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touch screen based wheel chair using 89c52

Ian Rogers

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#4
You need two ADC channels one to read the X and Z values and one to read the Y values... You also need to switch in a positive to each plate... The ADC has eight channels but no way of swapping the positive supply.... Go to MikroElectronica and look at this book... The last example has a simple switching circuit.. http://www.mikroe.com/chapters/view/17/chapter-4-examples/
 

Ian Rogers

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#6
I drew up a circuit using a 4053... with a single ADC connected to a 8052 micro..

When A,B & C on the 4053 are low... You will be reading the X axis... When all three are high you will read the Y axis.

Unfortunately, you won't be able to read the z axis, as I cannot swap a Ground for a positive... It could be done if you supply a positive to the X axis whilst the 4053 is switched away from the ground...
 

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Ian Rogers

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#8
I would imagine that A is the wiper.... All you need to do is check it with a multimeter.. Its a 50k trimmer so from B ~ C that will be the resistance... A will vary from one to the other!!
 
Thread starter #11
Dear how can i make my own ROM burner kit hardware for AT89s52.I wanna burn code using keil software.please tell me the ckt diagram for ROM burner kit
 

Ian Rogers

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#13
Honestly... The easiest way is to use P89c52RD2 from phillips... You can use the internal bootloader..

The at89s52 can be programmed serially with a home brew circuit.. One of which looks like this. http://ece.jagansindia.in/2012/01/isp-programming-kit-for-at89s952-and-avr-seires/

I have found that its best to use the circuit that the burner software recommends.. So if you look on Keil's web site you should find such schematic..
 

Tony Stewart

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Tony Stewart

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#18
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Ian Rogers

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#19

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