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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2k views

Arduino LCD not working

I'm getting started with LCD projects for Arduino, but for some reason, the LCD won't display characters. I'm using this tutorial from the Arduino website, and this LCD with an Uno R3 board. This is ...
0
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1answer
50 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 ...
1
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0answers
53 views

As a beginner, how can I learn about basic interfacing? [on hold]

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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1answer
62 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 ...
0
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1answer
74 views

2.4 GHz versus 434 MHz transceiver for home automation

I am working on a project that uses an Arduino Uno R3 and will have one receiver and one transmitter. I'm going to use this for home automation within my home in India. I want to know which ...
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4answers
380 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 ...
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2answers
50 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 ...
8
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5answers
1k views

Accurately measuring temperature with Arduino

I'm trying to build thermostat with Arduino. I want to power it using mobile phone battery/charger which makes system voltage quite variable. Right now I use Arduino Uno, but once it is complete I ...
1
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2answers
489 views

Single and Double Click on Arduino Multiplexed Buttons

On my arduino project i have 8 buttons connected to a 4051 Multiplexer. I would however like to add single and double click funcionalities to each of these buttons, but i can't find a way to do it. ...
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2answers
57 views

Slow down stepper motor's speed using stepper driver DRV 8825

I've got a Nema 17, rated at 0.8Amps, stepping angle of 1.8 degrees. The motor looks like this, and has six wires coming out of it: The four wires I've used are the ones labeled below (I was ...
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1answer
171 views

Not getting data from Parallax GPS

I am trying to use a Parallax PMB-648 GPS with an Arduino Nano running this code: ...
1
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2answers
9k views

How to have an Arduino wait until it receives data over serial?

So I've wired up a little robot with a sound shield and some sensors. I'm trying to write a sketch that will let check the sensors. What I'd like for it to do is print out a little menu over serial, ...
0
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1answer
70 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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1answer
52 views

125kHz RFID output interpretation

I'm using the RDM6300 125kHz reader module in combination with Arduino Uno to read my tags. The tags themselves have their ID as a label. When I then try to read the cards, I receive another ID as ...
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0answers
39 views

How to replace all the arduino shields with just one [on hold]

I came to know about a shield named 1shield by which we can use our android phone as many shields like g-sensor, GSM and etc. So this product is not available in my country and, can I replicate it ...
4
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1answer
572 views

Reversing direction of a 115v ac motor using Arduino

I have a 115V brushed motor that I am controlling via Arduino. The manufacturer says it draws 1A but I'm not sure if that accounts for the initial current draw to turn it on. I've had great ease and ...
0
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1answer
52 views

Use Arduino to Plot the balance of my airplane propeller using optical sensor and reflective tape

I would like to use an arduino to determine how out of balance my airplane propeller is. I've seen a production device that uses an optical sensor and reflective tape to plot this. Can this be done ...
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0answers
43 views

gamecube controller emulated by arduino [on hold]

So for a project I want to create a GameCube controller using an arduino. I have found a few websites that have the GameCube controllers protocol, but how would I go about coding the arduino to send ...
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0answers
28 views

How to drive ten sevos with an Arduino Due board [on hold]

I want to drive ten servos with an Arduino Due board. Can you guys help me with the code? It should: Ask to enter ten values ranging from 0-180 and 3 bits per servo. Save the value of all ten ...
3
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4answers
532 views

Decoupling capacitor across Raspberry Pi GPIO input (+ Arduino + robotics)

I've been messing around with a robot kit from Parallax (the BOE Shield Kit), which has a 5xAA (7.2 V?) power source. The BOE shield includes its own 5 V regulator, which is used to control ...
2
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2answers
120 views

Reverse engineering old serial devices and cloning with Arduino

I guess this is a strange topic and might not be one anyone here could give any advice on but here goes... I have a piece of music equipment that uses a remote control. This remote control ...
0
votes
1answer
77 views

Powering circuit and Arduino with single power source

I am trying to power an Arduino Uno as well as my circuit using Li-Ion batteries. They are 2 18650 Lithium Ion batteries (rated at 3.4 V each = 7.4 V total). I have this battery plugged into the Vin ...
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1answer
269 views

How to make a PowerSwitch Tail

I have an arduino board, and I would to turn a different, completely isolated circuit, on and off. Actually, I will be running 230V to another device, and then control whether it is on or off, with ...
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2answers
161 views

Differential analog signal conversion using Arduino Uno

I need to perform a A/D conversion for a differential signal using Arduino Uno. I have tried a software method where I connect one input to A0 and another to A1, read ADC for both channels and then ...
0
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1answer
79 views

Two arduino unit communication

OK plain and simple I'm not sure to use IR or RF. This is short distance up to maybe 10 ft. I have an Arduino Uno that I have all set up here. I press a button and it carries out its code. This is ...
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3answers
120 views

Sending signals to PC over wifi

I need a microcontroller that would send statuses of it's input pins (around 5 of them, they can be 0 or 1) to a PC over wifi. I thought of using arduino, but I don't know what would I need to make ...
18
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3answers
2k views

Why do Arduinos ship w/ 16MHz crystal instead of 20MHz?

Why do Arduino boards ship w/ 16MHz crystal instead of 20MHz? They are spec'ed for operating at 20MHz, after all. I guess there are a few advantages to running more slowly (lower power consumption, ...
0
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1answer
42 views

How to get 32u4 arduino to ignore DTR for USB Serial?

