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
1answer
67 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 ...
23
votes
3answers
4k views

Why do Arduinos ship w/ 16MHz crystal instead of 20MHz?

Why do Arduino boards ship w/ 16MHz crystal instead of 20MHz? They are spec'ed for operating at 20MHz, after all. I guess there are a few advantages to running more slowly (lower power consumption, ...
0
votes
0answers
18 views

Measuring touch-weight resistance in piano keys

Piano technicians, such as myself, use an old, labor intensive way of measuring touchweight resistance in piano keys. I would like to automate this process electronically. This is an explanation of ...
2
votes
1answer
243 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 ...
-2
votes
0answers
17 views

Beginner Projects for Arduino Uno and Raspberry Pi [on hold]

I'm an absolute beginner in doing stuff with the Raspberry Pi and Arduino(Uno). Actually, I just got them yesterday. I was wondering if there were any beginner projects for them. I would prefer if the ...
0
votes
0answers
21 views

Optimizing an Arduino code [migrated]

I am working on project and using Arduino Pro Mini (Atmega328p running on 2xAA) to measure the time to charge a capacitor (when the volt level is high). This is the code I used while testing: ...
2
votes
3answers
692 views
5
votes
5answers
11k 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 ...
0
votes
1answer
46 views

Implementing Safety Shut-Off Relay In Project

I am working on a project which I have poured lots of cash into that involves water, pressure and electronics in very close proximity of each other... Lately, I have been considering adding some ...
-1
votes
1answer
31 views

Infrared Door opener

I have a case here, in the main entrance corridor, we have a door which have an automatic door opening mechanism if you push a button. There is also an IR receiver, I was planning to make a ...
1
vote
3answers
270 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 ...
-1
votes
0answers
29 views

ESP2866 Style controller but 5GHz [on hold]

So I'm looking into using the ESP2866 for some projects but I noticed it operated in 2.4GHz. Is there a cheap alternative that supports 5GHz?
3
votes
1answer
89 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 ...
10
votes
3answers
16k views

Which programming languages are supported to program Arduino?

I would like to start to play with Arduino. I've read that C and C++ are the official languages but I've also found other way to communicate using Python or Java for example. Which programming ...
0
votes
1answer
43 views

Feeding arduino with ATX standby power

I'm designing an Arduino shield to allow the Arduino to control, among other things, an ATX power supply -- I'm running GPIO pins to the PS_ON and P_OK pins of the ATX. I would like to be able to run ...
0
votes
0answers
5 views

How to program a CLK signal and its inverse with Arduino/AVR [migrated]

Is it possible to simultaneously output a clock signal and it's inverse using the timer register(s)? I'm using the following code in arduino to output a 1mHz signal on OC1A: ...
0
votes
1answer
52 views

Proper Method of Powering Nokia 5110

I am considering getting some Nokia 5110's for use with my Arduino Nano board but I am in a pickle because I can't tell the correct way to wire it. Some people say to power it with 3.3V and only ...
0
votes
0answers
74 views
+100

Controlling electric power steering using an Arduino to emulate torque sensor

I am trying to control an electric power steering rack with an Arduino. To do this I need to "trick" the EPS module that there is torque being applied when there really isn't. On the rack there are ...
0
votes
1answer
1k views

How to switch a 220V AC electric bulb using a relay through Arduino?

My aim is to switch an electric bulb operating at 220v AC. For this purpose I use a 12V DC relay that can operate for 220V appliance according to its data sheet. My relay circuit is as under: ...
0
votes
1answer
47 views

RC522 Reads card but not tag

Dear Fellow Engineers, I have just recieved two RC522 modules from eBay, both of them came with a card and a tag. Both of them read the cards just fine with miguelbalboa's library ...
2
votes
1answer
306 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
2answers
46 views

TMP04 Temperature Sensor with Arduino Not going HIGH

I have a TMP04 temperature sensor (3 pin package). It outputs a square wave at approximately 35Hz and the duty cycle can be converted into a temperature reading (see datasheet). It has an operating ...
-1
votes
1answer
105 views

Current and voltage from PV ( LTS25NP , LV 25-P)

So in my design I am going to sense two PV panels in series ( Both voltage and current) to extract the Maximum power point (MPPT by arduino) so the input of both sensors will be the PV output and the ...
-3
votes
0answers
27 views

Send arbitrary Wi-Fi raw packets with ESP8266 and Teensy 3.1

I have a Teensy 3.1 and a ESP8266, and I want to craft special raw packets (such as ARP packets). I searched the web and I found a discussion on www.esp8266.com ...
1
vote
0answers
48 views

Raspberry Pi GPIO pin layout + Cooking Hacks Shield [migrated]

I am studying the schematic diagram of the Raspberry Pi to Arduino shield from cooking hacks and I noticed that there is an inconsistency in the labeling of the pins. So, this gives me two questions. ...
0
votes
1answer
85 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 ...
2
votes
3answers
1k 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
0answers
15 views

Arduino WiFi goes SOAP XML [on hold]

In my project I need to communicate with smart camera via its wi-fi network through a series of HTTP POST with SOAP XML envelopes within. So, what shield/module I should buy ti do it? Could it be ...
0
votes
1answer
16 views

Xbee serial communication

I'm building a mesh network with xbees, arduinos and sensors. Right now I have 2 Xbee routers and 1 coordinator. Each xbee module has an arduino attached. To communicate from the router to the ...
1
vote
0answers
34 views

How to use L293D to spin HDD motor FAST?

