CHI035 + SRF005 not working

[robert.higginson]

Hi,
I am playing with some SRF005 modules and don't seem to be getting anywhere.

I have connected the +5, 0v to the +v and 0v on the input side of the CHI035 board (with 18M2) fitted. I have connected the middle pin of the SRF005 to input 0 (C.0) of the CHI035 board. Hopefully the idea is to use a single pin I/O connection.

I have tried to use the flowchart loop given in the manual ie. Ultra 0,A > Debug > Wait 0.5 (repeated)

The circuit mounted LED on the SRF005 flashes every second but the Debug screen only shows zeros. I have been reading the other entries in the forum and have replaced the Ultra with an Inc. The Debug value does change!

I have tried this on two SRF005 modules and both do the same thing (not surprisingly!). I have looked around and can't see an idiots guide to this problem so thought that there would be someone out there who would know how to solve my problem.

[Bill.b]

Hi Robert

try this code. change c.4 to suit the input pin you are uning. the result shold be in w1

For more help, a schematic and code would help to solve you problem.

Symbol trig 	   = C.4			'SRF005 range sensor ADC input	
Symbol range            = w1
main:
	pulsout trig,2        		              ' produces about 20uS pulse (must be minimum of 10uS)
   	 pulsin trig,1,range  		' measures the range in 10uS steps
    	pause 10               		' SRF005 mandatory 10mS recharge period after ranging completes
    	let range = range * 10 /29 	              ' multiply by 10 then divide by 58 for 4meg or 28 for 8meg 
	debug
               pause 100
	goto main

Bill

[robert.higginson]

Thanks for the idea. The code is the same as I tried earlier. Same effect - flashing led but no change to the values within the debug window.
I know that this is not quite what you asked for but hopefully it might give you a clue to what I have done.

I used your code and changed the trig to trig=C.0

chi035.png

[Bill.b]

connections from data sheet

srf0005.jpg

Bill

[Technical]

As Bill says you need two 0V connections, pins 4 and 5 (not just 5)

[robert.higginson]

Oops! I read the sheet wrong and thought that there was no connection on two of the pins. I have bridge the pins and now they are perfectly working as expected.
Thanks.