SAP – refocusing

The Lawnmower Man (1992)
Still from The Lawnmower Man (1992)

It’s been too long since I put some time into this project, so I’m going to outline goals broadly and then narrow into smaller components.


  1. Enumerate SIM software options, noting:
    -DK2 compatibility, Retail rift (CV1) compatibility (which has many moderate advantages over DK2), environmental data output capabilities, associated existing environmental data hardware.
  2. Enumerate environmental data hardware options. Most all options are for motion platforms, will these work for my full 3D system?
  3. Options for motion actuation, look into various high torque motor options. Variables include torque, rotation accuracy, rotation speed, control interface and compatibility with environmental data hardware.
  4. Physical design. Design different styles, noting size requirements, mass, portability, aesthetics, structural design and stress tolerance calculations. Construction may need some legal/insurance considerations.

Steps 1-3 represent the bulk of the electronic challenges. Step 4 is the physical challenge Continue reading “SAP – refocusing”

Beaumast Part 2

The main challenge installing guy wires onto a tiled roof was how to make anchor points. I went to a local antenna supplier and they told me the usual method is with these long self tapping o-ring bolts. So that’s what I did, it was much easier than I expected.

I used a diamond hole saw from eBay to make 2 holes in the roof tiles, and made use of an existing satellite dish mast for the final mounting point. I used threaded rod to attach a tapped o ring (or whatever you call it) to the satellite mast. Using a wet finger I was able to mold silicon around the anchor bolts in the roof tiles.

Part 1 ->

From my understanding it’s better to be earthed than not… I tried running conduit through this cement path using only an angle grinder and a chisel. This would have taken waay too long. Ended up buying a jack-hammer from gumtree (cheaper than renting). The second earth wire is from a UBNT Ethernet protector in the roof-space. This goes to a separate earth rod a small distance from the mast earth rod.

Installing Win 7 Fresh (in 2017)

  1. Obtain win 7 installation files.
    This site is a mirror for all the win 7 ISOs (in several languages), includes links to MSDN file hashes (after downloading, I used HashTools to compare hashes). Also there is a tricky possible solution here.
  2. Format a USB as a installation disk using Rufus.
  3. Install OS as Admin user, install critical drivers from hardware vendor website, use these instructions to bring computer up to date.
  4. Install Chrome, firefox, VLC, Microsoft Security Essentials, f.lux, adobe reader, skype, libre office.
  5. My keyboard has a rotary volume encoder so I installed 3RVX from softpedia for onscreen volume display, and I installed MemInfo to show RAM usage in the taskbar
  6. Create default non-admin user for logging in. Add autologin.

Project Secure Backup. Part 6

I moved the project to some acrylic in what is possibly the final stage for the project.While I thought the software reset for the Ethernet chip would suffice for connection problems, it appears this isn’t the case. I’ll try reprogramming the chip with an interrupt reboot for the main program loop, currently the device isn’t sending info to ThingSpeak.

Once the code is running smoothly (for at least a week) I’ll add email notifications. In the future I won’t use this Ethernet chip, there is a similarly priced chip I have which is much more capable.

Continue reading “Project Secure Backup. Part 6”

Hardware shutdown switch for RPi

Sometimes I need to power off one of my Raspberry Pis, and since I run these computers headless, going to a remote SSH terminal to issue a shutdown command can be extra work. I saw a webpage mentioning using a simple 2 pin jumper to initiate a shutdown script for the Pi. So that’s what I did (green tab on the GPIO pins), I chose python due to the wait_for_edge function.

This script will shutdown the RPi when the tab is pulled. Strangely the RPi will boot if you plug the jumper back in after it has shutdown, or if you pull it out after it has completed shut down (putting it back before it has completed shutting down). If there is no jumper in during boot, then the script will close.

#!/usr/bin/env python
#note crontab for superuser required a new PATH variable as here
import subprocess
 import RPi.GPIO as GPIO
except RuntimeError:
 print("Error importing RPi.GPIO! This is probably because you need superuser privileges. You can achieve this by using 'sudo' to run your script")

GPIO.setup(5, GPIO.IN) #Hardware Pullup on this pin..

ShutdownCommand = ['shutdown', '-h', 'now', '"System halted by GPIO action"']

if GPIO.input(5) == 0:
 #run script waiting for jumper removal
 GPIO.wait_for_edge(5, GPIO.RISING)
 KillProcess = subprocess.Popen(ShutdownCommand, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 MountData, MountError = KillProcess.communicate()

Then I simply added this script to the bottom of my root crontab (sudo crontab -e) to run at reboot:

@reboot python /usr/local/sbin/

DIY USB charger

20160920_222327-2I got a hold of a USB outlet from ebay, and I wanted to use it basically as a hub for charging. I sourced a 3A 12V plug-type power supply which I figured would work well with the ‘UBEC 5V buck converter I got made for RC plane receivers, changed the UBEC cables to DC barrel jacks and. hmm doesn’t work.. :/