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Questions tagged [atmega328]

The ATMega328 is the chip that is the heart of the Arduino Uno. It is popular also as a chip to use to create your own board. Since it is available in the through hole version, it can be placed on a breadboard easily for circuits.

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freeRTOS tasks never run on Lightblue Bean

Although Punchthrough no longer supports the Bean and Bean+ they still maintain the online compiler and reference materials: Bean Github Bean reference One of the external libraries they've included ...
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26 views

Mistaken Connect 5V to SCK Pin

i have old chinese old hotair station that controls by atmega8l 8ua chip.. and the board designer are clever enough to put 2 identical dc plug, 1 is 5v supply cable.. the other one is on off switch ...
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18 views

Bit Number to Byte Value conversion (AVR Docs)

I have hard time to understand what this doc tells me: https://www.microchip.com/webdoc/AVRLibcReferenceManual/FAQ_1faq_use_bv.html I has a macro called _BV that convert a bit number (usually ...
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39 views

I am getting expected unqualified id before if [on hold]

#include <IRremote.h> int IRpin = 11; IRrecv irrecv(IRpin); decode_results results; int Relay1=4; // Initializing the pins for Relay int Relay2=5; int Relay3=6; int Relay4=7; int ...
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46 views

What configuration is needed to use an ATMega328p micro-controller on a breadboard [migrated]

I previously bought an Arduino Uno that came with a store bought/prebuilt PCB and ATMega328p to program it and use the pins. I also have a second ATMega328p that was bought by itself and I ...
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20 views

Atmega328p and cp2102 with error avrdude: stk500_getsync(): not in sync: resp=0x00 [closed]

I recently bought a usb/ttl cp2102 converter for testing with a standalone Atmega328p, I made the DTR connection with the pin 1 in the Atmega using a ceramic capacitor of 0.10uf (104) so that when I ...
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2answers
30 views

Arduino nano / uno analog pin

I'm working on a project where I need 7 analog pins. I read the datasheet of Ardnuino Uno : 6 analog pins available. So I decided to use an arduino mega with 16 analog pin available. Then I saw the ...
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Moving timer-related code into a separate file causing timing inconsistencies?

I have written the following code, attempting to re-implement the Arduino micros function: main.c #include <avr/interrupt.h> #include <stdbool.h> #define CLOCK_CYCLES_PER_MICROSECOND (...
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32 views

Arduino Nano v3 not being detected at any COM ports

My Arduino Nano v3 is not being detected anymore at any COM ports in Arduino IDE 1.8.9. There are 4 LEDS onboard; RX, TX, Power and L. The first 3 LEDS are always on. The L one stays off. After some ...
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35 views

Clear Timer on Compare or CTC in ATmega328P, Toggle OC0A on Compare Match

I want to use the CTC on the ATmega328P to play same notes with a speaker, a project that I find in this book. In the data sheet I read: For generating a waveform output in CTC mode, the OC0A ...
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15 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 ...
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23 views

Is it possible to send data at 100Hz using Wifi bee ESP V1.0 to Mobile (Xamarin)?

Im currently using WifiBee ESP V1.0 and Lilypad Arduino as well as AD8232 for ECG. We are trying to send the data to mobile phone by connecting to PubNub.` if(Serial.available()>0){ str = Serial....
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1answer
40 views

Arduino as ISP - program is being uploaded on Arduino, not breadboard

I am following this tutorial, and have wired Arduino using this diagram: This is what it looks like: These options are selected in Arduino IDE: This is the program I'm uploading: // the setup ...
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35 views

Why can you use FTDI with an ATMega328 with no external crystal?

I have read that serial (UART) communications are unreliable or will not work when using the 8MHz internal oscillator as the clock source. For example here are two results from a quick google. http:/...
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29 views

Using a 48 characters char[] for PROGMEM

I am trying to create a charliplexed display of 6x8 LEDS using a Arduino Nano with the ATMega328p chip. Because of the limited storage I am trying to use PROGMEM. I did my research and found some ...
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47 views

Force TCNT to stay below OCRxA on ATmega328P

I'm using a timer and the TIMERx_COMPA ISR to generate a signal in "the background". This ISR is triggered when the timer reaches a certain value (OCRxA), which in turn can be changed by the user. ...
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2answers
58 views

Arduino and Solenoid Water Valve

I use Arduino UNO and two SPST Relay (Wemos Mini D1 Relay) to make the reverse polarity circuit. I use this circuit to open and close the Solenoid Water Valve (SWV), which work with 9 to 12 volt. The ...
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46 views

What does “Update of OCR1x at” mean in the WGM table of ATMEGA328?

