Still working on the project. POC finished today and tried. Also found some more physics concepts.

For a free floating target (theoretical) of 1m2 weighing 4kg. If the accelerometer reads 1g (9.8m/s2), then the force is F=ma = 4 * 1* 9.8 = 39.2

Since the ball weighing 0.45kg is travelling at a constant speed when it hits F=mA does not apply, but instead use F=1/2mv2. making v = sqrt(2*F /m). = sqrt (2 *39.2 /0.45) = sqrt(174.2) = 13.2 m/s. [this comes straight from a physics example problem, just updated the numbers to my setup]

Problem is the target is not free floating. It is hanging from its top edge. I assume moment of inertia comes in to play here. But haven't found the nugget to explain how. I would expect the answer will affect line 1, to find that f=ma doesn't directly apply.

In testing. I hit the target and received a maximum reading of 568. The sensor zero reading is 400. The sensor is supposed to be idle at 1.65V (1.65/5*1024 = 338), but the reading of 400 shows an offset. 3.3V should be 675 counts. Not sure which way is correct (investigation still needed). The results of the two options are.

zero=400, maximum = 675, range =200g, 568 = 122g based on the math (568-400)/275 * 200

or

zero=400, maximum = 800, range =200g, 568 = 84g based on the math (568-400)/400 * 200

On the free floating target 122g = 146 m/s and 84g = 120m/s. Somehow I don't think I can kick that hard. Therefore I must conclude, I need information on the targets force equation. Anyone know the force equation for the hanging target described above?