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Tagged Questions

4
votes
3answers
456 views

Understanding a circuit for reading current passing through human bodies

I found on Instructables this circuit that is used to detect when two conductive pads are touched at the same time by a person (or, in that particular example, a chain of people). Used in ...
0
votes
1answer
79 views

Separated powers and high power switches? Alternatives to relais?

I want to use an Arduino (5V, 0-40 milliamps) to control some switches, which in turn control a high current line (12V, 40A). But the relays which I use use too heavy coils for the Arduino to pull ...
1
vote
2answers
77 views

Trigger led with both Arduino and tactile button

I want to trigger a LED with both an Arduino and a hardware switch without coding any button logic in the Arduino. simulate this circuit – Schematic created using CircuitLab When the ...
0
votes
1answer
206 views

how to cut off power from usb device using arduino

Seems like I can't restart USB modem in Linux, so I setup an arduino gig to emulate usb modem plug/unplug. I have Arduino Uno R3 and several N-channel mosfet https://www.sparkfun.com/products/10213, ...
2
votes
5answers
223 views

Override digital out with pushbutton

I have an Arduino Digital Out pin connected to a 1k resistor, then connected the base of a 2N3904 transitor. In fact, that same digital out is connected to several resistor->base-of-2n3904. Each ...
1
vote
1answer
117 views

Is it possible to get input from a 10x10 grid of switches using an arduino board? (Uno, Mega, etc.)

I'm more of a software guy but I'm working on a prototype of a game that will use a pressure sensitive 10 by 10 grid. This will require 100 switches just for the grid. The closest I've found to off ...
1
vote
1answer
310 views

Arduino: Common Ground Issue? Powering Buzzer, LEDs via transistor as a switch

I'm working on an ugly Christmas sweater with a Lilypad Arduino. Previously it was setup to power LEDs on each side of the sweater using just the voltage from the digital output pins (alternating ...
0
votes
2answers
213 views

Power on Arduino on tilt signal

I need to turn an Arduino on when something triggers an independently powered tilt sensor; the Arduino needs then to stay awake and use an output pin to switch itself off. I couldn't find an example ...
2
votes
3answers
398 views

Can arduino be used as a switch?

Hello I have had zero luck with finding anything related to this problem. Lets take the most basic circuitry: switch that turns on the light The values on the sketch are not accurate, couldn't ...
0
votes
0answers
78 views

arduino to control RF transmitter

I took apart a cheap RC car. I want to leave the original power supply intact and have arduino control the "switchs" or "buttons", forward , reverse motors. The transmitter runs on 2 AA alkaline (2x ...
3
votes
1answer
172 views

Multiplexers used as a switch seem to “leak” when power is cut

Description Attempting to build a device using the Arduino that will allow me to remotely restart a cluster of desktop computers that I have. The device works by momentarily connecting the RESET ...
1
vote
1answer
351 views

msp430 using Button as switch

I am trying to do this(http://www.arduino.cc/en/Tutorial/Switch) without using any external parts because I was able to use button example from same site with this code: http://en.textsave.org/VjL) ...
3
votes
2answers
218 views

In search of a component or device that switches multiple lines based on input selection

Okay so the foundation for my curiosity is that in dealing with Arduinos, I found they can be used to program the similar but smaller ATtiny chips. This is the main hookup configuration that some of ...
1
vote
2answers
193 views

How to switch AC line on and off with a DC control wire

This might be a really simple rookie question. I (who am very new to electronics) need to be able to switch a 24 VAC line on/off using a DC signal coming from an Arduino. Google searches have been ...
2
votes
1answer
139 views

5V and 1.4V switching circuit for a sensor

Why this circuit provides only 2V on the load (33 ohms resistor) when the switch to the gate of the MOSFET is closed ? I was expecting it to switch between 1.4V (caused by the 85 ohms resistor) and 5V ...
0
votes
3answers
286 views

Digital SPDT switch

I know this is probably a stupid question but I am hobbyist and could not find a solution to this problem. I have a micro-controller that sends a PWM signal to a transistor that lets current flow ...
0
votes
1answer
338 views

Mosfet as a switch problem? [closed]

I need some help using a mosfets as a switchs. I have both 2N7000 and STD5NE10L N-Ch mosfets. I want to use an Arduino logic signal (5V) to turn on and off a 3.3V regulator. The regulator takes its ...
2
votes
1answer
94 views

Are there any issues in using traditional switches with an Arduino?

