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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0
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2answers
135 views

What's the difference between an infra-red and a normal phototransistor?

I was wondering if there is any difference between an infra-red phototransistor and a normal phototransistor. I was also wondering if either of these would be directly compatible with an Arduino? ...
0
votes
0answers
13 views

Cheapest WiFi Linux Stack for IoT Device [on hold]

For a production IoT device (not prototype), a thought exercise: What is the cheapest hardware stack with roughly these specs and what is the cost (roughly)? Some MCO with GPIO for connecting a ...
0
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0answers
16 views

arduino manchester encoding two receivers [migrated]

I want to make the arduino receive from two receivers. I am trying to make another pin receive signals from another connected receiver in the pseudo code below, how can this be done?: ...
0
votes
1answer
101 views

How to amplify the signal of a TCRT5000 phototransistor

I'm trying to read the IR signal from my Itron C1S Power meter. It has an emitter that lights up for 10 ms every Wh of consumption. This question is based on my prior question: Use a photoresistor ...
0
votes
1answer
67 views

Use 555 for additional 40KHz PWM in Arduino

I need to transmit infra red signals using IR LED from my Arduino device. The IR signals consist of PWM 40 kHz periods and "silence" periods of various length (typical IR remote signals). I know ...
6
votes
2answers
1k views

Arduino Tweeting Weather Station

I want to create an Arduino Weather Station with Temperature Rain Gauge Wind Speed Wind Direction Humidity What peripherals should I be looking at getting? Ideally I want this project to tweet the ...
3
votes
1answer
77 views

Multiple nrf24l01, shared power, ripple/interference, DSO screenshot provided

I've got this circuit with 3x atmega328 & nrf24l01+ running off shared power supply, either 2x AA battery or 3v3 reg. It acts as a repeater, and depending on the origin of the message and the ...
0
votes
1answer
43 views

Calculating mV/g of a sensor

I have constructed a piezo-resistive sensor using graphite. I managed to obtain the output voltage of 0-5V by using the ADC of my Arduino to read the sensor. But I have no idea how to calculate its ...
2
votes
2answers
100 views

Reading corresponding pins from a circuit diagram

I am completely new to Arduino tinkering and am trying to make sense on how to wire a 8x8 LED matrix using the following diagram: This chart is supposed to correspond to this 8x8 LED, 12x12pin LED ...
4
votes
4answers
5k views

Making two Arduinos talk over SPI

I'm trying unsuccessfully to make two Arduinos talk using SPI. I found this great tutorial. The SPI Master send a constant string each second to the SPI Slave, which resends to the USART for ...
1
vote
2answers
61 views

Shape Memory Metal framed sail

I am working on a costume prop that utilizes a triangular cut sheet of emergency blanket spined with a single 12" long, .04" dia piece of nitinol wire that has a transistion temp of 115deg F. My plan ...
1
vote
3answers
128 views

Excessively high temperature reading with LM35

I am really new to electronics and I am just experimenting at the moment with a breadboard. My question here is related to the LM35 temperature sensor and Arduino micro controller. I am getting a ...
0
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2answers
60 views

Controlling AC mains using Arduino and removing control easily

I am planning to for an Arduino to read status of a switch, and accordingly switch on and off AC appliance, for a demo purpose. I want to add a feature to it of easy recovery to manual switch control. ...
0
votes
0answers
39 views

Canon EF SPI data protocol and IS activation

I have been trying to find information about Canon EF data protocol between lens and body. So far I have seen examples how to control focus or aperture but I would like to know how IS is activated. Is ...
1
vote
1answer
140 views

MFRC522 on Beaglebone Black

I am trying to get my RC522 to work on the BBB. It works great on my Arduino which is well documented e.g. here or here. My only requirement is to read the serial # of cards which are Mifare S50. I ...
1
vote
2answers
59 views

Designing an ABBA circuit (3 input, 2 output) inputs: (GND, +V, Logic)

I'm working on a relatively simple Arduino project and want to reach an elegant solution for a circuit. I'm not sure if there is an existing IC for what I want to do, but here is a diagram for what ...
0
votes
1answer
60 views

Detect alternating current using one contact only and arduino analog input

I am trying to setup an arduino so it can detect an AC where it only has access to one pole. (kind of like these "electricians screwdrivers" that you put in one of the connections of an electric ...
0
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0answers
56 views

Using an Arduino for learning embedded C programming [migrated]

I'm a computer systems engineering student and was planning to buy an Arduino to learn embedded C programming. After researching I found mention that an Arduino may not be a good choice for a beginner ...
1
vote
2answers
133 views

Can I embed this charger in a project?

