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Gareth
August 15, 2019, 06:16:37 AM by Gareth
Views: 92 | Comments: 2


Needed an additional clock for my 2nd fallout shelter, electronics are now operational, so thought it best to share current iteration.

What you see here is the High voltage / opto isolator /  Nixie driver board.
Current Shopping list :-
  • ESP32
  • Batch of New Old Stock Cold War Nixies
  • NE555 timer chip to develop the High Tension voltage via a flyback inductor.
  • DS3231 Real Time
...
Gareth
August 06, 2019, 11:12:09 AM by Gareth
Views: 436 | Comments: 2


Software defined radio (aka SDR), is a way of automating tuning into Audio/Digital radio receptions.

I am using a very simple (un-nervingly sensitive) USB dongle type RTL-SDR.COM

(cost inclusive antenna & mount was < £25).


This is able to tune through a huge spectrum of frequencies 0hz!! > 2.5Ghz

On a basic level it will tune into music radio station.....how ever where is the fun in that......

Also covers all the Radio Amateur bands , Dab radio and also Dab TV....etcetera

I am cu...
James
July 28, 2019, 08:30:41 PM by James
Views: 526 | Comments: 0



Hello Rebels!

I use CAD at work all day and recently a new drafter was talking about getting a custom macro pad called a streamdeck. The thing is basically a tablet with buttons on top so you can change the button icons to anything based on the application. While that looks cool and all, I encouraged him to try his hand at building his own macro pad with an arduino. As it turned out, he was not super interested in it, but at that point I already started working on one myself.  ;D

I found a 4x5 keypad on ebay that came with a plate, switches, and clear keycaps to make your own symbols. I used a pro micro, rainbow wire, small signal diodes & brass wire to make the mat...
May 21, 2019, 10:20:42 AM by BaldwinK | Views: 773 | Comments: 2

This tool finds the relationship between servo pulse time and rotational angle. A simple brief that uncovered a number of tricky issues.

When constructing any robot that moves, work has to be done to define the movement. If using pulsed servos then this ‘definition’ will likely be in µS and quite specific to the actual motor. Should the motor fail and be replaced, or a second bot made, then the definition will no longer be accurate.

Calibrating each joint in degrees, rather than µS, will remove the need to redo the original work.

So an optical shaft encoder is coupled to the joint ‘axle’ to act as an electronic protractor. Then a rotary switch is used to manually find the mechanical limits of the joint plus ...
April 10, 2019, 06:35:48 AM by BaldwinK | Views: 1218 | Comments: 1

As we are supposed to learn from our mistakes I have written up one of my failures.

The project was to build a bot, as cat like as possible, to sit and wave a paw, stand up and walk around.

 [ You are not allowed to view attachments ]

The activity started more than three years ago with an attempt to copy Boston Dynamics’ quadruped - Spot.  Believing the quoted torque values was the first mistake as the 55g servos could barely lift their own weight. The leg modules were later re-used for HybridTrotter and Scooter Boy where they provided the drive but the weight was carried on wheels.

Using a Picaxe micro, Hybrid Trotter was posted on their forum and the video shows a disinterested Meowth idly watching. A spirited Am...
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[Today at 10:11:28 PM]


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* Recent Posts

Just wanted to say Hi. by ErwinCanto
[Today at 10:11:28 PM]


Re: "1984 Nixie Time" by viswesh
[Today at 01:48:07 AM]


Re: "1984 Nixie Time" by James
[August 16, 2019, 06:37:11 AM]


"1984 Nixie Time" by Gareth
[August 15, 2019, 06:16:37 AM]


Re: SDR (Software Defined Radio) by Gareth
[August 14, 2019, 01:12:21 PM]


Re: SDR (Software Defined Radio) by fritsl
[August 09, 2019, 09:54:11 AM]


It may be dangerous to work in the virtual realm by fritsl
[August 09, 2019, 09:52:05 AM]


Re: PLX-DAQ by AmandaG
[August 06, 2019, 01:58:42 PM]


Re: DIY Yellow Servo by AmandaG
[August 06, 2019, 01:08:09 PM]


SDR (Software Defined Radio) by Gareth
[August 06, 2019, 11:12:09 AM]


Comp? :o by Impala
[August 02, 2019, 07:32:20 PM]


Re: Website to do list by Killer Angel
[August 02, 2019, 05:38:30 AM]


Re: Website to do list by James
[August 01, 2019, 05:57:22 AM]


Re: Website to do list by Killer Angel
[August 01, 2019, 02:23:00 AM]


Website to do list by James
[July 31, 2019, 07:34:53 PM]