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Hi all
i need to get RMS voltage of AC main. the specifications are
5oHz and maximum RMS expected is 230volts.
kindly help in detail. i studied a bit using OP AMP but i am not sure of safety for the resistors Ri and Rf
the link is **broken link removed**
kindly help if someone has better idea
i have used the topology (which only two uc terminals are there) as:
both uc's Rx are shorted and connected with Tx of PC
Tx of only terminal 1 (whose address is 'A') is connected with Rx of PC,
but again when i enter 'A' in hypter terminal, i don't receive a byte from the PC, but when i...
well entire code is not a good educational discussion, however you should try yourself, and if face any problem, you can ask. and by the way it is simplest serial communication.
best of luck
first elaborate a bit more, which stuff you will use, where you want to input your name, and where you want it to be displayed.
Do you want to type it at your PC and display it on 16x2 LCD connected with your 8051 ucontroller?
For first circuit shard by tpetar, if you want to communicate between your PC and ucontroller you should use null modem connection, google it , its construction is simple.
your method is absolutely right, but i think for beginner the nodal method is assign(suppose with a variable) to each node and then apply KCL at each node, you will get as many equations as nodal voltage variables, onward is straight forward linear algebra and you will get your answer and a lot...
the input resistance at non-inverting amplifier shows the internal resistance of the signal source (or the driving circuit), because this image may from some book, and author do care about each point.
The input resistance at inverting (-ve) terminal and the feedback resistance is for adjusting...
actually it is a password based control access system in which only that ucontroller will respond whose address is just broadcast, while the rest will not. and the PC broadcast bytes should be received by all the ucontrollers bc only then control access to shared Tx(ucontroller perspective) line...
i found the problem and its solution:
since the Tx of ucontroller is at ground when no transmit occur from it, thus when the other terminal transmit its byte, the pulses just grounded by the ground voltage of the idle terminal and cannot reach to Rx of the PC,
the solution is that we should just...
it is not a microprocessor or microcontroller alone, its a complete computer of credit card size, now what you have to do is to order it with all its necessary accessories and start with some simple projects using its GPIO port. The language you will need in these projects is python, so better...
communication is successfully carried out using some sort of protocols, and the first and necessary objective of the protocol is to synchronize the receiver and the transmitter which is one bit long in rs232 standard, only then receiver of uart at PC can communicate. this whatever you want is...
you mean my topology shown in fig below is not applicable for rs232 standard,
note in the fig there is one max232 ic but i used this ic with each terminal and hence data in shared medium is in rs232 standard.
only through software at pc and ucontroller will not be enough?
regards
i am designing a prototype of multi microcontrollers with single pc using shared medium. data collision is avoided using software and terminal's address based communication. i used a common Tx Rx and ground of these microcontrollers(terminals) and connected with PC. i have used two...
i know that TTL is digital but from that i mean that it is better that i use extreme values of built in ADC of the microcontroller(uc) 0v to 5v. the voltage is 220 volt rms that i will use to determine. i am using atmega8535 uc in this application
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uc means microcontroller
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