After having visited a gym for spin-bike similar to that of the photo, 


I thought about the possible use of the glasses dipped uses you in precedence for the simulator to join with a spin-bike 

This way in the year 2001 have begun the realization of the simulator that you can see in the photo. 


 other photos 


Idea is that to visualize in the glasses dipped you the tape of a road run, done of: lowlands, slopes and steep slopes.  



The speed of advancement of the tape, has to be tied up to the speed of the pedaled one. 

Besides, according to the inclination that he is facing, it has to change the hardness of the pedal. 


I have purchased therefore a room bike provided of regulation of braked and of speedometer. And' one of the least expensive ones in commerce, but it possesses the necessary to bring forth a feasibility study. 

The bike uses a badminton connected by a chain to the pedals. This badminton is braked by a ribbon of fiber wound along its diameter, screwing a knob set on the handlebar, a small steel rope curtains the ribbon wound on the badminton, regulating so the hardness of the pedal. 


I have removed therefore the knob, and I have realized a system with a motor I footstep-pass that (as the knob) it throws or it releases the small steel rope  increasing or decreasing the hardness of the pedal. 

Obviously, the motor footstep-footstep, is commanded by a computer that it syncronizes the video in base to the projection in the glasses dipped you of a run in: lowland, climbed or climbed steep, with the tension of the small rope and therefore the hardness of the pedaled one. 



As already mentioned, the speed of slide of the video is syncronized with the speed of the pedaled one. To realize this I have exploited the small rope of the speedometer set on the bike. 

After having opportunely cut it, I have glued to her extremity a piece of magnet that to every turn of the pedal passing before to a cruet reed closes the contact of it.  


The usual computer calculates the time that intervenes among two closings of the contact reed, and therefore it modifies the speed of reproduction of the tape. 




After various searches on internet,    it visualizes video 


     visualizes video


  not finding one of them valid, I have decided to take my television camera, to stare at it on the auto and to realize the resumption along a run they climb on. 


The first problem that has risen has been that of the shot during the curves: if the television camera stays fixed, to the left the curves involve a loss of the central vision for the right side of the road, while with those to the right, that is mostly framed to the left. 

To resolve the problem, has decided to realize a something that, following the swerve of the auto, it rotated in the same direction the television camera. 


 other photos


After opportune regulations, I have found the correct relationship between swerve and shot in curve.


But another problem is introduced: the tape has to give the feeling of a run in the lowland or in slope. 

To do this is necessary that: how much a run is anymore in slope, so much the horizon has anymore to be aloft respect the shot. 

I have realized therefore one I untie on the fixing of the television camera to direct downward her or the tall one according to the run. 


The result of the tapes you can see it following 

Download  video. mpg (3 mega)

Download video .mpg (2.36 mega)

So much to complicate me the life, has introduced the possibility of choice of the difficulty of the run: beginner, dilettante and expert. 


According to the choice, the pedal has different hardness of base, a biginner in the walk in the lowland for instance has a hardness of the pedal that is smaller of that of the expert, but greater of that of the beginner. 



I have used VISUAL BASIC: 



To his start, it performs an alignment of the motor step-step, while outside the field a voice invites to choose through a button the type of difficulty: beginner, amateur, experienced. 


 Performed the selection another pulsating it gives the start. 


To this point the tape departs with a walk in lowland to which an opportune sonorous column is in partnership, after a run of 2 kms he passes to the slope (other sonorous column), then again in the lowland therefore to the steep slope and so street for a total run of 15 kms. 

Every 40 second best man in sovraimpressione on the video:   crossed km, departed time, middle speed. 

I have used parallel interface port. 

you see electric scheme


For the debugging of the various hardness of the pedal, I have realized some buttons with three keys:  

1) it increases hardness 2) it decreases hardness 3) it selects the type of inclination and difficulty. 




Having realized how much above, it was a sin not to quickly realize an applicable system to the professional SPIN_BIKE, 




always in degree as the preceding bike, to check the hardness of the pedaled one as well as her speed. 

