1.5 in lcd tft screen

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sean_o_45
 
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1.5 in lcd tft screen

Post by sean_o_45 »

Please forgive my newbness, but I am trying to build an infrared night vision setup that I saw on instructables.com. IM using a cctv camera with a standard yellow video out cable and my question is if that will work with your 1.5inch tft screen. In the description it had mentioned something about possibly needing a raspberry pi? I was a bit confused since I have zero experience in this area.

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adafruit_support_rick
 
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Re: 1.5 in lcd tft screen

Post by adafruit_support_rick »

It will work with an NTSC video signal or an analog composite video signal. That's probably what you have, but your camera documentation should say for sure.

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

Excellent! Thank you for the prompt reply!

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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

I've run out of leads on another question that I'm hoping you may know. I purchased the 48 infrared led array model number fy -16048
But apparently, it is a replacement part for a camera that I don't have. I've looked all over the Internet and can't find the connector. The closest I can get is a 2 pin smd connector. The array is 12v and I have know idea at what amperage. I was hoping to send a pic and see if yall knew what kind of connector it is and where I could get one.

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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

<a href="http://s72.photobucket.com/user/sean_o_ ... 1.jpg.html" target="_blank"><img src="http://i72.photobucket.com/albums/i179/ ... 460671.jpg" border="0" alt=" photo 1397581460671.jpg"/></a>

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »


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adafruit_support_rick
 
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Re: 1.5 in lcd tft screen

Post by adafruit_support_rick »

Looks like a 2-pin JST connector:
https://www.adafruit.com/products/1131

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

You're awesome. I just ordered it and I'll find out. Last question: all of the components are 12 volt including the camera, well actually it's a range they give from 5v and up to 12v. So my question is, can I buy a 12v battery pack with 8 AA in it to add up to 12v? Another site was saying something about forward charge or something on the led's.

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Re: 1.5 in lcd tft screen

Post by adafruit_support_rick »

You can do the 8xAA thing. The camera should just run on it. For the LEDs, you need to be aware of the forward voltage, and you may need to add a current-limiting resistor in series with the LEDs to prevent the battery from blowing them out.
I can't help you much there, since I don't know the details of the LEDs, but you need to know the maximum current they can tolerate. There's a formula you can use to determine the amount of resistance you need, based on the amount of current you want to supply to the LEDs.

Most visible-light LEDs have a forward voltage of 2-3V, and you typically want to limit them to around 20mA of current.
The IR LEDs we sell have a forward voltage of about 1.6V, and you can run them continuously on 100mA.

The formula is
R = (<supply voltage> - (<forward voltage> * <LED count>)) / <amperage>

(<supply voltage> - (<forward voltage> * <LED count>)) can't go negative. The supply voltage must be higher than the sum of the forward voltages. So, you could run 7 LEDs with a Vf of 1.6V on 12V.

Assuming a constant current of 100mA (= 0.10A), the formula then works out to
R = (12 - (1.6 * 7)) / 0.10 = 8 Ohms

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

Well I have no idea what you just said, but I'm glad you said it. The connector just came in with the display and it was the perfect fit. I do have a question on the display though, I don't know exactly what power supply to connect it to. I know earlier a 12 volt power supply was mentioned. So am I to understand that I just buy a 8 AA, 12 v power supply pack and connect it to the monitor?

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

By the way, I can't tell you how appreciated your help has been. Without it, I quite simply would not be able to do it. Thank you.

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Re: 1.5 in lcd tft screen

Post by adafruit_support_rick »

You can use one of these:
https://www.adafruit.com/products/875

For the connector, you have a choice: You can cut the connector off of the battery pack and solder this JST connector onto the ends of the wires
https://www.adafruit.com/product/261

- OR -
You can attach the JST connector to one of these female barrel-jack adapters. The battery pack will plug right into it, and you won't have to do any cutting and soldering:
https://www.adafruit.com/products/368

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

Can I run all of the components in series since they're all 12v?

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adafruit_support_rick
 
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Re: 1.5 in lcd tft screen

Post by adafruit_support_rick »

Refresh my memory - you've got a camera, and LED array, and a screen, right?
You would power them in parallel, not in series.
Also, put an 8 Ohm resistor in series with the power to the LED array.

sean_o_45
 
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Re: 1.5 in lcd tft screen

Post by sean_o_45 »

K thanks.

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