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0
votes
3answers
261 views

Should I use a snubber or solid state relays on a 24 vac circuit?

I'm trying to create a smarter controller for my hydroponic systems. I have an arduino controlling a sainsmart mechanical relay. The load on the relays are 24 VAC orbit sprinkler valves. Everything is ...
2
votes
1answer
200 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 ...
-1
votes
0answers
30 views

Analysing Motor frequency by a microphone and Arduino

I want to analyse the frequency of an electrical motor used for an industrial cooling system. It seems to me that the Arduino UNO is fast enough to be able to analyse and calculate the main frequency ...
0
votes
1answer
39 views

WS 2811 lights flickering

I'm working on a project involving a bunch of daisy-chained WS2811 lights and I'm noticing significant flickering on the ones at the end (lights #16-30 in a chain of 30). Right now, the circuit is a ...
0
votes
1answer
31 views

Connect the Sparkfun CAN bus shield with an RFduino

I have a problem which I am working on for some days now. I do have knowledge in electronics, but not extensively. I also posted this question in the RFduino Forum but couldn't get any good answers. ...
-2
votes
0answers
20 views

how to add .h file in Arduino library [on hold]

I am trying to make ultrasonic distance meter using Arduino. For this i add ultrasonic library. but on compiling it show error "ultrasonic.h not available" please tell me how to add this .h file
4
votes
4answers
9k views

Arduino - Stop execution of code definitly

I've got a big problem with my new Arduino. I made a big mistake, and now I can't anymore connect to my arduino. Is there any possibility to recover the Arduino, or to stop the execution of code ...
3
votes
2answers
3k views

How can I read in M-bus metering data with an Arduino Uno?

I am trying to send data from a Kamstrup Multical 601 to an Arduino Uno using the M-bus protocol. I am considering trying to use the libmbus c libraries to do this. However, I do not have a lot of ...
2
votes
1answer
383 views

MFRC522 on Beaglebone Black

I am trying to get my RC522 to work on the BBB. It works great on my Arduino which is well documented e.g. here or here. My only requirement is to read the serial # of cards which are Mifare S50. I ...
0
votes
3answers
114 views

Amplifying a 100mV range (sinosoidal wave) to a range of 0 - 3.3V for the Arduino

I have a partial discharge wave form which varies between -100mV to +100mV. For simplification, I am using a sinusoidal wave with that range. I need to amplify and bias this signal between the range ...
0
votes
0answers
7 views

programming attiny88 & attiny828 with arduino [migrated]

I found some information that the attiny88 and attiny828 can be programed from an arduino, similar to the programing of the attiny85/45, simply connecting the right pins. How to program Atmel ATtiny88 ...
0
votes
0answers
4 views

RC servo misbehave using arduino and MPU6050 [migrated]

I am a beginner.. I am trying to control RC servo using Arduino based of data from MPU6050. I am using library I2Cdev to communicate with gyro and to get yaw, pitch and roll. I am using example script ...
0
votes
0answers
27 views

Which TFT display to use for faster processing speed?

I'm planning to integrate a user interface into my arduino project and came upon TFT displays. While interfacing with the TFT displays, will it affect the performance of the arduino processing? Also ...
0
votes
1answer
73 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 ...
3
votes
5answers
10k 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
1answer
39 views

Connecting BeagleBone Black to an Arduino

I am a software guy (everyone immediately downvotes...) trying do the following: (1) On a BeagleBone Black ("BBB") I am driving a GPIO pin high in software. (2) Then I am sending PCM (audio) out ...
0
votes
0answers
4 views

Breadboard Arduino not loading sketches [migrated]

I have put together a breadboard version of the arduino by following the tutorial on arduino's main website https://www.arduino.cc/en/Main/Standalone. I have done everything exactly how that tutorial ...
1
vote
1answer
37 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 ...
0
votes
1answer
177 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
3answers
112 views

Arduino Uno reading analog 24v DC signal

Disclaimer: Please be gentle - I'm a newbie with electronics. Overview I have a proprietary 24v DC analog sensor signal that I'm trying to interface with using a Arduino based microcontroller. The ...
1
vote
2answers
260 views

Measuring current drops voltage?

We have some pcb in which contains an MCU ,and some WiFi module . Usually at start, the board takes 70-100mA with 3v3 . It gets its current from the UNO board connected to a mac. It works great like ...
5
votes
4answers
10k views

multiple arduino communication (1 master, n slaves)

I would like to develop a master/slave network that consists of: 1 Arduino master that reads sensors and generates velocity ramp profiles based on the sensor signals and then sends those ramps to ...
3
votes
1answer
7k views

Error in using Arduino virtual wire

I have this 433MHz RF Tx and Rx pair. I tried to transmit using following simple Arduino sketch, given in the VirtualWire manual. ...
0
votes
0answers
29 views

Receiving sensor data with Arduino: push or pull?

Every second I am reading a data string (comma-separated) from a battery management system via RS232. The first step was stripping the field name from the value; at times resulting in skipping a ...
0
votes
1answer
52 views

Can someone verify my EL wire oscillator?

