All Questions
1,311 questions
1
vote
1
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182
views
AC/DC converter burns L7805 regulator, on lab supply it works fine
Controller
Myself and a friend are building a custom LED-strip Controller based on AtMega for a small customer. We have designed the boards and have had them produced by JLCPCB. Under laboratory ...
- 11
1
vote
0
answers
73
views
MCU data logger design without any power supply/batteries
Assume we are to create a simple MCU data logger that will record the amount of times the apartment door has been opened. Door has a small SPDT limit switch fitted, which pulls the pin of the MCU low ...
- 144
2
votes
1
answer
69
views
AVRISP mkII does not frees SPI after programming
I'm using a ATMega2560, and a FT812 Graphical LCD. Before my upgrade, I'm used USBASP and worked well. For some reason, I bought a AVRISP mkII. But I got a problem, the programmer does not frees the ...
- 131
3
votes
2
answers
303
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Will a ATmega328 work with a CMOS oscillator?
I got the following hardware:
ATmega328 and a Shenzhen SCTF Elec SX3M3.6864M20F30TNN as a crystal.
This should give me a 3.6864 MHz as I am thinking of using UART. Normally I would wire this with ...
- 41
1
vote
1
answer
133
views
Rotary Encoder Code Double Counting
I have successfully make my C code on Atmega328 to read my 2 rotary encoders.
(More details here)
I am having an issue with the encoder always incrementing by 2 sometimes 4. I'm not sure where the ...
- 59
0
votes
0
answers
152
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Rotary Encoders that share pins with LCD data lines
I am trying to modify some source code for this old digital power supply design
based off the original schematic.
The current schematic with the rotary encoders is this one:
https://drive.google.com/...
- 59
4
votes
2
answers
105
views
Is it possible for an AVR8X microcontroller (for example the ATmega3208) to measure its own supply voltage without using an IO pin?
In earlier models, for example, the ATmega328, it was relatively simple to measure our own supply voltage: set the voltage reference of the ADC to external VCC, set the multiplexer channel to the ...
- 2,644
0
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1
answer
130
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Leveraging the ability of AVR microcontrollers to self-program [closed]
I am planning writing an elaborate swarm-like (8-16 chips with no common bus to speak of) solution. Given that I plan on storing 3k of data (considering implementing compression) and need some clarity....
- 13
0
votes
0
answers
57
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Decoding of 1-wire communication with the boiler controller
I need support in decoding the communication of the boiler controller.
I set as a goal to extend a simple controller with my own design. Unfortunately, I have fallen on a rather simple issue and have ...
0
votes
1
answer
68
views
SSCOM Displaying Garbled Output when Transmitting data from an ATMega328P via USB-TTL
I have been tinkering with an ATMega328P trying to figure out how to use the different functionalities because i need to use it for a school project. i'm currently trying to figure out the usart part. ...
- 3
1
vote
4
answers
230
views
Atmega328p stops mid instruction when in interrupt
I want to make a basic temperature/humidity/CO2 controller with a SDC41 sensor and i want to use an INT0 interrupt to switch from normal controller mode to menu mode to change set values. When i press ...
1
vote
3
answers
244
views
AVR Atmega328p - Split data into two port registers
I'm trying to split data into two port registers on an Atmega328p.
because i need to avoid using PD0 and PD1 (using tx and rx on an arduino) and also PB6 and PB7 (connected to oscillator).
so i wanna ...
- 39
0
votes
1
answer
97
views
RGB LED audio meter
I'm planning to build an audio meter using ATmega328 chip and 2 RGB LEDs for both stereo channels. The color of an LED will be dependent on the level of the signal flowing to chips ADC.
I'm also ...
- 315
2
votes
2
answers
149
views
Information needed about Atmega8 development board
This is the image of the dev board consisting of an Atmega8-16PI chip and an L293D motor driver chips .It was was given to me by a friend and I am really curious on how to use it but I didn't find any ...
- 21
0
votes
2
answers
143
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Replace the Atmega16U2 on the ArduinoMega2560 with Arduino ISP programmer?
I'm working on a custom ArduinoMega2560 and I was wondering if I could replace the 16U2 with the Arduino ISP https://docs.arduino.cc/retired/boards/arduino-isp/ (it's cheaper and simpler).
Does this ...
- 1