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8051 MIcrocontroller workshop

I conducted a workshop in our college on 8051 microcontroller for the 2nd year students on 23rd and 24th of this month.
It included practical hands on session of led interfacing, sensor interfacing , stepper motor interfacing and serial communication with computer and L293d for bidirectional d.c . motor motion along with the theory classes.

duplex communication using DTMF tones

hello guys!!!!

As requested bysome of the sun campus ambassadors to have a duplex communication I together with JAI have started working on it and we are surely going to come up with a solution within days.

we have founded a DTMF generator ic which we will interface on the receiving end where the robot car was actually placed and then we are trying to send back the dtmf tones to the caller which wll be indicative of some feedback.

Thereby the overall system will be completely automated from both sides.
observing the interest of the readers in this project i have tried to interface the complete circuit with the AC power supply to completely automate the switch board of my room.

details and the circuit of which will be posted soon.!!!!

Latest in Our pocket!!!!!

My team is working on the interface of this circuit with The VERY KNOWN "SUNSPOT" to create a unique globally controlled BIPEDAL Robo.

We have successfully interfaced the sun spot with this mobile circuit and are ready to make things operate globally from anywhere in the world.

IMAGES to be uploaded soon!!!!!!!

my mobile Robo

Mobile controlled Robot

This is the complete detail you can have to create your own Global Robo that can be driven by sending DTMF tones from your mobile phone!!!!!!! "" Yes!! your mobile phone""

All you need to do is to have a DTMF tone decoder IC and some capacitors and resisors to complete the circuitry along with two mobile phones and a headphone for inputting the DTMF tones into the circuitry and u r done.

The complete list of bill of materials is provided below along with the circuitry with a little explanation of how the complete circuit works.

Bill of Materials:
MT8870 dtmf decoder ic
100k resitor 2pc.
300k resistor 1pc.
3.57945Mhz crystal oscillator
0.1 uf capacitor 2pc.
4 LED
connecting wires....

Working: while the input from the mobile using a headphone is connected b/w the 0.1uf capacitor and the ground, DTMF tones can be transferred to the decoder ic(8870) and once the ic is powered up the o/p can be seen by connecting LED's at Q!, Q2, Q3 and Q4 o/p of the decoder ic.
The output on the Q1 to Q4 pins of the decoder IC has been shown in the image.

the o/p of the decoder ic then can be connected to a motor driver ic like(L298 or L293D) to drive some motors or relays as a switch to operate some devices remotely as the Mobile phone connected can be called from anywhere in the world and by pressing the keys the DTMF tones can be transmitted to the receiving end mobile and hence any device connected can be operated globally.

As soon i get a camera i will Upload the image of my circuit and the robo i made and operated using my mobile phone.