Here I made a smart AC plug using an arduino pro mini .We can on and off any AC device using this smart ac plug via android mobile. We can control it through our voice and by tapping on the screen by connecting the mobile to the ac plug through bluetooth. It's main advantage is it is not need to put inside the switch board it only need to plug in to switch board socket and connect devices like table fan, table lamp etc... This circuit can also use inside the switch board.
Here I'am showing how to make a arduino light seeking(follower) robot . Made using arduino pro mini it's very cheap I ally used 7$ (450 Indian rupee) to make this robot. This robot can find the door of the house by following light.
This is my robot for many purposes ,made using arduino and some other sensors. This robot can function as obstacle avoider, bluetooth controlled robot etc. it sense fire ,smoke,gas and any of them detected it make alarm sound. We can use this robot in home for security and use as pet.
Here is a simple fire alarm circuit built around 555 timer ic, A reverse biased germanium diode i used here as a heat sensor. At room temperature the reverse resistance of the diode-being very high (over 10 Kilohm), it produces no effect on transistor T1 which conducts and keeps the reset pin (4) of IC1 at "ground"level, and so he alarm does not sound When temperature in the vicinity of diode D1 (the sensor)increases in case of a fire the reverse resistance of D1 drops.At about 70 c its resistance drops to a value below 1 -kiliohms. This stops conduction and the IC's reset pin (4)becomes positive through resistor R2,which sounds tha alarm.
For installation of the alarm,two or three reverse biased germanium diodes connected in parallel can be kept at different locations. In case of a fire any of the diodes can sense the heat and raise the alarm. DR 25 diode works as a sensor but base-emitter junction of such germanium translstors as AC128 AC188 or 2N360 can also be used.
Here I made a simple alarm circuit using some common components . It s work on the basis of light.When anyone take the box with alarm system it make buzzer sound. we can integrate it with some other things like traveling bags etc.
You can modifie the circuit by adding thermister. (10k)Then you can use it as fire alarm also
This robot I made for a lot of purposes like security,helping agent
etc... . It have many salient features.It work under our control or
automatic mode. We can control it by android mobiles, using our figures
by wearing a gloves with radio controller. I want to make it maximum cheap price there
for I'am using low cost motor and without servos it.
