SRF04 + Bargraph - Electronic Circuits Projects Diagrams Free

Azaruk · 23rd March 2007, 01:15 PM

First - I am very, very new to PICs and don't feel confident to develop this project all on my own. Hence this request to you amazingly clever and innovative people!

I work in the heavy transport industry. Reversing a 13 metre trailer up to a loading dock is more often than not done by touch! Trailers and loading deck get damaged.

I want to develop a simple parking sonar device, using a pair of transducer modules (one on each side of the trailer rear to take care of non-parallel approach) and a bargraph showing the distance from each module to the loading dock.

I thought of using a pair of SRF04 modules, a PIC and two bargraph displays.

Once I had come up with the concept, I realised I haven't the faintest idea of how to implement the idea.

Can anyone help?
Thanks

DeeJay · 23rd March 2007, 01:48 PM

Details of a similar product, using different transducers and discrete logic in place of a microcontroller and audio feedback in place of a bargraph, can be seen here - including a circuit diagram.

http://www.velleman.be/be/en/product/view/?id=9147

gramo · 23rd March 2007, 02:03 PM

I'd recommend downloading Proton Lite, and having a read through the help file and Protons Forums, this would be a very easy program to create with PIC Basic.

http://www.picbasic.org/proton_lite.php

This device would also be very easy to interface with, and it offers quite a lot of features;

* 0 - 255 inches range with 1 inch resolution
* 42kHz Ultrasonic sensor
* New LV version operates from 2.5-5.5V
* Low 2mA supply current
* 20Hz reading rate
* RS232 Serial Output - 9600bps
* Analog Output - 10mV/inch
* PWM Output - 147uS/inch
* Small, light weight module

To read how far away the object is would be as simple as;

Video: http://www.box.net/shared/q6mhhh4bu8

Code:

Device = 16F877
XTAL = 4
 
Dim Distance as Float

DECLARE ADIN_RES 10 		' 10-bit result required 
DECLARE ADIN_TAD FRC 		' RC OSC chosen 
DECLARE ADIN_STIME 50 		' Allow 50us sample time

LCD_DTPIN = PORTB.4
LCD_RSPIN = PORTB.2
LCD_ENPIN = PORTB.3
LCD_INTERFACE = 4
LCD_LINES = 2
LCD_TYPE = 0

ADCON1 = %10000000 			' Set analogue input, Vref is Vdd
Input PORTA.0
Input PORTA.1

DelaymS 100
Cls

Main:

        Distance = ADIN 0                           ' Grab the digital value of PORTA.0
        
        Distance = Distance * 5 / 1023          ' Convert to volts
        
        Distance = Distance / 0.010               ' Find out how many 10mV go into it
        
        Print At 1, 1, "D1 = ", Dec1 Distance, 34, "  "
		
        Distance = ADIN 1                            ' Grab the digital value of PORTA.1
        
        Distance = Distance * 5 / 1023             ' Convert to volts
        
        Distance = Distance / 0.010                 ' Find out how many 10mV go into it
				
        Print At 2, 1, "D2 = ", Dec1 Distance, 34, "  "
        
        Goto Main

For more information on any command, simply have a look at the Proton help file for that command

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
PIXAXE-18 and the SRF04	fishyghost	Robotics Chat	10	20th June 2006 02:28 PM
LED Bargraph thermometer opinion...	William At MyBlueRoom	General Electronics Chat	2	24th May 2006 11:02 PM
Purchasing SRF04 in Canada	micro571	General Electronics Chat	2	3rd April 2006 06:49 AM
srf04 ultrasonic sensors	cjgalway1000	Robotics Chat	2	5th March 2004 05:55 PM
Bargraph oil pressure reader using LM3914	ekooke	Electronic Projects Design/Ideas/Reviews	1	22nd December 2003 10:59 AM

23rd March 2007, 01:15 PM	(permalink)
Azaruk	SRF04 + Bargraph First - I am very, very new to PICs and don't feel confident to develop this project all on my own. Hence this request to you amazingly clever and innovative people! I work in the heavy transport industry. Reversing a 13 metre trailer up to a loading dock is more often than not done by touch! Trailers and loading deck get damaged. I want to develop a simple parking sonar device, using a pair of transducer modules (one on each side of the trailer rear to take care of non-parallel approach) and a bargraph showing the distance from each module to the loading dock. I thought of using a pair of SRF04 modules, a PIC and two bargraph displays. Once I had come up with the concept, I realised I haven't the faintest idea of how to implement the idea. Can anyone help? Thanks

23rd March 2007, 01:48 PM	(permalink)
DeeJay	Details of a similar product, using different transducers and discrete logic in place of a microcontroller and audio feedback in place of a bargraph, can be seen here - including a circuit diagram. http://www.velleman.be/be/en/product/view/?id=9147

23rd March 2007, 02:03 PM	(permalink)
gramo	I'd recommend downloading Proton Lite, and having a read through the help file and Protons Forums, this would be a very easy program to create with PIC Basic. http://www.picbasic.org/proton_lite.php This device would also be very easy to interface with, and it offers quite a lot of features; * 0 - 255 inches range with 1 inch resolution * 42kHz Ultrasonic sensor * New LV version operates from 2.5-5.5V * Low 2mA supply current * 20Hz reading rate * RS232 Serial Output - 9600bps * Analog Output - 10mV/inch * PWM Output - 147uS/inch * Small, light weight module To read how far away the object is would be as simple as; Video: http://www.box.net/shared/q6mhhh4bu8 Code: Device = 16F877 XTAL = 4 Dim Distance as Float DECLARE ADIN_RES 10 ' 10-bit result required DECLARE ADIN_TAD FRC ' RC OSC chosen DECLARE ADIN_STIME 50 ' Allow 50us sample time LCD_DTPIN = PORTB.4 LCD_RSPIN = PORTB.2 LCD_ENPIN = PORTB.3 LCD_INTERFACE = 4 LCD_LINES = 2 LCD_TYPE = 0 ADCON1 = %10000000 ' Set analogue input, Vref is Vdd Input PORTA.0 Input PORTA.1 DelaymS 100 Cls Main: Distance = ADIN 0 ' Grab the digital value of PORTA.0 Distance = Distance * 5 / 1023 ' Convert to volts Distance = Distance / 0.010 ' Find out how many 10mV go into it Print At 1, 1, "D1 = ", Dec1 Distance, 34, " " Distance = ADIN 1 ' Grab the digital value of PORTA.1 Distance = Distance * 5 / 1023 ' Convert to volts Distance = Distance / 0.010 ' Find out how many 10mV go into it Print At 2, 1, "D2 = ", Dec1 Distance, 34, " " Goto Main For more information on any command, simply have a look at the Proton help file for that command __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net