I'm using an Arduino Micro for my project. I'm planning on using two switches as digital inputs. One is for an override switch and a setting switch, but their functions aren't particularly important. ...
1
vote
1answer
136 views

Help dimensioning mosfet as switch with high current

I have the same problem as the guy in this question, but in this case the input voltage varies from 20 volts to 28 volts. I would like a current of 20A to flow through the mosfet without it getting ...
1
vote
1answer
187 views

Wiring a switch to toggle both usb power and external power on Arduino

I have a 5v Arduino Pro Micro. I am using it to run a series of motors. I am controlling it through the USB port. The USB power doesn't supply enough current to power the motors, so I am using a 9v ...
1
vote
2answers
630 views

easiest way to detect a switch change using an arduino

I have a pinball machine thats an old electro mechanical type. I want to add LED's and do some fancy programming on an Arduino to animate the lights according to the score value of whatever target ...
0
votes
0answers
151 views

Controlling Wall Switch

I intend to control the operation of a wall switch through an arduino board. I'm wondering if there's a good way to wire into this switch to do so, or if I need to go farther back. Here's the switch ...
3
votes
0answers
909 views

Arduino - Trigger an iPhone's touch screen with no human interaction

I'm trying to replicate part of this experiment. Specifically, I want to touch the screen with a cable and some aluminum foil whenever I send a signal from an Arduino pin. From the blog post linked ...
5
votes
1answer
455 views

Wiring an illuminated toggle switch

I'm trying to build a model rocket launcher circuit. So far I have this The igniter requires 12V and 3A, BAT1 is 12.6V 9800mAh. The arduino input pin should read HIGH when the igniter is connected ...
3
votes
2answers
2k views

Do I need to use a resistor with a microswitch to limit current for an Arduino Uno?

I'm using an Arduino Uno to control a small robot and I'm starting to add micro-switches as bump-sensors. I know that when I'm creating a circuit with LEDs I need to use resistors to limit the current ...
2
votes
4answers
205 views

10 million switching cycles with a hall effect sensor

I am trying to build a pull switch for my invention that can survive 10 million cycles, and in a previous question here I recieved advice not to use a mechanical contact. The other problem is size. ...
8
votes
3answers
707 views

Ten millions cycles on arduino

I am trying to build a suitable pull-switch for my invention. Inside the switch, there is a tiny metal plate. When the user pulls the switch, this metal plate gets close to and makes contact with two ...
-2
votes
1answer
304 views

Remote controlled RS232 switching

A mission critical fire alarm system has a GSM module that is connected via RS232 to a computer whose task is to notify emergency response teams. In case the computer fails, an off-site operator is ...
5
votes
2answers
702 views

Sensing magnetic pulses from a rowing boat impeller

I'm a mechanical engineer at uni who has some basic experience in electronics and programming. I'm building a system for my rowing boat to help me with my training. This will give me feedback on a ...
0
votes
1answer
52 views

Part to use for solar charging terminal

I would like to use an arduino device to control a 12V 17W water pump and filter, what type of part to I need that can switch the 12V power on and off?
1
vote
1answer
272 views

Automating button presses

I'm working on a project which involves automating the pressing of some buttons on a device. There are five push buttons, which are quite stiff and require fast repetitive presses - around about ~7Hz ...
1
vote
2answers
512 views

5-pole, double-throw relay

I am working on an electronics project where I need a two way switch, that can be controlled using an arduino and can be soldered by hand. I tried to Google for it, but without luck. Does anyone know ...
0
votes
1answer
715 views

How to simulate the depression of a push button connected to an Arduino, with another Arduino?

