The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328 microcontroller.
0
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0answers
4 views
Ethernet shield or Wifi sheild - Arduino?
To control some LEDs through internet using Arduino UNO, which type of connection is better ? Ethernet or Wifi? (Later, I may connect some relays instead of LEDs, and control (turn on and off) some ...
0
votes
0answers
1 view
PFC8574 4x4 keypad.. correct wiring?
I bought a few PFC8574 and 4x4 keypads for a small project. I'm unclear on the correct wiring of the keypad to the PFC8574.
On the Arduino Playground's site, there are pull-up resistors for each ...
0
votes
0answers
9 views
Trying to send data to the server and AT+CIPSEND not working correctly
Sending data to the server(thingspeak.com/184.106.153.14) with AT commands on serial monitor works fine but whenever i upload the sketch ,the following always return false if(Serial.find( ">" ) ). ...
0
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0answers
6 views
How to get power for a nexus 7 while reading serial data from an arduino over usb?
Does anyone know how to simultaneously power a Nexus 7 tablet while simultaneously reading serial data from an arduino over USB? I have had quite some trouble with this and have attempted multiple ...
0
votes
2answers
17 views
Proper way to run functions in loop
I am having a problem getting my functions to run properly from the loop.
I am building a model railroad crossing gate and need to run the 4 processes once the sensor signals the train entering the ...
1
vote
2answers
11 views
Ultrasonic Range Sensor won't print distance in Serial Monitor
I'm using the red Ultrasonic Range Sensor with
Sig -> Digital Pin 4
VCC -> 5V
GND -> GND
The code uploads fine and i can hear the sensor clicking away, but for some reason it won't print the ...
0
votes
1answer
28 views
Atmega328p simple shortcircuit button
I am trying to get a simple button (GPIO shortcircuit) to work. I have choosen Pin D0 as input and Pin D7 as output. It works fine in Sketch but I can't get it to run in pure C. What am I doing wrong? ...
0
votes
2answers
25 views
Start program on PC using Arduino
I want to create arduino sketch that start program on my computer (i.e., browser) when I push button on Arduino itself.
Is it possible to make it using Arduino uno? I already know how to make a ...
0
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0answers
15 views
MQ135 Air Quality Sensor Signal Amplifier needed? Higher Quality Sensor?
I am trying to strengthen the signal from my MQ135 air quality sensor so it can detect aerosols from 3 feet away, as, currently as it stands the resolution is pathetic, it only blips from 0.21 to 0.58 ...
0
votes
1answer
20 views
Is Gsm antenna effect on microcontroller working?
in my embedded system I used patch antenna and Atmega 328 microcontroller,but somehow it causes the abrupt function of a microcontroller or reset. how can it be solved?
0
votes
1answer
18 views
Is this bluetooth setup good?
I am trying to do this tutorial http://www.instructables.com/id/Chappie-Self-Balancing-Robot/ on building a self-balancing robot with uno. However, I bothered by the Bluetooth wiring. I've done ...
0
votes
2answers
23 views
Can't make my stepper motor run clockwise and counterclockwise with AccelStepper Library
I'm relatively new to arduino thus need your help to figure out why my stepper motor doesn't rotate clockwise and counterclockwise. All I could do was to make it rotate only in one direction.
Here is ...
1
vote
1answer
17 views
How to reduce current from a AC TO DC power supply for arduino use
I have a AC to DC converter that was originally used for recharging the PSP, I stripped the 2 wires of the output and was wanting to use it for my arduino instead of using a 9V battery, it's output is ...
0
votes
1answer
14 views
What happens if EXT Connections to Arduino Motor Shield are interchanged?
While connecting the 9V battery to EXT port in Motor Shield I have mistakenly connected it to a wrong port (i.e., GND to VCC and VCC to GND).
Will this effect my motor Shield or Arduino?
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votes
1answer
13 views
Use object of LiquidCrystal class within another class
I am quite new to C++ and hope that I don't bore you too much with my question.
I want to use an object of LiquidCrystal Class in another class called "Display_ManagerClass". I followed the ...
0
votes
2answers
29 views
Are there any advantages to Wifi shields as opposed to a Yun?
I have an Arduino Uno and I have a remote sensing project I need Wifi connectivity for. After research I've found that I have 2 options:
Buy a WiFi shield for my existing Uno
Buy an Arduino Yun with ...
