Basic setup to test HMC5883 on GY-273
Real images:
Just connect: GND, VCC (5V), SCL and SDA (I2C standard signals) to your Arduino. Older versions could use A4 for SDA and A5 for SCL, but with most up-to-date boards appropriate dedicated pins (see green and purple connection lines) could be used,
And another image with shorter connectors:
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