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Initialize sensor. i2c.start() #Write Register 0BH by 0x01 (Define Set/Reset period) i2c.writeto_mem(13, 0xB, b'\x01') #Write Register 09H by 0x1D # (Define OSR = 512, Full Scale Range = 8 Gauss, ODR = 200Hz, set continuous measurement mode) i2c.writeto_mem(13, 0x9, b'\x11101') i2c.stop() # Reserve some memory for the raw xyz measurements. self.data = array('B', [0] * 9) def reset(self): """performs a reset of the device by writing to the memory address 0xA, the value of b '\ x10000000' """ #Write Register 0AH by 0x80 self.i2c.writeto_mem(13, 0xA, b'\x10000000') def stanbdy (self): """device goes into a sleep state by writing to memory address 0x9, b '\ x00' """ self.i2c.writeto_mem(13, 0x9, b'\x00') def read(self): """performs a reading of the data in the position of momoria 0x00, by means of a buffer""" data = self.data #Read data register 00H ~ 05H. self.i2c.readfrom_mem_into(13, 0x00, data) time.sleep(0.005) #self.i2c.readfrom_mem_into(13, 0x00, temperature) #time.sleep(0.005) x = (data[1] << 8) | data[0] y = (data[3] << 8) | data[2] z = (data[5] << 8) | data[4] status =data[6] temperature =z = (data[8] << 8) | data[7] scale =3000 temperature_offest=50.0 return (x / scale, y / scale, z / scale, status, (temperature / 100 + temperature_offest)) 55:T237f,# -*- coding: utf-8 -*- """ Python driver for the QMC5883L 3-Axis Magnetic Sensor. Usage example: import py_qmc5883l sensor = py_qmc5883l.QMC5883L() m = sensor.get_magnet() print(m) you will get three 16 bit signed integers, representing the values of the magnetic sensor on axis X, Y and Z, e.g. [-1257, 940, -4970]. """ import logging import math import time import smbus __author__ = "Niccolo Rigacci" __copyright__ = "Copyright 2018 Niccolo Rigacci " __license__ = "GPLv3-or-later" __email__ = "niccolo@rigacci.org" __version__ = "0.1.4" DFLT_BUS = 1 DFLT_ADDRESS = 0x0d REG_XOUT_LSB = 0x00 # Output Data Registers for magnetic sensor. REG_XOUT_MSB = 0x01 REG_YOUT_LSB = 0x02 REG_YOUT_MSB = 0x03 REG_ZOUT_LSB = 0x04 REG_ZOUT_MSB = 0x05 REG_STATUS_1 = 0x06 # Status Register. REG_TOUT_LSB = 0x07 # Output Data Registers for temperature. REG_TOUT_MSB = 0x08 REG_CONTROL_1 = 0x09 # Control Register #1. REG_CONTROL_2 = 0x0a # Control Register #2. REG_RST_PERIOD = 0x0b # SET/RESET Period Register. REG_CHIP_ID = 0x0d # Chip ID register. # Flags for Status Register #1. STAT_DRDY = 0b00000001 # Data Ready. STAT_OVL = 0b00000010 # Overflow flag. STAT_DOR = 0b00000100 # Data skipped for reading. # Flags for Status Register #2. INT_ENB = 0b00000001 # Interrupt Pin Enabling. POL_PNT = 0b01000000 # Pointer Roll-over. SOFT_RST = 0b10000000 # Soft Reset. # Flags for Control Register 1. MODE_STBY = 0b00000000 # Standby mode. MODE_CONT = 0b00000001 # Continuous read mode. ODR_10HZ = 0b00000000 # Output Data Rate Hz. ODR_50HZ = 0b00000100 ODR_100HZ = 0b00001000 ODR_200HZ = 0b00001100 RNG_2G = 0b00000000 # Range 2 Gauss: for magnetic-clean environments. RNG_8G = 0b00010000 # Range 8 Gauss: for strong magnetic fields. OSR_512 = 0b00000000 # Over Sample Rate 512: less noise, more power. OSR_256 = 0b01000000 OSR_128 = 0b10000000 OSR_64 = 0b11000000 # Over Sample Rate 64: more noise, less power. class QMC5883L(object): """Interface for the QMC5883l 3-Axis Magnetic Sensor.""" def __init__(self, i2c_bus=DFLT_BUS, address=DFLT_ADDRESS, output_data_rate=ODR_10HZ, output_range=RNG_2G, oversampling_rate=OSR_512): self.address = address self.bus = smbus.SMBus(i2c_bus) self.output_range = output_range self._declination = 0.0 self._calibration = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]] chip_id = self._read_byte(REG_CHIP_ID) if