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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27
votes
7answers
7k views

How do I go from arduino breadboard to creating a real device

My first arduino project, I have made a headlight sensor that will activate an outside light when car headlights hit it. I know I could go buy one, but where is the fun in that? Now I would like to ...
0
votes
2answers
24 views

ACS712 to Arduino Due ADC input

I want to read the armature current of the brushed DC motor. I am using the current sensor ACS712 20A. How can I feed the output of sensor to Arduino Due analog input pin (A0) to read its digital ...
0
votes
0answers
34 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 ...
5
votes
3answers
467 views

Can I control a 12V motor from arduino using an H-bridge?

I want to control my 12 volt geared DC motor from my Arduino Uno. I want it to be able to rotate both directions as I'm intending to use it for a robot. Can I use the L293NE H-bridge in this case? ...
2
votes
1answer
166 views

MOSFET on Arduino Uno

What is wrong with this circuit? I've performed the following tests in my circuit: When I set the controller output pin PD7 to HIGH, the source/drain voltage is 0V (measured with oscilloscope). ...
0
votes
1answer
53 views

1000:5 current transformer: how to calculate burden resistor? [duplicate]

I want to calculate burden resistor for a 1000:5 current transformer. I want to output 5V variation. How do I calculate this burden resistor? I using burden resister 220orm .this is out put .input ...
1
vote
3answers
1k views

Need explanation on how to flash HEX files on ATmega32u4 via AVR109 protocol

I am not an electronic expert, so forgive me if I am misusing the terms in my question or if my question contains imprecisions and/or misinterpretation on how a Leonardo Board works. Corrections are ...
0
votes
1answer
60 views

Self-made Arduino pushbutton bank not working

So I'm trying to make a 5 key keypad like circuit, but with increased tactile feel, so I forwent actual store bought pushbuttons. I rigged up keys with some aluminum foil and pieces of plastic and ...
0
votes
0answers
11 views

ATTiny85 Interrupt id vs pin when programming with Arduino [migrated]

I am using an Arduino Uno with the Arduino as ISP sketch to program an ATtiny85. I followed this tutorial to set up to program the ATtiny, and successfully got it to run Blink and an interrupt-free ...
5
votes
1answer
587 views

Is it ok to power an Arduino Duemilanove with 15 V?

The documentation says 12V is the max tension recommended to power a Arduino Duemilanove, however the "limit" is 20V (see: http://www.arduino.cc/en/Main/ArduinoBoardDuemilanove). Will the Arduino ...
4
votes
3answers
2k views

Detect car +12V using Arduino

I am looking to detect 12+V from a car wire using an Arduino. I have found the following schematic: I know how crazy automotive voltage can get so I just want to make sure the schematic I found ...
0
votes
0answers
49 views

Uploading bootloader on ATmega328P SMT package using Arduino Uno [migrated]

I have been trying to upload bootloader on ATmega328P SMT package on a custom PCB using Arduino Uno as ISP, I was quite successful. I have Googled a lot and have tried numerous ways, sometimes I was ...
0
votes
2answers
128 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 ...
0
votes
2answers
55 views

Is it possible to power an Arduino Uno with a Raspberry Pi?

I have an Arduino Uno and a Raspberry Pi that I'm using to control some LEDs in a computer case. Power is coming from a Molex connector from the computer's PSU. I want to place the Arduino and the Pi ...
0
votes
0answers
7 views

Arduino Digitalwrite for while loop set [migrated]

My question is simple. Does Arduino set the digitalwrite() the moment it is called or at the end of the while loop. E.G. `int ledPin = 13; void setup() { pinMode(ledPin, OUTPUT); } void loop() ...
4
votes
1answer
844 views

Corrupted files generated by Arduino with SD library. How to avoid that?

I have a sketch that runs on an Arduino Ethernet (that comes with an SD card reader and, of course, an Ethernet interface). There is a unique place in this sketch where I write to a file on the SD ...
2
votes
6answers
133 views

Control a lot of IR sensors with Arduino / Build a game board tile

Is it possible to control a lot (let's assume 100) of TCRT5000 IR distance sensors with one Arduino? So just use one or a few pins but not 100? I am relativly new to the Arduino/electronics area and ...
1
vote
1answer
99 views

MIDI To Polyphonic Square Wave on Arduino

I've been struggling with this for a few days now, and I would really like to get on with my project. Unfortunately this is holding me up. What I am trying to do is retrieve MIDI signals sent over USB ...
0
votes
2answers
81 views

Can I power Ardiuno using buck converter IC 3485 or any other buck circuit?

