Author Topic: $50 Robot Electronics- Status LED  (Read 2683 times)

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Offline legobotTopic starter

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$50 Robot Electronics- Status LED
« on: February 12, 2010, 11:05:35 PM »
I'm building the $50 Robot, and I'm at the stage where you test the electronics.  I have connected power to it, but the status LED isn't lighting up.  I have checked the dot schematic, and it says that the resistor the LED is connected to should connect to Pin 6 on the Atmega IC.  The instructions say to connect it to one of the digital outputs, though.  I'm getting really confused!

What should be connected where?  What should happen when I turn on the power?

If anyone could please answer these questions, I would appreciate it very much.


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Offline Trumpkin

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Re: $50 Robot Electronics- Status LED
« Reply #1 on: February 12, 2010, 11:11:28 PM »
The status LED will not light up until you program the microcontroller.
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Offline legobotTopic starter

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Re: $50 Robot Electronics- Status LED
« Reply #2 on: February 19, 2010, 03:02:31 PM »
Thanks Trumpkin!

So why is the LED connected to a digital output port?  Won't the LED only light up if there is power going to that port?


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Offline SmAsH

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Re: $50 Robot Electronics- Status LED
« Reply #3 on: February 19, 2010, 03:16:58 PM »
No, the led lights up when the port goes low, thus letting power from vcc through the led, though the pin to gnd.
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Offline legobotTopic starter

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Re: $50 Robot Electronics- Status LED
« Reply #4 on: February 19, 2010, 07:53:16 PM »
Quote from: SmAsH on February 19, 2010, 03:16:58 PM
No, the led lights up when the port goes low, thus letting power from vcc through the led, though the pin to gnd.

Ah ha!

Thanks!  That makes sense.


legobot
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