I just finished a reading a couple of online guides on how to use timer registers with pulse width modulation, so I'm still new to its concept. When I looked in the ATMEGA328 specification sheet, I ...
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1answer
68 views

Arduino New Optiboot Bootloader on custom ATMega328p board, ATMEL Studio and AVRdude [closed]

I am about to ask a kind of complex question due to the number of system parts involved and the system architecture I am planning to use. First of all I have a tiny bit of experience with the Arduino ...
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23 views

BLUNO Beetle V1.1 BLE seems defective, Bluno Beetle V1.0 works fine

I have previously had the Bluno beetle V1.0 before which works fine. I have just bought 3 Bluno Beetle V1.1 mc's, but the BLE is not discoverable. I have gone through the same process to update the ...
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Installed configuration won't show up on Board menu

So I was following these instructions on the official site. Download this hardware configuration archive: breadboard-1-6-x.zip, Breadboard1-5-x.zip or Breadboard1-0-x.zip depending on which IDE you ...
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1answer
73 views

Uploading bootloader to ATMEGA328 P

I have a duemilanove which originally had a 168. I have some ATMEGA328 P chips and I've put one into the duemilanove. I am using a Uno as a programmer for the duemilanove. I am running Arduino 1.8....
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64 views

Measuring battery voltage [closed]

I am trying to use this way to measure my battery voltage at least approximately, but I am getting weird results. I am running breadboard atmega328p with internal 8 MHz and powering it from a LiPo ...
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146 views

ATMega328 AU bootloader burning issue using Nano

We are trying to burn bootloader into ATMega328P-AU SMD. We have taken the reference of the link and did the same. We checked wire connections and all looks fine and we tried with two chip with two ...
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2answers
1k views

Run code once after programming

I'm using EEPROM to store project settings non-volatile. After reuploading the sketch to my board (over SPI via ArduinoISP), the EEPROM is reset to full 0xFFs and I have to manually do a "software ...
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0answers
43 views

Multiple Atmega328p wired communication

I am using multiple ATMEGA328Ps (4 ATMEGA328P) (OR Arduino Unos). The distance between two farthest ATMEGAs is 14 meters (One is Master Device and Other is Node), and other 3 are connected to each ...
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1answer
39 views

please help with my arduino

My problem is when I run code like this: char directioN; void setup() { Serial.begin(9600) } void loop() { if (Serial.available()) { directioN = Serial.read(); switch (...
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0answers
17 views

My ArI was using a potentiometer and the system shorted maybe. Do I have to replace the USB interface chip? It doesn't reset also

See I was using a micro analog rotary potentiometer to control a servo. The pot was in a pcb. The 5v output and gnd were connected to arduino from the pot. The third pin and 5v got touched and it got ...
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19 views

How can I merge my two scripts: Basketball Timer & Basketball Scorer?

I have a project in arduino, an arcade basketball machine using 4" Single-7-Segment Displays driven by IC 74HC595N. The purpose of my program is to record the score by merging 2 SSDs at the same time ...
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1answer
98 views

Arduino hangs after some time

I am using Atmega328p with 5V power supply, My Arduino getting hangs [or auto restarts] after some times. I am using libraries: Wire.h CRC32.h EEPROM.h Arduino.h TimerOne.h RtcDS3231.h ...
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30 views

Making a ATMega328P-PU and computer communicate but not by standard serial communication

So i have been trying to make a ATMega328P-PU using the Arduino bootloader and a computer communicate the same way brands like Logitech and Razer makes their mouse's and keyboard's communicate with ...
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1answer
82 views

Arduino Program Memory Ran Out

I have a Arduino sketch I made and I have run out of dynamic memory on my Arduino Nano. How could I possibly reduce the amount of memory the program takes? (I'm not that good at this stuff) P.S: The ...
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1answer
156 views

error 404 in HTTP GET request with Arduino Uno and ESP8266 using AT commands

when I try to send http get request I get error 404 AT+CIPMTX=1 OK AT+CIPSTART=4,"TCP","alirezaabrhshami.ir",80 4,CONNECT OK AT⸮⸮R5U9⸮⸮b⸮⸮j OK > Recv 47 qytes SEND OK +IPD,4,223;HTTP/1.1 404 Not ...
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32 views

Programming an EL Sequencer

I have a EL Sequencer and FTDI 5V breakout board. I have been have been unable to program it. All my attempts get some variation of "programmer is not responding". I was using these instructions as ...
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1answer
53 views

ATMEGA 328P Standalone on 3.3v controlling a servo

I'd like to use an ATMEGA 328P on standalone mode powered by a 3.3V supply source to control a servo (which is powered by 4 AA batteries, resulting in 6V). My question is: do I have to convert the PWM ...
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1answer
78 views

NRF51822 ± Arduino Uno / ATmegaXXX?