chip_id != 0xff: msg = "Chip ID returned 0x%x instead of 0xff; is the wrong chip?" logging.warning(msg, chip_id) self.mode_cont = (MODE_CONT | output_data_rate | output_range | oversampling_rate) self.mode_stby = (MODE_STBY | ODR_10HZ | RNG_2G | OSR_64) self.mode_continuous() def __del__(self): """Once finished using the sensor, switch to standby mode.""" self.mode_standby() def mode_continuous(self): """Set the device in continuous read mode.""" self._write_byte(REG_CONTROL_2, SOFT_RST) # Soft reset. self._write_byte(REG_CONTROL_2, INT_ENB) # Disable interrupt. self._write_byte(REG_RST_PERIOD, 0x01) # Define SET/RESET period. self._write_byte(REG_CONTROL_1, self.mode_cont) # Set operation mode. def mode_standby(self): """Set the device in standby mode.""" self._write_byte(REG_CONTROL_2, SOFT_RST) self._write_byte(REG_CONTROL_2, INT_ENB) self._write_byte(REG_RST_PERIOD, 0x01) self._write_byte(REG_CONTROL_1, self.mode_stby) # Set operation mode. def _write_byte(self, registry, value): self.bus.write_byte_data(self.address, registry, value) time.sleep(0.01) def _read_byte(self, registry): return self.bus.read_byte_data(self.address, registry) def _read_word(self, registry): """Read a two bytes value stored as LSB and MSB.""" low = self.bus.read_byte_data(self.address, registry) high = self.bus.read_byte_data(self.address, registry + 1) val = (high << 8) + low return val def _read_word_2c(self, registry): """Calculate the 2's complement of a two bytes value.""" val = self._read_word(registry) if val >= 0x8000: # 32768 return val - 0x10000 # 65536 else: return val def get_data(self): """Read data from magnetic and temperature data registers.""" i = 0 [x, y, z, t] = [None, None, None, None] while i < 20: # Timeout after about 0.20 seconds. status = self._read_byte(REG_STATUS_1) if status & STAT_OVL: # Some values have reached an overflow. msg = ("Magnetic sensor overflow.") if self.output_range == RNG_2G: msg += " Consider switching to RNG_8G output range." logging.warning(msg) if status & STAT_DOR: # Previous measure was read partially, sensor in Data Lock. x = self._read_word_2c(REG_XOUT_LSB) y = self._read_word_2c(REG_YOUT_LSB) z = self._read_word_2c(REG_ZOUT_LSB) continue if status & STAT_DRDY: # Data is ready to read. x = self._read_word_2c(REG_XOUT_LSB) y = self._read_word_2c(REG_YOUT_LSB) z = self._read_word_2c(REG_ZOUT_LSB) t = self._read_word_2c(REG_TOUT_LSB) break else: # Waiting for DRDY. time.sleep(0.01) i += 1 return [x, y, z, t] def get_magnet_raw(self): """Get the 3 axis values from magnetic sensor.""" [x, y, z, t] = self.get_data() return [x, y, z] def get_magnet(self): """Return the horizontal magnetic sensor vector with (x, y) calibration applied.""" [x, y, z] = self.get_magnet_raw() if x is None or y is None: [x1, y1] = [x, y] else: c = self._calibration x1 = x * c[0][0] + y * c[0][1] + c[0][2] y1 = x * c[1][0] + y * c[1][1] + c[1][2] return [x1, y1] def get_bearing_raw(self): """Horizontal bearing (in degrees) from magnetic value X and Y.""" [x, y, z] = self.get_magnet_raw() if x is None or y is None: return None else: b = math.degrees(math.atan2(y, x)) if b < 0: b += 360.0 return b def get_bearing(self): """Horizontal bearing, adjusted by calibration and declination.""" [x, y] = self.get_magnet() if x is None or y is None: return None else: b = math.degrees(math.atan2(y, x)) if b < 0: b += 360.0 b += self._declination if b < 0.0: b += 360.0 elif b >= 360.0: b -= 360.0 return b def get_temp(self): """Raw (uncalibrated) data from temperature sensor.""" [x, y, z, t] = self.get_data() return t def set_declination(self, value): """Set the magnetic declination, in