Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.

learn more… | top users | synonyms (4)

0
votes
0answers
21 views

beer pong cup sensing pod IR RGB led using arduino [on hold]

I want to build a beer pong table that has LEDs. I need some help in building the RGB pods, so that when a cup is on the pod, it changes to green and when the cup is out it turns red. How should I ...
1
vote
2answers
29 views

Two-wire communication (I2C) between Arduino Micros

I am attempting to communicate data via I2C between two Arduino Micros, but can't seem to get the "slave" device to detect a Wire.onRecieve() event. Per the specification on this site ...
0
votes
0answers
29 views

How to output kitchen scale voltage or actual weight value to an Arduino or Raspberry Pi? [on hold]

I want my kitchen scale to talk to either an Arduino or Raspberry Pi because I think I could connect the arduino or pi to the internet and then start keeping data on various things in the kitchen I'm ...
0
votes
1answer
54 views

Creating a common ground

I need to drive a 12 volt motor with a signal from an arduino. For this, I connect the ground of the arduino to the ground of the battery eliminator creating a common ground. I then connect the ...
-1
votes
0answers
12 views

How to upload one code inot a number of Arduino atonce? [migrated]

I am trying to Upload a single code in a number of Arduino one by one.But it is time consuming.So I want is, is there any way to upload the code at once to multiple Arduino? 1.I have tried as ...
1
vote
2answers
64 views

Register LED blink without reference to ground

I'm trying to trigger an Arduino pin based solely on the voltage across a blinking LED. I.e., when the LED blinks, I want to register the blink with the Arduino input pin. Unfortunately, I only have ...
0
votes
0answers
11 views

PID control arduino [migrated]

I am hooking up an accelerometer to an arduino uno and running it through this pid controller. However the output isnt going to my setpoint. When i move the accelerometer back and forth the data goes ...
0
votes
2answers
89 views

Cumulative LEDs

For a better explanation let's think something like an equalizer bar Think one of these bars. The coloumn has 16levels from bottom to top. If the level 10's led need to light up then, the all levels ...
0
votes
0answers
18 views

Why MATLAB do not always read from serial port? [migrated]

I'm doing a project where I need to read and write serial data between MATLAB and Arduino. But MATLAB do not always successfully read data. I set baudrate 9600 and my serial setup is like this: ...
0
votes
0answers
21 views

Accessing configuration registers of OV7670 cam on i2c [migrated]

I am a new user of Aurdino and want to interface OV7670 camera with aurdino uno which uses i2c mode of communication.I want to check the configuration of the device control registers and set them as ...
0
votes
0answers
44 views

4-Pin fan tach sensing gives weird results

I built a small setup to control a 4-Pin PC fan with my Arduino. Controlling the fan speed with PWN signalling works fine. But I can't get the tach readings right: The sense-cable from the fan is ...
0
votes
1answer
45 views

Level shift from 5V to 3.3V (and vice versa) using 74HC4050N,652

Below you will find a link to the datasheet for 74HC4050N. My order I placed had a suffix of ",652" on that part, but I'm not sure what that number refers to. ...
0
votes
0answers
49 views

What is more power efficient: GPRS or SMS for a GSM sim Arduino application?

I have a GSM shield for my Arduino and am wondering the most power efficient way to receive and send data from and to the cloud. The specific project I am looking to accomplish is starting my car ...
0
votes
0answers
25 views

Weird characters in Serial Monitor and not functioning ESP8266 ESP-12e [on hold]

I moved this question to http://arduino.stackexchange.com/questions/24573/weird-characters-in-serial-monitor-and-not-functioning-esp8266-esp-12e I did a bit of playing with my new ESP-12e, but ...
0
votes
1answer
47 views

PID controller stablizer application

I am wondering if a PID controller is the correct way to implement a stabilizer for a camera or any device. If I were to shake the device up and down and want to cancel out the movements by ...
0
votes
1answer
54 views

Running a Peltier directly from a transistor

New to post, but I come here often. So I am working on building a small fermentation chamber and i want to control the temperature using two Peltier's. One for hot and one for cold. I'm using two to ...
0
votes
1answer
71 views

PWM signals averaged or not

I am using analogWrite(PWM) from Arduino UNO to control the gates of 30N06L N-channel mosfets. The values of PWM are programmed such that it controls the current through the loads for my control ...
0
votes
0answers
43 views

