Through Hole Soldering (And Hot Tips on Soldering Headers!)
Bi-Directional Logic Converter Hookup Guide
Binary
Interrupts
Magnetic Fields
Hardware Overview
MAG3110 Details:
3 magnetic field channels
1.95V to 3.6V
supply voltage
Full-scale range of ±1000 µT
Sensitivity of 0.10 µT
Output data rates up to 80Hz
I2C Serial Interface
Pull-up Resistors
As with other SparkFun breakout boards using I2C, this sensor features on-board pull-up resistors to make getting started quick and easy. However, you may need
to disconnect these pull-ups when using other devices on the I2C bus that also have these pull-ups. You can disconnect these by using some solder wick to remove
the solder from the pads on the front of the board highlighted in the image below.
Pin Functions
The MAG3110 breakout doesn’t have many pins, which makes it very easy to hookup! You just need to give it a supply voltage up to 3.6V(VCC), ground (GND), and
the I2C bus lines for communication. These are the SDA and SCL pins.
Symbol
Description
VCC
Supply Voltage (1.95V to 3.6V)
GND
Must be connected to ground
SDA
Serial Data pin for I C Communication
SCL
Serial Clock pin for I C Communication
INT
Interrupt pin -- high when new data is ready
You may notice there is one last pin – the INT pin. This stands for
INT
errupt. Inside the MAG3110 there is a register that can tell you if the sensor has new data for
you to read. The INT pin is hard-wired to this register and outputs a logic high when new data is ready. When you read data from the sensor this register is
automatically cleared to 0.
While you can just continuously read values from the sensor regardless of whether it’s new, this is inefficient both in terms of power and processor cycles. A better
way is to trigger reading data when this pin goes high. But if all you want to do is get a reading and don’t care about efficiency, then don’t worry about connecting this
pin!
If you are an advanced user, the INT pin can be setup by using an external interrupt. Note that I found this difficult to achieve without weird results. I believe the
Arduino Wire (I C) or Serial libraries use interrupts and it conflicts with this. If you are using a different platform, it may work better.
Hardware Assembly
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