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2
votes
2answers
96 views

Make Arduino and 89C52 talk to each other

I am trying to create a project in which I am required to make Arduino and Atmel 89C52 talk to each other. I know this can be achieved via UART but the problem is my Arduino is already using its ...
0
votes
0answers
8 views

NRF24L01+ PA not working with Arduino Mega (works with Nano)

Full disclosure: I'm a newbie. I've got an Arduino Nano and a Mega, and a pair of NRF24L01+ PA modules (exactly these: http://www.elektrotedarik.com/Images/Urun/11122013173429.jpeg) I'm trying to ...
1
vote
1answer
122 views

ATTiny IR receiver logging erratic values, but works consitently on Arduino Uno

I am making a an ATTiny85 IR receiver, programmed with an Arduino Uno. I'm using a modified version of this code (because the other IR libraries I found weren't compatible). It's working... sort of. ...
0
votes
0answers
5 views

Simple Arduino - 74hc165 shift register construction [tmli5] [migrated]

I'm quite new to Arduino world and I'm trying to understand how shift registers work. I built this construction : .. In fact, it is an Arduino Duemilanove with AtMega on it, but afaik it doesn't ...
2
votes
1answer
60 views

How to trigger several cameras from a microcontroller

I have 3 Nikon D300 cameras, each with a remote trigger release cable used to externally trigger the camera. Inside these cables are 3 wires, shutter, focus, and ground. The shutter and focus are ...
0
votes
0answers
37 views

Arduino not switching relays

I have an arduin Uno R3 , I need to create some kind of home automation system for a project, the problem is that everything I connect to the pins works fine until it gets to the relays, I tried ...
0
votes
0answers
45 views

Turn on PIR device with Arduino

I have a PIR operated device. I need my Arduino to turn the device on as the PIR sensor normally does. I have seen that shorting the PIR sensor for a couple of seconds does the trick. I suppose that ...
-1
votes
0answers
203 views

2.4" TFT LCD Shield isn't working on Arduino Mega

Even on ebay's website it is mentioned that I can't use 2.4" TFT LCD Shield display on attach to Arduino Mega. The problem is that I bought this shield by mistake. I want to put this shield onto ...
1
vote
0answers
30 views

ATmega2560 freeze on start up

My arduino mega freezes on startup. I am powering it with an ATX power supply and the Arduino does nothing after power is applied, until I hit the reset button. I thought the issue was the slow ...
1
vote
1answer
219 views

Inaccurate BandGap measurement

I've followed advice on the web on how to use "bandgap" voltage reference to measure supply voltage, however, the measurements are not as accurate as the ADC can be on an Arduino Mega. On the one ...
2
votes
1answer
52 views

Communicate with 3 Sensors with the same I2C address

I got three sensors stick from sparkfun : https://www.sparkfun.com/products/10724 which each one got an arduino pro mini that filters the data before to send to a main Arduino. Like this: and ...
0
votes
0answers
62 views

Are LCD module connections universal? - trying to troubleshoot a display

I'm trying to repair an older lighting console that has a blank on-board hitachi LCD display (240x320px, I think). I am trying to determine if the problem is the display driver board or the console's ...
0
votes
0answers
9 views

Arduino Relay Shield [migrated]

I am wondering if this Arduino Relay Shield design would be good enough to handle 120v 1amp The transistor is a 2n4401. Also The Two capacitors on the other 3 circuits would be going to ground opps ...
0
votes
0answers
22 views

Arduino Motor and RGB LED problem

A few weeks ago, I was working on an art project and it involved both spinning a stepper motor and driving some RGB LEDs through PWM using an Arduino UNO. Both functions worked fine on their own, but ...
-3
votes
1answer
23 views

How to connect mobile lcd with arduino? [on hold]

I am trying to connect Sony Ericsson w910i lcd display with ardunio. Is it possible to connect with it ? Thanks
5
votes
2answers
2k views

I need help getting my computer to talk to my Arduino Uno

I've recently jumped on the Arduino bandwagon and am attempting to upload my very first sketch to my Arduino Uno installed on COM port 3. However, I get errors that another device is using COM port 3, ...
1
vote
3answers
238 views

