Subject:
|
Re: IR output on HB
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Tue, 5 Aug 1997 18:38:40 GMT
|
Original-From:
|
Chuck McManis <CMCMANIS@FREEGATE.stopspamNET>
|
Reply-To:
|
cmcmanis@freegate!NoSpam!.net
|
Viewed:
|
1618 times
|
| |
|
|
Run them in parallel, use a transistor.
Like so:
+5v
|
+---+---+---+---+---+
| | | | | |
\ \ \ \ \ \
/ R / R / R / R / R / R
\ 1 \ 2 \ 3 \ 4 \ 5 \ 6
/ / / / / /
-- -- -- -- -- --
\/ \/ \/ \/ \/ \/
-- -- -- -- -- --
HB + | | | | | |
\ | | | | | |
/ 1K +----+----+---+---+---+---+
\ |
| |/
+---| 2N2222 NPN transistor
|\
|
Gnd
Depending on the current you want through the LEDs you should
pick R1 - R6 to be 270 - 470 ohms. To compute the current use
ohms law, taking into account that the voltage drop across the
2n2222 and the Led's will be about 1.5 volts. (ie 5 - 1.5 = 3.5v
so for 10mA a 330ohm resistor could be used).
Phethsavong Prachith wrote:
>
> Hi, I'm trying to get the ir output on the handy board to power more
> than 4 LEDs (need to power 6), anything beyond that the ir signals
> become drastically weak. I have these LEDs wired serially. I'm not too
> familiar with electronics, so is it possible to amplify the signals the
> ir output generates?. If so how?
>
> + - + -
> Grnd <---|-----O------LED-----LED----
> | - + - + - + |
> <---|------LED----LED-----LED--
>
> O is a 10k pot
> 3-4 LEDs work great but anymore just kills the signals.
>
> thanks,
> phet
|
|
Message has 1 Reply:
 | | Re: IR output on HB
|
| No, don't use a transistor! The HB's IR out already has one. But the parallel-with-a-sepa...r-for-each method is correct. -Fred In your message you said: (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
Message is in Reply To:
| | IR output on HB
|
| Hi, I'm trying to get the ir output on the handy board to power more than 4 LEDs (need to power 6), anything beyond that the ir signals become drastically weak. I have these LEDs wired serially. I'm not too familiar with electronics, so is it (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
3 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