degrees.""" try: d = float(value) if d < -180.0 or d > 180.0: logging.error(u'Declination must be >= -180 and <= 180.') else: self._declination = d except: logging.error(u'Declination must be a float value.') def get_declination(self): """Return the current set value of magnetic declination.""" return self._declination def set_calibration(self, value): """Set the 3x3 matrix for horizontal (x, y) magnetic vector calibration.""" c = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]] try: for i in range(0, 3): for j in range(0, 3): c[i][j] = float(value[i][j]) self._calibration = c except: logging.error(u'Calibration must be a 3x3 float matrix.') def get_calibration(self): """Return the current set value of the calibration matrix.""" return self._calibration declination = property(fget=get_declination, fset=set_declination, doc=u'Magnetic declination to adjust bearing.') calibration = property(fget=get_calibration, fset=set_calibration, doc=u'Transformation matrix to adjust (x, y) magnetic vector.')b:["$","$L52",null,{"project":{"name":"(Fail)QMC5883L Compass","id":"449821286001164289","files":[{"name":"main.py","content":"from QMC5883 import QMC5883L\r\nfrom machine import I2C, Pin\r\n\r\ni2c = I2C(0, scl=Pin((17)), sda=Pin((16)), freq=100000)\r\nqmc=QMC5883L(i2c)\r\nx, y, z, status, temp =qmc.read()\r\nprint (x, y, z, status, temp)"},{"name":"diagram.json","content":"$53"},{"name":"libraries.txt","content":"# Wokwi Library List\n# See https://docs.wokwi.com/guides/libraries\n\nQMC5883LCompass\nLiquidCrystal"},{"name":"qmc5883l.chip.json","content":"{\r\n \"name\": \"QMC5883L\",\r\n \"author\": \"Andrew Myers\",\r\n \"pins\": [\r\n \"VCC\",\r\n \"GND\",\r\n \"SCL\",\r\n \"SDA\",\r\n \"DRDY\",\r\n \"\",\r\n \"\",\r\n \"\",\r\n \"\",\r\n \"\"\r\n ],\r\n \"controls\": []\r\n}"},{"name":"qmc5883l.chip.c","content":"#include \"wokwi-api.h\"\r\n#include \r\n#include \r\n\r\ntypedef struct {\r\n\r\n} chip_state_t;\r\n\r\nvoid chip_init() {\r\n chip_state_t *chip = malloc(sizeof(chip_state_t));\r\n}"},{"name":"Note.txt","content":"\r\nArduinoUNO_QMC5883LCompass https://wokwi.com/projects/380864522524516353\r\nArduinoUNO_QMC5883LCompass https://wokwi.com/projects/380864522524516353\r\nhttps://wokwi.com/projects/392976161195604993\r\n\r\ni2c compass/magnetometer https://wokwi.com/projects/393696922329266177\r\n\r\nmicropython-esp32-qmc5883 https://github.com/juliantesla13/micropython-esp32-qmc5883\r\nPython driver for the QMC5883L 3-Axis Magnetic Sensor https://github.com/RigacciOrg/py-qmc5883l\r\n#!/usr/bin/python\r\nimport time\r\nimport py_qmc5883l\r\nsensor = py_qmc5883l.QMC5883L()\r\nwhile True:\r\n print sensor.get_magnet()\r\n time.sleep(0.2)\r\n\r\nMagnetometer Compass with Raspberry PI Pico: GY-271 HMC5883L wiring and use with MicroPython\r\nhttps://peppe8o.com/magnetometer-compass-with-raspberry-pi-pico-gy-271-hmc5883l-wiring-and-use-with-micropython/\r\n\r\n9dof_hmc5883_MPU6050_w_adafruit_AzAlt\r\nby drf5n\r\nhttps://wokwi.com/projects/474932890527678465\r\nhmc5883_Magnetometer_w_adafruit_AzAlt\r\nby drf5n\r\nhttps://wokwi.com/projects/474472514120460289\r\n"},{"name":"QMC5883.py","content":"$54"},{"name":"py-qmc5883l.py","content":"$55"}],"serverFiles":[],"owner":"349464090464223827","ownerUsername":"raylee0106","locked":false,"unlisted":false,"updated":1791066166268,"hearts":0,"userLiked":false}}] e:null 14:[["$","title","0",{"children":"(Fail)QMC5883L Compass - Wokwi ESP32, STM32, Arduino Simulator"}],["$","meta","1",{"name":"description","content":"Run IoT and embedded projects in your browser: ESP32, STM32, Arduino, Pi Pico, and more. 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