Using AdvancedADC on pins A8,A9,A10, A11 (PureAnalogPins)

Hardware GIGA R1
1

Hello guys,

I am struggling to acquire a signal using A8,A9,A10, A11 pins of Arduino Giga R1.

Here's the modified example code I am using:

#include <Arduino_AdvancedAnalog.h>

AdvancedADC adc(A8.get()); // I must use this method to avoid compiler error
// AdvancedADC adc(PC_2C); // this doesn't wok as well I assume AdvancedAnalog relies on pins_arduino.h definitions (where the PureAnalogPins are not defined)
uint64_t last_millis = 0;

void setup() {
    Serial.begin(9600);

    // Resolution, sample rate, number of samples per channel, queue depth.
    if (!adc.begin(AN_RESOLUTION_16, 16000, 32, 128)) {
        Serial.println("Failed to start analog acquisition!");
        while (1);
    }
}

void loop() {
    if (adc.available()) {
        SampleBuffer buf = adc.read();
        // Process the buffer.
        if ((millis() - last_millis) > 20) {
          Serial.println(buf[0]);   // Sample from first channel
          Serial.println(buf[1]);   // Sample from second channel
          last_millis = millis();
        }
        // Release the buffer to return it to the pool.
        buf.release();
    }
}

The code compiles, but the serial values are showing values as if the pin is floating (despite I have placed a 1k resistor to 3.3V.
Anyone struggling with the same issue that can suggest me a way out?

Before someone asks: all other pins from A0 to A7 are already used in my final code, so I cannot fallback to one of them!

Thanks a lot for your help!

2

Are you using the DAC pins? They can be used as analog inputs A12 & A13.

3

Yep, unfortunately also DAC0 and DAC1 is used :frowning:

Anyhow I posted this issue on the library githop repo: Arduino_AdvancedAnalog

and turns out this feature is actually missing so I guess I will wait for the feature to be released and this thread can be closed! :slight_smile:

1 Like