Short version: I have a HDD motor I want to spin. I have the L293D chip and after hours of fiddling with code and timing, can only achieve 1200 RPM. How can I get more out of it? Long version: I have ...
0
votes
1answer
57 views

MX-FS-03V one transmitter to many recivers

I want to use MX-FS-03V RF module as single transmitter to many receivers. As this module sold as pairs I don't know if this works or not or any trick to do this. i think the screw on the module ...
0
votes
2answers
140 views

Detect if usb device is connected on the other side of the cable

Is it possible to detect that there is a device connected on the other side of the cable without using any current sensor? I simply want my arduino to do something when i plug my phone to charger. I ...
0
votes
0answers
35 views

ULN2803 acting really strange when changing Vsupp from 9V to 5V

So I'm trying to replicate a camera flash for a model camera, I'm using an atTiny, pushbutton, some bright white leds and a pushbutton. My sketch is very similar to the ButtonStateChange Example in ...
5
votes
2answers
259 views

Logging lithium battery discharge: why this curve?

I'm using Arduino to log the discharge curve of a 5V battery pack (usb type for smartphone recharging). Using Arduino I read the voltage every second and I save it to a log file. Arduino is powered ...
3
votes
2answers
5k views

Problem with Arduino UNO and RC servo

This is my first attempt to work with a servo and I'm using this tutorial. I have a "TowardPro MG996R DIGI HI TORQUE" servo directly connected to my Arduino Uno as follows: I also created the ...
1
vote
1answer
50 views

H-Bridge help (Choosing MOSFET)

I need help with choosing MOSFET for H-Bridge for driving my arduino bot. I have got 2 dc motors to use, so I need 2 H bridges, I am trying to make it as small as possible. I need to control speed ...
0
votes
1answer
107 views

Controlling dc motor in arduino with and without a load

I wonder if there is an alternative solution to this problem: I have a 3v water pump being controlled by an arduino, which pumps water out of a bucket. I would like the pump to turn off once the ...
0
votes
1answer
203 views

Implementation of PSK modulation/demodulation

I want to implement a BPSK modulation/demodulation using a microcontroller (Arduino Due). The carrier signal should be at 1-50 MHz and the information rate at 300 KHz. For the sender part I would ...
0
votes
1answer
86 views

Can I connect a MOSFET to an Arduino directly?

I have the following electromagnet and plan on connecting it to the following MOSFET which will be controlled by an Arduino (I'm thinking analogue or PWM). Do I need any other parts (resistors etc.) ...
0
votes
0answers
28 views

Cannot read PORTB from ISR [duplicate]

I am trying to interface an ultrasonic sensor to Atmega328P (arduino uno). I have connected ECHO pin of the sensor to PORTB and used pin change interrupt on this pin. Inside the ISR I try to read ...
6
votes
2answers
3k views

How can I detect which arduino board (or which controller) in software?

I have a project that I want to work on either a Uno or a Mega (or even a Due) and it would be nice if I didn't need two versions of the software. For example, on a Mega, to use SoftwareSerial, you ...
0
votes
1answer
49 views

Making a magnetic levitation system with arduino

I am planning on making a magnetic levitation system with an arduino that checks the value of a hall's effect sensor twice per second (but I have tried even 1000 times a second though) and turns the ...
0
votes
3answers
61 views

sd mp3 player board *Christmas Present Project* [closed]

I recently bought a turtle night light that projects starts and plays a little lullaby. the music is triggered by a switch but i would like to have it so on click of the switch it plays music i have ...
1
vote
1answer
294 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 ...
0
votes
0answers
58 views

Replacing an IR sensor with buttons

So i have this HI-fi sub-woofer control thing that only has remote control support and i have no remote and I've got no codes for universal remotes. tbh just some switches on the side would be all i ...
-1
votes
0answers
52 views

Video Conferencing [closed]

I'm currently struggling about my final year project. I want to accomplished this video conferencing project. Actually, I'm building a device with camera and projector. I wanted it like a video ...
2
votes
1answer
128 views

Completing circuits with transistors and arduino

Hello and thanks to anyone who helps. I am trying to create a test bench for a control board we commonly work on at our business. One control board has 11 pins that a ribbon cable would be connected ...
1
vote
2answers
58 views

3.3v from 5v Arduino digital pin

I have an ESP8266 that I've got connected to my arduino and communicating quite well with... Now I'm looking at options to run my conifig via battery, so need to find ways to shutdown the ESP8266. ...
0
votes
1answer
70 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 ...
1
vote
2answers
53 views

Interpreting CAN Bus Data from OBD Port

I'm using Arduino with MCP2515,2551 to read data from CAN bus over OBD port of my car, Honda Jazz 2012. From what I've read on other forums and OBD wiki, I can transmit the PID query to engine over ...