Powering and controlling multiple 12V LED strips with Arduino LilyPad USB

I'm trying to use an Arduino Lilypad USB to control several separate 12V white LED strips. I am however struggling to work out how to power them. The LilyPad only operates at 3.3V and I thought a ...
4
votes
2answers
4k views

SoftwareSerial on Arduino Mega

I'm trying to figure out if I can send and receive serial data on ports 23 and 25 of the Arduino Mega 2560, and I'm very confused by seemingly contradictory information on the Arduino website. From ...
2
votes
1answer
72 views

Thermocouple temperatures change drastically when my whole system is powered vs when just my arduino is powered

I apologize in advance if this should instead go in the Arduino stack exchange, but I feel it should be here. I'm using this thermocouple / amplifier pair with my Arduino Uno. I am trying to make my ...
0
votes
1answer
49 views

14 x 14 LED Matrix - How can I control it?

I intend to build a 14 x 14 standard 3mm blue LED matrix, for a WordClock-like project, but I have no idea how to control it. I've heard of multiplexing with NPN transistors, but I'm concerned about ...
6
votes
3answers
6k views

Using IntelliJ to for Arduino IDE

I'm on Mac OS X and have a license for IntelliJ Ultimate. Is it at all possible to use IntelliJ as an IDE for Arduino projects?
0
votes
1answer
46 views

Safe LiPo Charging

When charging a lipo: Is there a max current you should recharge at? Does the protection circuit on the lipo correct for the amount of current that should be going into the battery? I'm looking at ...
2
votes
1answer
226 views

can I drive 100 or so LRAs with WS2811 controlling DRV2603?

I would like to make a suit with 100 or more individually controllable Linear Resonant Actuators. Texas Instruments makes this http://www.ti.com/lit/ds/symlink/drv2603.pdf which take a PWM as an input ...
0
votes
2answers
156 views

Arduino PWM control MOSFET

I have a bit of a problem that in hoping someone can shed some light on. I have a 4 wire fan (from a power mac g5) and I found that the pinout is positive, negative, PWM and rpm output. It's a bit ...
0
votes
1answer
211 views

Water conductivity measurement AC, interfacing with arduino

I want to implementate this device, mentioned in the title. The problem is how to correctly build the " read out device" that is clearly a wheatsone bridge? But in AC, the problem is the signal ...
2
votes
2answers
2k views

Keyes IR receiver with Arduino

I'm trying to learn how to connect an IR Receiver to an Arduino Uno. I got this IR receiver as a gift, and I'm having a hard time finding a spec. sheet anywhere online. The module looks like this: ...
0
votes
0answers
15 views

Arduino Nano with Mac OS Yosemite 10.10 [migrated]

I have an Arduino Nano and i’m trying to use it with the Mac OS Yosemite (10.10). However, I’m having issues with the data transfer between the computer and the device. The Arduino is powered (LED is ...
-1
votes
1answer
96 views

Strain Gauge and Arduino

I have these 2 strain gauges as you can see in the image (code 632-180) and I want to connect it to the Arduino so I can read the deformation. They should be in Wheatstone Half Bridge. I read that ...
0
votes
2answers
131 views

How to easily get -10V and 170V

I have just managed to control an old LCD of type TLX-1013-E0 using an arduino. I would now like to use it for a project. But it needs -10V for the contrast and 170V for the background lighting. ...
0
votes
0answers
50 views

Sending data from an arduino after disconnecting the serial port

If I disconnect my arduino uno from my computer to measure an accelerometers data, how can I send the data from the arduino to my computer? Can I do it by reconnecting the serial port or can I only do ...
0
votes
0answers
20 views

Arduino + 4051 -> noise on certain 4051 pins

I am trying to use two 4051 ICs with an Arduino Micro right now. The idea was to have an 16-sensor demo station (8 sensors per ...
0
votes
0answers
18 views

Programming Atmega644p over ISP: avrdude initialization failed, rc = -1

I am using the Arbotix-M (Atmega644p). I am trying to program it using an ISP from Pololu. Until yesterday, everything seemed to be working okay and we were able to upload to it without problems. ...
0
votes
1answer
49 views

Arduino Recognizing pre-recorded sound clips from an audio stream

My project is to control a Nintendo 3DS hand held video game system from my Arduino Mega. I have all the basic controls wired up and working well. I need to be able to recognize the state of a video ...
0
votes
1answer
57 views

