interfacing ir sensor with 8051

[kunal kalra]

 

hi

 

can anyone please help in interfacing IR sensor with 8051. the ir sensor i want to use is in this link http://www.pages.drexel.edu/~pyc23/ir_sensor.html 

 

i want to make one pin of 8051 high or low if any object comes between IR TX. and IR RX.

 

please help me out with this

[dagakshay]

the IR interfacing shown below gives the analog o/p and so for that there can be two ways to IR sensor with interface 8051

 

 

wysiwyg_imageupload:258:

 either this analog o/p can be given to ADC and then it is interfaced with 8051. this par is expalined on site. go for the link

http://www.engineersgarage.com/microcontroller/8051projects/distance-measure-IR-ADC0804-AT89C51

  or to convert its analog o/p to ttl logic use opamp ion compartor mode….

 

see the comparator ckt below… and for your application it will be more easier, less complex and cost effictive

…………………………..

wysiwyg_imageupload:259:

[kunal kalra]

 thnx for this much information……

 

can u tell me any ir sensor which gives digital output

[dagakshay]

a good quatily of IR can give TTL o/p but again at the end the o/p is feed to buffer(say uln2003) to sharp your o/p.. let me expalin this

 

when ir falls on Rx its conductivity changes, which in turn changes the resistance and we measure the change in voltage. the change in resistance depends on two thing first the amount of IR and second the quality of Rx.

it you have a good quality of IR pair its Tx and Rx efficiency will be higher so it will be able to give TTL o/p but at the end we can be reliable on it. reliable i mean to say it might change voltage from 0-2.5V but micro controller can’t understand 2.5V so we use a buffer at the end.

 

see the CKT below:-

i tested it and it works, but again you must have a very good quality of IR pair.

the o/p quality also depends on surrounding environment.  

wysiwyg_imageupload:260:

[kunal kalra]

 hello dear….

 

i have to interface total 6 ir tx and rx pairs with 8051(port 3) can u help me with circuit how can i interface it with 8051. all my circuit is complete expect sensor card. i want to make the bit high or low when smone comes betweenw the ir tx and rx.

 

please help me…looking for positive response

 

 

and the ir tx and rx pair i am using is on this link microcontrollerkits.com/

[dagakshay]

i din’t get you want circuit for interfacing of sensor pair with microcontroller or circuit of IR sensor to to get TTL o/p….

 

 

for ir sensor i had given you above.. i had shown it for one ir pair…..

and for microcontroller interfacing… connect the TTL  o/p to one the port(in your case port3)…

 

reffer to this link

http://www.engineersgarage.com/electronic-circuit/infrared-ir-sensor

[kunal kalra]

let me give u one example if someone comes between the ir tx and rx then the output of sensor must make the one pin of 8051 high. help me and tell me how i can connect the complete circuit with 8051 and sensor.  
 

 

as ir sensor gives analog output how can i convert that to digital so that i cane make the one pin of 8051 high.

[dagakshay]

My dear kunal kalra………

the TTL o/p itself is a digital o/p you can feed it directly to controller

 

now practically implement it

 

wysiwyg_imageupload:295:

[sunny]

 go to the link http://www.lirc.org/receivers.html  and also

http://www.google.co.in/imgres?imgurl=https://engineering.purdue.edu/ece477/Webs/F09-Grp07/nb/Shaun/IR%2520Sensor.jpg&imgrefurl=https://engineering.purdue.edu/ece477/Webs/F09-Grp07/nb/spgreene.html&usg=__MGAMCgkXlxFV6O73ub9Zl5iV2zM=&h=1607&w=2164&sz=128&hl=en&start=20&sig2=_8CKy7t4UHKkQZeW4tYRdQ&zoom=1&tbnid=_yvSTnprxwCRDM:&tbnh=167&tbnw=223&ei=WH8ATeHxFobwvwPL5Z3OBg&prev=/images%3Fq%3Dpulsed%2Bir%2Bsensor%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DX%26gbv%3D2%26biw%3D1024%26bih%3D677%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=551&vpy=261&dur=2786&hovh=193&hovw=261&tx=133&ty=61&oei=Fn8ATb_PMoXzrQeUqaiTDw&esq=2&page=2&ndsp=12&ved=1t:429,r:6,s:20

[kunal kalra]

hey can u tell me in IR RX part out of anode or cathode which is connected to +5 volt….as in image u use the mirror image so its not clear to me

[dagakshay]

wysiwyg_imageupload:498:IR rx part (photo diode) is always connected in reverse bias

[Sitank Bhatia]

Hey Kunal hi Sitank this side…Well mate need some help from you…was searching for my project and came across this forum…you’ve had some discussion over here…am also working on a similar project so could you please let me know your circuit please…

Thanks for your time…

 

[puneet jain]

help!!!

 

i want to make a anticollision prototype for a car….i want to add ir sensor so that. car stop when ever a obstacle comes in between ir tx and rx….plz help me..i have to use 8051 microcontroller for this

 

1. i have assembled dc motor’s but how to assemble ir reciever and its code i have to idea please help me in this regard…

 

i want to mount ir on car front and as soon as it tracks any obstacle between them..it stop…

 

[srinu]

hi

may b it helpful for u……………….

 

ir DIGITAL OUTPUT CKT…..

 

njoy ur circuit….

wysiwyg_imageupload:3277:

[Dexter]

this circuit may help u  peoplewysiwyg_imageupload:3285:

[Author]

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