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Arduino provides an convenient way to read analog input this using the analogRead() function. Without going into much details the analogRead() function takes 100 microseconds leading to a theoretical sampling rate of 9600 Hz.
The first part of the OScope project is to implement the Arduino sketch to read the input values from an analog pin. In this article will describe how to achieve a reliable sampling of analog signals up to 615 KHz using some advanced techniques.
Och trots att hans program bara var på några få rader så fattar jag absolut ingentingNote that prescale values below 16 are not recommended because the ADC clock is rated.
Hej rvl!rvl skrev:Så du har fler än åtta "bitar" ut? (Jag ser prick 8 i schemat, men numreringen går från 0 till 9???) Med åtta pinnar borde det inte vara problem, eftersom de går att koppla till samma port.
Kod: Markera allt
/* Values to write to IO-PORT, max 256 value for the whole sinus */
uint8_t dac_table[] = { xx,xx,xx,xx ..... };
/* Delay between samples */
static void delay_to_next_value(uint32_t delay)
{
volatile uint32_t i;
for (i=0; i<delay; i++) {};
}
/* Make Sinus sweep */
void sinus_sweep (uint32 start_delay, uint32_t end_delay)
{
uint32_t i;
while (start_delay > end_delay)
{
for (i=0; i<sizeof (dac_table); i++)
{
HW_IO_PORT = dac_table[i]; /* Write value to port */
delay_to_next_value (start_delay);
}
start_delay--;
}
}
int main ()
{
/* Long delay, low freq, short delay high freq.
sinus_sweep (1000000, 1);
return 0;
}
Programmeras med samma plattform som UNO.It has 54 digital input/output pins (of which 12 can be used as PWM outputs), 12 analog inputs, 4 UARTs (hardware serial ports), a 84 MHz clock, an USB OTG capable connection, 2 DAC (digital to analog).