Basic microcontroller to dc motor setup [closed]

I am looking to program a microcontroller to power a dc motor at a given speed. The speed will be determined by a gyro reading of another spinning part. It will need to spin at about 4 Hz (240 rpm) ...
-1
votes
0answers
31 views

capacitor bank controller arduino [closed]

I am trying to use a Arduino to make a capacitor controller, I am using two MOSFETS, one with the collector connected to the output of the capacitor bank and the drain is the output. The other ...
1
vote
1answer
262 views

Basic Robotics Help. Variable motor speed control by ultrasonic sensor input on arduino

First, thank you for taking the time to read my post. I am attempting to use an ultrasonic sensor to control a DC motor using the PWM output of an arduino. Fairly simple, I know, but I'm just a ...
0
votes
1answer
67 views

IOUSBFamily is having trouble enumerating my device MAC OS X 10.9.5

Hi I have an arduino clone it is called gizduino mini usb it has a ATmega 328 processor, I followed the instructions posted on this website: ...
1
vote
3answers
59 views

Effect of 2-terminal and 3-terminal Voltmeters and Arduino Voltage Sensing on Circuit

I am trying to build a board to sense circuit voltage relative to ground at different points on a breadboard. I would want the board to work regardless of configuration of the circuit. The only ...
1
vote
1answer
80 views

Reading car speed sensor (SDV)

I've been trying to interface with my car's info screen, called a TID (Triple Information Display), from Opel. From the factory, there are multiple things attached to this screen, one of those a line ...
1
vote
1answer
108 views

How can I easily convert an analog signal to a digital signal?

I've tried searching for an answer on this topic but I must be phrasing it wrong because I can't find anything. I have a voltage range of about a 1 volt. I want to pass it through an Op Amp (or ...
0
votes
2answers
3k views

linear-control 12V DC fan with 5V low-current (Arduino)

I am trying to control a 12V DC computer fan ... without PWM for longer life and less high-frequency sound emitting Controlled by 5V positive voltage coming from the arduino after a DAC Using a ...
0
votes
0answers
30 views

Good tips for how to connect cables into Mux Sheild II? [migrated]

I just got a Mux Sheild 2 and got it working as I expected. Now I started to find out how to actually connect the I/O cables to the board. Doesn't seem to be as simple as I thought. I don't want to ...
0
votes
1answer
60 views

ATTiny85 Not responding to anything (Arduino UNO as programmer)

I'm trying to program 8 ATTiny85's I purchased from ebay but I can't seem to get any response from them. I have tried following several guides and even tried to use High Voltage Serial Programming ...
1
vote
2answers
57 views

AtTiny84 with USB

I am having some problems with the ATTiny84 and USB. I am creating an "arduino clone" but I want a simple (and especially compact on the board) way to implement a USB serial interface. This will only ...
-1
votes
0answers
7 views

Arduino uno not working? [migrated]

Recently I assembled my shapeoko machine, we used grbl shield with an uno for the same. For 1-2weeks everything worked perfectly then once when I tried to work the machine, the serial communication ...
0
votes
1answer
51 views

High Power LED and relay with the same power supply

I'm rebuilding optical printer (the machine which does Super8 to 16mm film blow-up) and designed new electrical circuit for it so I can control it with Arduino (or maybe later with Raspberry Pi). ...
1
vote
0answers
44 views

Atmega328P is not responding in avrdude using usbasp

I have a cheap Chinese USBASP clone and it works fine with my ATtiny13A, but I always get this: ...
0
votes
2answers
50 views

Detecting linelaser with photodiode and Arduino

I'm looking to experiment with a Valve Light lighthouse sort of setup. I've bought line lasers and pin photodiodes (BPW34) and get to successfully detect the laser line. The photodiode is in parallel ...
0
votes
2answers
90 views

Using a capacitor to properly power a servo

I recently attached a servo to my Arduino for the first time. I ended up needing a 470uF capacitor wired like this tutorial shows because my servo was freaking out and causing my laptop to throw ...
1
vote
3answers
4k views

On my Arduino, why is this LED always on, even though I told it to turn off?

I am a software developer trying to understand how computers work at a lower level. I have purchased the Arduino Uno Microcontroller and I have followed all of the tutorials from LadyAda. I have ...