A buck circuit lowers the voltage by generating pulses at a certain duty cycle. Is it okay to give this pulsing voltage to Arduino? Can Arduino work normally with this? I have 12V battery and I want ...
3
votes
0answers
48 views

Help reverse engineering a CRC-8 [on hold]

I have an arduino based home temperature monitoring system using Ambient Weather F007th wireless Thermo-Hygrometers as sensors. I am trying to work out the CRC and add some code to my project to ...
1
vote
2answers
175 views

Can I run matlab on a microcontroller?? and if yes which one?

I am working on a complicated robotics project which involves MATLAB image processing algorithm and LEGO MINDSTORMS interface as well as an Arduino. The system works dependently in a sequence ...
1
vote
1answer
80 views

TIVA C series launchpads for arduino programmers

I have bought a Tiva C series Launchpad TM4C1294NCPDT by TI and wish to do a project on face recognition. I will soon get a DSP EVM by TI, but still confused which one to choose (MAY be the one with ...
2
votes
1answer
607 views

Arduino clock speed prescalers at start without fuses

I know it's possible to change the clock prescaler at runtime. But is there a way to set the prescaler that is used at boot on an ATMega328? I'm aware of the fuses, but those are pretty permanent. I ...
0
votes
0answers
57 views

Why is there a voltage spike when Arduino resets?

An Arduino is powered by a AC/DC converter and reads voltage from a sensor. Why does the voltage reading spikes up really high whenever Arduino is reset? In this scenario, Arduino is used as a ...
1
vote
1answer
82 views

Arduino 433MHz transmission fails if falling edge is less than 122ms

I am trying to control a LED using a high-power 433MHz transmitter receiver pair, with transmitter connected to my Arduino Nano. Here is the transmitter (XLPCF20): ...
1
vote
2answers
89 views

How to detect whether a bathroom stall is closed?

I've got a bathroom stall with a sliding bolt and would like to detect when the door is closed and locked. I'll receive the state of the door with an Arduino Uno Not sure what's the best way to go ...
0
votes
2answers
64 views

How can I flash an AVR using an Arduino without using Arduino IDE?

I want to program an ATTiny microcontroller using an Arduino Uno board via AVRdude. According to the Arduino Uno schematic, there is a direct line from the USB controller to the ICSP1 header: I ...
0
votes
3answers
649 views

Arduino UNO R3. IDE Error-Not in sync. TX shorted to 5v?

I have (had?) an Arduino UNO Rev 3. While uploading sketches Arduino IDE reports this error avrdude: stk500_getsync(): not in sync: resp=0x00 I'm not sure when or why it stopped working. It would ...
0
votes
5answers
102 views

Can a proximity sensor read through fabric?

I am trying to build an arduino project with the following requirements: Proximity sensors detect human presence and its distance The sensors are hidden behind fabric Range has to be 1-3 meters or ...
0
votes
1answer
152 views

How can I power this LED Matrix?

I'm controlling a 16x32 LED matrix with an Arduino and have it wired correctly (I think) but I'm having trouble with the power. I tried to follow the instructions from Adafruit but was unsuccessful in ...
-1
votes
1answer
61 views

Sharing the Seeeduino LiPo with a motor controller

I'd like to use a Seeeduino to control a small DC motor to wind/unwind a thin cable which will be lifting a small door. Ideally, I'd like to use the same LiPo that's being used to power the ...
3
votes
2answers
673 views

Reverse-engineering RF packets

I have a Blue Line Innovations PowerCost Monitor. It sends packets to a display unit over a 433.92 MHz RF link. There is code (Power Monitor, incomplete) to detect these packets with a RF Link 4800bps ...
2
votes
2answers
76 views

Interfacing incompletely documented logic signal where resistor affects output voltage level

So I've got this marginally documented 12V logic signal from something I have to regard as a black box that I'd like to interface to a pi or arduino (i.e. c 3V). I have 3 lines - 0V, +12V and signal ...
0
votes
2answers
101 views

