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0
votes
1answer
22 views

Using a Arduino Pro Mini to power more than 2 servos

I don't know very much about Arduino, but from some basic research I have read that the Arduino Pro Mini can only support two servo motors. I am trying to create a set of reaction wheels using hard ...
0
votes
1answer
18 views

Arduino PC LED strip controller

I have an LED strip being controlled by an Arduino and powered by a molex connector within my PC. I'd like to have my Arduino connected to my computer via USB 24/7, however when I do this, the molex ...
0
votes
0answers
24 views

Cannot retrieve data from homemade ECG

For the past couple of weeks, I have not been able to find a solution to my problem. My problem is that I cannot retrieve the data from my homemade ECG that I created from Arduino. I am a total ...
1
vote
2answers
67 views

Pinout of the IRL7833 N-channel MOSFET?

I downloaded the datasheet for this MOSFET, but can't find where it labels the pinout anywhere. Has anyone used these before? I got them for cheap from Amazon, and I'm hoping to control some DC lights ...
-1
votes
1answer
26 views

Serial connection via 3.5 mm Jack

lately I have been experimenting with the Intel Galileo, the thing is that I can't get the serial connection to work so I can do the "Linux magic". Today I bought this cable and tried to establish a ...
1
vote
1answer
43 views

Arduino and N mosfet lithium battery charging/discharging measuring capacity

I need an Arduino based lithium battery tester that uses N channel Mosfets to switch On charging from and external power source and discharging through a 2 Ohm resistor. I have no issues with either ...
0
votes
1answer
31 views

mechanical relay output voltage doesn't change

As a followup to my previous question, where a 2222 npn transistor wasn't beefy enough to handle the load I was putting on it to activate a solenoid valve, I decided to try a mechanical relay board ...
1
vote
1answer
47 views

How to Run 12v 1A Electromagnet From Arduino (3v) Without External Power Supply

I have a project that I am working on that uses a micro controller to control an electromagnet that I want to run with a 3.7 volt battery. I would like to reverse the polarization on the electromagnet ...
-2
votes
1answer
72 views

Interfacing a USB webcam to an Arduino board

I'm trying to connect a USB webcam to an Arduino board (Intel Galileo), the Galileo is powered by a 400 Mhz processor, has 512 Mb of RAM and 8 Gb of external storage (SD Card). I'm a computer science ...
1
vote
1answer
47 views

Bell Detector with Arduino

I am trying to upgrade our existing bell with my arduino to detect whether the bell is used and to mute the bell. The circuit for the bell runs with 9V AC. In order to minimize the wiring I want to ...
0
votes
2answers
38 views

Arduino detects voltage on ground

I've been having a hard time finding a solution to this problem. I recently ordered a 5 Volt 2Amp AC to DC switching power supply from adafruit.cc When I connect my Arduino's analog sensor to the ...
0
votes
0answers
17 views

Arduino LCD Display drawing image issue

I am playing with 3,5" (400x240 chinese unknown 8-bit controller driven) TFT display which is placed into Arduino Mega 2560 R3 board. My final goal is taking .raw data from SD card and drawing it on ...
-3
votes
1answer
66 views

find RPM from Pulse of motor [on hold]

I have an electronic gearbox motor with the following details: 25GA-370-12V -330RPM I want to find a PID control for this motor in Matlab. I take data from this motor by Arduino Due driver and an ...
0
votes
1answer
49 views

How do I detect servo stall with an Arduino?

I am controlling a standard 5-volt servo with an Arduino with PWM. My objective is to rotate the servo until it physically gets stalled (feels resistance) and then stop. Then I want the Arduino to ...
0
votes
0answers
27 views

How to wire four half-brige 3-wire strain gauge load cell to an amplifier?

First of all, i am given a task to make a digital weight machine. For this i have chosen 4 strain gauge (3-wire load cell) which you can find here. I have searched all of the links i found on the ...
2
votes
1answer
45 views

LED's connected to a relay remain on?

