A microcontroller board based on the ATmega2560 or 1280 chip. Use this tag for questions specifically regarding the Mega, and not just general Arduino usage.
0
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0answers
22 views
MEGA2560 + SIM900A - constantly blinking, not responding
recently I got new Arduino Mega 2560 and GSM/GPRS module - SIM900A v3.8.2 (there is the same - ebay. com/itm/MINI-V3-8-2-Wireless-Data-Transmission-Extension-Module-GSM-GPRS-SIM900A-/311402424851 ).
...
0
votes
2answers
33 views
Use of additional i/o ports in Arduino Mega
I'm a newbie in Arduino and I bought an Arduino Mega instead of the Uno. I want to know what the so-called additional i/o pins do. Are they the same with PWM and SPI? What can they do?
0
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0answers
21 views
2.4'' TFT Shield doesn't work on Arduino MEGA
I have bought an TFT LCD display shield (chip 35702) and i followed instructions from this post. I am testing on Arduino Mega. After i upload the binary on Arduino, the screen display shows this:
0
votes
1answer
16 views
embedXcode: Link Error using an Arduino library (Servo.h) within a header file
For various reasons, I am moving from the Arduino IDE to Xcode using the embedXcode plugin. The code in question compiles and uploads fine from the Arduino IDE, so I think the issue is related to ...
0
votes
1answer
40 views
Could you tell me what is wrong with this Arduino code ?
void fn( int pin, int pos)
{
Servo temp;
temp.attach(pin);
temp.write(pos);
delay(15);
temp.detach();
}
void loop()
{
int pos = 0 ;
for (pos = 0; pos <= 180; pos += 1) { // ...
2
votes
1answer
10 views
Arduino Servo Free Rotation
I have a project where I use 22 servos. I attach all 22 of the servos in the setup and in the loop , I use myservo.write() command to make a particular servo move to a particular position.
The ...
1
vote
0answers
40 views
3.95 MCU Friend Arduino TFT LCD flickering
I got the 3.95LCD from aliexpres which uses IL9488. I used https://forum.arduino.cc/index.php?topic=366304.msg2524865#msg2524865 library . I am using MEGA as I need other GPIO to be used for other ...
1
vote
3answers
69 views
What does “Arduino compatible” mean?
I wanted to buy an Arduino (ATmega) 2560 (8 Bit MCU) via Amazon. But there was no Arduino visible. There was only a
SainSmart 2560 and
SunFounder 2560
On both websides (SainSmart and ...
1
vote
1answer
28 views
Marlin Firmware troubles
I am trying to upload the Marlin Firmware to my 3d printer's Arduino Mega 2560 and I am experiencing a problem. It keeps saying
qr_solve.cpp:7:18: fatal error: time.h: No such file or directory
...
-1
votes
1answer
9 views
How to send a group message to multiple receivers using GSM900 and Arduino Mega2560?
I'm working on a project and it can send to one receiver only. What I need is to send a message to multiple receivers. I need a code sample that would satisfy my needs. Please help! I need to finish ...
4
votes
1answer
36 views
SD print in script works in setup but not loop
I am a bit of a novice with the Arduino, and have had to learn a lot for my High Altitude balloon launch. I am getting ready to launch this, but for some reason, my datalogger, printing to an SD card, ...
0
votes
0answers
26 views
Tips for not burning out my Ardunio Mega or catching something on fire when wiring a Prusia i3?
I'm reading about wiring up the electronic components to my Prusa i3 using an Arduino Mega 2650 and Ramps 1.4.
I have step sticks, a heated bed, and a Switching Power Supply 24V 400W (more details ...
0
votes
2answers
22 views
Handling double (8 byte) in Arduino mega 2560?
I am receiving 8 bytes from serial.
I want to convert and save in double variable.
This is how i tried.
union u_data
{
byte b[4];
double fval;
} u;
double BytesToDouble ...
0
votes
2answers
29 views
How to set address for using more than MPU9250
I am trying to build a project that contains more than one MPU 9250, until now I'm still confused to MPU9250. If I were going to that, does anybody here know how to set addresses to each of the MPU's ...
0
votes
1answer
29 views
Can I run a Mega 2560 on 14v?
I have a Mega 2560 with a ramps 1.4 shield. I noticed when I turn on the 14v power supply the mega would also power up and run.
Am I damaging it running it at 14v? If not is there a solder or jumper ...
