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Found 8 results

  1. How to calibrate digital output accelerometers like ADXL345 or ADXL345 to obtain the outputs as 'g' values? I have interfaced it with TM4C1294XL and the communication is through I2C protocol. Platform used is Energia.
  2. Hi everyone I am beginner and I want to use the adxl345 with msp430g2553 with I2C, but the example that I am using don´t working, always send 0 in the axes x,y and z. I use energia 1.6.10e18, the circuit have the pull'up resistor in SDA and SCL pines, and I remove the jumper of the green led. I used the same code but with arduino and it working but with enegia not, help me please. My launchpad is MSP-EXP430G2 rev 1.5 The SCL is connected in pin 14 and the SDA in pin 15. My OS is windows 7 When i put this function "Wire.setModule(0)" the mcu does make nothing, the uart don´t send nothing. The code is the follow: #include <Wire.h> void setup() { Serial.begin(9600); Serial.print("Iniciado"); Wire.begin(); writeTo(DATA_FORMAT, 0x01); //Put the ADXL345 into +/- 4G range by writing the value 0x01 to the DATA_FORMAT register. writeTo(POWER_CTL, 0x08); //Put the ADXL345 into Measurement Mode by writing 0x08 to the POWER_CTL register. } void loop() { uint8_t howManyBytesToRead = 6; readFrom( DATAX0, howManyBytesToRead, _buff); //read the acceleration data from the ADXL345 int X = (((int)_buff[1]) << 😎 | _buff[0]; int Y = (((int)_buff[3]) << 😎 | _buff[2]; int Z = (((int)_buff[5]) << 😎 | _buff[4]; Serial.print("x: "); Serial.print( X ); Serial.print(" y: "); Serial.print( Y ); delay(500); } void writeTo(byte address, byte val) { Wire.beginTransmission(DEVICE); // start transmission to device Wire.write(address); // send register address Wire.write(val); // send value to write Wire.endTransmission(); // end transmission } void readFrom(byte address, int num, byte _buff[]) { Wire.beginTransmission(DEVICE); // start transmission to device Wire.write(address); // sends address to read from Wire.endTransmission(); // end transmission Wire.beginTransmission(DEVICE); // start transmission to device Wire.requestFrom(DEVICE, num); // request 6 bytes from device int i = 0; while(Wire.available()) // device may send less than requested (abnormal) { digitalWrite(RED_LED,HIGH); _buff = Wire.read(); // receive a byte i++; } Wire.endTransmission(); // end transmission }
  3. How to calibrate digital output accelerometers like ADXL345 or ADXL345 to obtain the outputs as 'g' values? I have interfaced it with TM4C1294XL and the communication is through I2C protocol. Platform used is Energia.
  4. I am trying to interface GY-80 (only adxl345) to TM4C1294XL board using Energia. But outputs comes out to be 0. And also there comes this error "Failed to load dynamic library: 'ftd2xx.dll' " while uploading but the code gets uploaded successfully. I am pasting the code below, can somebody tell me where i am doing it wrong? #include "Wire.h" #define Power_Register 0x2D #define BW_rate 0x2C #define Int_enable 0x2E #define dataFormat 0x31 #define X_Axis_Register_DATAX0 0x32 #define X_Axis_Register_DATAX1 0x33 #define Y_Axis_Register_DATAY0 0x34 #define Y_Axis_Register_DATAY1 0x35 #define Z_Axis_Register_DATAZ0 0x36 #define Z_Axis_Register_DATAZ1 0x37 #define fifoCntrl 0x38 int ADXAddress = 0x53; int X0,X1,X_out; int Y0,Y1,Y_out; int Z1,Z0,Z_out; float Xa,Ya,Za; void setup() { Wire.setModule(0); Wire.begin(ADXAddress); Serial.begin(115200); delay(100); Wire.beginTransmission(ADXAddress); Wire.write(Power_Register); Wire.write(8); Wire.write(BW_rate); Wire.write(10); Wire.write(dataFormat); Wire.write(11); Wire.write(fifoCntrl); Wire.write(0); Wire.endTransmission(); } void