Recent content by FYP

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    final year project: a blind stick that uses different sensors, help needed

    ;D then i think its better for me to go to the microcontroller section. i have feeling this topic wont stop here :) you helped me a lot...thank you
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    final year project: a blind stick that uses different sensors, help needed

    Hello recently im doing the software part...is it ok to put my software problems here or should i open a new topic ? thank you :)
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    final year project: a blind stick that uses different sensors, help needed

    well i was thinking about using the analog output since its straight forward, but then i found out its reversed all over. about the PWM...do i have to use microcontroller to make it work as i want? is there's other way i could use to deal with PWM instead of software implementation ? thank you
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    final year project: a blind stick that uses different sensors, help needed

    hello again recently im facing s problem in the Ultrasonic sensor that im using, the ultrasonic im using is LV-Maxsonar-EZ1, its a great sensor that can give different types of outputs like Analog and digital outputs. here's the datasheet of the sensor...
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    final year project: a blind stick that uses different sensors, help needed

    im very sorry..i think i used the wrong equation...ok R1= 3.3k R2= 2.2k i went through the datasheet...well im not that good at reading datasheets...i get really confused. but i guess ur point is the motor can't be connected directly to LM393 without motor drive. rit ? i hope you dont get...
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    final year project: a blind stick that uses different sensors, help needed

    for R2...i did get 1.6V from this equation...but the thing is the nearest resistance value that can be found in market is 4k7 (i guess) thats why i wrote  R≈4.7k. regarding RL...well i think its the load thats going to b connected (i.e. motor) Rv is represents that input device. rit ?
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    final year project: a blind stick that uses different sensors, help needed

    alright...i went through all websites. ok lets say i choose this simple comparator : and lets say i want the comparator to trigger ON when the input reaches almost 2V. the equation used is Vref = (R2 /R1+R2) * Vcc substitute Vref=2V , Vcc=5V R1=3R2/7,  lets say R1= 10K R2≈4.7k am i still on...
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    final year project: a blind stick that uses different sensors, help needed

    thank you well the deadline for the whole project is after 4 months, plus i have other subjects and projects so i cant concentrate on this one alone although its the most important. i found my circuit in one of ur links...calculating the resistances values right now. thank you again
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    final year project: a blind stick that uses different sensors, help needed

    can you please show what is the suitable circuit of a comparator that triggers on when the voltage reach lets say 2V ? power source is 5V, using LM324 or anything better. thank you
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    how can i charge a LiPo battery ?

    thank you...small note: the battery type is LiPo (Lithium polymer) not Li-ion :)
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    how can i charge a LiPo battery ?

    sorry but how did you know (or assume ) that the battery should not be charged at a current higher than 400mA ? the instruction didn't mention that....here are the instruction given: # Do prevent the battery output from short circuit. # Do use battery with specified equipment. # Do not get...
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    how can i charge a LiPo battery ?

    hi again I want to use a LiPo battery for my recent project as its cheap and efficient. the problem is the battery that i found has the following specifications: 7.4V, 800mA, 10 cell and the LiPo charger i found have the following specifications: 7.4V, 600mA, 2 cell as you can see, the...
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    how can i reduce current of 1A to less than 50mA

    if i put a series resistor...the resistor will be damaged due to the exceeded power dissipation i guess, correct me if im wrong plz. any way this is the circuit im using: thank you
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    how can i reduce current of 1A to less than 50mA

    Hi every1 its a simple question actually, i wan to build an IR sensor which works on a power source of 5V, 10mA...the problem is my power source is 5V,1A which might damage the IR TX & RX, so i need to reduce the current. i tried to connect parallel resistor ( in Crocodile) but the power...
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    final year project: a blind stick that uses different sensors, help needed

    ok...i'll start working on the amplification circuit soon...and i'll upload a picture of circuit im constructing...note that i need the output of the amp ( the input is connected to the ultrasonic sensor) to be giving a variable voltage starting from 0 to 5 or 7 volt depending on the distance of...
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