I have an Arduino which uses several push buttons to simulate the keypad of a digital door lock. This microcontroller remembers the last four depressed buttons and turns a LED to green if the code is ...
1
vote
2answers
631 views

Switch hookup with relay (Arduino)

I have the following 5V relay board: Please ignore the light bulb hook up. That was an example on the website that had the same relay :) And I am looking to hook one of the relays up to a monetary ...
5
votes
3answers
3k views

(Bad) counting digital pulses with Arduino using interrupts and a 4 pin switch

I have to write an Arduino sketch to accomplish some tasks with the number of digital pulses detected by a pin. For this purpose I chose to use interrupts in order not to miss any pulse and perform ...
2
votes
3answers
563 views

How can I get this button to be more reliable for my arduino program?

I have been working on this program for a simple controller. I have a prototype all wired up and working however the momentary push button is not very reliable. Sometimes it reads and other times it ...
1
vote
1answer
134 views

Controlling electricity flow via MIDI to power lamps

I'm looking to build an interesting lighting rig comprised of lampshades for my band. Here's an image of what I want to achieve: I have Logic pro running in my Macbook pro. I want to create MIDI ...
0
votes
1answer
763 views

electrical switch controlled remotely via mobile bluetooth arduino

Without arduino what other ways? If I use arduino should I use ardunioBT and write a mobile software for communicating with arduinoBT. Or using Amarino with a arduino board is better (as amarino has a ...
-1
votes
1answer
310 views

switching DAC output to multiple inputs

I am currently using a DAC (mcp4922) and want to send the output voltage (0 to 5V) to 1 of many (14) inputs on an Arduino Mega. I am currently using some VN2222 fets for switching (because I had them ...
1
vote
1answer
702 views

Arduino to act as a switch for a remote

I have a wireless remote control for a light. It runs with a 12V battery. It has two mini Omron type B3F momentary ON switches (mini push-button switches). One button is for Light ON, the other for ...
0
votes
0answers
39 views

Digitally programmable switch using minimum space (without relays) [duplicate]

Possible Duplicate: How to short two nodes electronically I want to make a pcb containing about 32 switches (that do a physical connection between wires) each can be programmed digitally ...
1
vote
1answer
2k views

How do I make a switch on the Arduino?

I have the Freetronics Eleven, which is 100% compatible with Arduino Uno. Ultimately, I want to make a foot pedal switch that connects to a digital pin on the arduino so that a LOW is read when the ...
2
votes
2answers
757 views

Remote Power On/Off Switch

This is kind of a strange request, but im looking for something that could remotely power a Hard Button switch. The kind of switch im referring to is like the ones on a computer power supply. I was ...
0
votes
2answers
936 views

Xbee Shield - Turning jumper settings into ON/OFF (XBEE/USB) manual switch

I have the following Xbee Shield where I need to constantly switch jumpers in order to allow Xbee communication and/or USB communication. The following is set for Xbee communication: "Xbee ...
1
vote
2answers
651 views

What kind of resistors do I need to use in this Canon remote switch, if it is possible at all with the P2N2222A transistor I have?

I'm a total electronics n00b set out to create an intervalometer for my Canon EOS 350D camera which seemed super simple from the outset, but I got a bit blocked with creating a switch using a ...
1
vote
2answers
3k views

how to connect relay and physical switch to control light

I am new in this kind of stuff so please excuse me for my lack of knowledge :) I have successfully connected blackwidow(wifi + arduino) with relay to control a 220V light bulb. Now i want to embed ...
8
votes
5answers
2k views

How to have arduino only turn on when enough power has been collected?

There was recently an article in the Christian Science Monitor about the launch of a cracker-size satellite. The article says that the satellite has, "power storage in capacitors, and switching ...
3
votes
1answer
209 views

Signal strength on Freetronics 100% Arduino Compatible Board

I have been using a Freetronics 100% Arduino Compatible board to run switches that trigger sound file players in MaxMSP. The only sketch and patch I could use to get the board and Max communicating ...
7
votes
4answers
979 views

Latching switch ideas

I'm trying to build a latching switch connected to a door and would appreciate ideas. The switch is connected to a microcontroller input pin, and I'd like it to operate as follows: When a person ...