On Sat, 29 Jul 2017 14:20:01 +0100, Adrian wrote:

> One thought that occurred to me was that the new power supply (borrowed
> from my phone) might not have enough power output for anything more than
> the basic board.
>
> Any suggestions on where to look next ?
>
Total the power requirements of the DH22, Edimax and RPi. Compare with
stated output of the PSU. If close to, or exceeding the PSU capability,
get a bigger PSU.

Remember that an RPI can need 2100mA while booting though typically will
only uses 500mA while running. This was correct for the RPi B+ - the Pi 2
and 3 may/probably will have higher power requirements.

Find out whether the other devices have similar spikes and size the PSU
accordingly.

Note that the flat, square, black two-outlet USB PSUs sold by Maplins had
a TOTAL capacity of 1000mA: I'm certain that other PSUs have a similar
limitation.

Get the current requirement of each device by reading the spec or,
preferably, using a multimeter on each device. Yes, you may need to make
up one or more leads that you can connect the multimeter to. Make you use
the maximum  current drain for each device and assume that they can all
happen at the same time.


--
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

--- SoupGate-Win32 v1.05