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1answer
37 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
46 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 ...
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: ...
1
vote
1answer
56 views

ATTiny IR receiver logging erratic values, but works consitently on Arduino Uno

I am making a an ATTiny85 IR receiver, programmed with an Arduino Uno. I'm using a modified version of this code (because the other IR libraries I found weren't compatible). It's working... sort of. ...
0
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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
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1answer
67 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 ...
2
votes
1answer
574 views

ATTiny Default AREF

I am trying to get the Adafruit Electret Microphone Amplifier to work with an ATTiny85 but am having some trouble with the reference voltage. I am using a 5V circuit because I am also powering a strip ...
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 ...
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2answers
47 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
1answer
170 views

Bluetooth Low Energy Proximity sensing less than 2 feet?

I am working on a project where I need a TX and RX to be able to sense if the modules are within 2 feet of one another. Ideally, we would like to only utilize BTLE 4.0 for both devices since power ...
0
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0answers
21 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 ...
1
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2answers
409 views

Controlling Niko Home Control

I would like to know if anyone has been able to take control over 'Niko Home Control' with a PC or microcontroller (arduino)? I Googled, but can't find much on this topic. Is it even possible? I ...
0
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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 ...
0
votes
1answer
91 views

Can I use arduino to feed this circuit instead of an external power source?

I am following this tutorial to connect the output from my guitar with arduino. I'm wondering: is it possible not to use the batteries, and to feed the circuit with the 5V output pin provided by ...
-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 ...
2
votes
1answer
3k views

How to check a 433Mhz module on an Arduino

I am new to arduino and electronics so please bear with me :) I would like to build a 433 MHz receiver which output I would later feed to a RPi (that will be the easier part for me). I bought a set ...
1
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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 ...
2
votes
1answer
1k views

Problem writing to MCP23017 I/O Expander registers (i2c)

I am creating a basic cable tester device and using I2C to interface with two MCP23017 I/O expander chips. In my code each MCP23017 slave has its own address and I can communicate with both of them ...
1
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2answers
180 views

Powering and controlling multiple 12V LED strips with Arduino LilyPad USB

I'm trying to use an Arduino Lilypad USB to control several separate 12V white LED strips. I am however struggling to work out how to power them. The LilyPad only operates at 3.3V and I thought a ...
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 ...
3
votes
2answers
14k views

Can you use an Arduino Uno as an ATMega328 Programmer?

I dont have an Uno but I was thinking of getting one and by the looks of it, you can remove the AVR microcontroller from the Arduino, right? Its just a DIP IC in a socket that can be pulled out, seems ...
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
204 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 ...
0
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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
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1answer
50 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
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 ...
0
votes
1answer
56 views

RGB gets wrong values

I have Arduino which output 3 pwm signals into the gate of a irf731 FET transistors. Their ...
0
votes
1answer
89 views

bipolar linear hall effect sensor choice

ANSWER: This is the best one I found for my purpose mouser.be/new/Texas-Instruments/ti-drv5053-hall-effect-sensor I'm doing a project where I use Hall effect sensor as a proximity meter. Using to ...
1
vote
3answers
849 views

Suggestions for solar / LiPo powered 3.3v supply for Arduino

I am building several slightly-differently-purposed Arduino + Xbee systems to monitor various things around my home and property. Some of these are line powered, while others must use solar. Many ...
0
votes
1answer
171 views

HX711 amplifier

I have one of the HX711 ADC devices that I want to use for a weighing application. I've fitted it to a breadboard and used demo firmware to poll the chip for readings. The behaviour is as follows: The ...
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
147 views

Arduino Nano Clone Unknown device

just bought 2 Arduino Nano clones. They are using CH340G to communicate over usb. Issue is that one device is showing up in Device manager (win7 x64) as com port 26 with CH340G driver and all works ...
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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. ...
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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
90 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
466 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 ...
13
votes
4answers
819 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 ...
1
vote
3answers
97 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
69 views

how can we detect overspeeding through sensor or by building up circuit ??

I am working on project to detect overspeeding through sensor. but i am not getting any information regarding sensor. All i want to do, sensor inside vehicle with arduino and gsm which will send out ...
1
vote
4answers
922 views

Why there is only 4.5V at the 5V output of my arduino board?

I have an Arduino Uno R3. At the 5V output port of the board with nothing connected and blinky running while powered through USB, I can measure only 4.5V. Is this normal? Or is there anything wrong ...
0
votes
1answer
78 views

problem of transmitting data from serial device to bluetooth on Arduino

I am using an accelerometer which uses serial communication on Arduino (UART), I wish to transmit the data to a bluetooth module (blusmirf gold) using I2C and finally read it from my android ...
1
vote
1answer
90 views

Garbled serial on custom Arduino Uno

I built my own Arduino Uno. I designed the schematic and laid out the PCB for a school project. I am having problems getting the serial communication to work so that I can program sketches. Here are ...
0
votes
1answer
34 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
3answers
174 views

Should I use a snubber or solid state relays on a 24 vac circuit?

I'm trying to create a smarter controller for my hydroponic systems. I have an arduino controlling a sainsmart mechanical relay. The load on the relays are 24 VAC orbit sprinkler valves. Everything is ...
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
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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
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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
234 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 ...
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 ...