I built a simple project with an Arduino board. I use the board to read analog input values from a rotation sensor (potentiometer), and use the values to determine which SSR relay on a module to turn ...
0
votes
0answers
4 views

What should the frequency reading of the SPI clock be with this code? [migrated]

My Extech EX330 multimeter is reading 3.439Mhz on the pin 13 on my Arduino Uno running the following code. Is the reading correct? If the divider is 2, shouldn't I get 8 Mhz (16Mhz / 2)? ...
0
votes
0answers
26 views

activate servos 90 degrees with on off [on hold]

I built a box that has an arduino with wave shield that sends power to a pneumatic device and turn targets for a set time after preliminary commands. Different buttons give the choice of 10 or 20 ...
0
votes
1answer
63 views

Unable to Power Arduino and DC Motors via 2 AAA Batteries

I am using 3.7 V 2000mah battery. I am stepping it up to power an arduino board via an NCP1402. It has a continuous output current of 200mA. I am trying to run two Micro Metal Gear motors with stall ...
0
votes
1answer
57 views

Switching frequency of a solid state relay?

I bought a SainSmart 4 channel solid state relay recently. I am planning to use an Arduino to control some Christmas lights I've put up around my home. My question is: How fast can you switch SSR's on ...
5
votes
4answers
532 views

Wireless Home Automation 2.4GHz versus 433MHz [on hold]

Project specifications To make some things clear first(wow that sounds so arrogant): This is an Arduino project This is supposed to be internationally applicable I have experience with 433 MHz ...
-1
votes
0answers
30 views

Android Arduino USB [migrated]

I have a HCL ME U1 tablet. This has a built in USB Type A socket as well as USB Mini Type B socket. I have tested the Type A socket with a standard mouse and it works well. I have also tested it ...
0
votes
1answer
51 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 ...
-2
votes
1answer
26 views

Ardunio camera module OV5642 without sheild [closed]

Can i program OV5642 camera module attached to arduino mega without any camera sheild.Does any have the code to capture an image using it? Kindly post the code.
0
votes
0answers
6 views

Creating arduino library linking question [migrated]

I know how to create my own arduino library and use it. I am using Xcode to create a c++ project. I have the arduino library files(Servo, Wire, Keypad, etc). If I want to include the Servo.h library ...
0
votes
3answers
146 views

Why use a resistor for Pull-Up? [duplicate]

I just got my first Arduino and had a question about pull-up resistors. I was trying to connect a push-button to the Arduino at pin 2, and if it's HIGH then I write HIGH to pin 13. Now, in the ...
0
votes
1answer
58 views

What are these unpopulated holes on the Arduino Leonardo?

None of the pinouts online mention these holes next to the power barrel and LEDs. Are they connected to anything?
0
votes
2answers
48 views

Using ethernet with a camera

I own one of those little pinhole 'spy cameras' that connect to your tv.and are powered by 5v? With an arduino and ethernet shield, would there be a way for me to create an IP camera type thing?
1
vote
4answers
122 views

Sensing analog voltage on Arduino without loading the input circuit

I want to design a voltage divider for my Arduino Analog input pin, to be able to sense the change in voltage in a 9V, 250mA circuit (without loading it). Ive programmed the Arduino so that as soon ...
0
votes
0answers
24 views

Passing sensor data from Arduino Uno R3 to android with USB Serial

I would like to know how would it look like to receive data on Android from DHT11 sensor which is connected to Arduino Uno R3 via USB Serial? I was trying some code examples for Arduino but i got a ...
1
vote
1answer
37 views

How to detect several agents within a radius, what is the best and easiest way to do it?

