Hello, I would like to get a heading value from HMC5883L. The values I am getting are strange and unexpected. I am using the correct declination angle and there are no magnetic elements around the sensor (see photo). I have used this sensor in an arduino quadcopter with my flight controller and simple and it worked fine without the need for any offsets. Any ideas? (It looks like a magnetometer sensitivity problem on rpi) Image on google drive: https://drive.google.com/file/d/1eI0mKh ... sp=sharing
Sample code:
Sample code:
Code:
import smbusimport mathimport timeHMC5883L_ADDRESS = 0x1ECONFIG_REGISTER_A = 0x00CONFIG_REGISTER_B = 0x01MODE_REGISTER = 0x02DATA_X_MSB = 0x03DATA_X_LSB = 0x04DATA_Z_MSB = 0x05DATA_Z_LSB = 0x06DATA_Y_MSB = 0x07DATA_Y_LSB = 0x08declination = -5.75bus = smbus.SMBus(1)def setup_hmc5883l(): bus.write_byte_data(HMC5883L_ADDRESS, MODE_REGISTER, 0x00)def read_raw_data(register): high = bus.read_byte_data(HMC5883L_ADDRESS, register) low = bus.read_byte_data(HMC5883L_ADDRESS, register + 1) value = (high << 8) + low if value > 32767: value -= 65536 return valuedef read_hmc5883l(): x = read_raw_data(DATA_X_MSB) z = read_raw_data(DATA_Z_MSB) y = read_raw_data(DATA_Y_MSB) heading_rad = math.atan2(y, x) heading_rad += math.radians(declination) if heading_rad < 0: heading_rad += 2 * math.pi heading_deg = math.degrees(heading_rad) return heading_degif __name__ == "__main__": try: setup_hmc5883l() while True: heading = read_hmc5883l() print(f"Heading: {heading:.2f} degrees") time.sleep(1) except KeyboardInterrupt: print("konec")Statistics: Posted by mart1nek — Sat Dec 23, 2023 9:08 pm