Powering the Pi

[DerDude878]

Hi Guys,
i've ordered the PCB's from Helder, but they haven't arrived yet. So i thought i could start to test the power supply for the pi. I wantet to be able to charge the battery and play at the same time, so i followed the description from Helder from here: viewtopic.php?f=33&t=3404&start=60#p36590

I've attached a diagram of my wiring.

But when i turn the switch, the pi won't boot and the green 'done' LED on the microLiPo is flashing. If i don't use the diodes and wire everything directly it works fine but with the diodes it won't. I used two "400V/1A UF4004" diodes.

What did i do wrong?

Thanks in advance,
Christian

[ICMF]

Are your diodes backwards?

[Psyicman]

I was asking how to wire up the diodes in the wireing diagram thread and Helder said that it can drop the voltage to the point of browning out or not powering the components. You probably need some really low resistance diodes to make this work. And thanks for posting a picture of how to wire these in.

[DerDude878]

Are your diodes backwards?

According to Helders post, they should face that way.

[DerDude878]

After rethinking and reading Helders post again, i came up with this. Will this work? Can someone verify?

[HoolyHoo]

Hi Guys,
i've ordered the PCB's from Helder, but they haven't arrived yet. So i thought i could start to test the power supply for the pi. I wantet to be able to charge the battery and play at the same time, so i followed the description from Helder from here: viewtopic.php?f=33&t=3404&start=60#p36590

I've attached a diagram of my wiring.

But when i turn the switch, the pi won't boot and the green 'done' LED on the microLiPo is flashing. If i don't use the diodes and wire everything directly it works fine but with the diodes it won't. I used two "400V/1A UF4004" diodes.

What did i do wrong?

Thanks in advance,
Christian

There is an approximately .7 volt voltage drop among common diodes. It is possible there is not enough voltage from your lipo battery to power the pi.

[Helder]

There are no diodes in through hole component that is less than 900mv meaning you will lose 1v on the end of the diode which will under power the Pi.