32u4 based "USB Serial Ports" refuse to send data to the PC unless DTR on the PC software side is set to high. If the PC software does not set DTR to true (high?), then Serial.print() on Arduino goes ...
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2answers
85 views

How to replace the rectangle(DIP) bridge rectifier with round one.

I want to make an AC dimmer and the circuit diagram from the instructables uses a bridge rectifier which is in DIP package and rectangle in shape and the rectifier which I have is round one, so how ...
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2answers
92 views

Does a circuit going into an Arduino pin/GND need a resistor? [closed]

If a circuit goes into an Arduino pin, even the GND pin, but does not use something a component that needs a resistor such as an LED, does it still need a resistor for the Arduino pin? Edit: To clear ...
0
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0answers
19 views

WS-RX-02 Receiver Range in Arduino

I have been preparing the receiver using WS-RX-02 receiver and arduino Uno R3 board. My connections are as follows. 3 GND PINS on RECEIVE UNITS are Connected to GND of ARDUINO 2 VCC PINS on RECEIVER ...
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votes
3answers
43 views

Maximum cable length for 5V or 3.3V I2C, UART, or 1-wire signals over Ethernet and how to increase it?

I know similar questions have been asked before (Maximum cable length for 3.3V UART signals) but I would like to know the answer more specifically for a hobbyist. I've been experimenting connecting ...
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0answers
30 views

12V/ 10A+ Arduino motor controller [closed]

I have two linear actuators rated at 12V and max 5A (per actuator). I am looking for a dual channel motor controller that can drive these two actuators with an Arduino. Any suggestion regarding a ...
25
votes
7answers
24k views

How can a let my atmega328 run for a year on batteries?

Scenario I have created a nice electronic door lock for my dorm room. It is currently an Arduino Diecimila with a servo [un]locking the door. It has a numerical keypad with 3x4 buttons and 5 LED's (2 ...
1
vote
1answer
60 views

Possible to charge a LiPo battery with a 3.5mm headphone cable but also send/receive data?

If I have a device (Device A) that is plugged into a 120v wall outlet, and is connected to another device (Device B), that has a small LiPo battery, via a 3.5mm headphone cable (consider this a ...
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0answers
32 views

Making a wifi / bluetooth Glove Controler

I want to make a glove (or something like a glove) that would send a signal to a laptop / smartphone when I touch my fingers and thumb. I heard I could connect arduio with a wifi module, but not sure ...
0
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1answer
24 views

XBee Power Consumption, RX Current and TX Peak Current

I'm trying to find out the max power consumption for an XBee Series 2 2mW module so as to pick out a suitable power supply for the system. The docs state that it has a TX Peak Current of 40 mA and RX ...
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2answers
1k views

Arduino: why does simple include not work

Hello in my arduino code i simple want to include another file like this: #include "letters.h" but it says ...
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0answers
62 views

How to use a microcontroller as a switch [closed]

I basically want the microcontroller to switch different circuits on, one at a time. How can I achieve this?
0
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2answers
145 views

Cascading PID DC Motor Position & Velocity Controllers

I'm trying to build a robot with a differential drive powered by two DC motors. First I implemented a PID Controller to control the velocity of each motor independently. Estimated the TF using the ...
0
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0answers
51 views

Cloning a rfid tag with arduino

My school uses RFID tags to turn on air conditioners and only professors have it. This is to prevent students leaving the air conditioners turned on. I've been thinking about cloning a tag just to ...
-1
votes
1answer
61 views

Interfacing PT-100 Temperature sensor with Arduino? [closed]

i need to measure the temperature of oil which is in the range of 0-80appx.so i am using a pt100 to measure that.All i need to know is "how to interface the pt100(2wire) with arduino and get the ...
0
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0answers
22 views

Useing RC Switch Library for Transmitter and receiver in arduino

I have a RF remote and want to replace this with Arduino using RC Switch library. I want to sniff the codes from existing remote and send using RC Switch library in arduino. Is there any tool ...
1
vote
1answer
80 views

How do I replace an existing servo with a geared DC motor?

I am a complete beginner, just getting into the world of electronics, in particular robotics. I have found a really nice open source set up that I want to build on and change for my own ends. The ...
0
votes
1answer
62 views

Transistor Isn't Forming the Connection

I have wired the following diagram. simulate this circuit – Schematic created using CircuitLab My understanding of transistors is relatively poor, and thus I am assuming it has to do ...
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0answers
34 views

How to create (static?) electricity? [duplicate]

First off, sorry if this isn't the right place for this, but I am hoping electrical engineering is the right direction with this.. Long story short, I have a servo motor connected to an arduino board ...
1
vote
1answer
121 views

Arduino crashes switching 230V relay OFF

Here is my circuit schematic : I need to power ON/OFF a 230VAC fan using a relay. The relay is powered by a 5V DC power supply. Digital pin on the Arduino board open or close the circuit in PNP as ...
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votes
2answers
44 views

Sensors with microcontroler and RF [closed]

I am working on home automation project. I need to design the sensors which can communicate with my Arduino receiver over RF. One of the options I have is to use the sensor along with Arduino and RF ...
1
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2answers
90 views

How do I control several individual LEDs with Arduino?

I am working in a book store and I have the task of making an indication of a book place in the Library Cupboard with LEDs. I need to control about 300 LEDs with Arduino. What is the optimum way to do ...