Questions tagged [atmega2560]
Low-power 8-bit AVR microcontroller with 256kB flash.
96
questions
0
votes
0answers
30 views
Using SMS to receive password, then to choose whether to turn the relay on or off
I'm trying to use SMS messages to turn a relay on/off but before doing that i need to have a password system before allowing the user to turn the relay on/off. Basically, you have to send the password ...
0
votes
1answer
31 views
How can I make a Parallax Servomotor move a water tap correctly and prevent from vibrations?
I am using Arduino Mega 2560
I have built an structure with plastic 3D pieces to move this water tap.:
I am using the "Servomotor Parallax Inc 140 mA, 4 6 V" to rotate the tap:
Some more images to ...
2
votes
2answers
65 views
Arduino Uno lag in simple loop
I have a simple Arduino sketch which I have been playing with on my Uno.
The idea is simple, the user turns a potentiate (pin A2), when they pass a certain threshold a LED is turned on (pin 7).
Here ...
0
votes
2answers
44 views
Is possible use Macro F() with Integer and Other types of variable?
i have a sketch that is using very memory RAM of my Atmega2560 (is a giant project), and i need use various "println" because i have a TFT screen and i need to show data on the screen to user see. So, ...
0
votes
2answers
59 views
Will bootloader communicate via TX0 / RX0
I'm fairly new to Arduino programming but have a good deal of experience with low-level programming early processors, having originally cut my teeth on Z80, 8088, etc. I'm looking at developing a ...
0
votes
2answers
27 views
what will be the sampling frequecy of my arduino Mega 2560 code. How would I calculate it?
void setup() {
// initialize the serial communication:
Serial.begin(9600);
pinMode(10, INPUT); // Setup for leads off detection LO +
pinMode(11, INPUT); // Setup for leads off ...
0
votes
1answer
56 views
ADC register always returning high
Regardless of whatever voltage at A0, the software is always returning high (1023)
volatile unsigned char* ADmux = (unsigned char*) 0x7C;
volatile unsigned char* ADCSRa = (unsigned char*) 0x7A;
...
0
votes
1answer
59 views
C++ State Machine / Wpmf-convesion
I'm quite a newbie using C ++. I am trying to implement in C ++, the state machine described in this link for C language:
https://barrgroup.com/Embedded-Systems/How-To/Coding-State-Machines.
I have ...
0
votes
0answers
60 views
Arduino code does not function when relays are powered
I have a mega arduino, which is supposed to to power 4 relays using 4 touch sensors TTP 223, the relays are 5V coil and 220V. the arduino is powered by a 5 V adapter "mobile phone charger" and it ...
0
votes
0answers
17 views
An Error while uploading the sketch [duplicate]
I am getting the error, unable to fix it. I have Arduino mega2560 board which is showing the error. and also When connected both the LED's are continuously in ON.
But it is showing in device manager ...
0
votes
1answer
48 views
Floating power supply for Arduino - Is it still connected to the USB ground?
I am trying to power my Arduino Mega 2560 from a benchtop power supply. I plan to essentially feed in a 9V supply directly on the Vin pin and connect the GND pin to the floating ground pin on the ...
1
vote
0answers
50 views
Advice needed for powering Multiple HX711 with Arduino Mega
I have a project where I need to use multiple load cells (6-8), with individual HX711 for each load cell, which need to be powered simultaneously. I am not sure if I can power all the HX711 with 5V ...
2
votes
1answer
126 views
I2C communication between arduino and raspberry pi breaks under stress for unclear reasons. Why?
I am having a behavior I cannot explain while using arduino mega as a I2C slave for a raspberry pi master.
I am showing here an idealised program that shows the issue. I experience pretty much the ...
0
votes
1answer
37 views
Concern myself with current draw from digital pins used as INPUT with internal pullups?
My project is using a genuine Arduino Mega 2560, probably 3-4 yrs old since purchased (I don't see any revision numbers on the PCB). It's being used to read a lot of switches, buttons and drive some ...
1
vote
1answer
73 views
How to count the number of rising edges on DS3231 rtc?
I am using a DS3231 rtc and I would like to get millisecond accuracy from it so I decided to use the 32kHz generated clock from it. I wrote a code that would count the rising edges or falling edges ...
2
votes
0answers
88 views
How to wake up Arduino with an rtc?
I am doing a data logger with an Arduino Mega2560 and I want to use a code to make it sleep when no measure is needed and wake it up with an RTC when time comes. The reason I want this is because I ...
0
votes
1answer
40 views
Why is Serial Print causing different behaviour based on where its located
Im trying to test out these two motors I have where I need to call a function from the loop. I only want to call this function once so I made a quick little if statement to have the program only run ...
