How to read register value from ADXL345 Eval board?

Using Arduino Sensors
12

johnwasser:
ARDUINO pins 14-17 a.k.a. A0-A3. Yes, they are pins 23-26 on the ATmega chip.

Hardware SPI is on ARDUINO pins 10-13 which are pins 16-19 on the ATmega.

If you are going to use the Arduino libraries you should probably get used to calling the pins by their Arduino numbers to avoid confusion. You can learn more about the naming here: Arduino Pins - Google Drive

hi John....sorry for use up your time for this. In the progress i edit my code till like this:
setup:

char adxl345_read(char address);
int ledPin = 2;
#define ACCEL_CS	A0
#define ACCEL_SCK	A1
#define ACCEL_DI	A2
#define ACCEL_DO	A3
#define DATAX0			0x32	//X-Axis Data 0
#define DATAX1			0x33	//X-Axis Data 1
#define DATAY0			0x34	//Y-Axis Data 0
#define DATAY1			0x35	//Y-Axis Data 1
#define DATAZ0			0x36	//Z-Axis Data 0
#define DATAZ1			0x37	//Z-Axis Data 1
#define SELECT_ACCEL()        digitalWrite(ACCEL_CS, LOW)
#define UNSELECT_ACCEL()    digitalWrite(ACCEL_CS, HIGH)

#define CLOCK_HIGH()	        digitalWrite(ACCEL_SCK, HIGH)
#define CLOCK_LOW()		digitalWrite(ACCEL_SCK, LOW)
#include <SPI.h>

void setup(){
  SPI.begin();
  Serial.begin(57600);
  pinMode(ledPin, OUTPUT);
}

read function:

char adxl345_read(char register_address){
	char read_address=0x80 | register_address;
	char register_value=0;
        char temp = 0;
	
	CLOCK_HIGH();
	SELECT_ACCEL();	//Lower CS pin.
	
        if (register_value!=temp)
            {
              digitalWrite(ledPin, HIGH);   // sets the LED on
              delay(1000);
             }
        else{
        digitalWrite(ledPin, LOW);    // sets the LED off
        delay(1000); }                 // waits for a second

	for(int bit=7; bit>=0; bit--){
		CLOCK_LOW();
                digitalWrite(ACCEL_DI, read_address & (1<<bit));
		delayMicroseconds(1);
		CLOCK_HIGH();
		delayMicroseconds(1);
	}
	
	for(int bit=7; bit>=0; bit--){
		CLOCK_LOW();
		delayMicroseconds(1);
		
		CLOCK_HIGH();
		delayMicroseconds(1);
		
		register_value |= digitalRead(ACCEL_DI)<<bit;
	}
	
	UNSELECT_ACCEL();
        temp = register_value;
	return register_value;
}

Loop:

void loop(){
  adxl345_read(DATAX0);
}

same i use ledpin to indicate the availability of the register_value....but still no given any response....following the reference that u gave:

i connect the A0-A3 to pin 11-13 (while pin 10 is not for SPI right?)...so is there any error?

Again, thanks for sparing your time on me. Appreciate so much :slight_smile: