From: David C Brown <dcb.home@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Mon, 6 Apr 2020 23:17:15 -0700
Subject: Re: [EE]: Bi-Colour status LED
Thread-Topic: [EE]: Bi-Colour status LED
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Or, without the capacitor you could have shades of yellow.
__________________________________________
David C Brown
43 Bings Road
Whaley Bridge
High Peak                           Phone: 01663 733236
Derbyshire                eMail: dcb.home@gmail.com
SK23 7ND          web: www.bings-knowle.co.uk/dcb
<http://www.jb.man.ac.uk/~dcb>



*Sent from my etch-a-sketch*


On Tue, 7 Apr 2020 at 04:41, Brent Brown <brent@eds.co.nz> wrote:

> Interest only, I must have too much time on my hands...
>
> Todays brain exercise was how to add a red/green status indicator to an
> existing
> product. There is an available RS232 port, and firmware mods are feasible=
..
> The
> LED is required to be off when the power is off, green when functioning
> correctly,
> and flashing red when there is a fault.
>
> Attached circuit is I think about as simple as it can be. The LED is on
> solid Red
> when the power is on but no data is being transmitted, i.e. during bootup=
,
> due to the
> idle state of TxD being -ve. Could flip the LED and make the default Gree=
n
> if that
> were desired. LED can be set to red/green/off simply by changing the data
> being
> sent. Flashing shouldn't be too difficult. For extra marks dimming is
> possible.
>
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