Tagged Questions

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0
votes
1answer
31 views

Use Arduino for switch a 12v powered remote control

I've a remote control powered by a 12v battery. I need to switch a button using arduino, can I use directly the digital pin without any relay or transistor? Thanks in advance
-1
votes
2answers
54 views

Software for drawing circuit diagrams [duplicate]

I have a simple project with some LEDs, LCDs and a few shift registers connected to an arduino uno. I want to be able to draw the wiring/circuit diagram a bit more professionally than what I can do in ...
0
votes
1answer
26 views

nrf24l01+ works on channel 10 but not channel 82?

Setup is nrf24l01+ with 328p running internal oscillator at 8Mhz. I have been using it like this for a while with no problems at channel 10, but now want to change to a higher channel such as 82, but ...
1
vote
1answer
85 views

Controlling 90 LEDs using one WS2811

I wanted to build a circuit where i would be able to control 90 LED's using one WS2811 and have a total of 60 WS2811. In this circuit I hope to connect 30 LED's per channel, there is no need for me ...
0
votes
1answer
25 views

Lower 5V output to 2V max

I am using a 5V 40A(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 5V ...
0
votes
0answers
10 views

Chaninging the delay lower than 4k gives no output using the library TimerOne.h [migrated]

I'm trying to get the color sensor TCS3200 to give color values with a delay lower than 4000 ms. I've found a library to interface the TCS3200 from this link. I've modified the code to serve my needs ...
0
votes
0answers
13 views

Guide to integrate CMOS camera with Arduino [migrated]

This is my first time working with camera. To start learning I need to capture images using the camera using arduino. I have Google searched on how to wire the camera and write simple program to ...
0
votes
1answer
44 views

Connecting a 12V DC power adapter to Arduino [duplicate]

I'm working on a school project and I am a total beginner on this arduino stuff. So, I bought this led strip at IKEA and used this tutorial to connect it and controll it with my Arduino. The thing is ...
0
votes
1answer
62 views

24 volt on microprocessor input pin

I have got my hands on a Intel Edison system on chip. I would like to use it to detect non-zero voltage. For example I have a test point that could be either 0 volt or 24 volt and I want to detect ...
0
votes
1answer
54 views

Arduino as ISP programming the Arduino, not the connected ATmega328P

I am trying to program an ATmega328P with an Arduino Uno R3. When I click 'Upload to Programmer' in the Arduino IDE (version 1.0.5), the Arduino programs itself and not the chip. Stranger still, the ...
0
votes
1answer
42 views

Regarding configuartion of 50kg load sensors with arduino due and 8-pin LM741CN Op-Amp

Please don't mind if my question is naive. I am new to this thing but I am pretty much interested in playing with these sensors. I am trying to configure the 3 wire load cell/strain guage (50 kg ...
2
votes
1answer
64 views

How to interpret complex commands from serial with arduino

In a project involving a serial communication and an Arduino I would like to use the serial interface to run multiple routines on the board. The idea is to send a unique string with tags and values ...
1
vote
1answer
84 views

Pull up does not work

I got a breadboard with some logic on it. Including it's own power suppply. It is connected to my Arduino Mega 2560 to fill a shiftregister with some bits. Whenevery my arduino is in a undefind state ...
0
votes
1answer
46 views

Arduino Uno R3 + Android multiple LED blink can turn on but wont go off

I'm new here and I have a question...I hope you could help me, any answer is more than welcome...so I am using an android app with switches to turn on and off 5 LEDs...I managed to turn on four of ...
1
vote
1answer
58 views

Tie Arduino - ATMEGA328P reset pin directly to +5V?

I would like to know if it's okay to tie the reset pin on an ATMEGA328P directly to +5V without using a resistor to avoid random resets and lower part count. If it's not okay, can you explain why it's ...
0
votes
1answer
56 views

Arduino controlling high voltage DC source, Opto-Isolator

I need to create a circuit that I can use an Arduino to control a 400~500 DC voltage source. I am not used to opto-isolators, but I was thinking about using it to separate both systems. But I cant ...
0
votes
0answers
38 views

Development Boards For Studies And Personal Use [on hold]

I would like to know of any recommendations (Arduino development boards or other types) which I can use for my University Practicals and for personal projects. We have been given Power Supplies, but ...
1
vote
2answers
140 views

Porting Code from Arduino Uno/ATMega328P to ATTiny85 not working, too many variables?