Arduino I/O Shield relay won't switch [migrated]

I have an Arduino Uno and the I/O Shield wired up and I'm trying to switch (i.e. engage) a relay on the I/O Shield, but nothing seems to be working. I've identified the input pins correctly and am ...
0
votes
0answers
38 views

How to bootload a atmega328-pu using arduino uno? [migrated]

I have some Atmega328-Pu micro-controllers without boot-loader program. Now I need to burn boot-loader to them all. I have two arduino uno boards having Atmega328 P-Pu micro-controllers on board. I ...
-1
votes
0answers
34 views

ESP8266 IFTTT failing [on hold]

I have a setup which uses the ESP8266 12E and it opens a web server at a specific port 200. I have used the port forwarding to route the incoming data to this server .And I have used the duckdns to ...
0
votes
1answer
44 views

ACS712 Low Current Sensor

Before I begin, just to let you know that I'm new to electrical engineering, in case that my question sound weird to you, but here's my problem. I bought few days ago ACS712 Low Current Sensor and ...
0
votes
1answer
36 views

Trouble shooting IR Sensor

I am trying to build a heart beat sensor. I implemented the application circuit suggested by the datasheet of the sensor. But I get a constant reading at the Arduino. I confirmed that the IR ...
0
votes
0answers
42 views

Arduino MKR1000 Overheating problem… [closed]

I got a new Arduino MKR1000 board from World Arduino Challenge. It is working fine but seem to be WiFi shield is overheating when it is connected to USB. Am I the only one facing this problem?
0
votes
2answers
66 views

Pressure sensor unstable after Arduino power off/on

I am using my Arduino Uno to read analog sensor values from this pressure sensor. I have the Arduino powered with a 12V power supply from the wall. I'm using the 5V from the arduino for the LCD and an ...
-4
votes
0answers
18 views

nrf24l01 in not working correctly for specific bard but board and module is correct [closed]

i brought a nrf24l01 rf module which is working as transmitter and receiver separately but one of my module is not working as receiver with arduino i have replaced all components except arduino uno ...
0
votes
0answers
29 views

Ughh… My Arduino Code ain't workin'… And i just couldn't see any problems… Any thoughts? [migrated]

So i'm workin' on a counter just for fun. How it works is when you press BUTTON1 the LED Lights up red, the buzzer beeps and the variable "counter" adds one to itself; After counting, u can press ...
0
votes
0answers
21 views

Parallax servos (from BOE) move when no commands are sent through Arduino

I have Arduino zero and I'm using two continous parallax servos for movement. I have 2x5AA batteries, 5 for arduino and 5 for servos (1.5V each battery). In code I only use servo.attach(pin) nothing ...
0
votes
0answers
34 views

WiFi obscuring 433mhz signal reception

I have a WiFi arduino device with a 5dbi omnidirectional antenna and a 433 mhz receiver board, based on Aurel AC-RX with a 17cm stranded copper wire Antenna both enclosed into the same box. This ...
0
votes
0answers
39 views

Another mad guy trying position tracking with accelerometer (ADXL345)

I know... there've been a lot of discussions about if dead reckoning is possible with accelerometer... and i know the answer is "It is not possible without an external reference resetting the ...
0
votes
0answers
29 views

Flex sensor or are there better sensors for my application? [closed]

I'm building a project where I need to use a sensor close to the one here: (Flex Sensor). I'm using this sensor in a glove to move servos when my fingers move. Like this My question is are there ...
0
votes
3answers
66 views

Electronically, how to control this 5v arduino-style relay board from a PC serial port

I have the following relay board (pictured below), and to activate any of the relays, you simply connect one of the IN1-IN8 pins to ground. Easy. The current going between gnd and INx is negligible, ...
0
votes
1answer
36 views

Arduino Nano + HC-05 AT not working

I have arduino nano + HC-05 bluetooth module. I have used following pins D9, D10, D11 for HC-05 KEY, TX, RX and this works for data communication without any problems. D9 pin is set to output pin ...
0
votes
1answer
57 views

How do you drive a stepper motor with an L9110 driver module? [closed]

I have a dual channel motor driver module based on two L9110 H-bridges: The documentation and many, many tutorials on the internet mention that this can be used to drive two DC motors, or a signle ...
0
votes
1answer
65 views

How to use arduino nano to switch an 230V AC motor on/off?