1
vote
1answer
37 views
Arduino Mega 2560 not showing up in Serial Port in IDE
I recently purchased an Arduino Mega 2560. As soon as I connected it for the first time with my macbook pro the led was blinking (default blink program). To stop the blinking, I uploaded an empty ...
0
votes
1answer
18 views
Converting ASCII value to String
I have this code.
String incoming; // for incoming serial data
void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
}
void loop() {
// send data only when ...
0
votes
1answer
34 views
Supply arduino through Vin pin with a battery
is it dangerous for arduino the below circuit because GND pin is common with -12V battery pole?
is it dangerous for lots of 5v circuit to be grounded on -12v battery pole?
in case i don't connect GND ...
1
vote
2answers
74 views
Using more than 8 digits using the sevseg library
I am using sevseg and i can't get more than 8 digits to work. I really need 15. Does somebody know what I can do to get this?
Shown is the original example
This is using Gabriel Staples example in ...
0
votes
1answer
40 views
Migrating from ATMega2560 to ARM based — Teensy vs Due?
I currently have a project that is working on an AtMega2560 platform (heavily derived off the Arduino Mega). It mainly involves a GPS module and SD card.
Going forward I am looking to add a few more ...
0
votes
0answers
40 views
Serial Communication, Arduino and Rpi , C library
I am currently working on a project on serial communication between rpi and arduino, this is the code that I am using from Rpi Side it's in C :
int main()
{
//-------------------------
...
1
vote
0answers
19 views
Weird stepper motor behaviour on RAMPS in arduino
Following this tutorial:
http://www.instructables.com/id/Complete-newbie-step-by-step-3D-printer-with-all-p/?ALLSTEPS
I connected DVD stepper motor to RAMPS 1.4 on arduino with Marlin software with ...
0
votes
1answer
40 views
Array of Strings and Callbacks
I am trying to create an array of structs that contain pairs of Strings and Callbacks the problem I am having is assigning the callback function. I have the following code:
#define UI_ROUTINE_ITEMS ...
1
vote
0answers
17 views
Advices on domotic project improvement
Some months ago I developed a project for school where, by using Arduino and Raspberry Pi, I've created a domotic system. All the main features can be viewed in this video .
I don't know if I've ...
1
vote
1answer
51 views
Can I work with larger numbers than an unsigned long long in Arduino?
I would like to use larger numbers than an unsigned long long in Arduino. Is that possible?
-1
votes
0answers
31 views
GSM shield gives error message: “not connected”
I have an Arduino GSM shield connected to an Arduino (Uno and Mega) board. When I put my own SIM card, the connection works and the SIM card becomes available for use. I can call and send SMS to that ...
1
vote
2answers
156 views
Reset Arduino Uno R3 from Serial when it freezes (stops looping)?
I have an Uno that loops processing serial commands and reading from a DHT11 sensor. For whatever reason, the device often stops responding. I put an LED on a pin and gave it a blink to see whether ...
0
votes
1answer
35 views
Prevent Switch case from not being complete
I got this program. It controls a refrigeration room using a ds1280 temperature probe.
The thing is, sometimes the probe reach 7.00°C then the refrigerattion cycle start (refrigeration cycle is on a ...
0
votes
1answer
26 views
Eclipse add library
I am completely lost here, I have no idea what I am doing wrong. I am using Eclipse Mars using the Eclipse C++ Arduino extension. I am also using the COSA library, this is where the problem comes in. ...
0
votes
1answer
38 views
Arduino Mega, ST7920 using COSA
I am trying to learn and understand the COSA Library using a 12864ZW (ST7920) 128X64 LCD Display. Right now I am able to use the LCD using the u8glib but also found that COSA has a library for the ...
2
votes
2answers
65 views
Arduino Variable Data Type?
Is there a variable data type available for Arduino? I have a class that should have a member that will differ in data type, in the past I have used the "variable" keyword in c++ but when I tried to ...
0
votes
0answers
50 views
Arduino MEGA and ESP8266
Hi I am Using ESP 8266 to Send Serial Data To My Arduino Board using single click ( or post Action )..... My arduino mega controls 6 lights by reciving a character....
for example:
if i type 'U' in ...
2
votes
3answers
182 views
How many LED Strips can we connect to an Arduino Uno? Is there a way to connect 1-3 meters worth without needing extra parts (relays)?
I am looking at Adafruit to purchase some LED strips for a mod for my computer case, and want to power it with an Arduino.
I am looking at the Uno, but the Mega looks good too. I hear the Uno is ...