I'm pretty new to electronics, but my latest project is a circuit with two "frames" of animation that I make out of EL wire, and I want to build a circuit to switch between them every 2-3 seconds or ...
0
votes
0answers
16 views

How to get the string from php page to sim900? [on hold]

I am doing this project in which when I type some string on php page and click on button,the arduino should display that string on the lcd. I am using sim900 GPRS to connect arduino to the internet. ...
0
votes
2answers
118 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 ...
1
vote
2answers
43 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 ...
2
votes
0answers
54 views

Is it possible to control the speed of DC motors with Arduino's analogWrite() using analog pins? [migrated]

I'm trying to control the speed of two DC motors that are connected to a dual H bridge. I always used digital PWM pins with analogWrite() to change the speed, but ...
-1
votes
1answer
81 views

please help me choose power mosfet for multilevel inverter [on hold]

I am doing my senior project on cascaded multilevel inverter. I am planning to use MOSFETs as switches in my project.Please kindly give me instructions and respective formulas for getting right ...
1
vote
2answers
123 views

Why is ground voltage non-zero, and why does it increase when I plug in an LED?

Here is the circuit (Arduino Due, 1kΩ resistor, LED): Note how I bring the ground from the Arduino board to the breadboard, and also connect the ADC pin to the gnd rail on the breadboard. Here is ...
0
votes
3answers
73 views

Basic power: drive 12v LED from 5v Raspberry Pi output — no 12v supply available

There are a lot of questions on here and elsewhere about this. The consensus seems to be to use a transistor to switch a power supply — implying that I have a 12v supply available. Only 5V is ...
0
votes
2answers
83 views

When should I use opto-isolators and isloated DC-DC converters?

I am using multiple DC-DC converters to obtain 12V and 5V. Shall I use non-isolated or isolated converter for Arduino's? From what I have read so far, isolated are used when you have inductive ...
0
votes
2answers
81 views

Strategy for a learning lawnmower robot, and choices of motors

I am pondering on building a practical learning lawnmower robot (could be Arduino based) and I am wondering if this will work. The robot will be both autonomous and RC (radio controlled). Given some ...
0
votes
0answers
26 views

advantages of a arduino uno waveform generator over an arbitrary waveform generator [on hold]

Could someone tell me a few differences or advantages of a arduino uno waveform generator over an arbitrary waveform generator?
1
vote
1answer
251 views

Start a teensy sketch after USB handshake has completed or upon a button has been pressed

I have an issue in starting a sketch on my Teensy at the right time. I work in a school as an IT technician and over the summer I go through all the computers on site, log-on and check if they're ...
2
votes
1answer
186 views

AVR program code location

I'm working with an ATmega328P and I wanted to interface with the flash memory writing data to it with the macros provided by avr-libc. This is the memory map for my chip: I don't understand where ...
0
votes
1answer
62 views

Driving IR LEDs using PWM - measuring current & current source questions

For a project I'm currently working on, we're trying to drive 940nm IR LEDs (Kingbright L-934-F3C) using PWM, regulated by an Arduino Uno. We've run into several issues during our prototyping process ...
0
votes
1answer
44 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: ...
2
votes
1answer
61 views

How to make arduino GPIO to operate at 3.3v instead of default 5v

I am working on a project, I use arduino mega 2560 with system operating voltage of 5v, at the same time I have a Bluetooth module which operates at 3.3v is there any way to reduce my arduino output ...
1
vote
1answer
15k views

Arduino board not detected when connected via USB

I have an Arduino clone called the InduinoX. It works with my mother's laptops and I can program it, but in my other laptop it goes undetected. It's last uploaded program works when connected ...
1
vote
3answers
977 views

Suggestions for solar / LiPo powered 3.3v supply for Arduino

I am building several slightly-differently-purposed Arduino + Xbee systems to monitor various things around my home and property. Some of these are line powered, while others must use solar. Many ...
0
votes
1answer
144 views

problem of transmitting data from serial device to bluetooth on Arduino

I am using an accelerometer which uses serial communication on Arduino (UART), I wish to transmit the data to a bluetooth module (blusmirf gold) using I2C and finally read it from my android ...
0
votes
0answers
25 views

Automate 3DS Analog Stick Input with Arduino

I have a Arduino that can output 5v and 3v. I have a Nintendo 3DS that runs on 1.8v. I need the Arduino to send between 0 and 1.8v to the Nintendo 3DS Analog Stick to control it. Do I hook up two ...
2
votes
0answers
42 views

node voltage conflict

background: My goal is to use an Arduino with two proximity probe (sensors) to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
0
votes
1answer
96 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
1answer
117 views

Can I use arduino to feed this circuit instead of an external power source?

I am following this tutorial to connect the output from my guitar with arduino. I'm wondering: is it possible not to use the batteries, and to feed the circuit with the 5V output pin provided by ...
0
votes
1answer
83 views

variable or field ' …' declared void

I'm working on an ADC ATSAM3x8e arduino due board. I'm trying to write new .h and .cpp files. How do I create a datatype like ...
0
votes
1answer
59 views

Using Arduino + MOSFET to automate the pressing of button

I am working on using Arduino Uno to automate the pressing of buttons. The configuration to the left is the current configuration and it works fine. However, the configuration to the right doesn't. ...
2
votes
4answers
1k views

Arduino moisture sensor value decreasing for no reason

I'm not sure what happened but all of a suden the moisture sensor I bought is acting strange. When I place it in soil and measure the value once per second, it decreases in value pretty quickly about ...