Hello I want to make a simple home automation project and I'd like to use an arduino uno for prototyping and later a atmega for deployment. I need some sort of a mesh communication method. I was ...
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2answers
103 views

Arduino write to memory and self shut down (over MOSFET) - An idea help

i would like to ask you for help with design of an circuit. I have and atmega328p, with detection for voltage on its Vin (Vcc). I have made and voltage divider and its output i connected to Analog ...
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1answer
62 views

Dimmer.h issues with ATmega 128

I am using a ZCD circuit controlling a TRIAC. Now I am using Dimmer library for this purpose. It works fine with ATMega 328 but whenever I try to upload the code in ATMega 128 using Arduino IDE this ...
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1answer
140 views

Standalone 328P Arduino

I am creating a standalone Arduino using Atmega328P. The circuit is below. However, I'm seeing avrdude: Device signature = 0x000000 error whenever I try to burn the Arduino Uno bootloader. I'm ...
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1answer
284 views

ESP8266 Software serial to ATmega 328 is not properly working

Thanks in advance.. We are having esp8266-12E chip and Atmega328 connected as follows, ESP 12 pin as Tx,13 pin as Rx && Atmega328 13pin as Rx, 12pin as Tx. Everything works fine, but while ...
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1answer
90 views

USART, SPI or Bit-Bang for the continuous transfer of bytes without inserted extra bits

I have heard that The SPI hardware introduces a 9th, HIGH bit between bytes USART still uses start and stop bits when in synchronous mode Are both these statements true? Can I modify the built-in ...
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1answer
72 views

Burning bootloader

I'm using arduino atmega 328p and currently using on custom PCB I programmed using the arduino board and take the IC and migrated to my custom PCB currently the program run well on the arduino board ...
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3answers
506 views

Atmega328p - Going low power 1.8V using 4Mhz oscillator - Bootloader flash

I would like to use an Atmega328p micro-controller with a 4 Mhz oscillator in order get some low power consumptions. I am using an Arduino board to flash the bootloader into the Atmega. EDIT In ...
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1answer
81 views

How to upload program to custom arduino board without USB FTDI and making it read only? [duplicate]

If I was to mass produce a microcontroller board I have designed based around the atmega328 (very similar to an arduino uno) but for one embedded task where I want one program only to be stored on it. ...
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1answer
508 views

How to interface USB to custom Arduino Uno Schematic and programming atmega?

I'm fairly new to designing schematics and working with the atmega on its own and I'm designing an arduino schematic on eagle. Ive gotten to the stage where I need to incorporate a TTL USB interface ...
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2answers
149 views

freeMemory() function from memoryfree library not returning decreased value in arduino UNO

I burned the code written below, I expect that as we declare the local variable in the loop, freeMemory() function should return decreased value. But it remains constant..! please explain why..? The ...
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1answer
29 views

MemoryFree library showing Irregular Behaviour..!

I simply burned the code written below but it is showing me irregular behaviour.. as in output's last paragraph, free memory increases after a runtime allocation, how it is possible? The output is ...
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4answers
148 views

Where in datasheet is the warning about unreliability of reading PINxn?

I use atmega32u4 (but believe it applies to all models). Here is the datasheet. Consider the following C program (I use AVR-GCC 5.4.0): #include <avr/io.h> int main(void) { PORTB |= 1 <&...
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1answer
158 views

stk500 getsync() attempt 10 of 10 atmega328pu [duplicate]

I've been getting this very common error on my atmega328pu circuit. avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x83 Some things ...
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1answer
266 views

DHT11 Sensor : Stand-by or Shut down?

I have an ATmega328P monitoring room temperature and humidity. It is enough for me to monitor every 8 seconds. In these 8 seconds, I am putting my Atmega to sleep. Now , I want to know : Does ...