Please help me to develop logic for optical door sensor.....

[ec_nisarg]

I need help for curtain door sensors (used in elevator door)

i want to develop some sort of scanning technique for sensors.

I have 32 ir emmiters in one line and 32 photo detectors on opposite side.

 

[ahmad1954]

please tell me if i'm wrong. you want door don't close if all 32 sensor are not off.

 

[jpsganesh]

controller based? if so which controller & compiler?
or u wanted to use only digital logic combination?

 

[ec_nisarg]

actually i have completed full hardware and here are spacs...

controller : pic16 (8bit)
compiler : mplabx

tx has
32 ir leds
rx has 32 photo diodes (ir wavelength matched)

i do not want code, i want logic, i will code on my own.

i want that if any one put hand between sensors, it should give me output (relay toggle)

i have completed one to one transmition, now i want to devlop ogic for cris cross beams,

can any body help me??

 

[jpsganesh]

When u put ur hand its giving logic "1" or "0" ?
What kind or output it is? means what type of driver u r using? transistor (open collector) or logic gate ICs like TTL, CMOS or op-amp?

Post ur ckt. So that we can suggest u right solution.

Option 1: put all the sensor series. This u can achieve by putting all the sensors seriously or u can achieve it by using logic gates. So any one of the sensor goes "0" o/p will be "0".
Option 2: connect all sensor o/p to uC I/P pins. Read all the input and check the status. If ur controller doesn't support for no of O/Is u can use port expander or some logic ICs.

 

[ec_nisarg]

sir, you din't understood my question,, i said that i have completed my hardware,,, all is done,,
only thing is to right the firmware for this sensor,,
i want to devlop logic...

ok, here are some fact....

32 sensors using four 8x1 mux,,, so i can select each sensor individually,

 

[jpsganesh]

i do not want code, i want logic, i will code on my own.

sorry, I miss understud of this point.

so for selecting ur 4 MUX u need 12 address lines 3 for each.
Address selection can be done in many ways. one of the other way is 3 address line and 4 chip select line. so totally u need 7 O/P only.

and 4 I/P lines.

first configure I/P and O/P lines. (TRIS register)

then first chip and first line (Address - 000)
read it's corresponding MUX O/P (controller I/P - 1)
store it's value in array or variable

next step is same chip but address - 001
read it's corresponding MUX O/P (controller I/P - 1)
store it's value in array or variable

like that up to 111

then second chip first line (address - 000)
read it's corresponding MUX O/P (controller I/P - 2)
store it's value in array or variable

and repeat the same for all chip address from 000 to 111


let me know if u find any difficulty.

 

[ec_nisarg]

sorry, I miss understud of this point.

so for selecting ur 4 MUX u need 12 address lines 3 for each.
Address selection can be done in many ways. one of the other way is 3 address line and 4 chip select line. so totally u need 7 O/P only.

and 4 I/P lines.

first configure I/P and O/P lines. (TRIS register)

then first chip and first line (Address - 000)
read it's corresponding MUX O/P (controller I/P - 1)
store it's value in array or variable

next step is same chip but address - 001
read it's corresponding MUX O/P (controller I/P - 1)
store it's value in array or variable

like that up to 111

then second chip first line (address - 000)
read it's corresponding MUX O/P (controller I/P - 2)
store it's value in array or variable

and repeat the same for all chip address from 000 to 111


let me know if u find any difficulty.

that is also done...

what my problem is.. by this method i can check one to one beam...
means if i make led3 on i scan it using receiver 3.. that is ok.. i have done this..

but my senior has aksed me to check cris cross beams (he wants me to make 156 detections using 32 pairs....)
so i am asking for that... what is the logic to check cris cross...

p.s. i am pro and i can make any micro play as i want... so just give me logic.. else i will do my self..

- - - Updated - - -

i would again like to emphasis my question...

how i can make 156 detections using 32 pairs of ir tranmitters and receivers???