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1answer
12 views

Arduino Nano with Mac OS Yosemite 10.10

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
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0answers
35 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
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0answers
17 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
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0answers
17 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
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1answer
44 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
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1answer
50 views

Basic microcontroller to dc motor setup [on hold]

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
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0answers
29 views

capacitor bank controller arduino [on hold]

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
99 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
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1answer
65 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
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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
55 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
44 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
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0answers
36 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
44 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
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0answers
19 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 ...
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0answers
58 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 ...
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0answers
31 views

What is the refresh rate of a Neurosky headset?

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
78 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
27 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
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3answers
82 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
26 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
39 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
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0answers
30 views

How to gather data about how weight is distributed by feet on a surface over time? [closed]

Consider this youTube video where the video shows a representation of a person's bare feet and how their body mass is distributed across their feet and how their feet are moving to different positions ...
0
votes
1answer
95 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
96 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
33 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
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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
106 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
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1answer
61 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 ...
-4
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0answers
54 views

GY951 Sensor Interface [closed]

How do I interface GY951 (9DOF accelerometer, gyroscope, magnetometer) with Arduino Mega? I want to interface it for controlling the quadcopter. The pinouts of GY951 are: ...
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 ...
0
votes
1answer
27 views

LT3029 regulator for arduino mega

Does the LT3029 regulator give out 9v 500mA without external circuitry needed for it?... I'm planning to use it for my arduino mega... I really haven't used that regulator before ...My main power ...
1
vote
1answer
77 views

What happens in the Arduino power supply schematic?

I was just looking at the power supply part of the Arduino Uno, but I am a bit confused: 1) Why the opamp LMV358 with VIN as input (USA)? 2) Why the opamp LMV358 with SCK as input? 3) Why an LP2985 ...
0
votes
0answers
50 views

HC-05 Bluetooth AT+INQ command not working

I have followed the directions from the site below for bluetooth comm between an Arduino board using the HC-05 and an smartphone. It works fine. The problem is that I need to measure the RSSI from my ...
0
votes
0answers
21 views

Software I2C - Atmega8 [migrated]

I am using Atmega8 with 12MHz crystal, on my breadbord. I can use SDA and SCL pins with default arduino library wire.h, and it works. But I want another pins to use I2C protocol. I tried library, ...
0
votes
1answer
59 views

Relay Solution for Controlling Pumps with Arduino

I'm working on a hydroponics project that requires me to run 10 pumps for 15 seconds every 2 minutes. I was able to set this system up by running a relay board off of an Arduino, but the relays were ...
0
votes
2answers
52 views

Keep brightness high whilst multiplexing [SOLVED]

I have searched a little but I'm a noob to electronics so it was hard for me to understand. So here is my problem. I have made a little 3 x 3 led matrix to test. When powering 1 led it was fine, but ...
1
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0answers
37 views

Leaking power off of a coil

I am trying to make a wireless door opener by adding a small Arduino with a relay switch into our home phone. Unfortunately, that home phone operates without a power source, it has wires for audio and ...
0
votes
0answers
29 views

Arduino Uno - Analog Circuit Simulator [migrated]

I control an analog circuit with Arduino Uno. I want to simulate an Arduino Uno with operational amplifiers (741). Can I simulate Arduino with SPICE?
0
votes
2answers
42 views

Arduino remove power if battery voltage is too low

I want to power my Arduino using a Lithium-Ion battery. When the battery is below 3.0V, the power to the Arduino should be disconnected, and when it rises high enough again is should be reconnected ...
0
votes
2answers
40 views

How to use a Raspberry Pi Pin(3.3V) to reset a ATMEGA328(5V)

I have a ATMEGA328(AVR) connected to a Raspberry Pi(RPI) via serial using a level shifter. The AVR has the Arduino Bootloader installed and I would like to program it via serial. What would be the ...
0
votes
0answers
28 views

Arduino uint8_t to String or char- retrieve from usb device [migrated]

My code returns uint8_t format when is cast to char and Display on LCD it works fine but I want to get that scanned code for further processing. not only to display on LCD 16x2 , but it returns some ...
0
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0answers
18 views

Can I connect TFT LCD screen to Arduino Leonardo same way as it's recommanded for Arduino Uno? [migrated]

I want to connect the Arduino TFT LCD 1.77" screen to an Arduino Leonardo. Acording to this tutorial I should connect some pins on LCD screen to ICSP pins on Leonardo but I don't have equipment to do ...
2
votes
2answers
94 views

Preventing Arduino from getting lightning strikes and protecting it

I want to use an Arduino as a weather station and I want to put it high up in a tree. It should be independent and powered by solar panels. This is where the problem starts. Lightning strikes occur ...