Bat Mobile

8/14/2019 Bat Mobile

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Working Model

ofSolar Bat-mo-bile

Presented By Shashank

bhatnagar&

Gaurav sethi


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The Zener-based solar engineUsing a Zener diode as a voltage sensor

The Zener solar engine is, as its name implies, asimple type 1 solar engine based on aZener diode. This is the original solar enginedesign, by Mark Tilden, no less!

Introduction:-
http://encyclobeamia.solarbotics.net/articles/zener.htmlhttp://encyclobeamia.solarbotics.net/articles/zener.html


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The capacitor charges until the PNP transistor(here shown as a 2N3906, but you could also usea BC327) receives basecurrent through the Zenerand turns on. Then the NPN transistor (here shownas a 2N3904, but you could also use a BC337)

turns on and the capacitor is discharged throughthe motor. As the NPN turns on the 2.2K resistorstarts to supply basecurrent to the PNP and thecircuit snaps on. When the capacitor voltage drops

below about 1V, the the PNP turns off, the NPNturns off and disconnects the motor from thecapacitor which starts to charge up again.

How it works (simplified)
http://encyclobeamia.solarbotics.net/articles/pnp.htmlhttp://library.solarbotics.net/pieces/parts_elect_semic.htmlhttp://encyclobeamia.solarbotics.net/articles/base.htmlhttp://encyclobeamia.solarbotics.net/articles/current.htmlhttp://encyclobeamia.solarbotics.net/articles/zener.htmlhttp://encyclobeamia.solarbotics.net/articles/npn.htmlhttp://library.solarbotics.net/pieces/parts_elect_semic.htmlhttp://encyclobeamia.solarbotics.net/articles/npn.htmlhttp://encyclobeamia.solarbotics.net/articles/base.htmlhttp://encyclobeamia.solarbotics.net/articles/current.htmlhttp://encyclobeamia.solarbotics.net/articles/pnp.htmlhttp://encyclobeamia.solarbotics.net/articles/pnp.htmlhttp://encyclobeamia.solarbotics.net/articles/npn.htmlhttp://encyclobeamia.solarbotics.net/articles/npn.htmlhttp://encyclobeamia.solarbotics.net/articles/pnp.htmlhttp://encyclobeamia.solarbotics.net/articles/pnp.htmlhttp://encyclobeamia.solarbotics.net/articles/current.htmlhttp://encyclobeamia.solarbotics.net/articles/base.htmlhttp://encyclobeamia.solarbotics.net/articles/npn.htmlhttp://library.solarbotics.net/pieces/parts_elect_semic.htmlhttp://encyclobeamia.solarbotics.net/articles/npn.htmlhttp://encyclobeamia.solarbotics.net/articles/zener.htmlhttp://encyclobeamia.solarbotics.net/articles/current.htmlhttp://encyclobeamia.solarbotics.net/articles/base.htmlhttp://library.solarbotics.net/pieces/parts_elect_semic.htmlhttp://encyclobeamia.solarbotics.net/articles/pnp.html


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With the 2.2K resistor connected to the NPNcollector the circuit behavior is morecomplicated and first we look at how it affectsthe SE triggering process.

When the Zener starts to turn on the Zenercurrent flows through the 2.2 K resistor and themotor winding and generates a voltage at thebase of the NPN equal to V = I x R (ohm's law).

But no current can flow through the PNPbaseuntil the base / emitter voltage is about 0.55 V.That means you need a minimum current of I =E / R or about 0.25 mA through the 2.2 K resistorbefore any current even starts to flow in the PNP

base.

FEEDBACK
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Sometimes a capacitor is placed in parallel withthe motor winding. Remember that an inductor in

parallel with a capacitor forms a resonant circuitin which at one frequency the signal lossesapproach zero and small voltage oscillations buildup to become large oscillations. Add some

transistors and feedback and there is a tendencyfor the circuit operation to stabilize around thisparticular instability, generating acoustic noiseand vibration in the motor windings instead of

motor rotation

One more comment


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FUTURE ASPECTS

THE MACHINE CAN BEUPGRADED BY INCLUDING

SOME SENSING DEVICESSUCH AS BUMPSENSORS,LIGHT DETECTING

SENSORS ETC


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IR SENSOR BASED SOLARCAR

In ir sensor based car, the

car will able to controlled byIR sensor. and it will detectthe ir radiation and followthe objective path and catchthe light from where thelight will be coming.


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Bump SensorsWork on bump sensor systemsfor cars has been going on sincethe 1950s, but that earlier workdid not lead to practicalproducts. The paper reviews

some of that earlier work, andshows how recent technologicaladvances have now madeautomotive radar practical. It

also shows some resultsobtained from current work inthis field.


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Conclusion:-TheBat-mobile is a `wild robot' - there is no switch

to turn it off. I once parked the prototype in a darkcorner, with a piece of cloth covering the solar

panel. A day later it was caught in an attempt to

very slowly wriggle free! But it is still a very primitive

beast, not at all capable of looking after itself in a

randomly chosen environment.

Is there a future in this, one may wonder. Will

something like the Bat-mobile ever lead to a useful

kind of wild robot, or is it just a toy, a dead end as

far as the development of robots is concerned?What will a realrobot come to look like? Certainly

not like Commander Data from Star Trek. There will

always be cheaper ways to make something that so

closely resembles a man.


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Many chores we would gladly have a robot

do - vacuuming the house, mowing the gras

- demand something smaller, equipped with

tools for the job. Even better would be a

robot with more than one body: a collectiveorganism. Then if you had a larger house or

lawn, you wouldn't need another model, just

more of the same robot. The advantage isn't

just cheaper mass production. A collectiveorganism never breaks down! The many littl

sub-robots divide the work between them,

and automatically take over from one that

stops. The robot as a whole continues, even

if most of his `body' is defective. It will just

mow or vacuum a bit slower. And repair is

easy. You just buy a few more sub-robots.

Small and simple really do have the future.


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