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.
4
votes
1answer
90 views
How do I connect a signal shield to minimise noise from close proximity AC
In my proposed application, I will have approximately 30 RS-485 nodes configured in 3 chains spaced ~1m apart. There is a need to pass through 240v L-N-E, +5v, A, B, GND in each node. The physical ...
1
vote
1answer
240 views
Arduino with Parallax RFID reader storing variables in char
I am quite new to electronics and have been tinkering around with this Arduino UNO w/ WiFi Shield and the Parallax RFID R/W Module.
Link to the RFID Module: ...
1
vote
1answer
57 views
Multiplexing AVR (ATMega328) PWM within Interrupts
I'm trying to take 3 common anode RGB LEDs and hook up the cathodes of each to three of the PWM outputs on an ATMega328p and then in an ISR, multiplex between them all. The problem I'm running into ...
1
vote
1answer
178 views
Unable to upload arduino sketch to Uno using AVR ISP MKII and Ubuntu 12.04
About a week ago, I tried to use my Arduino Uno to program a a standalone atmega328p with optiboot. Not only was I unsuccessful, but now I can't upload sketches to the original atmega chip. The "L" ...
1
vote
1answer
49 views
How to connect ASD bios chip
In my little box full of various electronic components I've found an AMIBIOS chip from 1995. The actual chip data are the following:
Vendor: ASD
Number: AE29F2008-12
Another number: 9846
I want to ...
0
votes
0answers
69 views
Reversing polarity for electromagnets
I'm fairly new to electronics - software engineer by trade. I get the basic parts, but have no experience with circuit design or such.
I picked up a neat WWII era wind speed and direction gauge set ...
2
votes
2answers
358 views
Arduino Motor Shield for 12v stepper motor
new to the forums here!
I'm making a basic rig for timelapse photography using arduino.
It is a panning system for a DSLR camera, so I went with the motor shield from Arduino with the L298 chip and ...
2
votes
0answers
38 views
Isolation between cells for battery charging & testing
I want to charge Lipo battery packs and possibly other chemistries too. Six cell packs for starters. But hope to handle more and less. Perhaps a lot more cells. For electric vehicles, skateboards, ...
1
vote
2answers
42 views
Error when compiling “Does not name a type”
I want to inherit my own class from LiquidCrystal that creates some custom characters during initialization. Here's the code I've written so far:
MyProject.ino
...
4
votes
1answer
87 views
Vinyl player emulation on Arduino
Say, you have an arduino uno + audio shield, a speaker and a jog-wheel (or mouse scroll-wheel).
And you want to play some audio-file tied to the movement of the wheel, just like you move vinyl disc.
...
0
votes
0answers
39 views
Senior project using RFID technology - is this feasible?
The project is to implement object localization using RFID technology. The idea is to have objects tagged with RFID tags and have one (or several) readers that will locate the objects' position. The ...
0
votes
1answer
29 views
xbee and interoperability
i'm studying interoperability in the telecommunication field and i want to know we must do what to have an xbee module interoperable with other zigbee devices of other manufacturers (not Digi). I ...
1
vote
0answers
21 views
mbed vs Teensy 3 vs other options
I'm an electrical/electronic technician, I'm good with analog electrical stuff & electronics, but when it comes to microcontrollers, programming & uA, stuff start to sound Chinese to me (no ...
1
vote
2answers
20 views
How to add additional sensor module on Arduino
I have tried the GY-521 sensor on Arduino by using the guide from (http://playground.arduino.cc/Main/MPU-6050). It worked well. Can anyone guide me on how can I add another GY-512 module please? I am ...
2
votes
1answer
81 views
Short-cut when using SN75441 h-bridge (with an Arduino)
I'm trying to control 6 bi-directional motors using an Arduino to feed an SN75441.
In order to minimise the number of wires between the two I'd like to tie the Motor Enable pins (1 & 9) to Vcc1 ...
2
votes
1answer
67 views
Learning how my circuit works (PWM a 5V USB fan)
I'm new at electronics (my new hobby) and got a lot of good responds from you guys so hope you can help me out with this one as well.
I got this an USB fan that I wanted to modulate by controlling it ...
