[OpenTRV-interest] Power to OpenTRV boards

[Damon Hart-Davis]

On 10 Nov 2014, at 17:47, Alasdair Macdonald <EMAIL ADDRESS HIDDEN> wrote:

> Quick summary and some questions about the jumpers and power options.
> This is what I recall from our session the other evening:
> 
> 
> * To power from FTDI cable, use both jumpers

Correct.

> 
> * If ONLY the jumper that is closer to the middle of the board is ON
> (ie the one closer to the edge of the board is removed); then power
> can be supplied from the micro USB cable (whilst the FTDI cable
> remains connected, reading and writing data if necessary).

Yes.


> 
> Q1. In this case, is it OK to connect / disconnect the serial cable
> whilst the device remains powered? (ie for changing settings, or
> reading some data)
> 

Yes, but plugging in the FTDI cable should cause a restart.

> 
> * For battery power, remove BOTH jumpers.

Correct.

> 
> Q2. In this case, is it OK to connect / disconnect the serial cable
> whilst the device remains powered? (ie for changing settings, or
> reading some data)

Yes,  but not the point about reset.

> 
> 
> * Presumably jumpers should only be added / removed when there is NO
> power connected?

That would be wise.

Rgds

Damon