loop() { Wire.beginTransmission(ADXAddress); Wire.write(X_Axis_Register_DATAX0); Wire.write(X_Axis_Register_DATAX1); Wire.endTransmission(); Wire.requestFrom(ADXAddress,2); if(Wire.available()<=2) { X0 = Wire.read(); X1 = Wire.read(); X1=X1<<8; X_out =X0+X1; } Wire.beginTransmission(ADXAddress); Wire.write(Y_Axis_Register_DATAY0); Wire.write(Y_Axis_Register_DATAY1); Wire.endTransmission(); Wire.requestFrom(ADXAddress,2); if(Wire.available()<=2) { Y0 = Wire.read(); Y1 = Wire.read(); Y1=Y1<<8; Y_out =Y0+Y1; } Wire.beginTransmission(ADXAddress); Wire.write(Z_Axis_Register_DATAZ0); Wire.write(Z_Axis_Register_DATAZ1); Wire.endTransmission(); Wire.requestFrom(ADXAddress,2); if(Wire.available()<=2) { Z0 = Wire.read(); Z1 = Wire.read(); Z1=Z1<<8; Z_out =Z0+Z1; } Serial.print("Xa= "); Serial.print(Xa);Serial.print("\t"); Serial.print("Ya= "); Serial.print(Ya);Serial.print("\t"); Serial.print("Za= "); Serial.println(Za); delay(1000); Serial.println(); }
  5. Hello! I am using Energia 17 & 18 to code for the MSP430F5529 and ADXL345. The following is the code I used. //Add the SPI library so we can communicate with the ADXL345 sensor #include <SPI.h> //Assign the Chip Select signal to pin 2. int CS = 2; //This is a list of some of the registers available on the ADXL345. //To learn more about these and the rest of the registers on the ADXL345, read the datasheet! char POWER_CTL = 0x2D; //Power Control Register char DATA_FORMAT = 0x31; char DATAX0 = 0x32; //X-Axis Data 0 char DATAX1 = 0x33; //X-Axis Data 1 char DATAY0 = 0x34; //Y-Axis Data 0 char DATAY1 = 0x35; //Y-Axis Data 1 char DATAZ0 = 0x36; //Z-Axis Data 0 char DATAZ1 = 0x37; //Z-Axis Data 1 //This buffer will hold values read from the ADXL345 registers. char values[10]; //These variables will be used to hold the x,y and z axis accelerometer values. long x,y,z; void setup(){ //Initiate an SPI communication instance. SPI.begin(); //Configure the SPI connection for the ADXL345. SPI.setDataMode(SPI_MODE3); //Create a serial connection to display the data on the terminal. Serial.begin(115200); Serial.println("GO!"); //Set up the Chip Select pin to be an output from the Arduino. pinMode(CS, OUTPUT); //Before communication starts, the Chip Select pin needs to be set high. digitalWrite(CS, HIGH); //Put the ADXL345 into +/- 4G range by writing the value 0x01 to the DATA_FORMAT register. writeRegister(DATA_FORMAT, 0x00); //Put the ADXL345 into Measurement Mode by writing 0x08 to the POWER_CTL register. writeRegister(POWER_CTL, 0x08); //Measurement mode } void loop(){ //Reading 6 bytes of data starting at register DATAX0 will retrieve the x,y and z acceleration values from the ADXL345. //The results of the read operation will get stored to the values[] buffer. readRegister(DATAX0, 6, values); //The ADXL345 gives 10-bit acceleration values, but they are stored as bytes (8-bits). To get the full value, two bytes must be combined for each axis. //The X value is stored in values[0] and values[1]. x = ((long)values[1]<<8)|(long)values[0]; //The Y value is stored in values[2] and values[3]. y = ((long)values[3]<<8)|(long)values[2]; //The Z value is stored in values[4] and values[5]. z = ((long)values[5]<<8)|(long)values[4]; //Print the results to the terminal. Serial.print(x); Serial.print('\t'); Serial.print(y); Serial.print('\t'); Serial.println(z); delay(100); } //This function will write a value to a register on the ADXL345. //Parameters: // char registerAddress - The register to write a value to // char value - The value to be written to the specified register. void writeRegister(char registerAddress, char value){ //Set Chip Select pin low to signal the beginning of an SPI packet. digitalWrite(CS, LOW); //Transfer the register address over SPI. SPI.transfer(registerAddress); //Transfer the desired register value over SPI. SPI.transfer(value); //Set