I have an Arduino Uno and am running a sketch with lots of variables (23 constant char arrays that have 54 object in each array). Along with all these variables there is lots of if statements. The ...
0
votes
0answers
33 views

High-voltage seven segment LED display driver problem

I've a circuit similar to THIS project, with a 74LS04 as inverters instead of 74HC54 (tested 74HC04 and CD40106 too) and ULN2003 instead of ULN2803. The circuit seems to work perfectly but when I turn ...
0
votes
1answer
45 views

Controlling an RGB 5050 LED strip with Arduino and potentiometers [on hold]

I recently found and old amplifier with the speaker taken out of it and thought it would look nice as a light feature. The switches and potentiometers are still in place but have removed the power ...
1
vote
1answer
28 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 ...
1
vote
1answer
54 views

Control 12V LED Strip with 5V from RaspberryPi or Arduino [on hold]

I have a 12V RGB 5050 LED Strip with no controller and I cannot change the color without modifying the circuit. What I want to do is hook it up to my Raspberry Pi or Arduino and control the color and ...
0
votes
0answers
47 views

use of laser beam and sensor to detect a fired projectile on air [on hold]

I want to digitally detect a 7.62 mm projectile on air after firing using a net of laser beams and sensors on the other side. What type of laser diodes and sensors should I use?
0
votes
1answer
47 views

I need 2 vcc pins on the arduino?

I need to connect the vcc pin to a bluetooth module but then I need to sue it again for a relay module what do I do?
2
votes
2answers
91 views

How long does ultrasonic rangefinder last

I've built a parking sensor in my garage that uses the HC-SR04 ultrasonic rangefinder and an arduino to measure how far the car is from the back wall. The one thing that I'm worried about is if the ...
0
votes
0answers
31 views

Is possible to get very narrow beamwidth antenna?

Is possible to make 60 dBi sector or patch antenna by make its beam width 0.17°/0.17° only ? how to calculate ideal dimensions against frequency at this range of beam width ?
2
votes
2answers
154 views

+5v and -5v power

I'm building an analog switching circuit which is controlled by an arduino. My circuit requires 25 4066 quad-analog switches. To get the required analog voltage range for the switched inputs, I ...
1
vote
1answer
55 views

High Frequency Logic Level Conversion

I am using Arduino DUE for my project which gives a 3.3 volt output signal. I have to convert it to 5 volts to use it with another device. The problem is that my signal frequency is 1 MHz. I have ...
0
votes
0answers
7 views

Arduino if else code [migrated]

I have made this If-Then-Else code, but it doesn't work. First I tough only the analog code is wrong, but if I take a digital port, the code doesn't work either. What did I do wrong? ...
-2
votes
0answers
38 views

Android Compatible microcontroller [closed]

I am looking for a micro controller like arduino or Raspberry PI which runs the Android SDK and can access Wifi , 3G and GPS. i am aware that it requires wifi shield and 3G + GPS shield but what i ...
0
votes
0answers
38 views

Bipolar stepper motor (Alfa Romeo 156 speedo) w/ L293D

I would like to use my Alfa Romeo speedo in my simrig, I have got the cluster pinout and the speed signal is coming from the ABS (Just like any other car, my BMW cluster works like charm). The only ...
1
vote
2answers
70 views

Digital trimmer capacitor

We would like to design an FM transmitter module for Arduino boards. Therefore, we are in need of a trimmer capacitor that can be controlled digitally. Do digital trimmer capacitors exist or do you ...
0
votes
0answers
53 views

Arduino with 6 motors controlled by Android device

For our first year engineering project, we are creating a guitar tuning device. We will need to control 6 motors, each turning a small knob (<1 inch) against a 10-20kg string tension. Manually ...
0
votes
0answers
8 views

X-CTU will not detect any of my XBee modules

I have a few XB24-DM modules, and I can't get X-CTU to detect them. I have tried the latest (6.2.xx) and 5.2.8.6. The old XCTU will at least respond when I push the button on the Shield when it asks ...
0
votes
0answers
19 views

