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Tuesday, February 19, 2008


The world we live in is a complex place. We have many senses to help us to understand our surroundings. In order to safely move around robots also need some way of understanding their world. The easiest way of doing this is to add simple sensors to you robot.

Bump Sensor:

So, you've fitted some motors to your robot and its happily driving around but it probably keeps colliding with obstacles and getting stuck. You need a way for your robot to detect collisions and move around objects. Enter the humble bump sensor:

A bump sensor is probably one of the easiest ways of letting your robot know it's collided with something. The simplest way to do this is to fix a micro switch to the front of your robot in a way so that when it collides the switch will get pushed in, making an electrical connection. Normally the switch will be held open by an internal spring.

Micro switches are easy to connect to micro controllers because they are either off or on, making them digital. All micro controllers are digital, so this is a match made in heaven. Micro switch 'bump' sensors are easily connected to the Robocore, simply plug them into any free digital socket and away you go.

The following diagram shows a typical circuit for a micro switch bump sensor. The resistor is important because it holds the signal line at ground while the switch is off. Without it the signal line is effectively 'floating' because there is nothing connected to it, and may cause unreliable readings as the processor tries to decide if the line is on or off.

Light Sensor:

Light sensors are perfect for making your robot more interesting. With some light sensors you can make your robot follow a light, hide in the dark or even turn on some funky headlights if the light level got a bit low (under a table for example).

Light sensors are basically resistors that change their value according to how much light is shining onto them.

They are easy to connect to the Robocore, with a simple circuit they can be plugged straight into a free analogue socket. Getting results from them can't be simpler. Get the processor to take a reading from the socket that the sensors connected to. A high value means not much light is falling on the sensor; a low value means a lot of light is falling on the sensor.

More info will b updated soon...........


Arun Vijay said...

nice !!
Send it to me .
Arun Vijay

ρяαу 4 мє ℓєт му ∂яєαмѕ ¢мє тяυє.. said...

hey jst send me the detaiks of line follower to my mail ..

Anonymous said...

plz send to me the info about th e line follower
any mail:

mayank said...

plz give the info..thanks

harsha said...

where is the circuit for micro switch bump sensor? Please mail it to