It is born so a group constituted by two pliers dressed again of ferodo, moved by the usual motor I footstep-pass that, according to the command imparted by the computer, they tighten the badminton in steel increasing the resistance of the pedal. 





photo 1

photo 2

The sensor of the speed of the pedaled one cannot be realized with the cruet anymore reed, in how much the speed of the disk is too raised and he would risk of it loses some passages of the magnet fixed to the badminton of the SPIN-BIKE.  

I have, therefore, realized a system to faster survey, composed by two leds to infrared (insensitive to the natural light): an emitter and the other receiver, sideways fixed to one of the two pliers. On the badminton is glued a self-sticking plastic strip of white color that reflects the light sent forth by the diode emitter toward the receiver to her passage. The everything is sent to the same entry of the computer predisposed for the cruet reed. 





Obviously to the group they are connected two buttons: one for the START and one for the Selection difficulty (beginner ,amateur and expert). 






it is interest training SPIN

The cost of the material solo is enough tall, if we consider that the system can satisfy an alone utilizzatore for time. 

I cost P.C. without monitor 600,00
motor step-step 60,00
electronic component  50,00
buttons 20,00
immersive glasses 500,00
manpower 500,00
management 500,00
TOTAL 2230,00






In the gyms of spin-bike, two types of frequenters exist: 1) those assiduous that constitute the hard core. 2) those irregular, that frequent for a few months and then abandon. 

Both the first ones and the seconds, even if in different times, they face a period of tired due to the continuity of the activity, from here the idea of the spin-aerobics, spin-boxe etc.... 

It misses in effects an essential element: the competition.  

Normally every subject makes harder pedals it through a handle grip that doesn't have an absolute indicator of the resistance of the pedal, besides the bike doesn't have a measurer that allows to visualize on screen and therefore to compare in real time the crossed kilometers. It has therefore little sense to think to a true competition. 

The system that I have realized, allows to have both the requisite. 

What important!   anybody change must be performs on the present spin-bikes in the gyms. The installation is rapid and the setting of every group frenante is managed in phase of activation in fast way. 

The possibility to choose the degree of difficulty (beginner and expert) it opens the competition to everybody. 

We can reasonably think that introducing this novelty of completion to the activity,  




 is single                   




what of group,                    



the result could be well approved from who the practice. 

And the costs??? 

                        no glasses dipped you any tape 





After various reflections, I have thought to a system composed by a central unity, managed by the classical PIC-16f84 that checks a display that points out the kms crossed by every bike 


and so many peripheral unities similar to the group that brakes for spin already previously illustrated, to whose intern a PIC-16f84 it manages the motor for brakes it and the sensor of the turns of the badminton sending the information to the central unity of which above. 

On every single bike, through a changer, it is possible to choose the degree of difficulty (beginner and expert). 

During the use, the bike of the instructor allows to command the hardness of the pedal of all the bikes to simulate the runs in: lowland, slope and steep slope. If on a bike the choice has been effected: beginner, the hardness of the pedaled one will be smaller in comparison to that bike that has selected beginner or experienced.  

Obviously during the competition (contratiamente to the training) it is opportune taht the selection of the difficulty is equal for everybody. 


I have realized a prototype on the bread-board with two peripheral and a central unity, with only two lines of led of the display. And' is a complicated pò to make to turn the software, considering that the speed and the disposition memory of the PIC they are limited. 

The everything dearly works, but if I had to propose one of them definitive, I would use at least a PIC-16f628 



see scheme


As a rule the cost of the material and assemblage of a Kit I complete for 8 BIKE should be the following: 


CENTRAL UNIT  COMPREHENSIVE OF: Feeder Whole System + PIC + Encircled Electronic + COMPONENTS 104
Mechanics Group X 8 BIKE 1040
Accessories you Launch 240
TOTAL 1699

Surely few in comparison to the single system with glasses dipped you. 



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