I have a room with 30 objects which may or not be present, and I want to be able to detect which objects are in the room. My first idea was to attach a RFID tag to each one of these objects and have ...
1
vote
1answer
54 views

small scale positioning system

I have previously entered a competition called "robocup juinor australia" for a few year now with increasingly good performance each year, this year we have been sponsored for over 15k which is a big ...
0
votes
0answers
17 views

Problem with connecting Arduino nrf8002 to PC using FTDI board

According to a tutorial ( http://www.jayconsystems.com/tutorial/nrf8002_ble/ ) I'm trying to connect nrf8002 device to my PC to setup the settings using nrf Studio software. So first I connected the ...
1
vote
1answer
50 views

Detecting device/bulb/socket state without using ACS217

I am planning to do home automation using Arduino. It includes a manual switch and can be also controlled by Arduino. My problem is I want know the status of the bulb/device or socket. Recently I ...
0
votes
0answers
4 views

How to return the value in arundio function (that can be read by the connect device)? [migrated]

Right now I have an RC car program of arundio. The code is like this: ...
0
votes
0answers
7 views

Get the uploaded code from arduino by using arduino IDE 1.0.6 [migrated]

Recently bought a arduino device which already have program, it is model AR-293D and I have already connect it with my PC(windows 7) through usb when I open the IDE , It seems there is no function ...
0
votes
1answer
38 views

What are some of the reliable color sensor circuit? [closed]

We want to detect four different colors: Red Blue Green Yellow There are many different color sensor circuits using photodiode and LDR available in the internet. What are some of the reliable ...
1
vote
1answer
27 views

Bluetooth audio stream to commercial headset

I would to connect my simple audio player (Arduino + https://www.sparkfun.com/products/11125 ) to a Bluetooth headset you can buy at the market. How can I do ? Is it possible ?
0
votes
0answers
7 views

Controlling LED delays via keypad [migrated]

I'm trying to turn on LEDs based on delays entered by keypad and the same for turning them off, but the LEDs are not responding. Here is the code I'm using: ...
0
votes
1answer
60 views

Understanding capacitor usage in the Sparkfun arduino [duplicate]

In the schematic for the Sparkfun Arduino mini pro 3.3v https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v14.pdf there's a 0.1uF capacitor (C3) just left of the atmega ground ...
0
votes
0answers
24 views

HC 05 piconet 1 master 2 slaves

I was wondering if it is possible to connect 3 HC05 Bluetooth modules. I would like to have one as master sending messages to all (2 as a start) slave modules (the slaves are connected to arduino to ...
0
votes
1answer
58 views

How to connect a four route MOSFET to multiple power sources? [closed]

I have this four channel MOSFET switch: I have connected one RGB LED-strip to this, and controlling it from an Arduino, and this works great. The problem is that I need to control four of these ...
0
votes
1answer
68 views

Measuring the capacity of a capacitor with arduino?

I'm preparing for a little Arduino project that our teacher announced that will most likely be a discharge voltage measurement of a capacitor with some curve fitting in Excel. So my goal is get the ...
0
votes
0answers
9 views

Arduino software won't open in Mac OSX 10.10.1 [migrated]

I am having trouble opening the Arduino software on my mac, since I have updated Java to version 8 the Arduino software won't open. It does not give an error just closes instantly. I have tried ...
0
votes
0answers
15 views

How to prevent Ardiuno compiler from merging changing of port pin outputs into a single operation [migrated]

I want to set one pin's output value, and then set a different pin's output value so that the two pins change value one after the other. However, the compiler optimises the two calls to change both ...
0
votes
0answers
43 views

Arduino - Progamming issue [migrated]

my first post here. Anyway I'm working on a Simon Says game. I have a weird bug with the function that reads button input. This is the code: ...
0
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0answers
57 views

cellphone detection

I'm searching for advice of how to detect cellphones. So, I think that I need a Radio-frequency detector. From the scratch I'm planning to use arduino with some-board (or make it by myself). There are ...
0
votes
0answers
17 views

Cannot receive heart rate data using JYMCU Arduino

I am encountering an issue trying to retrieve a heart rate reading from an op-amp and instrumentation amplifier and sending it via Bluetooth. I used this website as a basis of my design: ...
0
votes
0answers
8 views

Serial communication between Android and Arduino - cannot recieve data correctly [migrated]

I'm attempting to send a single char command from my Android app to an Arduino Uno R3, and then receive data from a sensor based on which command is read. I've ...
0
votes
2answers
80 views

Latching solenoid control

I am working on a personal project that will involve driving a latching 9V/DC solenoid from an arduino. The circuit I've come up with is dependent on two things, that I haven't quite figured out yet: ...