Raspberry Pi Power consumption

[KNVB]

I would like to build an alarm clock application with Raspberry Pi .
Because of physical location limitation, I can get power from a broad band router (TP Link C7) USB 2.0 port only.
Is it possible to drive Raspberry Pi by a broad band router USB 2.0 port?

My application just play a MP3 hourly, but not include from 9pm to 9am.
However, I want the system clock can sync. with NTP server.

[rpdom]

A Pi Zero with a micro-USB network adaptor should be capable of being powered from a standard USB port. Otherwise I'd go for a Pi 1 B+ with built-in network port. With no additional peripherals the power draw should be under the 500mA that a normal USB port can provide.

[HawaiianPi]

A Pi Zero with a micro-USB network adaptor should be capable of being powered from a standard USB port. Otherwise I'd go for a Pi 1 B+ with built-in network port. With no additional peripherals the power draw should be under the 500mA that a normal USB port can provide.

Believe it or not, Ethernet is actually pretty power hungry. The most power efficient would be a Pi-Zero with a USB WiFi adapter. Mine draws less than 200mA when connected to my wireless router with this $4 adapter.

[KNVB]

Well, would you tell me how Raspberry Pi Zero output audio?
I cannot find Raspberry Pi Zero have any audio output port.

[rpdom]

Well, would you tell me how Raspberry Pi Zero output audio?
I cannot find Raspberry Pi Zero have any audio output port.

You should start another post as this question is not directly related to your original one about power consumption.

However, you are correct that the Zero does not have an analogue audio output. It does support digital audio output on the mini-HDMI connector, but you would need an adaptor or decoder to drive normal speakers.

It is possible to build a small circuit to connect to the GPIO pins on the Zero that will provide an analogue audio output. It is essentially the same circuit as used on most other versions of the Pi, except it uses different GPIO pins to provide the same function.

[HawaiianPi]

Well, would you tell me how Raspberry Pi Zero output audio?
I cannot find Raspberry Pi Zero have any audio output port.

Ah, good point. You only get digital audio from the HDMI port on the Zero, unless you add an additional audio device.

Perhaps a model A+ would be a better option, although it has a slower processor and half the RAM for roughly 5 times the price. But then again, you could get a Pi-Zero and pHAT DAC for less than an A+. But... the A+ has on-board audio out and a pre-installed header... oh, and a normal sized USB port.

AGHH!! I don't know which is the better choice, but if it was me, I'd go for the Zero and pHAT DAC. A bit more trouble because you'll have to add the header yourself, but at least the audio quality will be better.

[rpdom]

Well, would you tell me how Raspberry Pi Zero output audio?
I cannot find Raspberry Pi Zero have any audio output port.

Ah, good point. You only get digital audio from the HDMI port on the Zero, unless you add an additional audio device.

Perhaps a model A+ would be a better option, although it has a slower processor and half the RAM for roughly 5 times the price.

The A+ uses the same processor as the Zero and they can both be clocked to the same speeds.

An updated version of the A+ with the same 512MB RAM as the Zero is due out very shortly.

[HawaiianPi]

The A+ uses the same processor as the Zero and they can both be clocked to the same speeds.

An updated version of the A+ with the same 512MB RAM as the Zero is due out very shortly.

Ah yes, that's the other problem with the A+, it's even harder to find than the Zero! Hopefully that is because the new model is eminent. At least the ferocious demand for the Zero seems to have waned a bit. They're not selling out in minutes any longer. Hopefully the 1-per-order cap will be lifted soon.

[bensimmo]

Yes the A+ happily runs a 1GHz via the raspi-config setting.

Not found half the ram to be a problem yet, but then I don't no how I would no it's a problem either

Desktop computer I would but not these things.