Post by thread:[SX] Light Sensor LS100

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Heya Can anyone tell me how to hook this up to an SX? There is a diagram on the pdf but where do I hook up the IO Pin?

http://www.rapidonline.com/netalogue/specs/58-0120.pdf Help appreciated DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:In the PDF Fig 2 connect the point labeled "Vs" to an I/O pin configured for input. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Thanks Bean I cannot se a Vs in fig 2 do you mean Vo?

DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m202962 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:If you look in figure 2 you'll see that the sensor is connected in series with a 5K resistor and the voltage at the top of the resistor is what gets monitored. According to the docs you should see 2.5 volts at the junction, so make sure the I/O pin is set to TTL level (default).

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Thank you, im really not that stupid, im just struggling to get back into things (honest) :) DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m203023 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

hmm, vdd on the protoboard is 6.3V while between the resistor and the light sensor I get 5.7V nowhere near 2.5v as expected. Im using a 5.8K resistor (All I had around) I basically have VSS -> resistor -> Light Sensor -> VDD and between the resistor and light sensor is where I have the i/o pin on the SX, and this is also where the voltage is 5.7V Between the resistor and ground i get 0.1V HMM ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m203039 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:[QUOTE="djh82uk"] vdd on the protoboard is 6.3V.[/QUOTE] Are you sure you are not connected to Vin instead of Vdd? Vdd should be very close to 5.0V.

- Sparks ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m203052 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:hmm, Vin is at 9.6V and CDD in deffo 6V something My Wall Wart is set to 6V but is giving out 9.7V bit strange, the SX key is also getting rather hot when left on, is that normal?

Voltage reg is cold though DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m203147 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:any ideas? Just cannot get this to work, and yet it should be simple. If not how could I use a standard LDR?

Thanks for all your help DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m203676 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:anyone? What would you reccomend? an ldr or the light sensor?

i still don't know why the voltages seem way off :( DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m205225 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:I recommend that you get your voltage situation understood. Let's stop guessing and do some troubleshooting. Why these wild voltages? Does your voltmeter need a new battery? How accurately does it measure a separate battery (new, AA = 1.5V)? When powered with +5 and GND (Vss), but otherwise disconnected from the SX, what's the LS100 output like? Is it get dark enough to turn off and get light enough to turn on (looks like HI w/light, LO w/dark)?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:ok I tried 2 handheld multimeters plus a mains powered ex-military multimeter (huge waterproof thing for submarines, very nice :) )the voltage was the same on all 3 give or take 0.1V i don't like this wall wart giving out funny voltages so I will try it on my bench psu which I know to be accurate. I will also double and triple check the resistor, it is meant to be 5.8K but I wish I had an LCR. Also pin 2 the short leg I presume is also the side with flat bit (Like an led), correct?

I will check all this and get back to you thanks for the pointers, i think i just needed a little push ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m205245 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:Pin 2, the cathode, is by the flat on the circumference. This unit gets "reverse biased." 5.8K (red-grey-red) should be OK (if it's 58K, that's too much.) What're you using here, an SX28 ProtoBoard, a breadboard?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

hmm im getting green - blue - black on the resistor im using an SX48 Protoboard DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m205338 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:I wrote red-grey-red. Whoops. That should be green-grey-red (5, 8, and two 0s). Green-blue-black is 56ohms (5, 6, and zero 0s.) Not enough resistance.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

ha ha, stupid multimeter (user), i'll have a little look later, i really need and lcr, im useless with resistors Thanks DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m205374 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Henrymou wrote:

IM back ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m207268 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:been a while, but still not tried to sort this out, it's still sitting untouched, multimeter is fine, reads pretty much the same as what my variable psu says it is putting out. the resistor I have connected is green - Blue - Red - Gold Which i take to mean 5.6K 10% Correct?

The Wall Wart has been playing around, so I have a new one now DJh ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m214096 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:ok Wallwart seems to have fixed one of the voltage probs, now getting 4.8V @ VDD and 12V at Vin I get 4.8V going into the sensor, 4.32V coming out, and 0v at the resistor, it's as if the resistor is too strong.

wierd thing is, If i put the probes on both of the sensors legs, I get 0.63V but at reversed polarity compared to when I check the leg against ground hmm DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m214105 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:umm, ok The resistor was connected between then vss and the cathode of the sensor (flat edge, short pin), and nothing worked, turned the sensore around so it was wired up wrong, and the damn thing works.

Im totally confused now DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=202948#m214345 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)