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How to prevent servo startup jitter

I have a small Arduino Uno powered robot I'm entering in a competition, and it uses some small servos to position sensors and other actuators. According to the rules, it can't move until a ...
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1answer
45 views

Is it possible to connect many arduino uno in one pc?

Our concept is that we have many arduinos and we will be putting each of them in a cubicle and all of them are connected to only one pc. PC will stand as a server were you can control your arduino ...
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2answers
73 views

Why does my LED blink when too much voltage is applied?

I bought a set of simple light-emmiting diodes. Connecting one to Arduino's full 5V output (without a resistor) causes the diode to blink. However changing the duty cycle to a value below 80% causes ...
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39 views

Best way to add capacitance to LC circuit?

I'm trying to simplify the way I ask things around here. How would I make the switches digital and controllable with an Arduino? The circuit is running at 170VAC @ 150kHz.
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2answers
171 views

Multiplexing problem with Arduino, MAX7219 e BJT

I tested the circuit below with an Arduino UNO, a MAX7219 and BC338. The sketch in Arduino is a chaser, so the leds should turn on in sequence. It consist of 7 segment (A-G) and two Digit (0-1). The ...
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2answers
51 views

Beefcake relay control kit - Sparkfun

http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Components/General/RelayBoard-Large-v16.pdf I'm trying to determine the base current of the NPN transistor but keep getting numbers an order of ...
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1answer
1k 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 ...
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4 views

STEPPER MOTOR CONTROLLER Using LEONARDO PRO MICRO [migrated]

I want to Use LEONARDO PRO MICRO and A4988 Stepper Motor DRIVER to control Nema 17 Stepper Motor. Please let me know how to hookup these together. Please give me a circuit for this type of ...
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2answers
114 views

Using adafruit Flora or Adafruit Trinket + MPU-6050 3-Axis Gyroscope + nRF24L01+ together

I am trying to do a project where I need to transmit data from an object if the object is moved in a particular way. The restriction is that the device has to be as thin and small as possible. I am ...
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1answer
94 views

Increasing RF24 range using an antenna

First time poster here on electronics, so please excuse any big mistakes. I'm working on a project that uses the NRF24L01+ chip for radio communication between an arduino uno and a raspberry pi. It ...
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2answers
55 views

Arduino How to improve laser detection on photodiode?

I am building arduino laser transmitter. I have modulated laser blink, however the photodiode detection is not really sensitive to the beam (I would need to spread detection at higher range). I tried ...
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3answers
406 views

How can I emulate two analog joysticks (potentiometers) with an Arduino?

I have a quadcopter (Syma X5C) that I really want to control with an Arduino. Since I have the ability to write programs to my Arduino to make the quadcopter fly autonomously, I want to modify my ...
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0answers
38 views

Belt moving around [on hold]

I need a syringe to move about in a set loop. The 'map' for it to move on is very squiggly, and it needs to move a short distance precisely (to the nearest 0.1mm). How to I do this? Also, I will be ...
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1answer
579 views

How to amplify the signal of a TCRT5000 phototransistor

I'm trying to read the IR signal from my Itron C1S Power meter. It has an emitter that lights up for 10 ms every Wh of consumption. This question is based on my prior question: Use a photoresistor ...
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3answers
116 views

Lower 5V output to 2V max

I am using a 5V 40 mA (max current) output on an Arduino to turn on (5V) or off (0V) as laser driver. The laser driver requires a max voltage of 2V to turn it on and flips at 0.8V. How can I lower the ...
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2answers
241 views

Controlling AC mains using Arduino and removing control easily

I am planning to for an Arduino to read status of a switch, and accordingly switch on and off AC appliance, for a demo purpose. I want to add a feature to it of easy recovery to manual switch control. ...
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1answer
90 views

How to keep the signals at the pins on a Arduino upon software restart

I have a Arduino board, connected to a relay. When the digital pin on the board is set to HIGH, the relay closes. If the digital pin is LOW, the relay opens. Now that from time to time, I will have ...
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0answers
271 views

Arduino Bluetooth Module not holding connection

I am using an HC_05 Bluetooth module and an Arduino Uno to try and set up a simple bluetooth connection with my Windows Phone (HTC 8X). I am following the online tutorial here. When I go into ...
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0answers
56 views

Arduino Based Solid State Drive [migrated]

I've searched high and low for something to get me on the right track, it's making me think it might not be possible. Basically, I want to create a cheap SSD using Arduino (or another microcontroller ...
0
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1answer
44 views

H-bridge problem with TIP122.

I tried to make H-bridge by TIP 122 transistor. I used 9V for a VCC. I used push button to control H-bridge, and it's fine. Then I used Arduino 2560 with two digital pins for driving H-bridge. But the ...
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0answers
29 views

Questions on RC Truck/Arduino/Endurance [on hold]

I've googled, and searched - nothing too related to my question. I appreciate any help. I want to get an RC Truck (1/18 scale) or something to use as a Chassis - and control via Arduino/Bluetooth. My ...
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1answer
84 views

How to step down 12v to 5v efficiently

So, I have a wall-wart power supply giving regulated 12v 500mA to a 2.1mm Jack. I'm using this to power a 12v 160mA fan, and an Arduino Pro Mini (at 5V). I understand that the Mini's regulators to ...
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1answer
300 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 ...
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3answers
85 views

Sending data from 4 transmitters to 1 receiver without a microcontroller

I am working on a project to wirelessly check whether any of four switches are pressed and I don't want to use a microcontroller on the transmitter side. I have worked with the cheap 434MHz HT12E/D ...
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1answer
182 views

Detect alternating current using one contact only and arduino analog input

I am trying to setup an arduino so it can detect an AC where it only has access to one pole. (kind of like these "electricians screwdrivers" that you put in one of the connections of an electric ...
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0answers
21 views

Need help with on off switch to power arduino. [migrated]

I am trying to add an on and off power switch to my arduino project. My project is running off a 9v battery and I would like to save as much power as I can. There might be a better why that I don’t ...
3
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2answers
156 views

Using arduino code for mass production

I have prototyped a connected object with arduino and I would like to go for mass production, actually just a few hundreds to start. I'm going to design a customed PCB with everything integrated: ...
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2answers
1k views

How can I use arduino to control 4 motors speed and direction?