2
votes
3answers
79 views
Understanding short circuits (in Arduino) and identifying electronic devices
I'm a programmer and I recently purchased an Arduino Uno and I've very scared to short circuit it. I've been playing with http://www.falstad.com/circuit/ and have been able to create a few LED ...
6
votes
6answers
4k views
How can I detect if a garage door is opened or closed?
The Problem:
I want to be able to detect if a garage door is opened or closed with my Arduino. I don't know what kind of sensor would be suitable for this task. The Arduino and the unknown sensor ...
0
votes
2answers
92 views
Arduino Time.h - Resets on Serial Connection for Sync
I realize and understand the problem with arduino boards resetting whenever you open a serial connection as stated and answered here.
However, because of that I'm trying to figure out how various ...
0
votes
0answers
20 views
not receiving signal when RedBoard is using XBee shield
I'm running into a problem with a SparkFun XBee Shield (WRL-10854) when used with a RedBoard (DEV-10908) (Arduino Uno compatible) where it doesn't receive the signal being sent to it. When the same ...
2
votes
1answer
33 views
Does the system COM port baud setting matter for Arduino?
I have a custom arduino board that is basically like any ATMega328P based setup. I'm using the FTDI friend from Adafruit to communicate with it and when the drivers for it are installed you can see in ...
1
vote
2answers
88 views
Using 2 xbees Series 2 and arduinos
I have 2 xbee series 2s that I want to talk to each other with ardunios. I have the ardunio xbee shields but I can't find any good resources on how to get them to communicate together. So how would I ...
8
votes
1answer
102 views
What are these spots on the PCB that are by the mounting holes?
When you look at the board, there is a weird part of the PCB right of the top left mounting hole. There is also another one above the top right mounting hole.
...
5
votes
3answers
114 views
Solenoids causing Arduino to malfunction despite protection diode
simulate this circuit – Schematic created using CircuitLab
I have an Arduino Mega that I'm attempting to control some solenoids and LEDs with.
The LEDs are 3.3V, controlled through an ...
13
votes
2answers
119 views
Why do some pins have `~` signs next to their numbers?
I was looking at my Arduino Uno and I noticed that symbol by digital pins 11, 10, 9, ...
3
votes
1answer
116 views
Common cathode RGB LED Cube: Can/should it be done?
I'm planning to build a 8x8x8 RGB LED cube run by an Arduino Uno. This is my first electronic project since highschool ~ 20 years ago so I'm more than a little hazy on the subject and may be making ...
0
votes
2answers
92 views
4
votes
2answers
111 views
What do I need to do to use a R3 Ethernet shield with a R3 Arduino Mega 2560?
I want to use my newly bought Ethernet shield without making any hardware changes, buying anything, and (preferably) add no extra jumper wires. However, it doesn't connect to ...
5
votes
2answers
40 views
How can I control things without using delay?
I have always hated that you couldn't do other things while you used the delay(); function. However, I want to blink a LED or do whatever while using serial, but ...
1
vote
2answers
282 views
Arduino Nano v3 atmega 328p avrdude: stk500_getsync(): not in sync: resp=0x00
i get this error:
avrdude: stk500_getsync(): not in sync: resp=0x00
when trying to upload a example sketch.
pin (0,1) are not occupied;
it is the right serial ...
0
votes
1answer
50 views
Problem with Arduino and 2 Sharp IR sensors
I have 1 Arduino and 2 IR Sharp GP2Y0A02YK0F proximity sensors, I connected 1 sensor, with mounted capacitors between GND and VCC (100nf, 10000nf)
Everything is fine, I have good values, but when I ...
3
votes
5answers
2k views
Reducing the sensitivity of a PIR sensor?
I have several of these PIR sensors.
I am hoping there might be a way to reduce range/sensitivity to a very small field. Currently they are detecting motion about 15-20 feet away.
Does anyone know ...
1
vote
2answers
86 views
Why 74hc595 keep my light always on
I have a serial to parallel chip ( 74HC595-N ) which work well when I run the arduino script made for it. ( the current wiring work perfectly when I send data through the data pin )
But then I ...
0
votes
1answer
134 views
Using Arduino Uno to Log GSM Air Interface Messages
Is it possible to log the GSM Air interface messages that are sent between a GSM Module and the GSM/WCMDA network using an Arduino Uno?
