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• Final Video

  Machinehum (Ryan Walker) • 11/04/2021 at 18:01 • 0 comments

  Here is the final video for my project :) It's just a simple overview

• Final Build Boots

  Machinehum (Ryan Walker) • 11/03/2021 at 22:11 • 0 comments

• Final Build Complete!

  Machinehum (Ryan Walker) • 10/26/2021 at 00:45 • 0 comments

  The build is complete! Here is the latest and final blog post!

• Printed Mechanical Enclosure

  Machinehum (Ryan Walker) • 10/18/2021 at 17:07 • 0 comments

  I've dusted off the old 3D printer and printed the mechanical enclosure, so amazing seeing it come to life! I'm hoping to get a full build finished this week! Stay tuned. PS Blog post 3 is up.

• Form Factor Boards Arrive!

  Machinehum (Ryan Walker) • 09/23/2021 at 16:32 • 0 comments

  The boards have arrived! And with that another blog post is live! Link to newest blog post here.

• Mains Blade Interface

  Machinehum (Ryan Walker) • 07/27/2021 at 17:43 • 0 comments

  I've been scouring the internet trying to find an off-the-shelf part like this...

  The part circled above it is a through-hole stamped part that makes contact with the blade connector, it's the power entry connector for the board. It's an extremely low-cost connector that has to be done right. If the component is to fail it could short against other components causing a fire. The component that actually plugs into the wall is custom as well and is "insert moulded" directly into the case itself. As I couldn't find any existing component I would have to draw one up myself, being new to FreeCAD and mechanical engineering I knew this one would be a challenge. Poking around enough, I found the Sheet Metal Toolbox to be the tool. This toolbox is for sheet metal, you lay out a flat design and add bends where you please. As a starting point, I desoldered a contact from the board above and flattened it out...

  Then sketched it flat...

  To make bends you sketch a line, then click the line and face. You define a bend angle and bend radius.

  I then integrated it into the board file in Kicad exported a step file and reimported it into the FreeCAD assembly, there is still some alignment to be done but it's good enough for now.

  Until next time ;) !

• [ 1.042110] Waiting for root device /dev/mmcblk0p1...

  Machinehum (Ryan Walker) • 07/01/2021 at 17:30 • 0 comments

  Buildroot is a cruel mistress... I've started building the image from the A33-OLinuXino. I used the open source files from this as a reference design for the wifi wart; I thought it would be a breeze. It turns out the PMIC used by Olinux has all the bells and whistles, I2C for control which u-boot (system bootloader) needs to configure voltages and whatnot. After ripping all that code out, I got to a point where the bootloader jamming the kernel into RAM and changing the program counter to the start address. However, I'm getting stuck on some mmc stuff...

  U-Boot SPL 2021.01 (Jun 30 2021 - 12:27:42 -0700)
  DRAM: 1024 MiB
  Trying to boot from MMC1
  
  
  U-Boot 2021.01 (Jun 30 2021 - 12:27:42 -0700) Allwinner Technology
  
  CPU:   Allwinner A33 (SUN8I 1667)
  Model: Olimex A33-OLinuXino
  DRAM:  1 GiB
  MMC:   mmc@1c0f000: 0
  Loading Environment from FAT... Unable to use mmc 0:1... Setting up a 800x480 lcd console (overscan 0x0)
  In:    serial
  Out:   vga
  Err:   vga
  Net:   No ethernet found.
  starting USB...
  Bus usb@1c19000: No host cable detected: Port not available.
  Hit any key to stop autoboot:  2  1  0 
  switch to partitions #0, OK
  mmc0 is current device
  Scanning mmc 0:1...
  Found U-Boot script /boot/boot.scr
  294 bytes read in 2 ms (143.6 KiB/s)
  ## Executing script at 43100000
  21702 bytes read in 3 ms (6.9 MiB/s)
  4058272 bytes read in 187 ms (20.7 MiB/s)
  ## Flattened Device Tree blob at 49000000
     Booting using the fdt blob at 0x49000000
     Using Device Tree in place at 49000000, end 490084c5
  
  Starting kernel ...
  
  [    0.000000] Booting Linux on physical CPU 0x0
  [    0.000000] Linux version 5.0.0 (machinehum@whitebox) (gcc version 10.3.0 (Buildroot 2021.05-280-g6dd9e246a7)) #1 SMP Wed Jun 30 11:51:11 PDT 2021
  [    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
  [    0.000000] CPU: div instructions available: patching division code
  [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
  [    0.000000] OF: fdt: Machine model: Olimex A33-OLinuXino
  [    0.000000] Memory policy: Data cache writealloc
  [    0.000000] cma: Reserved 16 MiB at 0x7dc00000
  [    0.000000] psci: probing for conduit method from DT.
  [    0.000000] psci: Using PSCI v0.1 Function IDs from DT
  [    0.000000] random: get_random_bytes called from start_kernel+0x98/0x3fc with crng_init=0
  [    0.000000] percpu: Embedded 16 pages/cpu @(ptrval) s34572 r8192 d22772 u65536
  [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 260233
  [    0.000000] Kernel command line: console=ttyS0,115200 root=/dev/mmcblk0p1 rootwait panic=10
  [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
  [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
  [    0.000000] Memory: 1011440K/1047076K available (6144K kernel code, 436K rwdata, 1516K rodata, 1024K init, 242K bss, 19252K reserved, 16384K cma-reserved, 244248K highmem)
  [    0.000000] Virtual kernel memory layout:
  [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
  [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
  [    0.000000]     vmalloc : 0xf0800000 - 0xff800000   ( 240 MB)
  [    0.000000]     lowmem  : 0xc0000000 - 0xf0000000   ( 768 MB)
  [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
  [    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
  [    0.000000]       .text : 0x(ptrval) - 0x(ptrval)   (7136 kB)
  [    0.000000]       .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)
  [    0.000000]       .data : 0x(ptrval) - 0x(ptrval)   ( 437 kB)
  [    0.000000]        .bss : 0x(ptrval) - 0x(ptrval)   ( 243 kB)
  [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
  [    0.000000] rcu: Hierarchical RCU implementation.
  [    0.000000] rcu: 	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
  [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
  [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
  [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
  [    0.000000] GIC: Using split EOI/Deactivate mode
  [    0.000000] arch_timer: cp15 timer(s) running at 24.00MHz (phys).
  [ 0.000000] clocksource: arch_sys_counter:...

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