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This is part two of my Hall-Effect Sensor Trilogy.

It is best to read the first part if you haven’t first:

Tim’s Electronic Dividers [1D] : 13 Steps (with Pictures) - Instructables
In this instructable I will be using two 49E Sensors, each with two magnets in the same way I used them with the Dividers.

A 3D Printer is needed for this one, as the accuracy of construction is definitely a key element.

I will be using an Arduino NANO as before with an LCD to show coordinates, but to do something practical with the output an application is required to give a graphical representation of the data.

I have made an application to do this.
This project requires:

The basic understanding of the Arduino Platform.
For recreating the trace, some knowledge G-Code.


- Two 49E Linear Hall-Effect Sensor.
- Four Neodymium Magnets. Width: 5mm, Depth: 5mm, Height: 2mm. (North/South is in the 2mm direction)
- A tool to find the poles of the magnets. I used my phone with an application.
- Arduino NANO.
- 1602 Display with an I2C Interface. (PCF8575 Adapter)
- Cable
- Push Button 6mm x 6mm x 5mm Through hole.
- Two 8mm diameter rods x 171mm long.
- Several M1.7x6mm Self Tapping Screws.
- 3mm diameter rod. 30mm long.
- A sheet of 3mm Hardboard.
- Some Glue, I use UV resin.
- A 3D Printer is required to print the parts for the Pantograph.”

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