Basically, I want to log/record all the GSM messages of the Air ...
0
votes
0answers
72 views
Is there a very precise location transmitter? [closed]
I am looking for a very small (not larger than 4x4 inches) device that can roam around on its own on a flat surface and transmit its location and elevation (precise to the millimeter). It can be of ...
1
vote
2answers
70 views
Servo not working with Arduino
I've connected a servo(AS-18 acoms) to my arduino and I've uploaded the sweep example onto it. But nothing happens . Here's a pic.
I've connected the positive terminal of the servo to 5V on the ...
0
votes
1answer
39 views
Saving user input as an array and recalling it later
I am currently working with an Arduino Mega and a SainSmart LCD and I have gotten most of my project to work except for a problem I am currently having.
On my LCD screen, I have various buttons, and ...
1
vote
2answers
330 views
Regarding Arduino Uno - Counter
I am new to Arduino so, bear with me. I am trying to make a project for a counter countdown using my Arduino Uno whereby any of the 1 out of 14 pushbutton has been pressed, it decreases a digit number ...
0
votes
1answer
82 views
Help with this “Make” tutorial
I'm a software guy and am dabbling a bit with arduino recently. I don't understand many things when it comes to taking a circuit board schematic and doing it in real life.
For instance, at this ...
0
votes
0answers
24 views
Xbee series 2 trying to communicate in API mode
i am still trying to get this xbee module to work in API mode but with no success so far. So, instead of trying to make the both radios work at the same time i am just using coordinator for now. I ...
2
votes
2answers
85 views
How to use electrically isolated weak signal for Arduino interrupt?
I'm trying to use the signal generator from a DSO Nano v2 to drive an Arduino interrupt for testing purposes. I have measured the output of the signal generator at approximately 13mA @ 2V DC.
I have ...
1
vote
1answer
37 views
Multiplex 125kHz RFID antenna
I'm looking to follow up on a question (asked by another) that wasn't answered to my satisfaction in another question.
RFID Antenna Array
I am successfully using the ID Innovations ID-2 chip to read ...
2
votes
2answers
223 views
Is there any way to connect 20-25V 1MHz digital input to arduino?
I need to connect 20-25Volts 1MHz digital input to Arduino. Are there any possible ways to do it? I think, using optocoupler will be useless because of high frequency. Any other ways to solve it?
0
votes
0answers
38 views
How to upload sketch of Arduino “Leonardo” from PC through Bluetooth?
I try to upload my sketch from PC (Dell Inspiron.1525, XP pack 3) to Arduino Leonardo by the Bluetooth but it is not work, I try all ways that found in Internet which most of them about Arduino Uno, ...
5
votes
2answers
2k views
Debugging a 16x2 LCD Display on an Arduino
I have a standard 16x2 LCD display (I believe it is Hitachi HD44780 compatible - see summary and specification below), hooked to an Arduino Uno using 4 data pins, as described here, though I've added ...
0
votes
1answer
71 views
How to design a non inverting op amp adder for my circuit?
I am trying to implement an adder for my circuit using 4 resistors.
From what i read, i understood that so long as you have R1 = R2 and
R3 = R4 it really does not matter what value you use. The ...
2
votes
1answer
110 views
Read and decode .led file
I'm working on a flexible LED screen persisting of 20 meters of digital RGB LED strip with WS2811 IC for each LED.
I want to control this using Arduino, which isn't a problem using FastSPI. My ...
2
votes
2answers
3k views
Arduino Uno SoftwareSerial and Serial conflict
I have a very simple setup with an Arduino Uno R3 connected to my Windows 7 x64 with Arduino 1.0.1.
I have a RF receiver connected to the Arduino on the DI10 port using the SoftwareSerial library. I ...
1
vote
2answers
154 views
Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino?
I currently have an anode RGB connected to the 11, 10, & 9 PWM pins on my arduino. However I would like to add 3 more LED's to my project, but I don't want to necessarily take up every single PWM ...
1
vote
1answer
50 views
xbee api mode help!
I am not sure if this is a right place to put this question but if anyone is familiar with xbee and can help me with this problem, i highly appreciate your help.
I have two xbees one configured as ...
