Last update: 250928 20:38:34

Arduino cansat and IMUs

There are many IMU boards to be used with Arduinos, ESP32, Teensy etc

In general they have

An IMU
1. measuring 3 axis acceleration and gyro (rotation)
A high precision pressure sensor (typical bosch bmp085, bmp180 or bmp285)
A 3 axis magnetometer

In principle very elegant and very usefull.
In real life beware of clones which have more or less same functionallity
Or even fake boards…

GY boards

There exist a number of GY boards - lower number oldest

GY-80, GY-87, GY88, GY88A, GY89, GY91, and HW290(avoid ?)

All are based on IMUs from Invensense and Bosch(pressure)

Please notice the different sensors for same functionallity.

This means you need to download the right drivers

GY boardzz

	GY-80	GY-87	GY-88	GY-88A	GY-91	fake GY-91	HW-290
digital compass 3 axis magnetometer	hmc5883L	hmc5883L	hmc5883L	hmc5983	mpu9250	none	qmc5883
pressure and temperature	bmp085	1 bmp085/180	bmp085/180	bmp180	bmp280	none	bmp085
3 axis accelerometer	adxl345	mpu6050	mpu6050	mpu6050	mpu9250	MPU6000	mpu6050
3 axis digital gyro	l3g4200d	mpu6050	mpu6050	mpu6050	mpu9250	MPU6000	mpu6050
schematics	schematics	schematics	schematics	schematics	schematics	none	schematics

Datasheets

look into datasheet folder

Src folder list: here

beware

HW290 is based on on QMC5883 and NOT HMC5883L read here and find the right driver

QMC5883 is a cheap non compatible clone of hmc5883 - b…shit

See here for library - not tested by me - https://github.com/dthain/QMC5883L

Notes:

on the boards with MPU6050 the the hmc5883L accelerometer is located on a secundary I2C bus behind the MPU6050

See snippets code below

See full code here

#include <Wire.h>
#include <MPU6050.h>
#include <hmc5883l.h>
#include <bmp085.h>
#include "I2Cdev.h"

MPU6050 mpu;
hmc5883l compass;

int error;

void setup() {
  ...
  // 2000 degrees pr second max and +/- 16 g max
  mpu.begin(MPU6050_SCALE_2000DPS, MPU6050_RANGE_16G);

  mpu.setI2CBypassEnabled(true); // set bypass mode for gateway to hmc5883L

  // now we can reach hmc5883L
  compass = hmc5883l(); // Construct a new HMC5883 compass.
  ...

See full code here