Discussion in "Hardware" started by    helloleong    Aug 30, 2010.
Mon Aug 30 2010, 02:27 AM
#1
So this is the circuit:


The data are transfer from 1 PCB to another PCB with a connector.
Should the data line attach to a pull up resistor?
Should the data attach any resistor and TVS (protection cuicuit)?
Is this connection correct?


Mon Aug 30 2010, 03:03 AM
#2
would depend on the kind of outputs the devices sport....whether open collector or equipped with internal pullups etc.

the tvs wouldn't be necessary unless the two devices are at different logic levels.

some more info on the 2 mcu's would help.
 helloleong like this.
Mon Aug 30 2010, 03:08 AM
#3
Hi sashijoseph, thanks for your reply.

The receiver is a PIC16F727, and the sender im not sure what mcu they are using, because is a ready make electromagnetic module to send out card wiegand data.

May i ask what do you mean by different logic level? Can the data line connect just using 1 wire without any other resistor or protection circuit?

Thanks you.


[ Edited Mon Aug 30 2010, 03:11 AM ]
Mon Aug 30 2010, 03:34 AM
#4
some devices operate on 3.3v levels,some like your PIC on 5v and some interfaces like RS232 on -12 to +12 volts.

if your sender is only outputting signals to the pic and not receiving any from the pic,you may connect them directly,assuming the sender is using either 3.3v or 5v logic.

do you have a datasheet of the sender or any information....make,brand etc
 helloleong like this.
Mon Aug 30 2010, 04:10 AM
#5
Thanks sashijoseph. Really learn something from you. Thanks

The sender is EL100-01 OEM Reader Module also operate on 5v.

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raj2555
how to interface 8051 microcontroller with NRF24L01+ module
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Log in.. then post your code in the 8051 forum
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i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
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I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
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Thank you for your time,
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Hello. Please I won't download
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@BUSTER123 Please post in the forum
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hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
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@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html

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