The idea is to control ac appliances (fans, bulbs etc) without relays. I am using triacs which are ...
0
votes
1answer
44 views

closing a circuit programatically if ground can't be interrupted

I need to be able to "push" a button on a control panel using python and an arduino board. My problem here is that the button in question, when depressed, sends 16 vdc to an outgoing wire that ...
3
votes
4answers
229 views

Semaphore using one microcontroller pin

I'm trying to make a semaphore using to LEDs green and red, controlled by one arduino pin. Idea is when pin is low red LED is on and green LED is off, when pin is up green LED is on and red LED is ...
-2
votes
1answer
62 views

What circuit is used to power up a 3W LED light

What circuit should I use to power up a 3W common anode RGB LED direct from mains (220V)? I am working on a 3W rgb led which has 3 diodes connected in parallel with their + terminal as common anode. ...
1
vote
1answer
100 views

Using an FPGA over an Arduino

Having read this excellent answer on FPGA's vs Microcontrollers I have a few queries. I recently completed a project that utilised reflectance sensors. Simply put, it reads the reflectance by ...
0
votes
1answer
30 views

DC Motors Power Supply Connection

I am currently working on a project using Arduino UNO and two 3 volts DC motors. I chose a 9 V Goldtop battery to power my Arduino. The two motors draw voltage through the 3.3 V pin in the Arduino. ...
-1
votes
0answers
27 views

arduino detech signal from bike pickup coil

I want use the arduino detech signal from bike pickup coil for calculate rpm and delay ignition. Should I use a good circuit? I just started the electronic Thank you
-1
votes
0answers
31 views

AD7745/6 capacitance measurement

I am going to use AD7746 to measure capacitor in ranged 0 - 4pF. Can the resolution be 0.04fF? Finally, I would like to input the result to arduino uno.
0
votes
0answers
26 views

Problems with L293D [migrated]

The motor are not rotating in the above circuit . Or rather the Voltage between the two Motor Terminal is zero. I have checked the Pin 10 & 11 and Pin 12 & 13. They are fine and produces ...
0
votes
0answers
11 views

Arduino Uno + 2 Monster Motor Shields [migrated]

I've got an Arduino Uno and two Sparkun's Monster Motor Shields. The aim is to control 4 motors. There is no problem to control 2 DC motors with single motor shield. There's a manual how to do it ...
-2
votes
2answers
61 views

Problem connecting motor to arduino

I am trying to connect a DC motor to an arduino. When I set it up like in the first image below, it works and the motor rotates. However, when I set it up in the second image it does not work, am I ...
1
vote
1answer
78 views

Additional TX and RX pins for FT232RL Microcontroller Interface

I'm designing a board that needs to be programmable via USB and external TX/RX pins. I decided to use FT232RL ( http://www.sparkfun.com/datasheets/DevTools/Arduino/FTDI%20Basic-v21-5V.pdf ) for the ...