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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12 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 ...
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1answer
25 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 ...
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3answers
50 views
Best way to control around 250 LEDs
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 ...
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1answer
33 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 ...
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0answers
36 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 ...
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1answer
43 views
Creating a product with arduino bootloader
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 ...
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1answer
51 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).
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0answers
34 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 ...
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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
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0answers
41 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 ...
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3answers
84 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 ...
2
votes
2answers
72 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 ...
2
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2answers
37 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 ...
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0answers
51 views
Using an Arduino for learning embedded C programming [on hold]
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 ...
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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 ...
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0answers
20 views
Arduino Touchscreen Selection [on hold]
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
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1answer
35 views
Arduino Uno camera choice for image processing [on hold]
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 ...
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0answers
59 views
How can I measure a weight on Ice cream tray using a sensor?
I want to measure how much weight is there on a ice cream tray inside a refrigerator.What sensor can I use to measure the weight using the sensor with arduino?
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0answers
11 views
Two 300RPM 12V DC motors connected to arduino motor shield r3 power supply [migrated]
I have two 300RPM 12V DC motors connected to arduino motor shield r3 that is mounted on arduino uno board.
Problem is my motors runs very slow some times not even running.
After googling I found I ...
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0answers
33 views
Variable Performance in DC Motor, Arduino, and L293D?
I have a pretty typical set up with an Arduino, a simple DC motor, and an L293D breakout board. I am using PWM to control the speed of the motor into the L293D enable pin. The DC motor is driving a ...
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1answer
80 views
Connecting a parallel port to an Arduino
This is my first Arduino project and while I remember a (tiny) bit of electronics from school I'm struggling to get this working - in fact I've just fried a parallel port PCI card!
I'm looking to ...
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0answers
35 views
Interface WCS2702 Hall-effect current sensor with Arduino
I am planning to use below current sensor WCS2702 (0~2A) rated measuring circuit. Since its sensitivity is very low. How to make detect by Arduino analog pin? Or how can I convert the low voltage to ...
2
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1answer
60 views
How to connect multiple of the same device to an Arduino using I2C?
I want to use two of the same magnetometer (HMC5883L) with my Arduino, but I cannot figure the code for calling each of them separately.
I have read online that connecting multiple devices is ...
2
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4answers
143 views
Current sensor measuring circuit
I am planning to design Rshunt basis current measuring. My current measuring range is 1A~2A. I need analog output of 0~5V analog with 1% accuracy. How can I do this?
I found conversion circuit here. ...
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1answer
55 views
Custom built 16x32 (40) LED Matrix controlled by Arduino
I am planning to build a clock / thermometer / info display. I have ordered 10 pieces of 8x8 LED matrixes from ebay (http://www.ebay.co.uk/itm/331064583297).
As this is not a pre-built one I have got ...
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0answers
60 views
Unable to keep 2nd shift register in chain of 3 from “leaking”
I am working on a word clock, and I am using 3 shift regsiters (CD4094BE) and 3 darlington transistor arrays (ULN2003A) to control whether or not 21 different words are on or off. The words consist of ...
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0answers
35 views
AM2302 sensor unstable during long run
I'm using AM2302 in weather station that works continuously. After ~1-2 days sensor begins to return NaN, not readings.
I'm did some investigation and it is not firmware issue (soft reset without ...
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0answers
44 views
Arduino won't connect to Internet
I recently bought an Arduino Ethernet shield which I want to use with my Arduino Duemilanove ATmega 328. I connected my ethernet shield with my Arduino board and connect shield with my router using ...
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0answers
15 views
Using RFM69W with Arduino Uno R3 [migrated]
I am quite new to Arduino and have been trying to build a home automation for my home.
I want to know if anyone has used RFM69W with arduino Uno R3 successfully. After browsing through the various ...
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0answers
38 views
what relay switch to use to control a 1500W 120V 12.5A heating element? [closed]
I am trying to switch ON and OFF a 1500W camco heating element powered by a 120V GFCI outlet using an Arduino Uno (5V DC). The heating element is being used to heat upto 5 gal of water in a kettle. Is ...
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1answer
68 views
Homemade Brushless ESC
I am currently working on building a quadcopter with brushless motors. I decided to try to build the ESCs by myself with some MOSFETs. I am using an Uno as the main controller on the receiving end. ...
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1answer
37 views
Cannot get the “Output Axis” to work
I have a Virtuabotix MMA7361 Three Axis Accelerometer Module that I am trying to use to detect tilt. It works, but only for two axes at a time. It doesn't matter which way I try to flip or turn the ...