1
vote
2answers
31 views
Where can I find a hardware manual (or documentation) for Arduino board?
Where can I find a hardware manual (documentation or a book) for Arduino board?
As far as I know, all hardware details are dispersed (or scatter) in different tutorials.
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0answers
32 views
Motion detector provides false alarm
Motion detector gives a false alarm when GSM modem receives and transmits a message. PIR motion sensor gets triggered on falsely when GSM modem receives a message.
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votes
1answer
17 views
voltage output at digital pins vs. load
I am trying to convert the signal from digital pin 2 on my Uno to 3.3V. I set up a voltage divider with 3 x 1000 ohm resistors. When connected to ground and 5V the divider circuit generates 3.3V ...
0
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0answers
21 views
Only 1 DC motor spinning with motor driver l298N and arduino UNO? [on hold]
So, I am making an RC Car and the problem is, that when the two motors i have should go forward, only one does, and when I turn off one motor, the other one works normally... I am powering the motor ...
1
vote
1answer
23 views
OLED with arduino?
I recently bought a 0.96" Serial OLED Screen. I am not very experienced with this. I'm trying to display some text with the Arduino Uno. I installed the adafruit SSD1306 and GFX libraries but no luck. ...
1
vote
1answer
24 views
MQ4 gas sensor is not working with Arduino UNO
I am trying to detect LPG leakage by using MQ4 gas sensor.
I have made this circuit
My Arduino code is
int sensorValue;
void setup()
{
Serial.begin(9600); // sets the serial port to 9600
...
1
vote
2answers
40 views
Integer goes garbage after iteration
I'm writing a library for Charlieplexed LED display (trying to write a common one actually). The library is working quite fine. In my arduino sketch, I'm using an integer to keep track of the LED, ...
1
vote
1answer
26 views
Why is my LED blinking?
I have this simple push button schematic:
The idea is that the LED is on as long as the button stays pushed, with the switch closed.
The code is below:
int ledPin=10;
int switchPin=5;
void ...
0
votes
1answer
17 views
Two or More Arduinos Handshaking
research would show that there are numerous ways for two arduinos to talk to one another. But i was looking for a 'basic robust protocol' (..it doesn't sound basic ....I know!), to allow for two ...
0
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1answer
18 views
Arduino Uno Constantly Resets with WiFi and 4 Relay Module
I am using an Arduino Uno with a 4 relay module (found here: ...
4
votes
1answer
150 views
Arduino on breadboard, and then soldered using a board made on Eagle but won't work
So I'm looking to create an arduino clone to mount on one of my robots. I started off making the arduino on a breadboard, using the instructions found on Arduino's own website and I succeeded. It ...
0
votes
0answers
19 views
Getting NaN error in Processing when Xbee is used and trying to create a popup window.
I am trying to get data from D6T Omron thermal sensor. It works fine with both Arduino and Processing when I connect it to pc directly. However, it seems to always cannot read my last data in my data ...
1
vote
1answer
15 views
Funduino Uno with 5V 1A power supply?
Can I use a "Funduino Uno" arduino with power from a power bank with DC 5V 1A output?
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votes
0answers
15 views
SM 130 RFID reader, with Arduino Uno. Trying to read RFID passive tags on Arduino version 1.6.7
I am trying to read passive tags using these two devices and an arduino uno, for a class project of trying to make my own doggy door. However, all the code I have been able to find is out of date, ...
0
votes
1answer
26 views
Sampling Rate of Arduino Uno
It might be a stupid question but, I am currently using Arduino Uno with the 16MHz processor, what is maximum sampling rate of data available to me if I want to read data of a sensors such as ...
0
votes
1answer
33 views
arduino quadcopter freezing while reading MPU6050/RC Receiver
I am trying to build an Arduino Flight controller. I have an MPU6050 (Gyroscope/Accelerometer) on board that is helping me configure my stabilization software. I also have my ESC's, and receiver ...
3
votes
2answers
88 views
SDA/SCL pins Arduino Uno
I am trying to figure if SDA and SCL pins from Arduino Uno is a TTL or a CMOS technology. I am not able to find this info anywhere but regarding it is a I2C protocol it does make sense to be a TTL ...
0
votes
1answer
22 views
What are some “must-have” sensors or shields for an Arduino robot or motor?
I am starting to learn Arduino and wanna make some projects.which components will I have to buy?please help me.
