Reading analog signal

[tuan-nguyen]

Hello everyone,

I am trying to read the analog signal from a joystick using the Spresense main board connected to the extension board.
I had the joystick's VCC, GND, and VRx connected to extension board's VCC, GND, and A0. I am following the code bellow, which is from this link: https://github.com/sonydevworld/spresense-sketches/blob/master/analog_read/analog_read.ino

static const uint8_t pin_l = PIN_A0;
static const uint8_t pin_h = PIN_A4;

void setup() {
  // put your setup code here, to run once:
  pinMode(pin_l, INPUT);
  pinMode(pin_h, INPUT);
  pinMode(PIN_PWM_0, OUTPUT);
  analogWrite(PIN_PWM_0, 200);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000);
  int ret_l = analogRead(pin_l);
  int ret_h = analogRead(pin_h);
  printf("low = %d, high = %d\n", ret_l, ret_h);
}

But after I upload the program and ran the Serial Monitor, it said:
"ERROR: Invalid pin number [128]
spresense dose not support using analog pin as digital."
"ERROR: Invalid pin number [132]
spresense dose not support using analog pin as digital."

Can you give me any advice on this problem?
Thank you for your help.

Best regards,
Tuan Nguyen

[KamilTomaszewski]

Hi @tuan-nguyen-0

You can remove the use of pinMode on analog pins.

The code will look like this:

static const uint8_t pin_l = PIN_A0;
static const uint8_t pin_h = PIN_A4;

void setup() {
  // put your setup code here, to run once:
  pinMode(PIN_PWM_0, OUTPUT);
  analogWrite(PIN_PWM_0, 200);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000);
  int ret_l = analogRead(pin_l);
  int ret_h = analogRead(pin_h);
  printf("low = %d, high = %d\n", ret_l, ret_h);
}

Best Regards,
Kamil Tomaszewski

[tuan-nguyen]

Hi @KamilTomaszewski ,

I have done what you said and it worked.
Thank you for your help.

Best Regards,
Tuan Nguyen