134.2 kHz arduino reader [closed]

I am looking for an Arduino-compatible RFID reader supporting ISO 11784 & 11785 and reads a frequency of 134.2 kHz. Can someone point me in the right direction.
0
votes
3answers
61 views

Calculating gain of multiple antenna system

Some radars have thousands of antennas, there are also some routers that have multiple antenna systems. But I want to know how to calculate total gain of multiple antennas in a system? Is it simply ...
-5
votes
0answers
40 views

heavy urban 1200 km best band ? with no sky support [closed]

what is the best band can propagate 10 kbps of data from chicago to newyork by direct wave or groundwave "no any skywave support" ? how to calculate path loss at this long range ?
0
votes
0answers
8 views

Is my Arduino UNO fried? [migrated]

The title sums it all up. While testing the new proximity detector I bought off of Amazon, a spark flew from some random area and my Arduino's On LED went off while its Loop LED stayed in a dim ...
1
vote
1answer
35 views

Current on Easydriver stepper pin

I am using an Easydriver v4 to drive a bipolar stepper motor. The Easydriver works fine, if I wire it up and manually toggle the step pin to 5V/GND it steps as intended. Now I connected both the step ...
0
votes
3answers
99 views

How to measure amperate going through a 220V cable?

Meta objective: I want to pull up a TV with a winch, when the TV is turned off. I can already move up and down the TV invoked by my controller (Arduino Nano). The physical push-sensor stops the winch ...
0
votes
0answers
25 views

Why I can't connect more than one Arduino UNO + Ethernet Shield to my network? [migrated]

I am using 3 Arduino UNO with a Ethernet shield, each one is connected to my Home Internet Switch with a Ethernet Cable. Each Arduino UNO is collecting temperature/humidity for each bedroom in my ...
1
vote
0answers
24 views

Can't drive adafruit display with Arduino DUE

I'm currently trying to write a library for the Adafruit ST7565 graphic display. (see links below) The current one is entirely AVR specific and the code is generally pretty unreadable given the ...
0
votes
0answers
21 views

Bluetooth Low Energy Proximity sensing less than 2 feet?

I am working on a project where I need a TX and RX to be able to sense if the modules are within 2 feet of one another. Ideally, we would like to only utilize BTLE 4.0 for both devices since power ...
2
votes
1answer
296 views

What is an antenna amplifier ? How does it add gain?

I don't know what exactly does antenna amplifier mean. Is it possible to increase the gain of a Tx antenna ? Where do I connect the antenna amplifier to it ? If, for example, the Tx has a power of 20 ...
1
vote
1answer
40 views

Replace Electret Microphone With Arduino Output

I have the following circuit for a simple FM transmitter. I want to replace the electret microphone with a simple tone generated by an Arduino (or equivalent) that will be broadcast over FM radio. ...
0
votes
1answer
61 views

ATtiny85. How do I burn a bootloader? What is the process?

I want to use all six I/O pins of an ATtiny85, that means also using the reset pin as an I/O pin, however, I found out that if I disable the RESET pin, I can no longer program the ATtiny using an ISP ...
0
votes
0answers
65 views

ATTiny85. How do I use the reset pin as an analog input or digital output?

According to this datasheet, the ATTiny85 has 6 I/O pins if we include the reset pin. I used five of them to charlieplex 18 LEDs and I need another one to use as analog input. Would it be possible to ...
1
vote
0answers
58 views

i want to make my own bluetooth shutter release thingy as first electronic project, what do i need? [closed]

I want to make something like this http://www.amazon.com/JBtek-Bluetooth-Wireless-Control-Shutter/dp/B00JDMIOKO/ looks like it's a tiny microcontroller with a battery in the remote, but i'm not sure ...
0
votes
0answers
31 views

Arduino Broadband Peak Frequency Detector

I'm hoping to build a peak frequency detector, but am wondering whether I'm going to need more than just a couple of antennas. I'd like to be able to detect between 5Hz and 5GHz. So one question is, ...
5
votes
3answers
419 views

What should I use for powering a Raspberry Pi at near space altitudes?

I'm planning a high-altitude weather balloon project (to around 100000 feet) some time down the line to take video and pictures of near space altitudes and I have some questions I need to ask before ...