the Chip Select pin high to signal the end of an SPI packet. digitalWrite(CS, HIGH); } //This function will read a certain number of registers starting from a specified address and store their values in a buffer. //Parameters: // char registerAddress - The register addresse to start the read sequence from. // int numBytes - The number of registers that should be read. // char * values - A pointer to a buffer where the results of the operation should be stored. void readRegister(char registerAddress, int numBytes, char * values){ //Since we're performing a read operation, the most significant bit of the register address should be set. char address = 0x80 | registerAddress; //If we're doing a multi-byte read, bit 6 needs to be set as well. if(numBytes > 1)address = address | 0x40; //Set the Chip select pin low to start an SPI packet. digitalWrite(CS, LOW); //Transfer the starting register address that needs to be read. SPI.transfer(address); //Continue to read registers until we've read the number specified, storing the results to the input buffer. for(int i=0; i<numBytes; i++){ values = SPI.transfer(0x00); } //Set the Chips Select pin high to end the SPI packet. digitalWrite(CS, HIGH); } The output is all -1,-1,-1. When I moved the ADXL345 module, they became 0,0,0 or some wired combinations like -1,0,-678234. Can someone help me to see what is wrong with the code? I changed the chip select pin numbers when I code for them and I am using USCIA port. This code is from other places. Thanks! Yutao Li
  6. I'm trying to get my Tiva C (lm4f120) to read a adxl345 (accelerometer) and output the x, y and z values. I'm using the SSI2 peripheral, and everything seems to be wired correctly. By moving the adxl345 around, I can get the values to change, however they seem to overflow or something weird. They seem to tend toward 65535 when it should be reading 0. 65332 279 65519 65313 274 65528 65289 273 0 65271 275 1 65259 274 38 65318 238 69 65304 220 135 65303 207 134 65312 125 202 65308 67 242 65311 87 214 65316 69 222 65312 66 221 65310 68 219 65305 63 224 65513 65434 65430 58 68 65509 20 65518 3 33 21 33 11 65522 65532 18 65520 0 10 65527 65533 17 0 14 6 65528 65527 12 65525 2 19 65514 65532 22 65515 2 65526 65452 6 65368 65315 64 65353 65384 105 65379 65497 240 65340 84 270 65289 78 245 65234 70 205 65284 215 133 65277 228 107 65282 233 80 65297 184 67 65285 270 8 65281 274 65529 65281 273 65532 The code I'm using is below //Add the SPI library so we can communicate with the ADXL345 sensor #include <SPI.h> //Assign the Chip Select signal to pin 2. int CS = 2; //This is a list of some of the registers available on the ADXL345. //To learn more about these and the rest of the registers on the ADXL345, read the datasheet! char POWER_CTL = 0x2D; //Power Control Register char DATA_FORMAT = 0x31; char DATAX0 = 0x32; //X-Axis Data 0 char DATAX1 = 0x33; //X-Axis Data 1 char DATAY0 = 0x34; //Y-Axis Data 0 char DATAY1 = 0x35; //Y-Axis Data 1 char DATAZ0 = 0x36; //Z-Axis Data 0 char DATAZ1 = 0x37; //Z-Axis Data 1 //This buffer will hold values read from the ADXL345 registers. char values[10]; //These variables will be used to hold the x,y and z axis accelerometer values. long x,y,z; void setup(){ //Initiate an SPI communication instance. SPI.begin(); //Configure the SPI connection for the ADXL345. SPI.setDataMode(SPI_MODE3); //Create a serial connection to display the data on the terminal. Serial.begin(115200); Serial.println("GO!"); //Set up the Chip Select pin to be an output from the Arduino. pinMode(CS, OUTPUT); //Before communication starts, the Chip Select pin needs to be set high. digitalWrite(CS, HIGH); //Put the ADXL345 into +/- 4G range by writing the value 0x01 to the DATA_FORMAT register. writeRegister(DATA_FORMAT, 