On 29/07/2017 16:19, Adrian wrote:
> In message , Martin Gregorie
>  writes
>> 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.
>>
>>
>
> Thanks, the old power supply is marked as 2000mA, so I'd be looking for
> one at least that size as a replacement.
>
> Adrian

Get a proper Raspberry Pi PSU. 2500mA:
https://www.amazon.co.uk/Official-Power-Adapter-Raspberry-Pi/dp/B01CO1HZJ6/ref=
sr_1_7?s=computers&ie=UTF8&qid=1501343771&sr=1-7&keywords=raspberry+pi+3+power+
supply

Or similar, no recommendation/not tried it/3000mA:
https://www.amazon.co.uk/dp/B01N9QZKD6/ref=sr_1_5?s=computers&ie=UTF8&qid=15013
43856&sr=1-5&keywords=raspberry+pi+3+power+supply


--

Chris Elvidge, England

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