We’re rewarding the question askers & reputations are being recalculated! Read more.

Questions tagged [atmega328p]

This tag should only be used with questions about the ATmega328p microcontroller. Questions about other ATmega series MCUs should use the tag "atmega", and those about the use of the ATmega328p within the Arduino UNO should use the tag "arduino". It is acceptable to use this tag with specific variants, like the ATmega328, ATmega328P-PU, etc.

Filter by
Sorted by
Tagged with
1
vote
2answers
597 views

how to choose the right pullup resistances for i2c lines with multiple slaves

In my project I have connected multiple sensor breakout boards to a Arduino-proMIni running at 3.3V and 8Mhz as follows on a fabricated pcb but preserving the original board layouts (so that I can ...
0
votes
1answer
186 views

ATMEGA328P standalone sketch doesn't work as expected

As I finished programming the MCU in the Arduino Uno board to receive some RF Signal and drive relays, I moved it into a standalone board I made with Eagle. The circuit is pretty basic, the MCU ...
3
votes
2answers
169 views

Direct port manipulation gives random result: Delay necessary?

Setup (Arduino Pro Mini ATmega328p 16MHz, 5V, no pin connected): When called from the setup(), this works: ...
1
vote
4answers
3k views

Is power cycle reset different from reset pin reset?

I am using custom built arduino uno for a home automation project. Sometimes, the arduino locks up due to electrical noise or sparks in the ac lines. More details here. I tried conducting some ...
2
votes
2answers
752 views

Help connecting custom ATMega328PB using serial FTDI

I built this ATMega328PB circuit. It runs at 3.3v from 1.5v battery using booster and 8MHz from external resonator (CSTCE8M00G52A-R0). Using USBTinyISP I set fuses: Low-FF (for 8MHz), High-D8 (Boot ...
1
vote
1answer
156 views

Is it the right use of the RTC RV8523 to wake up an atmega328p?

I'm using the RV8523 to wake up every 2 minutes an arduino atmega328p. The rtc is wired like this : Where INT1 is wired to Port D pin 3. The internal pull up resistor is activated and yet it's ...