ADXL362 issue

Using Arduino Sensors
#1

Hi All

I’m new so don’t be too hard on me. I have followed the set-up guidelines in connecting the EVAL-ADXL362-ARDZ Analog Accelerometer board with the integrated LCD screen and the Arduino UNO as described in:
https://wiki.analog.com/resources/eval/user-guides/arduino-uno/reference_designs/demo_adxl362#serial_terminal_output

My issue is that I cannot get it to display any readings on the LCD screen. Once the arduino gets power the screen lights up for a second and then goes blank. There were on errors when verifying the code and it uploaded without issue. Below is the sketch, any feedback would be welcome.

#include “ADXL362.h”
#include “Lcd.h”
#include “Communication.h”
#include <SPI.h>

byte ADXL_CS_PIN = 10;
byte LCD_CS_PIN = 11;

uint8_t ui8s[22];
uint8_t ui8xu;
uint8_t ui8xd;
uint8_t ui8yu;
uint8_t ui8yd;
uint8_t ui8all;
uint8_t ui8awake;

char temp[10];

#if TEMP_ADC == 0
float f32temp;
#endif

void setup() {
Serial.begin(9600);
SPI.begin();
SPI.setDataMode(SPI_MODE3); //CPHA = CPOL = 1 MODE = 3
delay(1000);

/* Initialize LCD */
Lcd_Init();

/* Initialize accelerometer */
Sensor_Init();

/* Start accelerometer measurement mode */
Sensor_Start();

}

void loop() {
if (digitalRead(INTACC_PIN)) {
if (ui8awake == 0) {
ui8awake = 1;

/* Set BLLCD pin - turn on LCD backlight */
digitalWrite(BLLCD_PIN,HIGH);

Lcd_DisplayString(0, 60, (int8_t *)"[mG]");
Lcd_DisplayString(1, 60, (int8_t *)"[mG]");
Lcd_DisplayString(2, 60, (int8_t *)"[mG]");

#if TEMP_ADC == 1
Lcd_DisplayString(3, 60, (int8_t *)"[ADC]");
#else
Lcd_DisplayString(3, 60, (int8_t *)"

");
#endif
            ui8xu = 0;
            ui8xd = 0;
            ui8yu = 0;
            ui8yd = 0;
            ui8all = 0;

            Lcd_DisplaySymbol(0, UP_X, 8, pui8RecInv8x8);
            Lcd_DisplaySymbol(1, LEFT_X, 8, pui8RecInv8x8);
            Lcd_DisplaySymbol(1, RIGHT_X, 8, pui8RecInv8x8);
            Lcd_DisplaySymbol(2, DOWN_X, 8, pui8RecInv8x8);
            Lcd_DisplaySymbol(1, CENTER_X, 8, pui8RecInv8x8);
         }

      } else {
         if (ui8awake == 1) {
            ui8awake = 0;

            /* Clear BLLCD pin - turn off LCD backlight */
            digitalWrite(BLLCD_PIN,LOW);

            /* Clear screen */
            Lcd_FillPages(0, 4, 0x00);
         }
      }

      if (ui8awake == 1) {
         Sensor_Scan();
        
         sprintf((char *)ui8s, "x = % 5d", i16SensorX);
         Lcd_DisplayString(0, 0, (int8_t *)ui8s);

         sprintf((char *)ui8s, "y = % 5d", i16SensorY);
         Lcd_DisplayString(1, 0, (int8_t *)ui8s);

         sprintf((char *)ui8s, "z = % 5d", i16SensorZ);
         Lcd_DisplayString(2, 0, (int8_t *)ui8s);

#if TEMP_ADC == 1
         sprintf((char *)ui8s, "t = % 5d", i16SensorT);
         Lcd_DisplayString(3, 0, (int8_t *)ui8s);
#else
         f32temp = ((float)i16SensorT + ACC_TEMP_BIAS) / (1 / ACC_TEMP_SENSITIVITY);
         Lcd_DisplayString(3, 60, (int8_t *)" [C]");
         dtostrf(f32temp, 2, 2, temp);  
         sprintf((char *)ui8s, "t = %s  ", temp);
         Lcd_DisplayString(3, 0, (int8_t *)ui8s); 
#endif

         if (i16SensorY > ACC_LIMIT) {
            if (ui8xu == 0) {
               ui8xu = 1;
               Lcd_DisplaySymbol(0, UP_X, 8, pui8Rec8x8);
            }

         } else {
            if (ui8xu == 1) {
               ui8xu = 0;
               Lcd_DisplaySymbol(0, UP_X, 8, pui8RecInv8x8);
            }
         }

         if (i16SensorY < -ACC_LIMIT) {
            if (ui8xd == 0) {
               ui8xd = 1;
               Lcd_DisplaySymbol(2, DOWN_X, 8, pui8Rec8x8);
            }

         } else {
            if (ui8xd == 1) {
               ui8xd = 0;
               Lcd_DisplaySymbol(2, DOWN_X, 8, pui8RecInv8x8);
            }
         }

         if (i16SensorX > ACC_LIMIT) {
            if (ui8yu == 0) {
               ui8yu = 1;
               Lcd_DisplaySymbol(1, RIGHT_X, 8, pui8Rec8x8);
            }

         } else {
            if (ui8yu == 1) {
               ui8yu = 0;
               Lcd_DisplaySymbol(1, RIGHT_X, 8, pui8RecInv8x8);
            }
         }

         if (i16SensorX < -ACC_LIMIT) {
            if (ui8yd == 0) {
               ui8yd = 1;
               Lcd_DisplaySymbol(1, LEFT_X, 8, pui8Rec8x8);
            }

         } else {
            if (ui8yd == 1) {
               ui8yd = 0;
               Lcd_DisplaySymbol(1, LEFT_X, 8, pui8RecInv8x8);
            }
         }

         if ((ui8xu == 0) && (ui8xd == 0) && (ui8yu == 0) && (ui8yd == 0)) {
            if (ui8all == 0) {
               ui8all = 1;
               Lcd_DisplaySymbol(1, CENTER_X, 8, pui8Rec8x8);
            }

         } else {
            if (ui8all == 1) {
               ui8all = 0;
               Lcd_DisplaySymbol(1, CENTER_X, 8, pui8RecInv8x8);
            }
         }
      }
}
#2

You are creating two variables, but you are not using them.

byte ADXL_CS_PIN = 10;
byte LCD_CS_PIN = 11;

In sounds like you are defining chip select pins. Usually you would need to tell the libraries which pin you have chosen.

I found the example on github and found you are using libraries that are part of the example. Unfortunately, the libraries in this example are not flexible. They are hardwired. You will need to check the header files. The Communications.h file talks about jumpers on the board. You will need to check them out.

If you have an oscilloscope, check the signals at the LCD. The CS pin needs to go low during the entire time the SPI interface send and receives data. Otherwise the LCD will ignore everything.

Alternatively, you can try to find better libraries for the LCD for instance. There are many standard modules and libraries available. Usually they allow you to specify which pins you have connected for functions like chip select. They also come with examples that are very short and easy to understand. Once you played which each individual component it is much easier to combine things together.

Could you please read the following post to make sure your post is nicely formatted? Try to modify your post and add code tags around your entire code. Mark the source code and click the </> icon. :slight_smile:

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#3