I want to switch on and off an 230V AC motor with a relay what is controlled by an arduino nano. The on time and off time would be able to set by a 3-position slider switch. So would be 3 different ...
3
votes
2answers
214 views

US5881 Hall Effect sensor not detecting AC field

Yesterday I was disappointed to learn there is no magical IC to measure current flow in a standard appliance cord. On the advice I received, I went ahead with a US5881 Hall effect sensor and split ...
-2
votes
1answer
63 views

Is there supposed to be a voltage differential between V- and Earth Ground on my Power Supply? [closed]

I'm debugging something in my machine that's causing it to blow my communication chips (AtMEGA16U2 for USB connection) when I noticed a voltage differential of 0.3VDC-0.9VDC between V- and GND on the ...
0
votes
0answers
50 views

how to open a lock using RFID?

I want to use RFID to open a lock with an Arduino and I was searching in the internet about the components that will help me do that. My question is : do I need a servo motor or a relay to open the ...
0
votes
0answers
24 views

Arduino driver not work, cannot verify digital signature see code 52 [migrated]

For the first time once I wanted to connect my Arduino 2560 board to the PC through USB cable then the situation is following: Connection of USB cable between Arduino and PC Driver does not ...
0
votes
0answers
18 views

Trying to print text on LCD display from Arduino trinket [migrated]

I'm trying to simply program an Arduino trinket to display some text on an LCD display. I'm basically trying to follow this, except connect it to a Trinket rather than an Arduino Uno. The background ...
1
vote
1answer
108 views

Relay Feedback Problem

I am a computer science student working on a project for my Diploma and I am building a DIY PDU, I thought building something would be a lot funner then programming a website like 90% of the class ...
0
votes
0answers
9 views

HOw TO USE ULTRASONIC TRANSDUCER SENSOR WITH ARDUINO [migrated]

I already searched the site for a duplicate of this question but had a negative result my question is very simple I have a transducer ultrasonic sensor,it is a single piece and not couple,and i want ...
0
votes
1answer
124 views

Arduino and GSM Module running on Li-primary batteries for years

For one of our projects we need to run an Arduino board + GSM module (SIM800C for example) for many years on batteries without recharging. The Arduino should be in power down mode for 99,99% of the ...
0
votes
0answers
33 views

Moving a stepper motor in sine and chirp wave forms

I am trying to put together a set-up with a 4 - phase bipolar stepper motor controlled by an Arduino Uno and driven with a Leadshine ND556 stepper motor driver with a 12 V power supply. Once the ...
0
votes
1answer
24 views

Which pins does the Efcom 1.2 GPRS shield require to be connected in order to work?

I have this GPRS shield for arduino and I'd like to use it later on with some other standalone microcontroller. I have not been able to get it working though without connecting it to arduino and I ...
1
vote
2answers
63 views

Sound pressure to db analog

I'm trying to convert an amplified microphone output (it is from 0-5v, biased at 2.5v) to a linear response that correlates with db SPL. From my research, the output of the microphone directly ...
0
votes
0answers
6 views

Burning bootloader with Arduino as ISP when clock frequencies differ [migrated]

I've made a board with Atmega328, and I put there 6Mhz quartz (the reason to have 6MHz was to reduce power consumption). I need to burn Arduino bootloader to it, and I want to use Arduino Uno (16MHz) ...
0
votes
0answers
17 views

Arduino with wifi shield and 5AA batteries current draw [migrated]

Arduino uno with official Wifi Shield take 5 Volts. Arduino lights up as it should when powered but the WiFi shield is dead the l9 doesn't light up but works fine when arduino is connected to usb ...
1
vote
0answers
21 views

3 square wave pulse by 120° phase shift and 3 inverted of each by Arduino [migrated]

I want to make a three phase inverter (DC to AC) bridge type using Arduino. For that I want to generate three square wave each is 120° phase shifted and other three waves of main three waveforms ...
1
vote
1answer
31 views

nrf24 bluetooth image transfer

I'm trying to build "arducam-bluetooth-module-wireless-image-system" using an NRF24L01. I wish to have a long range transfer of a single image from a remote location to my Android phone whenever it ...
0
votes
0answers
33 views

Aruino/laser driver setup

I am working on a project that involves powering an arduino zero and a laser driver. The driver we're using is the OELDC-800DIP. So let's say I use a 9V Duracell battery, the arduino's range is 7-12V, ...