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0
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1answer
11 views

Level Adjustment Component

I am developing simple project of water level alert when water reaches to a certain level (adjusted by user) in inches. Which electronic component i should use where user can adjust inches? Like 5, ...
1
vote
1answer
40 views

Small stepper, simple driver

It's a very small stepper at 18 ohm resistance per coil(2 of them) (4 phase). I got: stepper in the picture, L9110, LM358, arduino. I used an L9110 with the arduino. The stepper moved where it was ...
0
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0answers
21 views

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

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 ...
2
votes
2answers
232 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
6 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
63 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 ...
-1
votes
0answers
41 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 ...
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 ...
0
votes
0answers
50 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 ...
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
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
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 ...
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 ...
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
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 ...
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
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 ...
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 ...
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 ...
-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
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 ...
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
45 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
0answers
21 views

Arduino RX TX and Bluetooth HC-06

Hi guys I am newbie in arduino.I am using arduino nano here and trying to wiring with Bluetooth HC-06 I am using voltage devider between Tx(arduino)-Rx(Bluetooth). Now I have a question - I upload ...
0
votes
0answers
64 views

What tool can monitor voltage on a bundle of wires?

I'm working on a vehicle and trying to determine which wires control which circuits - power windows, power locks, starter, trunk release, etc. I've searched but have not been able to find the wiring ...
-3
votes
0answers
32 views

What is the refresh rate of a Neurosky headset? [on hold]

I'm working on a project which is based on a Neurosky Headset. I need to receive brain wave data from that and use them in my Arduino. The most important thing here is that I need the data in ...
0
votes
3answers
80 views

One resistor on two LEDs [duplicate]

This question is a little bit stupid and silly. As I am chemist, I don't remember electricity physics very good. As I remember it shouldn't harm anything, but I need to be sure. LEDs will be ...
0
votes
1answer
29 views

Relay sla-05vdc-sl-c is not working on arduino uno and nano

At first time, trying to check this relay modules (I got 2 the same) they both worked nice - no problem. But now I am going tu build the temperature controller for old fridge (it is working ...
0
votes
3answers
83 views

Non-inverting op amp on breadboard isn't working

I have posted this before and I have another question. I just can't get this working on a breadboard. I don't know what I am doing wrong. My voltage source is from an Arduino UNO which outputs a 5 ...
0
votes
1answer
27 views

Reading Current Transformer using Arduino

I want to be able to read current using an Arduino. I have purchased a Hobut Current Transformer from Farnell (Element14): ...
0
votes
1answer
45 views

How to set baud rate 57600 with CH340G?

I'm working on android drivers (native code) for CH340G USB-to-serial chip. I've successfully tested it with baudrate 115200 and Arduino Uno CH340G but for some reason it does not work with baudrate ...
0
votes
1answer
60 views

Solenoid circuit current issue

I have been working on a circuit go make a solenoid switch polarity with arduino. I originally used transistors (NPN) rated for 1A and 625mW in between the ends of the solenoid and ground. These all ...
0
votes
1answer
97 views

Problem with 7-segment display: dimly lit when off

I'm driving two large seven-segment displays using two shift registers (74HC595). The displays have a forward voltage of 12V and a max forward current of 20mA. I'm feeding data and 5V of power to the ...
2
votes
3answers
97 views

How to create a locked door detector?

I'm trying to build a device that alerts me when I leave home without locking the door. I have a little space inside the door (width 8mm x height 130mm x depth 8mm) where I plan to install the ...
0
votes
1answer
38 views

Load Cell Data Problem - INA125P + Arduino Uno

I am currently reading data from my 30kg load cell with my Arduino UNO board and passing this data to my PC. I am using INA125P to amplify the voltage of my load cell and it is established on a bread ...
0
votes
0answers
14 views

Using arduino IDE with USBasp [migrated]

I'm trying to upload a Blink example from Arduino IDE to an atmega8a via USBasp. I have edited the boards.txt file with the specifications of the atmega8a, and I am using the "Upload with programmer" ...
0
votes
0answers
32 views

Rope vibration/touch sensor

I need your help. I need to find a way to sense wether a tense rope is being touched or not. Another way it should work is measuring if the rope is vibrating. I don't have limitations on the rope ...
0
votes
2answers
111 views

Arduino interface with I2C Pressure Sensor

I have a Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor that I want to read using an Arduino. Looking at the datasheet, I know that the I2C address is 0x28, and I have had a play with bits of code ...
2
votes
2answers
79 views

Switch that turns on both arduino and motor shield that use different power supplies

I have the Arduino Uno and the Adafruit Motor Shield, and they are powered by separate power supplies. I want my toggle switch to turn on and off those two, I would appreciate if someone post a ...
0
votes
1answer
22 views

Controlling valves the efficient way

I am working on a Project that require something very simple. Is actually so simple that I’m more worried about getting it the most efficient way (less price with better solution). The project ...
0
votes
1answer
62 views

Detect sudden change in current and send signal to arduino

I am trying to make a smart power socket using Arduino. The socket should power even high power equipments at 230 Volt 50hz through a relay. I want my arduino to analyse the amount of current taken ...
0
votes
0answers
74 views

Digital Potentiometer and Motor Speed Controller [migrated]

I'm trying to get a Chinese 20A DC Motor Speed Controller working with a MCP42100 Digital Potentiometer. The analogue potentiometer supplied was 100kOhm. I have programmed my arduino with the ...