4
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2answers
96 views
Operating an ATmega328P-PU at 2.5V
For my job, I was tasked with creating a board to interface with a 2.5V device we've made. So, to keep things simple, I decided to interface it with an ATmega328P-PU running the Arduino firmware at ...
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0answers
10 views
Switching from Arducopter to Ardupilot [migrated]
I've been playing with my APM 2.6 and wondered, for future projects, if it's possible to write code that allows me to switch from copter to rover mode (and back) while in the field. Is this possible? ...
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0answers
71 views
Light Seeker . . . . . . . . . . . . . . [closed]
i need help with the following project:
For the second project you are going to make a Light Seeker.
This will work by attaching an LDR to the stepper motor.
The system must be started by the push of ...
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1answer
35 views
Read strings from ATmega or Arduino
I have found out that one can disassemble an ATmega with objdump or avrdude. And if the LB1 and LB2 bits are set low it would be much harder. So if these bits are set high or just reading the flash is ...
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0answers
62 views
Relays and Determining the State of the Relay
This is a set-up for switching our relay and determining the state of the relay. The problem is that if multiple loads (2 or more) are already connected in parallel, the load (which is a light bulb) ...
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0answers
44 views
Over voltage on Arduino and Ardumoto [migrated]
I am using Arduino Leonardo and Ardumoto to drive 2 12v motors running at 1.3 amps each.
I purchased a rechargeable battery of 12V with 5AH
I first started by plugging in the battery to the Arduino ...
0
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1answer
23 views
Set LB1 and LB2 low on Arduino and ATmega
I have searched for a possibility to objdump microcontrollers. I then have found this post. There it says that LB1 and LB2 can be set to low to prevent the most people to read from it.
My questions ...
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0answers
52 views
Remote control of audio equipment over RS-232 with Arduino
These questions are following on from my previous question Reverse engineering old serial devices and cloning with Arduino about the monitoring of RS-232 traffic.
I had some good success and now have ...
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1answer
57 views
Create large Arduino powered LED sign
For a project, I need to create a large display (most likely an LED matrix) that can be controlled via Arduino. Large means probably somewhere in the neighborhood of 3' by 10". I intend to use an ...
-2
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0answers
33 views
Prototyping Board to collect GPS data and Connect to internet using cellular network [closed]
I am new to prototyping products like the arduino. I am working on a project and I wanna know what could be the cheapest way to implement that.
I want to collect location information from GPS and send ...
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2answers
108 views
Build variable resistor controlled by Arduino
I would like to build a variable resistor that can be controlled by Arduino. My plan is to vary resistance between the two values, i.e., 1 ohm to 10ohm, to continuously change the load for a small ...
1
vote
1answer
97 views
Writing to SD Card cheaply
So, here's the scenario:
I have an Arduino and an SD card. Unfortunately, I don't have one of the fancy shields, and I don't have the time to order one. As we know, Arduinos run on 5V, and SD cards ...
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0answers
58 views
ST7565 LCD wiring with Arduino
I have this SPI 128x64 COG LCD display which uses ST7565 for its controller. After some searching, I found that a tutorial at ladyada.net.
So with the "schema" from Digole and the information from ...
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1answer
89 views
Daisy Chaining ADC Sensors
I'm creating a grid of 200+ pressure sensors and need a clean way to get their values back to the master controller without a mess of wires.
To me it seems like daisy chaining all the sensors ...
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0answers
74 views
As a beginner, how can I learn about basic interfacing? [closed]
I have a good background in programming (C, C++, Arduino, Python, Objective-C), and am majoring in electronics engineering. We have been taught about Digital Logic, Basic Microcontrollers (8051 - ...
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4answers
416 views
How many volts can a 1 Watt 8 ohm speaker take?
I am working on an Arduino project and the sound is too low because the output pins on my Arduino UNO is only 40 mA. I can hook up an NPN transistor to amplify the sound, but I don't want to blow the ...
1
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2answers
54 views
Which resistor watt rating to use for this circuit and Arduino 5V?
http://www.skillbank.co.uk/arduino/measure.htm
I am looking to build the circuit this guy recommends for making a better analog reference source. I found the voltage reference diode, and now I am ...
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1answer
72 views
ATmega 328P SMD version
Currently I am using the normal ATmega328P chip with my barebone Arduino I have made.
I am planning to switch it with an SMD version of ATmega328P, since it's smaller in size it will consume less ...
