Electronic Brick - Light Sensor

Grove is a modulated, ready-to-use tool set.
Much like Lego, it takes a building block approach to assembling electronics.

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ezflyr
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Electronic Brick - Light Sensor

Post by ezflyr » Fri Feb 25, 2011 10:45 pm

Hi All,

Has anyone got the datasheet on this module? I just received two of these from Seeed, but could find the datasheet on the website. When I contacted Tech. Support they told me "it's an old product, and the designer has left the company - no information available" :shock: !!

Thanks,

John

jpd
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Re: Electronic Brick - Light Sensor

Post by jpd » Fri Feb 25, 2011 11:37 pm

Looking at the picture here, it looks like it's just a light dependent resistor and an LM358 op-amp, same as the Twig version that replaced it. I suspect operation would be very similar for both.

There is also some information in the Electronic Bricks Cookbook

refugee
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Which products/projects are your favorite?: Electronic brick - light sensor (Analog)

Re: Electronic Brick - Light Sensor

Post by refugee » Fri Feb 10, 2012 9:38 pm

Hi guys,

I'm sorry, I know that this is a rather old topic, but I didn't want to start a new one with basically the same title.

The only thing I'd simply like to know is what the max. output voltage is, in regards to the detected luminosity level. At a normal indoor light condition I measure approx. 2.2 V, and the sensor is perfectly responding when it is supposed to show lower values. But what about the max. value? The reason I need this reference for is that I need to assign the full analogue voltage range to its digital output.

Anyone who could help me out on this one?

Thanks,
David

refugee
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Which products/projects are your favorite?: Electronic brick - light sensor (Analog)

Re: Electronic Brick - Light Sensor

Post by refugee » Fri Feb 10, 2012 10:22 pm

Edit:

I checked the Electronic Bricks Cookbook jpd referenced above (rather poor in general) and the code example is really frustrating. Since analogRead() returns an integer, why is it compared to a HEX (0x200) ?? And anyway, if it is HEX it would be 512 decimal; the 2.2 V I mentioned above are even less than that (around 400), given the 10-bit built-in ADC of the AVR chips on Arduinos. If it is meant to be 200 dec, then it is a rather low level to turn the lights on..! :P

Anybody, please??

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