0x00); //Put the ADXL345 into Measurement Mode by writing 0x08 to the POWER_CTL register. writeRegister(POWER_CTL, 0x08); //Measurement mode } void loop(){ //Reading 6 bytes of data starting at register DATAX0 will retrieve the x,y and z acceleration values from the ADXL345. //The results of the read operation will get stored to the values[] buffer. readRegister(DATAX0, 6, values); //The ADXL345 gives 10-bit acceleration values, but they are stored as bytes (8-bits). To get the full value, two bytes must be combined for each axis. //The X value is stored in values[0] and values[1]. x = ((long)values[1]<<8)|(long)values[0]; //The Y value is stored in values[2] and values[3]. y = ((long)values[3]<<8)|(long)values[2]; //The Z value is stored in values[4] and values[5]. z = ((long)values[5]<<8)|(long)values[4]; //Print the results to the terminal. Serial.print(x); Serial.print('\t'); Serial.print(y); Serial.print('\t'); Serial.println(z); delay(100); } //This function will write a value to a register on the ADXL345. //Parameters: // char registerAddress - The register to write a value to // char value - The value to be written to the specified register. void writeRegister(char registerAddress, char value){ //Set Chip Select pin low to signal the beginning of an SPI packet. digitalWrite(CS, LOW); //Transfer the register address over SPI. SPI.transfer(registerAddress); //Transfer the desired register value over SPI. SPI.transfer(value); //Set the Chip Select pin high to signal the end of an SPI packet. digitalWrite(CS, HIGH); } //This function will read a certain number of registers starting from a specified address and store their values in a buffer. //Parameters: // char registerAddress - The register addresse to start the read sequence from. // int numBytes - The number of registers that should be read. // char * values - A pointer to a buffer where the results of the operation should be stored. void readRegister(char registerAddress, int numBytes, char * values){ //Since we're performing a read operation, the most significant bit of the register address should be set. char address = 0x80 | registerAddress; //If we're doing a multi-byte read, bit 6 needs to be set as well. if(numBytes > 1)address = address | 0x40; //Set the Chip select pin low to start an SPI packet. digitalWrite(CS, LOW); //Transfer the starting register address that needs to be read. SPI.transfer(address); //Continue to read registers until we've read the number specified, storing the results to the input buffer. for(int i=0; i<numBytes; i++){ values[i] = SPI.transfer(0x00); } //Set the Chips Select pin high to end the SPI packet. digitalWrite(CS, HIGH); } If someone is able to provide some guidance on how to test or fix this, that would be great. Thanks
  7. I've been playing with Adafruit's ADXL345 accelerometer BOB and was able to import and run the Adafruit library code without any edits. Sweet...
  8. Hi , I am using MSP430FR6x8x Controller. (Launchpad of MSP430FR6989) and In my project I wanted to Interface ADXL345 Over I2C with MSP4306989 Launchpad. I have tried the Reference codes available from TI and tried to change slave address of the ADXL345. But Still I have not got any success. For Reference , I am using ADXL345 Breakout Board having 4.1k Pull up for I2C lines. And while connecting I am also taking care of Grounds. Pin I ma using is P1.6 for SDA and Pin p1.7 for SCL In ADXL345 the CS pin is tied with Vcc and also ALT pin is too connected with Vcc. So As per data sheet I am Trying slave address of the device than write address of the device. But so far I have not got any success. Can Anyone help me out here please. I have MSP430FR6989 Launchpad Thanks, Hinesh
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