Arduino - GY80 GY87 GY88

updated April 2022 - JDN

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-87, GY88, GY88A, GY89, GY91

All are based on IMUs from Invensense

Please notice the different sensors for same functionallity.

This means you need to download the right drivers

	GY-80	GY-87	GY-88	GY-88A	GY-91	HW-290
digital compass	hmc5883L	hmc5883L	hmc5883L	hmc5983	mpu9250	qmc5883L
pressure and temperature	bmp085	1 bmp085/180	bmp085/180	bmp180	bmp280
3 axis accelerometer	adxl345	mpu6050	mpu6050	mpu6050	mpu9250
3 axis digital gyro	l3g4200d	mpu6050	mpu6050	mpu6050	mpu9250
schematics	schematics	schematics	schematics	som gy88 dog HMC5983	schematics

Data sheets

Drivers

All drivers is a zip file you instal in your Arduino IDE by menu sketch -> include library -> add ZIP library

BEFORE starting install drivers you must install I2Cdev driver (link below)

i2c driver - needed by all
- 2C driver
specific drivers

Notice: AFAIR

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.
  ...

Arduino drivercode

Unzip the zip files in youe … arduinosketchbooklibraries directory See in ardunio Preferences where your sketcbook directory is located. You can find libraries directory in the sketchbook directory.

See libraries for zipfiles

NB NB NB : in some of the democode they initalise the serial port to 9600 and in some to 115200
Check it so you can adjust your arduino terminal to same speed.