0
votes
1answer
19 views
Buying Arduino Parts Different Manufacturers
I'm looking to buy my first arduino kit. However I have a concern.
If my Arduino Mega is bought from one manufacturer, then can I buy shields or other parts from other manufacturers? Are there any ...
1
vote
2answers
53 views
How does this eBay relay board connect to the Arduino
I bought a single channel relay on eBay and besides the NC/COM/NO, it has six pins and a jumper.
It is not possible to see the labels on the image, but the labels are:
X X--X X X X
VCC -IN+ ...
1
vote
2answers
66 views
Problems with Draw Loop using u8glib
I am using an Arduino Mega and a 12864ZW LCD with the u8glib library and the following code to draw to the LCD:
U8GLIB_ST7920_128X64 Display(LCD_E_PIN, LCD_RW_PIN, LCD_RS_PIN, U8G_PIN_NONE);
void ...
0
votes
3answers
50 views
How to check if a pin is set from bank?
How would you go about checking if an input pin has been set using the entire bank? I am thinking that I need to use bit twiddling with a bit mask but I have not used this enough to figure out how to ...
0
votes
0answers
26 views
arduino mega2560 and zte mg2639 communication problem
I am using Mg2639 Zte and Arduino Mega 2560 R3. it doesn't communicate, while when i connect mg2639 to Arduino Uno R3 (without changing any thing) it works like a charm.
Some one told me it could be ...
1
vote
2answers
59 views
Arduino Mega2560 and Zte mg2639 RX / TX Issue
I am using Mg2639 Zte and Arduino Mega 2560 R3. it doesn't communicate, while when i connect mg2639 to Arduino Uno R3 (without changing any thing) it works like a charm.
Some one told me it could be ...
1
vote
0answers
16 views
Stepper Motor does not work with Arduino Mega Ramps 1.4 with Johnny-five
I have an Arduino Mega with RAMPS 1.4 shield board. I think I uploaded the correct firmware for the board (Standard Firmata and Advanced Firmata)
Here is my setting:
AC to DC converter
The board
...
6
votes
1answer
125 views
Event driven programming
I have ran across a couple of different event libraries that are available on the AVR and Andruino but I am not sure which one is the best option. What I would like to do is design my program in a ...
2
votes
1answer
54 views
Multiple servos noise
I'm building an application that uses 20 servo motors, and i control then with an Arduino Mega. The servos are having some instability, to the point where they make small random swings. Im powering ...
1
vote
1answer
35 views
Arduino using LCD
I am building a project that is using A12864ZW 128X64 LCD, the question I have is should there be anything in the circuit to prevent damage to the Arduino Mega or the LCD? I am using this example here ...
5
votes
2answers
119 views
OOP vs Inline with Arduino
I have been programming for quite a while now but I am new to Arduino and AVR Programming. The main question I have about programming these Micro-controllers is are there major differences in ...
0
votes
2answers
47 views
LED Control through bluetooth
I have an Android app that sends data to the arduino HC-06. It is however giving me colors i did not send to it. Eg. Red in place of green, white in place of red etc.
Here is a snippet of my android ...
0
votes
0answers
24 views
Unstable reading from Raspberry Pi
I'm trying to send a signal from Raspberry Pi GPIO to Arduino. I made a sketch that basically reads the state of the digital read, but the reading are very unstable. I understand that there is a ...
0
votes
2answers
29 views
Power maximum output power for each pin
A have Arduino Mega 2560. I found in the spec that the maximum output current for each I/O pin is 40 mA.
Can i use 40 IO in parallel? That's mean 40*40ma*5 volt = 8000 mw = 8 watt.
What about the ...
1
vote
1answer
353 views
Communication between two arduinos over wifi esp8266
I have two arduinos one is Arduino Mega while other is Arduino UNO and I want to send data from UNO to Mega and vice versa over wifi using two ESP8266 wifi modules without use of any router in ...
1
vote
1answer
35 views
Connect Antenna to GPS Module ET314AC
How can I connect antenna to GPS Module ET314AC?(it is not on a breakout board). I have an antenna like this one GPS Active Antenna and Here is the datasheet of ET314ACET314AC Datasheet.I want to ...
-1
votes
1answer
16 views
Mpr121 multiple using breakout
I try more solution but there are not working. i use adafruit mpr121 lib, sparkfuns solution but there are not working. Some solutions say, cut the addr socket but i am not understand. maybe you show ...