I consider this question different from others because of the variety of things I need this setup to be able to do. Description: I want to build a minimalistic motor controller capable of controlling ...
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1answer
31 views

Question about RFID Reader Frequency and RFID Tags

I'm researching about RFID Technology as i'm trying to build a RFID Reader using an Arduino and/or Raspberry Pi which i been trying to do so for a month however with no avail. So i been reading up as ...
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2answers
3k views

On my Arduino, why is this LED always on, even though I told it to turn off?

I am a software developer trying to understand how computers work at a lower level. I have purchased the Arduino Uno Microcontroller and I have followed all of the tutorials from LadyAda. I have ...
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0answers
42 views

How to generate the gate voltage for the P-channel transistors for an H-bridge controller

I would like to create an H-bridge out of discrete N and P-channel transistors as a nice demo of the concept for a high school course. The driver is to be an Arduino should that affect your design ...
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2answers
54 views

Voltage drop when measuring battery capacity

I'm trying to build a battery capacity tester for Li-ion batteries. I made this schematic using Arduino: While bush button is not triggered arduino only shows battery voltage on Serial & when ...
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0answers
46 views

Upper values of analog reading of sensor is cut off

We are using a dual element Motion sensor for our project. Here is the link of sensor we are using. Dual element Motion Sensor You can find the datasheet in the same link. This is our circuit ...
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0answers
3 views

Which components to built remapping keyboard via USB in + out (remapped) [migrated]

I know that it's fairly easy to change the emulate keyboard and mouse by Arduino. But I'm quite specific about the goal I would like to achieve hence I would appreciate if you could advise me which ...
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1answer
84 views

Circuit for flashing led strips controlled by Arduino Nano

I'm building a project to flash three concentric rings of LEDs in sequence to give the effect of light moving from the centre to the edge. The circumference of each loop is based on an even number of ...
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0answers
32 views

multiple RGB LEDS on minimal pwm pins VS current limitions

the theory explained at Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino? isn't really working with the arduino current limitations mentioned at ...
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2answers
316 views

Power Arduino Mini with 3 AA batteries

The arduino mini consumes 5V. The Voltage input is min. 7V. Is it possible to ignore that and attach 3 AA batteries (4.5V) or 4AA Batteries 6V between the GND and 5V pin of an arduino mini for long ...
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3answers
5k views

What are the most common ways to fry an arduino?

I've fried two Arduinos before: one was an Uno, which I killed with too high of an input voltage, and the other was the ADK version of the Mega, which I never was able to conclusively determine what ...
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2answers
74 views

Soldering, Chips for Beginners

I am currently running a club for kids (9-11) for Arduino and we are making a robot and are moving on from motor/transistor drivers to half-hbridge (so we can go backwards). The kids are learning to ...
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1answer
54 views

How best to power down an Arduino for ~5 minutes at a time?

Reading over the datasheet it appears the longest it can shutdown for is 8s so should I just keep a counter in the loop method that checks if it's run 38 times and then execute the code I want? Would ...
2
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1answer
931 views

Using a pulse sensor with Arduino, is it possible to code in Actionscript?

I'm attempting to construct a program that will read pulse through a pulse sensor I have hooked up to my Arduino Duemilanove Board. Easy enough right? OK...but I'm trying to code it using ...
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2answers
477 views

Reduce noise from a Hall effect sensor

I am currently working on a magnetic levitation project using a Hall effect sensor for distance measurement. I drive the coil using two 12 V car batteries in series to form a 24 V DC source, ...
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1answer
38 views

Synchronus Buck Converter

So i am designing a Synchronus Buck converter 12V - 5V with 12 W of power at the output. This means that my output current will be on average 2.4 A. Now for the feedback I am using an Arduino. I will ...
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0answers
5 views

gps skm53 arduino not worcking [migrated]

gps skm53 not return latitude and longitude this code ...
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1answer
87 views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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2answers
59 views

Unconnected item on circuit diagram

I'm looking to use a CAN Bus shield with my Arduino. The following is a circuit diagram for it: https://www.sparkfun.com/datasheets/DevTools/Arduino/canbus_shield-v12.pdf I am having trouble reading ...
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1answer
278 views

Arduino & Niko Home Control

I would like to know if anyone has been able to take control over 'Niko Home Control' with Arduino? I Googled, but can't find much on this topic. Is it even possible? I guess it's not really ...
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0answers
143 views

NTC Thermistor Resistance Calculation for circuit using Wheatstone bridge, Op Amp & Arduino

I'm trying to work out the formula for thermistor resistance when using Wheatstone bridge/op amp circuit as opposed to a voltage divider circuit. I know for a voltage divider the \$R_t\$ value is ...
0
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3answers
103 views

Why does a closed circuit with a pull-up resistor output “0”?

I have a switch setup with a pull-up resistor. With the switch open I get a "1" or HIGH output and with the switch closed I get a "0" or LOW output. I understand why I am getting the "1" with it open ...
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3answers
9k 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 ...