Exercise Bike Generator

Hi,

It is gives more efficiency if you can charge the separate battery from the coupled DC generator to the bike rather than try to control directly your applications.

Measure the voltage output from the DC generator and if it is enough to charge Battery then gives a signal to turn on the Monitor power supply.If low turn off the supply.

Mechanical relay or Trac can be used to switching application.

Microcontroller or Logic circuit can be designed to sense the voltage readings.

From that you can use Battery power to DC light system, USB power and what u need. You can also do invert it to 230 v.

You can find the data from energy guide what should be the RPM for better calories burning and from that you can sense the RPM and design controlling according to RPM.

RPM can be sense DC Generator back EMF Energy calibration or other sensors.

Thanks

Tharindu Chandimal

Thank you for your response.

I am reluctant to use a battery because my purpose is to have my son pedel while hs is playing games; if I use a battery, he can stop pedeling once the battery is charged.

I was just re-reading your post and looking at your diagram -- it appears I may have misunderstood what you are suggesting.

From what I think you are saying, I could, simply, use a switch which allows current to pass to the monitor.

So, can I just plug the monitor into the AC house current and use the provided transformer to turn on the monitor.  Then, have an On/Off switch (a relay switch ?) which allows the current to pass on to the monitor if the pedels are moving; but, if my son stops pedeling, the switch would open the circuit and prevent the passage of current to the monitor?

Hi Richard,

Here's a quick way to achieve the goal but is a different manner:

1. Get a bicycle dynamo, and assuming you can mechanically connect it to the excercise bike

2. Get a 12V relay, and connect the dynamo to the 'coil' pins on the relay

3. Find a monitor cable that you don't mind destroying, and find a wire in there that if you break, will cause the image to disappear. Once you've found it, connect up two pins on the relay to the two wire breaks. Connect the 'Common' pin of the relay to one break, and the 'normally open' end to the other. Keep wiring short here, otherwise you could cause a poor image, or no image at all.

This method requires very little electronics knowledge, and is safer than connecting to the mains. Others may have different ideas.

You can program a microcontroller to control sending power prom battery. Then connect the monitor to the battery via controlling cct.

I suggest battery because its provides constant dc supply and it’s protect the devises from fluctuating power.

Once battery fully charged it reaches its stranded terminal voltage and current. If it dissipates through monitor it reduces the stored power little bit. You can sense even small variation of voltage and current.

Let’s say its loose 12 v to  11.4 v within 5 minutes. Then sense that cut off limit and program the MCU to switch of the Cct..

Then he has to paddle again after 5 mints to turn on his monitor. From that you can improve your timing to doing several tests.

Second thing is finding exact 12 v dc generator and add capacitor banks which has higher discharging time 12 regulator. let say close to at leaset 50  seconds.

Then not need a battery and if the RPM is low capacitor bank gives some constant output for limited time.but this suddenly turn off the device after discharging the capacitor bank. but it can handle variation of RPM and gives sufficient out put for limited period.

The exercise bike has a speed indicator (based upon a magnet on the wheel which passes a sensor on each revolution of the wheel).  I think I can use the speed indicator to monitor the speed -- this information would, then, be used to activate a relay switch to close a circuit if the speed is at a certain minimum setting.