1
vote
1answer
18 views
What is the necessity of “Prototyping Shield” for an arduino UNO R3? [duplicate]
I just want to learn arduino and make some small projects.But in beginner starter kit there's a part named Prototyping Shield .Is it necessary or will it help me?
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votes
1answer
29 views
NEO 6M GPS SPEED
I am doing a project using NEO 6M GPS with my arduino lilypad.
I programmed it already, and it's working well except of the speed. I get stuck on fixing this, I wonder why the value is never getting ...
0
votes
2answers
52 views
Project 2: Arduino controlled spaceship interface
The circuit diagram attached shows that the switch is open. Yet, the LED connected to pin 3 of the arduino board lights up.
I don't understand this - the circuit is open, so why should pin 3 light ...
-1
votes
1answer
17 views
Beat 1 LED light is always on - should turn off
/**************************************/
const int lowestPin = 1;//the lowest one attach to
const int speaker = 13;
int ts = 4;//how many beats you want
int count = 1;
const int keyPin = 11;
const int ...
0
votes
0answers
6 views
NEO GPS 6M connecting to Lilypad Arduino
I'm working on a project that has something to do with receiving gps data from the satellites. With this, I've used GPS NEO 6M with an arduino Lilypad for wearable purposes.
I've already tried using ...
1
vote
2answers
20 views
Using Arduino and Xbee at the same time
I have 2 Arduino Uno's, 2 Xbees and 2 Wireless Proto Shields. The first setup has a humidity/temperature sensor (SHT21P) and it writes data to serial and it works (i've tested it). Now I have the ...
0
votes
1answer
48 views
Why does this code show me a lot of space?
I want to make a 4hz reading of GSR and temperature, in the following format for every second:
697,20.8744
696,20.86521
695,20.8653
699,20.8777
The print, in python, would be print(GSR+","+Temp)
...
0
votes
0answers
6 views
Which tft works on both Arduino Uno and Raspberry pi
Ideally I'd like a 2.8 inch and it to be touch screen.
But most of all I'd rather it work on both boards without much hassle.
0
votes
1answer
15 views
radio wave generation using arduino
const byte ANTENNA = 9;
void setup()
{
// set up Timer 1
TCCR1A = bit (COM1A0); // toggle OC1A on Compare Match
TCCR1B = bit (WGM12) | bit (CS10); // CTC, no prescaler
OCR1A = 9; ...
1
vote
1answer
20 views
No sketches will upload to Arduino Uno board; says “access denied”
I'm using an Arduino Uno board with an HP computer running Windows 10 and IDE version 1.6.8. Arduino was working fine for me until a few days ago, when (and I suspect this is the root of the problem) ...
0
votes
1answer
10 views
Join Serial Data Seperated by Newlines?
I have two Arduinos connected through Bluetooth. One sends a string of data similar to 506:507:1\r\n. The data can vary similar to 0:1000:0\r\n. I already have functions to break that string down into ...
1
vote
3answers
50 views
Arduino UNO doesn't produce expected square waveform
I want to produce quick square waveform for testing purposes. If I will use this code:
void setup()
{
pinMode(2, OUTPUT);
}
void loop()
{
bitSet(PORTD, 2);
bitClear(PORTD, 2);
}
I will get ...
2
votes
3answers
57 views
Can I measure velocity from an accelerometer? How accurately?
I've bought this module
Kootek GY-521 MPU-6050 MPU6050 Module 3 Axis analog gyro sensors+ 3 Axis Accelerometer Module
My project will involve affixing this to a moving object, moving at velocities ...
0
votes
0answers
9 views
Want to setup a wireless communication using nrf24l01 [on hold]
I want to transmit a alphabet from one arduino to another using nrf24l01 trans-receiver and receive the same alphabet on the receiver nrf. I want to get a transmitter and receiver code with ...
1
vote
2answers
29 views
SMS Receiving problem - Arduino Uno and SIM900A GSM Module
My intention is to control an LED according to the content of the SMS received. For example, if the SMS is "ON", turn on the LED and if it is "OFF", turn it off. I referred many sites and got the ...
1
vote
2answers
45 views
Forensic security of Arduino (SRAM)
Pardon the double post, but I'm not getting much traction with this question over at arduino.cc so I'm looking for answers here now.
Original post: http://forum.arduino.cc/index.php?topic=391698.0
...
