[Guide] Graceful shutdown switch without Pololu [RETIRED]

Various user-contributed guides for hardware-related things
User avatar
alien0matic
Posts: 102
Joined: Wed Jun 08, 2016 7:20 am
Has thanked: 15 times
Been thanked: 23 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by alien0matic » Mon Aug 01, 2016 4:19 am

Thanks Camble, I got it all going now. Gate and Source were switched. Seems like there are a lot of different pinouts for those transistors.
Now everything works just fine, the DMG is closed again and I'm happy :)

PS: What GPIO would be better then GPIO4?

User avatar
Camble
Posts: 881
Joined: Thu May 05, 2016 2:31 am
Location: Scotland
Has thanked: 269 times
Been thanked: 487 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by Camble » Mon Aug 01, 2016 4:25 am

@alien0matic Glad to hear it. I found that most MOSFETs I used had the gate on pin 2, but the JFETs seemed to have the gate on pin 3. Some datasheets displayed a nice image of the package, making it easy to identify pins. Some showed the pinout from above, others showed the pinout from below. So... definitely worth taking the time to familiarise yourself with the particular JFET you are using. Maybe your 2N5460 was packaged by a different manufacturer and has a different pinout.

Do you have the link for the JFET you bought? I'd like to check it out to make sure others don't get stuck with the same issue.

Any regular BCM pin should be fine. https://pinout.xyz/

I think I used 22.

User avatar
alien0matic
Posts: 102
Joined: Wed Jun 08, 2016 7:20 am
Has thanked: 15 times
Been thanked: 23 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by alien0matic » Mon Aug 01, 2016 4:31 am

I bought those transistors. The gate is on the left pin when you look at the photo. http://www.ebay.de/itm/172276817585

User avatar
Camble
Posts: 881
Joined: Thu May 05, 2016 2:31 am
Location: Scotland
Has thanked: 269 times
Been thanked: 487 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by Camble » Mon Aug 01, 2016 4:46 am

That is unusual. Any datasheet I've seen for the 2N5460 has the gate on pin 3. Do you know what the logo on the JFET is?

Unfortunately I don't speak German. :(

SidSilver
Posts: 263
Joined: Sun May 22, 2016 6:22 am
Location: France
Has thanked: 137 times
Been thanked: 37 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by SidSilver » Mon Aug 01, 2016 5:21 am


jazzy
Posts: 23
Joined: Tue Jul 19, 2016 4:56 pm
Has thanked: 9 times
Been thanked: 1 time

Re: [Guide] Graceful shutdown switch without Pololu

Post by jazzy » Mon Aug 01, 2016 5:26 am

Camble wrote:For those who aren't in the Discord chat room, I ordered up the first revision of the PCB today. If all goes well, I'll be able to supply it with a switch, or without for you to solder your DMG-01 switch onto.
Hi Camble, I have an adafruit 1000c recharger and want to handle a graceful shutdown, would this part be relevant in my situation as well? If so how do i go about ordering a pcb from you? :D

User avatar
Camble
Posts: 881
Joined: Thu May 05, 2016 2:31 am
Location: Scotland
Has thanked: 269 times
Been thanked: 487 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by Camble » Mon Aug 01, 2016 5:40 am

@jazzy Yes, this circuit is designed for use with the Adafruit PowerBoost supplies. I'm currently waiting on delivery of an early design of the PCB and will start a sales thread when I have finished testing. Probably still be a few weeks as the boards are coming from the US.

jazzy
Posts: 23
Joined: Tue Jul 19, 2016 4:56 pm
Has thanked: 9 times
Been thanked: 1 time

Re: [Guide] Graceful shutdown switch without Pololu

Post by jazzy » Mon Aug 01, 2016 5:46 am

Ah nice, i'll keep a look out for it, i'm based in Scotland too so I don't know if that makes postage any easier, also might have another Scottish modder looking for a board too if you need numbers

User avatar
Popcorn
Trailblazer
Trailblazer
Posts: 354
Joined: Thu May 05, 2016 12:58 am
Location: Berlin
Has thanked: 29 times
Been thanked: 71 times

Re: [Guide] Graceful shutdown switch without Pololu

Post by Popcorn » Fri Aug 05, 2016 5:42 am

I have updated my original thread and the battery monitor github readme.md and have pointed them to this thread as the new recommended hardware solution over the pololu. I will be testing this circuit and if all goes well, I'll completely abandon support of the pololu and push this as the proper method to use. Thanks for your work, @Camble!

jazzy
Posts: 23
Joined: Tue Jul 19, 2016 4:56 pm
Has thanked: 9 times
Been thanked: 1 time

Re: [Guide] Graceful shutdown switch without Pololu

Post by jazzy » Fri Aug 05, 2016 5:45 am

Hi all, how tight is the original diy mod in the gameboy shell in the top left corner? Has anyone completed the mod and could post a photo for size?

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest