Search found 43 matches

by othermod
Tue Sep 13, 2016 7:26 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

@othermod I'm not sure to be honest. The trouble I'm having is how to add an RC delay to my circuit with the DPDT switch. It should signal a shutdown, but also cut the power after 45 seconds for example. I'm not too great with capacitors, but I understand the general idea behind RC timers. @Camble ...
by othermod
Tue Sep 13, 2016 6:12 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

@Camble This circuit might interest you. That's exactly the circuit I based the EveryCircuit design on. So the reason it has 3 FETs is because I am unsure whether the GPIO pin switches to GND when the shutdown completes, or if it is just pulled to GND with the internal 40kohm resistor. If it's switc...
by othermod
Tue Sep 13, 2016 6:01 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

I've just started working on a psp as well and for the power button I was thinking about using the hold switch instead of the power switch for the power button since it's the latching kind. I figured it might be a bit more simple to setup that way. That's what I did initially, and it's definitely t...
by othermod
Sun Sep 11, 2016 7:38 pm
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

@Camble @Helder I've been working on an emergency shutdown button for the banggood power supply on/off circuit. At first, I was thinking about just using a second button, but I have a different option. This turns the dual mosfet circuit into a triple mosfet circuit. It's a latching on/off, with a lo...
by othermod
Thu Sep 08, 2016 9:39 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

ugh, I'm stoked to see this. especially after watching wermy do his new video building a gbzero with all customer parts no GB actually being used. I've got a psp shell in my amazon cart ready to buy when we have boards ready to go! :D I'm continuing to work on it, getting closer every day. I got a ...
by othermod
Sat Sep 03, 2016 1:11 pm
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

Okay so I built the circuit in EveryCircuit. Instead of the TX pin and a GPIO pin, one GPIO pin is used both for pulling the n MOSFET high and for issuing the shutdown command. The only thing it's missing is an emergency shutdown after a long button press. http://everycircuit.com/circuit/45752390312...
by othermod
Thu Sep 01, 2016 8:06 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

I think you're correct, but the UART TX pin seemed to stabilize at 3.3v after 8-10 seconds, whereas a BCM pin with the gpio-poweroff flag set will stabilize after 5 seconds. Again, I'm not sure about reboots. This may be helpful http://sudomod.com/forum/viewtopic.php?f=20&t=97&start=330#p10970 That...
by othermod
Wed Aug 31, 2016 7:53 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

@othermod Good question. I'll have to check. Also, you need to add the following line into /boot/config.txt dtoverlay=gpio-poweroff,gpiopin=22,active_low="y" @Camble Okay I've been reading through the posts, trying to wrap my head around everything. Does the config code only make the GPIO pin go lo...
by othermod
Wed Aug 31, 2016 5:30 am
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

@othermod I originally borrowed the UART pin idea from @Popcorn but we decided using a BCM pin was stable in half the time during boot up. The schematic I've designed to go with the banggood supply is essentially the same as your dual MOSFET setup. @Camble How does that pin (I think it's 22 from re...
by othermod
Tue Aug 30, 2016 5:39 pm
Forum: Hardware Help
Topic: Pi in a PSP
Replies: 99
Views: 107743

Re: Pi in a PSP

I have seen your image and wasn't sure where people got their info but the question I have is will that work with that BangGood power supply I saw you used in your original build? Many people on here use this power supply and if there is an easy way (with a board made) to shut it off that would be ...