diff --git a/README.md b/README.md index 752be66e71c33ba9da8feb354e5998ad162c6250..7c793786e8a3e63dea1366fcaa050759d3a6cf2a 100644 --- a/README.md +++ b/README.md @@ -48,17 +48,6 @@ Finally, we can plot the relation between the two variables (force and hall read ### 6 DOF Loadcell - - -<a href='as5013-test'>as5013-test/</a> contains pcb source files for a board to evaluate 3d tracking using the AS5013 (nominally an 8-bit 2-axis device). This IC contains an array of 5 hall effect elements for measuring $B_z$, sampled to 12-bits internally with these raw values available over I2C. - -<img src='as5013-test/testing2.jpg' width=350px> -<img src='as5013-test/nrf52-as5013-board.jpg' width=400px> - -To characterize the use of the AS5013 as a three-dimensional tracking device, we use a 5 axis stage (2 axes motorized, 3 manual) built around two Thorlabs PT1M micrometer stages. After setting a magnet height and orientation, we can sample the 5 hall elements over a two dimensional array of magnet displacements. Executing this for a handful of magnet heights should let us fit functions for X, Y, and Z in terms of the 5 hall readings. - -## 6 DOF Concept - A concept for a 6 degree of freedom magnetic load cell is shown below. It uses a pair of flexures (aluminum or titanium plates on top and bottom) to set relative stiffnesses of Fx, Fy, Fz, Tx, Ty, Tz. A central rod carries a disk with four small neodymium magnets which moves when loads are applied. Four AS5013 hall array ICs are positioned just below the rest positions of the magnets on a single PCB. M3 standoffs and screws hold the entire stack together. <img src='v1/img/screenshot1.png' width=400px> @@ -73,3 +62,12 @@ Fusion 360 lets us quickly test loading cases for flexure designs. Below are si <img src='v1/img/flexure-twist.mp4' width=300px> +Building on the experiments with the AS5510, we explore the use of the AS5013 to perform 3-dimensional tracking of a magnet. This IC is nominally an 8-bit 2 axis magnetic encoder, though it contains 5 hall effect sensors, each with 12-bit resolution, adjustable gains, and I2C-accessible raw values. <a href='as5013-test'>as5013-test/</a> contains pcb source files for a board to evaluate this measurement. + +<img src='as5013-test/testing2.jpg' width=350px> +<img src='as5013-test/nrf52-as5013-board.jpg' width=400px> + +To characterize the use of the AS5013 as a three-dimensional tracking device, we use a 5 axis stage (2 axes motorized, 3 manual) built around two Thorlabs PT1M micrometer stages. After setting a magnet height and orientation, we can sample the 5 hall elements over a two dimensional array of magnet displacements. Executing this for a handful of magnet heights should let us fit functions for X, Y, and Z in terms of the 5 hall readings. + + +