Monday had a workshop to explore the physical size of the step bench and its step plates. Our expectations were that 40cm in height was very a normal stepping height, but we would find out that this was way too high to keep up with the rhythm of usual step music.
This height would make it a completely different way of exercising and not what out product is supposed to do.
Prototype of step plates
Yesterday we started to figure out how to make the step plates work. The step is detected by a button that is pushed, when you step at the plate. Therefore we constructed a simple prototype consisting of a buttom plate, a frame, som memory foam and a top plate. Inside this construction in the middle of the frame we placed the button and made a cirquit that would light up an LED when the button was pushed.
Construction of lifting mechanism
After deciding to use the Ikea stool as an inspiration to our lifting mechanism we started make srawing of how it should out. One of the problems with only one thread bar was that the risk of breaking would we very hight due to a high torque in the bar. Besides we decided that one of the main properties of the sep bench is is rectangular form which we would also like out bench to have. Therefore the optimal solution would be have two thread bars inside the bench that would lift each side of the bench synchronous.
Originally we wanted the lower hight of the step bench to be 20cm and the upper height to be 30cm. This does not give us that much space to make the mechanism since the height of all the elements besides the thread bar keeps adding height.
This means that for now our lower height is at 24cm and the upper height is 33 giving difference at 7cm instead of 10.
Drawn in 3D the solution looks like this:
Making this work we need to create a thoroughly planned assembly sequence.
Coding the step sequence
Today we made the first programme that should immitate the step sequence. This code insures that if you press the button new to the shining LED a new LED lights up.
Later on we created a counting system and a timer making it possible to give a point if the button is pushed before the time runs out. The final score is calculated in percent and written on the serial monitor.