urgent need!!!!!

[engkhlaif]

i need help in writing a code that configure an GP2D12 sensor this sensor reads analog signal and then it must convert it into digital using the
PIC16F877A A/D pins
i need a help as i want to interface this sensor with the mentioned microcontoller
any one can help????
thanx

 

[futz]

http://www.acroname.com/robotics/info/articles/sharp/sharp.html
http://www.acroname.com/robotics/info/articles/irlinear/irlinear.html
https://www.electro-tech-online.com/threads/connect-gp2d12-infrared-sensor-with-pic-16f877a.23109/
**broken link removed**
Near the bottom of this PDF:
**broken link removed**

 

[engkhlaif]

thanx futz
the idea is that iam using MPLAB and every code i found is written in PIC C compiler
please if any has a code or can help me in a code that support MPLAB

 

[futz]

thanx futz
the idea is that iam using MPLAB and every code i found is written in PIC C compiler
please if any has a code or can help me in a code that support MPLAB

There's asm code in those links. Anyway it's not too hard to do AD conversion with PICs. Just refer to the datasheet and get coding.

 

[Nigel Goodwin]

There's asm code in those links. Anyway it's not too hard to do AD conversion with PICs. Just refer to the datasheet and get coding.

Or check my tutorials, which explain it more clearly than the datasheet.

 

[Hank Fletcher]

need help in writing a code that configure an GP2D12 sensor this sensor reads analog signal and then it must convert it into digital using the
PIC16F877A A/D pins
i need a help as i want to interface this sensor with the mentioned microcontoller

It's really not that big of a deal. Just use the same ground and supply for the GP2D12 as you're using for your PIC (presuming 5V regulated). Connect the third pin of the GP2D12 to the PIC A/D pin of your choice. Set the pin A/D input, read the incoming variables, and write code to suit your application as needed.

Check the datasheet (especially the volts vs. distance graph) for the GP2D12 though while you're experimenting with it. Note that while you're really close to the GP2D12, or when you start to move to the farthest of its range, the readings become erratic and unusable. That's okay, just plan your physical design (e.g. robot wall detection) to work within those limits.

You may also find for detection of a stationary object, the GP2D12 output will fluctuate slightly. That's okay, but the preferred way to compensate seems to be to take an average of several (maybe ten or so) readings, as oppose to using a capacitor to smooth the output.

FYI tip: I had to use one of the Sharp sensors to detect distance changes in an unique situation, where the placement of the sensor required quite a length of wire between it and the mcu it was sending its output signal to. Initially I used a length of telephone cable, but the interference was far too great (resulting in considerable fluctuations in sensor readings). The solution was instead to use a length of USB cable, with the connectors cut off from each end. The extra shielding in the USB cable adequately eliminate the interference, even over a 10' length. Just something to think about if ever you're unable to locate the sensor less than a foot away from your mcu in your design.

 

[engkhlaif]

It's really not that big of a deal. Just use the same ground and supply for the GP2D12 as you're using for your PIC (presuming 5V regulated). Connect the third pin of the GP2D12 to the PIC A/D pin of your choice. Set the pin A/D input, read the incoming variables, and write code to suit your application as needed.

Check the datasheet (especially the volts vs. distance graph) for the GP2D12 though while you're experimenting with it. Note that while you're really close to the GP2D12, or when you start to move to the farthest of its range, the readings become erratic and unusable. That's okay, just plan your physical design (e.g. robot wall detection) to work within those limits.

You may also find for detection of a stationary object, the GP2D12 output will fluctuate slightly. That's okay, but the preferred way to compensate seems to be to take an average of several (maybe ten or so) readings, as oppose to using a capacitor to smooth the output.

[ [/B]

dear i have read the data sheet of GP2D12 and if wrote a linear equation that describe the distance of the moving object
the idea is how can i display this distance of an LCD not as a string i want to display it as the value is changed continuously
CAN YOU HELP ME WITH A PEICE OF CODE THAT READ THE VALUE FROM THE A/D PIN AND THEN CONVERT IT INTO DISTANCE AND DISPLAY IT ON
LCD 1*16
THANX FOR ATTENTION OF MY NEED

 

[Hank Fletcher]

dear i have read the data sheet of GP2D12 and if wrote a linear equation that describe the distance of the moving object

If you see the graph on the datasheet, you'll note the relationship between voltage output of the sensor and distance is NOT linear.

I recommend you separate your inquiries into smaller tasks, and study or repost them individually:
- interfacing to LCD (with specific details about what you're using);
- interfacing to the sensor via an A/D pin. I'm not overly familiar with assembly language to be able to do that myself, but I know there are several people on this forum who'd find that easy as anything. You might mention whether or not you're using/looking for assembly code, or if not, what other compiler you're using;
- processing the data from the pin into the LCD usng a program that will satisfy your requirements (again, specific details about your project wouldn't hurt).

Pressuring people by typing in all-caps or being overly insistent that they ought to feel obligated to help you as a top priority will not necessarily endear you to those who might most be able to help you. Yeah, you might have a deadline, but a free forum you can't expect to get much more than what you pay for. Be patient with those helping you, and you might find that patience is returned in kind. If finding a solution was that imperative to you, you would have posted your question a week, or month, or year ago.

 

[engkhlaif]

If you see the graph on the datasheet, you'll note the relationship between voltage output of the sensor and distance is NOT linear.

I recommend you separate your inquiries into smaller tasks, and study or repost them individually:
- interfacing to LCD (with specific details about what you're using);
- interfacing to the sensor via an A/D pin. I'm not overly familiar with assembly language to be able to do that myself, but I know there are several people on this forum who'd find that easy as anything. You meant mention whether or not you're using/looking for assembly code, or if not, what other compiler you're using;
- processing the data from the pin into the LCD usng a program that will satisfy your requirements (again, specific details about your project wouldn't hurt).
thanx for your attention dear
first
the idea is to use GP2D12 analog sensor this sensor will detect the distance of the moving object and then through the input ouput pin of sensor i interfaced it with pin PORTA pin A0 of PIC16f877A which will convert the nalog reading into digital one and then calculate the distance and display it on the LCD
here the LCD i use is of type 1*16 VK2038STLDYGBN-ELN which will display the calculated distance on the LCD
the compiler i use is MPLAB or PIC C compiler with c code not assembly
to summarize the idea is to developea c code that configure and GP2D12 SENSOR with LCD to calculate the distance and then display it on LCD
any one can help i need it as soon as any one can