Questions tagged [oscillator-clock]
Refers to a crystal oscillator.
82 questions
0 votes
0 answers
74 views
ASync Timer2 based OSCCAL value
How to calibrate the internal RC oscillator off of a 32768 Hz crystal serving Timer2? void OSCCAL_calibrate(void) //This version specific to ATmegaXX8 (tested with ATmega328) { unsigned char ...
- 136
0 votes
1 answer
86 views
If I use clock_prescale_set in my sketch I will loose access to adafruit feather 32u4?
I want to run my 32u4 in 2MHz. According to gammon I will gain 4mA in runtime. To my understanding this changes all the buses speed like UART, USB?, I2C?** and SPI?*. Probably I will have problems to ...
- 15
-1 votes
3 answers
219 views
Arduino Nano timer drifting
https://youtu.be/oVZgFsWsKPM][1] I'm a beginner in Arduino. I made a 12-hour common cathode 7-segment clock. I made a 7-segment display with LEDs, using Arduino Nano. If I use a long period of 1,000 ...
0 votes
1 answer
151 views
Programmer vs target clock frequency
I have a 16u2 programming a 1284P for a custom board I am building. The 16u2 converts USB to USART for programming the 1284P, however the 16u2 has a maximum frequency of 16MHZ while the 1284P has a ...
- 113
1 vote
0 answers
141 views
Deciphering AD7730 outputs
I am currently working with a AD7730 chip for analog-digital conversion. The chip is programmable, and I have been pulling code from GitHub as well as other links. I am unfamiliar with SPI (the ...
- 119
1 vote
2 answers
5k views
How to use an external 32kHz crystal for ESP32 S3 with Arduino IDE?
I want to use an external 32kHz crystal for RTC with ESP32 S3, but I didn't see any example or tutorial for Arduino IDE, Even when I asked ChatGPT, it gave me some example but the code gave library ...
- 297
0 votes
1 answer
58 views
Frequency problems with DIY arduino and resonator
I made a simple music program using an arduino Uno and the tone() function. It works fine. I decided to build my own circuit using a barebones AVR and upload that program. I did not know exactly what ...
- 1,435
0 votes
2 answers
370 views
How to divide high input frequency by 1.25 like old-school TTL logic by Arduino?
In modern timekeeping, there is a 10 MHz reference frequency (or any power of 10). The digital clock takes 32768 Hz frequency only (or some other power of 2 possible). The problem is how to convert ...
- 11
5 votes
0 answers
2k views
How to set ESP32 RTC clock source
According to the manufacturer's link below, the default RTC timekeeping in the ESP32 is supposedly based on Internal 150 kHz RC oscillator. Apparently, there is another option called Internal 8.5 MHz ...
- 407
0 votes
2 answers
318 views
slower clock frequency than expected on attiny202
I am programming an attiny202 which as per datasheet can run up to 20Mhz, but after compiling/uploading this simple code to the attiny202 and watch the PA2 pin on the oscilloscope, I see that the pin ...
- 103
0 votes
1 answer
1k views
Atmega 328p at 3.3v : Internal vs external oscillator
I am currently working on a pcb that uses smd atmega 328p (au). I will be powering it through a lipo battery and a ldo regulator for 3.3v input. I am using the multiwii flight controller code. I know ...
- 57
13 votes
1 answer
2k views
_delay_ms() is much slower than expected (by a factor of 6) on TinyAVR 0/1 (ATTiny1604)
I designed a custom AVR development board using the Atmel ATTiny1604 microcontroller. It belongs to the new Tiny-0 family, due to its recentness, some required changes to relevant toolchains have yet ...
- 439
0 votes
1 answer
165 views
Achieving nanosecond accuracy with MKR Vidor 4000
Can I achieve nanosecond accuracy with Arduino Vidor MKR 4000? Has anyone experience? Obviously by using the FPGA it has on it. I do not find much support on this module on google search...
- 127
2 votes
0 answers
112 views
Clock Problem when Migrating from Arduino IDE Mighty Core to Atmel Studio
I've been programming an ATMega1284 using the Arduino IDE with the MightyCore package. I'm now trying to migrate to Atmel Studio. Atmel Studio (7.0) will now compile the sketch and all required ...
1 vote
0 answers
179 views
Clocking issues while programming ATMEGA32U4-AU via USB bootloader
Hi, I'm designing a custom board with the ATMEGA32U4, with a GPS receiver and LoRa radio and it is powered from a LiPo battery. Since I'll need to make hundreds of this board later on, I'd like to ...
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