I have been attempting to create a portable arduino gaming system. While I have tried normal 'AA' or 'AAA' batteries, they are too large, so have decided to use a lipo battery. I now have this, but I ...
0
votes
1answer
120 views

Arduino dies after activating a 5th led

I have an Arduino Uno, using a MAX7219 to control a 8x8 Bi-color led matrix. The problem however, is that upon activating a 5th led in the matrix, the unit "dies", in lack of a better word. I can ...
0
votes
1answer
48 views

tlc5947 LED driver without constantly occupying uC pins

I am working on TLC5947 chip to control 24 RGB Leds to create different patterns with them. My concern is, I have to keep giving command to SIN, SCLK, XLAT pin of microcontroller every loop to keep my ...
0
votes
0answers
7 views

bitRead() gives wrong answer Arduino UNO R3 [migrated]

I am trying to read from a quadrature rotary encoder using an Arduino UNO R3. This is done by connecting the encoder's channel A pin to the Arduino interrupt 0 pin (digital IO pin 2). Inside the ...
0
votes
1answer
31 views

Bluetooth headset button replacement

I have a Samsung HM1300 headset and want to emulate the call button signal via a microcontroller. Here is a pic of the inside of the headset: (Original) The gold button is the call button. I see ...
0
votes
2answers
226 views

SIM908 GSM and GPS modules individual power control

I've been searching around google and even in manufacturer site for this information and found nothing relevant. Is it possible to turn off GSM module and keep turned on the GPS? How can it be done? ...
0
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0answers
18 views

Hacking a Bluetooth headset

So I have a Samsung HM1300 (http://www.samsung.com/us/mobile/cell-phones-accessories/BHM1300NBACSTA). I would like to hack this device, and transmit the button data from the call button for something ...
0
votes
1answer
43 views

Replace potentiometer with digital version (Speakers)

I am trying to get my PC speakers to be controlled by my arduino. I've taken apart the control and it seems very straight forward, just need a few questions about subbing the manual pots for digital ...
0
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0answers
28 views

Sensor to detect that the subject is still close

I'm thinking about starting a small Raspberry Pi / Arduino project and I have to use some sensors. I want to detect if a mechanical plastic part on the other side of a wooden panel has moved and if ...
0
votes
2answers
63 views

Porting SPI code from (Intel) Galileo to Edison - Arduino

I'm currently working to port some Arduino sketches from Intel Galileo that use SPI (using a prototype Arduino Breakout board). I haven't been able to get it to work so far - but I have used an ...
0
votes
1answer
58 views

Measuring pulse using an EMG device

For another project I once bought the following EMG sensor kit: https://www.sparkfun.com/products/11776 Now, I would like to know if it is possible to measure the heart pulse using that EMG sensor ...
1
vote
2answers
139 views

What happens if I accidentally connect an Ethernet device to my 1-wire bus?

I have built a networked temperature sensor by connecting several DS18B20 temperature sensors to my Arduino. I've tried to visualize the setup with this schematic (sorry if this doesn't make any ...
6
votes
7answers
10k views

How to debug the arduino sketch?

I started coding for arduino very recently. And these bugs in the code are killing me. As there is no hardware debugger in the arduino, serial.print() is my only resort. Please tell me the ...
0
votes
1answer
63 views

Small low-power device-to-device proximity detector

I would like to find or create a small low-power proximity detector to tell a device when another device is near. This would be coupled to a small microcontroller like the AT-tiny 45. It doesn't ...
0
votes
2answers
56 views

Wheel speed from Shimano dyamo hub using arduino

I'm trying to figure out a way to extrapolate wheel speed from the Dynamo hub I just purchased. I outputs 6V 3W AC, and I would like to potentially measure it using an arduino if possible, I' assuming ...
1
vote
4answers
104 views

