Hey, I’m trying to work through building a handheld gaming device centred around a Raspberry Pi 4 / Pijuice / and a 10 inch screen (I tested the screen on a 5v 1amp usb power adapter and it was fine).
So far I have the Pi 4 and Pijuice connected fine, however I’m trying to figure out how I can power the screen. The screen can be typically be powered just fine from a USB socket but its too much to power it directly from a spare USB output on the Pi…I tried it, nothing works (and I understand the P4 is pushing the power limit of the Pijuice anyway).
So I’m left with either powering it from a separate portable battery pack or try and find a way to power it from the same battery as the Pijuice.
I was wondering…
If I bough this battery: https://core-electronics.com.au/3-pin-lipo-battery-for-pijuice-20000mah.html and split the red and black into an additional JST connector, that would effectively give me two outputs:
A: 3.7v + NTC temperature sensor lead (connected to Pijuice, and Pijuice can still do all of its battery management magic…I would also charge via the Pijuice)
B: 3.7v JST connected to this: https://core-electronics.com.au/powerboost-500-charger-rechargeable-5v-lipo-usb-boost-at-500ma.html this is the only thing I could find that would take a Lipo input and convert it into a USB output that I can then power the screen with
I checked the specs on the battey and it says the max continuous discharge it 1c, which I ‘think’ at 20,000ma means its can safely sustain 20amp at 3.7v…which should be well within spec.
…I want to check all this as I basically made it all up and have not idea if I’m just going to fry everything trying?!