Sharp GP2D02

[Alby]

I am trying to use the sharp sensor with a sumo robot and I cannot seem to read the information from it. I am programming in pic basic and It seems I need to read the 8 bit serial data from the sensor, store it and then read it to interpret it. For now I 'd be happy to show it on an lcd screen.
Can anyone point me to some more info on the serin commmand and how to figure this out
Thanks
Alby

[mister_e]

as a start http://www.mcselec.com/download/appnotes/gp2d02.pdf

based on BasicStamp... easy to translate now.

[Alby]

Thanks for the note Steve, Will check it out
Cheers
Alby

[sundaecone]

uhm.. if it's not too much.. could somebody please help me with the programming? i'm using assembly..

i'll be happy just to be able to output the measurement in PORTB.. i made a code but apparently, it doesn't work.. i already searched other forums and so far this is the only one with a hit..

thanks in advance..

[Martin....]

Hi

I translated the code.
The Sensor IR works but I can´t read the Result.
Has anybody ever tested this Code ?
I see the result by the blinking of a LED.
Even with the oscilloscope I got no Result.

Martin


Here is what I translated

@ DEVICE INTRC_OSC_NOCLKOUT, MCLR_OFF
DEFINE OSC 4

' Set receive register to receiver enabled
DEFINE HSER_RCSTA	90h

' Set transmit register to transmitter enabled
DEFINE HSER_TXSTA	20h

' Set baud rate
DEFINE HSER_BAUD	9600

' Set SPBRG directly (normally set by HSER_BAUD)
DEFINE HSER_SPBRG	25



  
Vo 		VAR     PORTB.6		' ---->sensor Input
Vin 	VAR     PORTB.7		' <----sensor Output
SERVO	VAR		PORTB.5		' Servo Motor
LED		VAR		PORTB.0		' LED control
i		VAR		BYTE		' loop variable
Dist	VAR		BYTE		' result of measurement		

' -----[ Initialization ]---------------------------------------------
'
init: 
TRISB  	= %10000001			' designate portb as output
PORTB  	= 0        			' clear portb 
Dist   	= 0
Input Vin
High LED
        
' -----[ Main Loop ]--------------------------------------------------
'
start:
GoSub sensor_control
GoSub LED_Distance
GoTo start
' -----[ Subroutines ]------------------------------------------------
'
sensor_control:
Dist = 0
Low Vo
Pause 72
For i = 0 TO 7
	PulsOut Vo,15
	Dist = Dist * 2 + Vin
	'HSerout [DEC Dist]
	Next i
High Vo
Pause 3
Low Vo
Return        
       
       
LED_Distance:

IF 			   (Dist > 147) Then PWM LED, 13,2 >10	    5%
IF (Dist < 147) AND (Dist > 119) Then PWM LED, 26,2	'10-15	10%
IF (Dist < 118) AND (Dist >  91) Then PWM LED, 38,2	'15-20	15%
IF (Dist <  90) AND (Dist >  81) Then PWM LED, 51,2	'20-25	20%
IF (Dist <  80) AND (Dist >  71) Then PWM LED, 64,2	'25-30	25%
IF (Dist <  70) AND (Dist >  65) Then PWM LED, 77,2	'30-35	30%
IF (Dist <  64) AND (Dist >  55) Then PWM LED, 89,2	'35-40	35%
IF (Dist <  54) AND (Dist >  50) Then PWM LED,102,2	'40-45	40%
IF (Dist <  49) AND (Dist >  47) Then PWM LED,115,2	'45-50	45%

IF (Dist <  46) AND (Dist >  44) Then PWM LED,140,2	'50-60	55%
IF (Dist <  43) AND (Dist >  42) Then PWM LED,166,2	'60-70	65%
IF (Dist <  41) AND (Dist >  40) Then PWM LED,191,2	'70-80	75%
IF (Dist <  40) 				 Then PWM LED,217,2	'>80	85%
Return

[DanPBP]

I know this thread is old, but I just wanted to reply with a working code:

sensor_value var byte

high sensor_clock
pause 3
low sensor_clock
pause 70
shiftin sensor_data,sensor_clock,2,[sensor_value\8]