Best way to control around 250 LEDs [closed]

I have got the task of coming up with a solution of individually controlling around 250 LEDs. As I would be a complete newcomer in programming an Arduino or whatever else there is, the computing ...
0
votes
0answers
19 views

Digital pins on Arduino function as both positive and negative terminals? [migrated]

I'm learning the arduino platform and working on a circuit that connects the two pins of a piezo buzzer -- one to ground and the other to a digital pin of the arduino board. In this configuration, is ...
0
votes
0answers
61 views

Servo shaking when GSM module starts transmitting

I have a project which uses 2 Arduinos which is communicated with my phone by a GSM module, and that one of the Arduinos is driving two servos. The question or problem is that my servo is shaking ...
0
votes
0answers
53 views

I2C interfacing with ATmega32 and ArduinoMega2560 failed

I'm trying out I2C interfacing the ATmega32 with Arduino Mega2560 Board without success. The Arduino Board is configured to be the Master Read. The Atmega32 is configured to be the Slave Write. I ...
2
votes
2answers
45 views

Protecting a comparator in a tension measurement device

I am building a device to measure the tension of a conducting wire using an Arduino. The basic circuit concept consists of two stages: The wire is placed in a strong magnetic field. Then the ...
-2
votes
0answers
45 views

Creating a product with arduino bootloader [migrated]

If you have a prototype with arduino and you wish to create a real product can you do it or the fact that it contains the arduino bootloader prevents you? BTW, i dont have a product ready. I am ...
0
votes
1answer
53 views

How can I use 15 servos with arduino mega2560 without stepping down voltage?

How can I use 15 servos with arduino mega2560 without stepping down voltage? because I want to control 15 servos by one board (arduino mega 2560).
0
votes
0answers
42 views

How to power an arduino controlled thermostat

I'm slowly working on my home automation system which is controlled from a central Raspberry Pi. My current project is to control the thermostat / heating from the Pi based on time, temp, occupancy ...
0
votes
0answers
5 views

Finding arduino bootloader version? [migrated]

I have problem with WDT reset. After reset the device goes on for a boot loop. from the following link https://code.google.com/p/arduino/issues/detail?id=181 It has been mentioned that there is ...
2
votes
0answers
42 views

What mechanical parts can be attached to DYJ48 stepper motor? [migrated]

Sorry I am asking a mechanical question here, but, after all, where else people have experience with using motors? If there is a better forum for this, please do guide me. Everywhere I've seen ...
1
vote
3answers
92 views

When should I write to EEPROM?

I built a simple project using an arduino to control a I2C digital potentiometer being controlled by a remote control via a IR Detector. The purpose is to be able to control the input signal of a ...
16
votes
2answers
2k views

How do I extend the number of analog (input) pins available to me?

I already know how to extend the number of digital pins on an Arduino using a multiplexer. I want to increase the number of analog input channels that I have. One solution is to add another Arduino ...
0
votes
2answers
2k views

Programming an ATMega328 with Arduino bootloader via a FTDI USB-serial adapter

I would like your advice relating to using the Arduino IDE and avrdude to program an ATmega328 which is preloaded with an Arduino bootloader. I am using a USB to TTL-serial breakout board based on an ...
0
votes
0answers
16 views

Communicating between a computer and multiple Arduinos [migrated]

I am designing a experiment of controlling 6 small wind turbines wirelessly. For each wind turbine, I need to measure power time series (or voltage or current time series) from the generator, and ...
0
votes
0answers
23 views

Arduino Touchscreen Selection [closed]

I'm looking for a touchscreen to use for a project involving an Arduino. What are some things to look for? 7" Capacitive would be preferred. Some things I've thought of: Arduino Compatibility ...
-2
votes
1answer
44 views

Arduino Uno camera choice for image processing [closed]

I'm looking for a cheap camera that is compatible with the Arduino Uno. The goal is to mount the camera on this robot kit. It can either be a video camera or just pictures. The picture would then be ...
-1
votes
2answers
171 views

Arduino pin frequency for persistence of vision (POV) project

Arduino Uno has 4 pins that run at 960 Hz and 2 pins that run at 490 Hz. Are those frequencies fast enough that I can change the strips that lights up the LED and create the illusion that it lights ...