1
vote
1answer
74 views
Set PWM by period? And have it variable?
In this other stack QA I'm asking about generating a pulse signal with a period ranging from 63 ms to 6.5 ms. There is a popular PWM library however it doesn't compile and also since 63 ...
0
votes
0answers
255 views
OneWire with DS18B20 digital sensor only works on the I2C (20 and 21) pins of my Mega?
I am using an Arduino Mega to read a DS18B20 temperature sensor using the OneWire library in the code below which I got here:
#include <OneWire.h>
#define DS18S20_Pin 20 //DS18S20 Signal pin ...
0
votes
1answer
50 views
Maximum sampling rate of Arduino Mega2560
I'd like to know what is the maximum sampling rate achievable while using ADC on Arduino Mega2560.
Thanks
1
vote
1answer
35 views
Serial Port fails with speeds greater than 19200
In Arduino Mega 2560 R3, properly selecting the Serial Monitor bauds, this code works with #define R 38400, but for some reason, not with #define R 19200 (?),
#define R 38400
int rate=R;
...
0
votes
1answer
28 views
Velleman KA02 not working on Mega 2560 r3
I have a Velleman KA02 audio shield. When I use this shield on an Arduino UNO R3 with this sample code, it works. And by "work" I mean when I interact with the Serial Monitor (by pressing Y, for ...
0
votes
0answers
44 views
Programming AFE4404 using Arduino mega2560
I'm facing difficulties programming an AFE4404 using the arduino mega2560. I'm using AFE4404 I2C to program it. I tried most of the code I found online with minor changes to get all the LED and ...
-1
votes
1answer
30 views
Controller freezes
I am using atmega 2560 as main(master) controller and other 5 salve 2 atmega 8 and 3 atmega 328p, there is two device with analogue output connected to main controller atmega 2560 through ads1115 ...
0
votes
2answers
63 views
Rubber keypads and DC motors & LCD on Arduino Mega2560
I'm quite a newbie to Arduino and hardware & circuit board stuff, so please forgive me if you feel my questions are too stupid. Recently, I'm working on an assignment which I have to reconstruct a ...
0
votes
0answers
44 views
MEGA2560 only starts program after pressing RESET button multiple times
I am working on a program where I am controlling an MP3 player by using UART between my MEGA2560 and the MP3 player. The MEGA2560 sends serial commands to the MP3 player when external interrupts are ...
0
votes
1answer
103 views
Adafruit Micro-SD breakout not initializing on MEGA 2560
]
[I am having quite a bit of trouble trying to get my Arduino MEGA 2560 to read my micro-SD card. My wiring is as follows:
Breakout Arduino
5v 5v
Gnd Gnd
CLK 52
DO ...
0
votes
1answer
87 views
How can i stop DC motor when button on remote is released? [closed]
I am trying to control a motor using a remote with Arduino Mega. The motor turns on when I press the button on the remote but when I release the button, it continues to move. Does anyone know how to ...
0
votes
1answer
146 views
Help understanding how avrdude works with ArduinoISP and why its not working for me
I am trying to use avrdude with a Mega2560 running ArduinoISP
Note: I have the 10uF cap on the Mega2560 RESET line as described by Ardunio.
Also, I am using avrdude/6.3 on Windows 10. The Mega2560(...
0
votes
0answers
32 views
Min/Max current for supply input of mega2560
What is the min and max current the mega2560 can take for the 5v supply input voltage of the chip itself, not just the arduino mega?
1
vote
1answer
56 views
Switch statement cases not executing
Overview:
I am trying to use a switch statement to run different tests. A main menu is displayed on the serial monitor, and then the user is given the option to enter their menu choice in the serial ...
0
votes
0answers
21 views
Arduino Swarm - WiFi and Embedded Communication
I'm developing an Arduino-based swarm, each bot having 1 ATMEGA2560 as its main processor and 1-2 ATMEGA328 as sub-processors and a variety of sensors and actuators, with WiFi (LAN) connection in a ...
0
votes
2answers
52 views
How can I discard power from a device I want to read from?
I want to read the data line from a device that normally interfaces with a controller. It has 3 pins, 3.3v power, gnd, and data. I don't need the power line since the Arduino will be USB powered and I ...
2
votes
1answer
245 views
Ardunio Mega/ATmega2560: Using Port F or K for both analog inputs and digital outputs
On an ATmega2560, can ports have some pins used for analog inputs but others as digtial i/o? Specifically, I only need to use 3-5 analog inputs but have many digital inputs. I would like to use the ...
0
votes
2answers
423 views
Will a 12 VDC 1A Power Supply Adapter supply too much power and damage an Arduino Mega 2560?
