ottpossum garden

Caffenol as a C-41 replacement (R.1.)

tags: Film, Coffee, Caffenol 11/01/2020

Notes

Example pictures:

R.1. only denotes that it’s my “Recipe one” for my own purposes.

Uses at your own risks, my first try for C-41 replacement was a complete failure a few years ago.

Every containers bath in a box of water with a fish tank heater set to around 22C, which leads to inside-bottles water of ~21C.

Prepare your fixer in capped bottle (I uses Ilford Rapid Fixer in 1:4 ratio), and two 1L bottle of water, plus a 500ml one, put all bottles in the heated tank water and let it sit a few hours, check with a food thermometer (the ones with a long metal dart) frequently until the desired temperature is reached, in the tank, and in the bottles.

Notes

Example pictures:

R.1. only denotes that it’s my “Recipe one” for my own purposes.

Uses at your own risks, my first try for C-41 replacement was a …

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Building a Linux 5.5.0-rc1 kernel for SPARC-32 for christmas

tags: howto, linux, sparc32 17/12/2019

A newer, up-to-date guide is available here: https://squeaky.tech/2022/03/13/building-a-linux-5-17-rc7-kernel-for-sparc32-for-fun/

Most of the files mentionned are available at: dashie/sparc32: Dashie’s various sparc32 things - sparc32 - Dashie’s gitea

This git repository also contains a bootable gentoo-sparc-2005.0-20050413.tftpboot with a 2.x kernel, the rootfs contained into that tftpboot file has been extracted to gentoo-sparc-2005.0-20050413.initrd that you can use, without any kernel modules or newer busybox because of space restriction, but it does have an init and dropbear and more tools than juste a busybox.

A newer, up-to-date guide is available here: https://squeaky.tech/2022/03/13/building-a-linux-5-17-rc7-kernel-for-sparc32-for-fun/

Most of the files mentionned are available at: dashie/sparc32: Dashie’s various sparc32 things - sparc32 - Dashie’s gitea

This git repository also contains a …

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Diskless booting OpenBSD on a MVME167 in 2019

tags: 68k, mvme, openbsd 15/11/2019

Softwares setup

We will uses a virtual machine with Devuan on VirtualBox, download it and setup two interface cards:

  • eth0: NAT
  • eth1: BRIDGE to your ethernet card

Asumptions

  • Your server is going to be named “laptop” with the IP “10.0.0.1”.
  • Your MVME167 board is going to be named “mvme167” with the IP “10.0.0.2”
  • The MVME167 board will have the mac “08:00:3e:22:77:53”
  • The latest OpenBSD with m68k support is 5.5

Boot the VM and start the setup:

Softwares setup

We will uses a virtual machine with Devuan on VirtualBox, download it and setup two interface cards:

  • eth0: NAT
  • eth1: BRIDGE to your ethernet card

Asumptions

  • Your server is going to be named “laptop” with the IP “10.0.0.1”.
  • Your MVME167 board is going to be …
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Sony E-Mount lens chip tap

tags: Sony, Lens, EMount, Reverse, Teensy 28/04/2019

I’m interested by a reverse ing of the Sony E-Mount protocol and I needed to make a “tap” to dump serial datas.

Looking at the back of the lens, flat pads, on bottom, pinout is (left to right):

  1. lens gnd
  2. lens pwr
  3. logic gnd
  4. body vd lens
  5. logic pwr
  6. lens cs body
  7. rxd
  8. txd
  9. body cs lens
  10. lens xdetect

The pins which have been broken out are: 3, 4, 6, 7, 8, 9

I’m interested by a reverse ing of the Sony E-Mount protocol and I needed to make a “tap” to dump serial datas.

Looking at the back of the lens, flat pads, on bottom, pinout is (left to right):

  1. lens gnd
  2. lens pwr
  3. logic gnd
  4. body vd lens
  5. logic pwr
  6. lens cs body
  7. rxd
  8. txd
  9. body cs lens …
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Open Source,Hardware DIY Reflected Light Meter

tags: lightmeter, photography, diy 24/01/2019

I’ve used this old project as a source, it was an incident one, and I made a reflected one (doesn’t have a dome).

My main differences are the use of a TSL2591 instead of TSL2561, a RED/GREEN LED rotary encoder, a BL-5C battery, and a PCB to fit everything, and a whole firmware rewrite.

My project sources are here.

I’ve choosed a BL-5C battery because they are cheap, and easy to find, and doesn’t need a whole disassembly to swap.

I’ve used this old project as a source, it was an incident one, and I made a reflected one (doesn’t have a dome).

My main differences are the use of a TSL2591 instead of TSL2561, a RED/GREEN LED rotary encoder, a BL-5C battery, and a PCB to fit everything, and a whole firmware rewrite. …

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