Long range Arduino communication

The project must be able to detect the amount of water in tanks and transmit the information to a farm house it must be wireless and unfortunately there is no cell phone reception in the places that ...
0
votes
2answers
74 views

A simple device to remotely alert someone [closed]

We are developing a solution that can remotely alert someone around a relatively small area (around 300 meters). Each user will carry a sort of pager. The server will send an alert to the device. The ...
0
votes
1answer
86 views

HC-06 Bluetooth module not responding to any AT commands

I am trying to interface with a HC-06 module but I can't talk to the module over serial. My VCC is connected to 5V (also tried 3.3V) of my Arduino Uno, and GND is connected to ground of it ...
0
votes
2answers
65 views

How do you power 6 servos

I have 6 MG996 series servomotors. A single motor can be controlled by an Arduino board using a 5V power supply. Some specifications Running Current 500mA - 900mA @ 6V Stall Current 2.5A @ 6V ...
-2
votes
0answers
65 views

Run Arduino with battery [closed]

I'm doing a program to calculate velocity and distance using accelerometer. I already completed the program. I want to carry the board around using battery to run the board. I would like to set a ...
3
votes
1answer
225 views

What are the contact pads near the ATmega32 chip on the Arduino Yun?

What are/What use have these pads near the ATmega chip? I thought they are used for testing or something else, they seems to expose the ATmega traces directly. Maybe they can be useful to connect ...
0
votes
0answers
7 views

Arduino Custom Function Problem [migrated]

I am experiencing problems when I put parts of my code into custom functions and then have Arduino Mega 2560 run it. The code works fine when I put it all in the void loop() function, but when I ...
1
vote
3answers
369 views

LED burned on Arduino

I connected a green LED to pin 13 and digital GND on Arduino Uno R3. pinMode was set to ...
0
votes
1answer
44 views

Control relay from Bluetooth on ATtiny85

I know someone else has made a Bluetooth transmitter to a relay so i wanted to ask a few questions about it being possible? I am an almost newbie at electronics but i do know a few things, so first of ...
4
votes
1answer
63 views

How many AVR's on an Arduino Leonardo?

What is going on here? According to the circuit diagram there are two microcontrollers (U1 and U2, with slightly different partnumbers) on the Arduino Leonardo, but when I take a look at the PCB I can ...
0
votes
3answers
64 views

Switch between two digital signals with no microcontroller

I'd like to use an Arduino to send wirelessy (RF 433MHz, probably) two different digital signals to pilot two different relays (later they will be much more). I know probably this is something very ...
-1
votes
1answer
92 views

Arduino Bluetooth BLE boards function as iBeacon emitters, or receivers?

I have just purchased the estimate iBeacon developer kit and am doing research on iBeacons, building demo apps using Adobe AIR with native extensions. I was curious if any of the many Bluetooth BLE ...
2
votes
1answer
154 views

Low frequency sinus generator

I would like to build a sinus frequency generator that can be controlled via an Arduino. Sinus frequency would be in the low frequency regime (below 100 Hz) with a voltage around 2.5 Volts peak to ...
1
vote
1answer
26 views

Why can't I read the 328p from an Arduino board using USBasp?

I have been using a USBasp board and avrdude to successfully program Attiny13 chips. I thought I'd have a look at the chip from my Arduino (ATMega328p), but avrdude can't seem to read the chip. ...
13
votes
2answers
2k views

Low power micro-SD card storage

We are building a low-power data logger based upon the ATmega328P, in order to make use of the Arduino boot loader and IDE, etc. Ideally power consumption should be less than 0.3mA @ 3.3V to get ...
1
vote
1answer
264 views

XBee Coordinator API not receiving data from Router AT pin 20

A Xbee Series 2 in Router AT configuration with a potentiometer wiper output connected to XBee's pin 20 AD0 is supposed to send the analog data every 100 ms. It was ...
1
vote
1answer
27 views

Specs of HK-TR6A remote controller receiver

I'm trying to use a 2.4 GHz digital 6 channel remote controller to send signals to an Arduino UNO R3 board. The receiver is the HK-TR6A-V2. I can't find any information on what each pin input/output ...