The specs shown here:
show that it has 54 digital pins with each outputting a DC current of 20mA which makes it 54 * 20 = 1080 mA
Plus the DC current of the 3.3V Pin of 30mA we get a total of 1110mA....
1
vote
2answers
73 views
Matrix keyboard and 7segment display countdown combination
I'm working on an escape room for my university with an Arduino Mega.
The last part consists of a 7segment display representing a time countdown, and the participants have to introduce the correct ...
0
votes
1answer
81 views
Converting code for ATTINY85 to ATMEGA2560. Pin change interupts
I have code that compiles correctly for an ATTINY85 board using the ARDUINO IDE but I don't have an ATTINY85 board. I have an Arduino Mega ATMEGA2560 and when I select this board in the Arduino IDE ...
0
votes
2answers
1k views
Parse a large json response with ESP8266
I'm doing a project where my Arduino uses an external ESP8266 wifi module (with AT firmware) to send http requests and receive server response.
I'm trying to get an NBA scoreboard, and here's what my ...
0
votes
0answers
103 views
EEPROM.read data not comparing with DHT11 sensor value - Arduino temp controller
I'm using a DHT11 to read temperature to control a relay that will control a fan. When 'A' is pressed it allows the user to update the temp value that the relay will go HIGH at. The value is being ...
0
votes
1answer
1k views
How to program the Robotdyn Mega 2560 PRO MINI?
I want to program the Robotdyn Mega 2560 PRO MINI which has no USB port.
How do I connect the pins to an FTDI?
Which setting do I have to use in the Arduino IDE?
0
votes
0answers
83 views
Sketch works on MEGA 2560 timer2, but does not work on timer1
I set the PWM frequency on MEGA 2560 like this:
TCCR2A = 0;
TCCR2B = 0;
TCNT2 = 0;
TCCR2A = _BV(COM2A1)
| _BV(COM2B1)
| _BV(WGM20); ...
0
votes
2answers
312 views
ATmega 32A and 2560 R3 register to pin mapping?
I've been doing research for the last few hours trying to determine the mapping of physical pins to memory-mapped I/O registers for the Arduino Mega board (which is an ATmega 2560 R3).
My code is on ...
1
vote
1answer
1k views
SOLVED: Strange phenomenon with avrdude: stk500v2_ReceiveMessage(): timeout only with ATmega250 on windows 7x64
I know this problem has been reported multiple times but in my case I think there is a different light on it.
My desktop is a w7x64 box and I also have a notebook with w10.
Both system have the ...
0
votes
1answer
55 views
Arduino Nano, Uno and Mega - XBee connection difference
I have a simple sketch working on arduino Uno and Nano sending data using an XBee.
However, if I run the project on an Arduino Mega it does not work.
What differences between Uno/Nano and the Mega ...
0
votes
0answers
29 views
Why is arduino Mega2560 taking so much time to recognise the pin is no longer at HIGH? [duplicate]
I am in my first arduino steps. I have a Mega2560R3 I wrote this code
const byte D0 = 22;
const byte D1 = 24;
const byte D2 = 26;
const byte D3 = 28;
const byte D4 = 30;
const byte D5 = 32;
const ...
0
votes
0answers
359 views
How to use watchdog timer for the purpose of recovery from failures in Arduino ATmega2560
Here is my tool-set;
Visual Studio with plugin called "Visual Micro"
Flashing the HEX file using Atmel Studio.
via AVRISP mkII
on ATmega 2560 MCU
And my simple trial code (I have also some others).
...
0
votes
1answer
51 views
Which board's bootloader is on the microcontroller?
Currently I'm doing a project that needs an Atmega2560 standalone MCU. After I burned the bootloader with this method: http://www.gammon.com.au/bootloader . I set the Board as "Arduino/Genuino Mega or ...
0
votes
1answer
152 views
Receiving junk values in Arduino serial monitor console
I want to send a character from a Zigbee transmitter to an Arduino Mega 2560. After the character is received, Arduino should send some data back to Zigbee. But Arduino is always receiving junk values ...
2
votes
1answer
369 views
Trying to run Timer1 in ATmega2560 with assembly
I have a slight problem with Timer1 in arduino (ATmega2560) while coding it in assembly. I try to run the Timer1 in CTC mode - I configure everything well in my opinion, but the TCNT1 just doesn't ...
0
votes
1answer
52 views
What are the negative PINs for on the IndustrialShield M-Duino 58 Analog
I am working as an internship on an Arduino based PLC. It is the M-Duino 58 Analog from IndustrialShields. I try to figure out how it works; Reverse Engineering. But i dont know why it has negative ...
