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
39 views

light up a 5v led with arduino

I need to build a big 6 digit display using 7 segment displays controlled with an Arduino, but the every display I find uses 5V LEDs like this one: ...
1
vote
1answer
26 views

HC-06 (BT module) becomes un-responsive after ~20 minutes

I am seeing the following behavior on a HT-06 BT module (http://www.amazon.com/gp/product/B009DZQ4MG/ref=od_aui_detailpages00?ie=UTF8&psc=1) wired to an Arduino Uno. The module works great for ...
1
vote
0answers
18 views

arduino - millis() [migrated]

I copy from http://arduino.cc/en/Reference/Millis Tip: Note that the parameter for millis is an unsigned long, errors may be generated if a programmer tries to do math with other datatypes such as ...
0
votes
0answers
29 views

Multiple led fade using charlieplexing at Arduino

Fading single led using charlieplexing is simple (example code). Is it possible to fade all leds independently? (I would like to fade them all simultaneously and randomly with different periods using ...
0
votes
0answers
31 views

How do I connect a Button Load Cell to an Aduino Uno?

I have this 50Kg Button load cell(look at image) it has 4 wires :Red,Black,Yellow and green , a breadboard , and an UNO Ardunio . I want to connect this button Load cell to my Arduino and then program ...
0
votes
2answers
69 views

Need help with a VU meter analog signal

I am making an Arduino VU meter. I need to convert an analog AC audio signal to a varying positive DC signal. I would like the following outputs: 2.5 V output at 0 V input (from VM1); 5 V at maximum ...
0
votes
1answer
24 views

Control LCD with TIP121 on Arduino not displaying anything

I'm trying to control the power of an LCD I2C display. My project uses and Arduino and LCD, but when Arduino goes to sleep, the LCD stays on. So, to solve this problem, I connected a TIP121 transistor ...
4
votes
2answers
279 views

Why use an external resonator with an ATmega microcontroller if it has one built in? [duplicate]

Why should I use an external resonator with an ATmega microcontroller if it has one built in? I'm specifically referring to many of the 8 MHz Arduino boards. A lot, if not most, have an external ...
0
votes
1answer
26 views

please help me choose power mosfet for multilevel inverter

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
0answers
43 views

Arduino: How to accept user input (array, variables,…) [migrated]

I am working on a project using my Arduino mega2560 that triggers a solenoid (maximum of three solenoids), my camera and my flash (maximum of two flashes). The core routine is there, and working. ...
1
vote
1answer
66 views

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 ...
0
votes
2answers
110 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 ...
0
votes
0answers
50 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.
0
votes
1answer
67 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 ...
0
votes
2answers
55 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 ...
0
votes
0answers
5 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 ...
0
votes
2answers
60 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 ...
0
votes
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 ...
0
votes
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
votes
0answers
29 views

Questions on RC Truck/Arduino/Endurance [closed]

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 ...
0
votes
1answer
91 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 ...
0
votes
1answer
47 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 ...
0
votes
3answers
88 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 ...
0
votes
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
votes
2answers
158 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: ...
-1
votes
1answer
37 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 ...
0
votes
0answers
44 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 ...
0
votes
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 ...
0
votes
0answers
47 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 ...
1
vote
2answers
57 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 ...
0
votes
0answers
33 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 ...
0
votes
0answers
55 views

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

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 ...
0
votes
3answers
99 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 ...
0
votes
0answers
5 views

gps skm53 arduino not worcking [migrated]

gps skm53 not return latitude and longitude this code ...
-1
votes
1answer
40 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 ...
0
votes
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 ...
0
votes
3answers
109 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 ...
0
votes
0answers
7 views

Arduino Dimmer Shield Schematics Interpretation [migrated]

I've read so much about Thyristors, Triacs and Rectifiers on the last days that I'm almost undertanding my schematic, but I'm not there yet - I need some help. Overview: I'm making a home automation ...
0
votes
1answer
90 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 ...
1
vote
1answer
44 views

I2C level converter stops bus [closed]

I am trying to get an lcd 16x2 with PCF8574 I2C working with my arduino due. If i connect my lcd with 3.3v (backlight doesn't work, led from the PCF8574 lights up) and upload the i2c scanner sketch ...
-1
votes
0answers
37 views

Read bipolar torque sensor with Arduino

I have connected a bipolar torque sensor to an Arduino and I can without problems read the data when turning the sensor clockwise. The problem is, when I want to measure in the other direction nothing ...
0
votes
0answers
45 views

Programing other Atmel ARM chips using Arduino [migrated]

Ok, i know professionals generally hate Arduinos, but I would like to know if it would be possible to program Atmel ARM chips using the Arduino IDE. By which I mean, not needing to modify the source ...
1
vote
0answers
157 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
votes
1answer
63 views

Understanding how to use an accelerometer to detect vehicle collisions

Objective: To use an accelerometer to detect where on a vehicle a crash occurred (e.g. impact occurred on the passenger side.). Parts: Arduino Uno and LSM3030DLHC accelerometer Background: I've been ...
0
votes
3answers
57 views

Parallel LED strings of different colors and Arduino

I need to use 7 strings of led, each one of a different color. I will control each string using a Arduino and the BC 337 Transistor. The string will be connected to a 12V power supply. I have read ...
0
votes
0answers
36 views

Acheiving high data Rate via Xbee communication

We are developing a real time monitoring system for activity detection in Smart Buildings. We are using motion sensors and noise sensors to detect various activities in a Building. We are using Xbee ...
14
votes
4answers
2k views

Are solder bridges on chips always bad?

I just bought my Arduino Ethernet shield – a knock-off one for $10 instead of $60. I connected it up, but it doesn’t work – LEDs light up but do not blink, and no ethernet link is established ...
1
vote
1answer
39 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 ...
0
votes
1answer
51 views

PWM or Phase Control Dimming?

I want to dim a lamp around 70W or more using arduino. I have found two ways for doing that. The first one is to make a circuit that "cuts" the sine wave and produce the dimming effect (link). The ...
0
votes
1answer
87 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 ...