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Each analog read takes 13.5 analog clock cycles so you need a 67.5 kHz (or faster) clock to meet the chip's minimum speed of 5 kHz. The analog clock is derived from the system clock with a pre-scale of 2, 4, 8, 16, 32, 64, or 128. I would try a pre-scale of 128 for 125 kHz.
The reason I'm interested in dropping the clock frequency of an Arduino Uno to 8MHz is to allow operation down to 3.2V. I want to run between 3.2V - 4.8V because that's the range for the SIM900. It seems like this could be easily done by changing the CLKPR register at runtime. Why does this thread warn that I'd need a new bootloader, however?
To accommodate such devices, you can adjust the data rate. In the Arduino SPI library, the speed is set by the setClockDivider() function, which divides the controller clock (16MHz on most Arduinos) down to a frequency between 8MHz (/2) and 125kHz (/128). Arduino SPI reference SPI.setClockDivider().
Hi, I've some questions about relationship between SPI speed and Arduino uni / nano speed. My questions: A: Regarding SPI What is the speed of SPI if I have Arduino Nano @16MHz ? If the speed; for example 15MHz, what should be the SPI speed ? In the datasheet; does Fosc mean the actual oscillator speed or the system speed ? Like in SPISettings class, what does the clock mean? The 16MHz or the ...
Hey folks. I'm running an Arduino Uno controller with an adafruit motor shield attached, used to control a 200 step, 2 phase stepper motor. The motor runs on 12v, 0.3amps, and it is drawing this power as it should be. We've had no problem running other stepper motors on the shield, but we're using the stepper motor described above to turn a powerscrew, and we need a very high speed from this ...
If you put the chip to sleep, the clock speed doesn't effect the power consumption (as long as it's sleeping) - so if it spends most of it's time in sleep, you don't care what it's clock speed is when it's running (esp. as it will spend less time awake at a higher clock speed). The rest of the Uno board is a power hog; for low power consumption ...
I have rewritten my DHT library recently and want to test it quickly on lower clock speeds - 8,4,2,1 MHz. Is there an easy way to reduce the (effective) clock speed? I know it can be done by rewriting bootloader/fuses etc. I've used a program on the PC once that could use X% of the clock cycles where X was configurable between 0..99 Could something like that be done with a timer and empty ISR ...
Hello, I have for the first time setup an ATmega328p on a breadboard. I haven't burned the arduino bootloader to it, but I have set the fuses to the default fuse configuration for Arduino Uno boards. The program I upload via the arduino IDE works just fine too! My question is how to verify the clock speed. I am quite certain my controller is running at 16Mhz (I am using an external crystal ...
Long story short, I'm setting up Timer2 to a 1 millisecond duration. I did this a while back. Developed on an UNO, then changed to a Pro Mini. That's when I found the OCR2A register is determined by the clock speed. For 16MHz UNO and MEGA set to 249, for the 8MHz Pro Mini set to 124. I'm using the same code on an Arduino Nano, which according to the specs on the website here is 16Mhz, same as ...
I just received a R4 Minima and R4 Wifi. Since I am the author of the SdFat library, I did some performance tests. The results were very disappointing. I hoped the R4 would perform better than the R3 since it has a max SPI clock rate of 24 MHz vs 8 MHz for the R3. Here are the results: R3 single byte transfer standard SPI library: write speed and latency speed,max,min,avg KB/Sec,usec,usec,usec ...