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[SOLVED] high speed parallel data to serial converter

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genius1990

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hi all,
i have a doubt regarding uart..
i hope all of you are familiar with the 434 mhz transmitter ic..if not it is a rf transmitter that accepts serial data at 1000bps and transmits it to the reciever.
so i wold like to know if there is a ic chip to perform parallel to serial conversion like uart system. each of the parallel inputs will be pwm sinals of time period .01 seconds. the obtained serial signal can be transmitted easily.\bar{}
thanks i needed this for my mini project.
thanks.
 

hi all.
please do help if you know about this .i need a transmitter and reviever via rf with a minimum range of 50 meters.
The transmitter needs to transmit 4 pwm signals each of .01 seconds time period and the
reciever which is at a distance of 50 meters from the transmitter
needs to recieve this same 4 signals . ie the 4 signals needs to be
transmitter to the receiver..
Sir do you know of any circuit that can perform this task.
Thanks for your help.
 

you should be able to use a clock and a ttl ic to do this job

74HCT165 is a parallel to serial converter

it runs from a clock
to clock in each bit of data
if you want an exact rate like .01 sec then multiply it by 4 for the clock freq
you can also oversample the ttl to avoid any miss reads

try that...

but remember its 8bit so you can use this to supply other channels as needed
or as check bits or flags
same use the lower 4 bits to supply what one its sending
etc etc

**broken link removed**

or you can use a small pic like a pic16F84 it will also allow this task
with i would say a far greater level of control and its about the same price and size
and will use maybe less current and also less external components
 
hi vsmvdd
thanks ..but there is a small problem if i use the ic u mentioned i need extra circuitry to control the parallel load of serial shift pin...but the encoder ht 640 doesnt need such a input pin..
all it takes as input is 8 bits of data. and address and the transmit enable key..
the main problem i found with the ic is that the 8 inputs should not have any transitions with time period less than 1 second..in other words all the 8 inputs may have frequenct 1 hz or less ..but not more.
what i wanted was to encode 4 pwm signals for parallel transmission...so is it possible to increase the frequency of encoder to accept input signals with frequency of 100 hz ..
thanks
 

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