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35Instructables1,491,594Views10,920CommentsUK LincolnshireJoined August 30th, 2006
Retired technology teacher - 2 kids, I have an Hons deg in Design and Technology - 28 years as Computer systems engineer Trained as Electronics engineer in the Royal Air Force

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  • rickharris commented on ohowson's forum topic Pallets for Kids10 days ago

    Bird boxes classic project.

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  • http://www.ti.com/lit/ds/symlink/tl1431m.pdf

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  • rickharris commented on andyj82's forum topic I want to learn coding26 days ago

    There is much experience and practical teaching skills that say you should start with the very basics of programming, learn to break your problem down in a flow chart or similiar, draw an input output grid and ONLY then start programming.What language you learn isn't that important as it is just a set of commands and syntax BUT learning to analyse the problem and solve it on paper with a pencil will save you many many hours of debugging and programming the wrong thing.You wouldn't go on holiday by turning up at the airport and buying a ticket at random, you plan, decide how much to spend, where to go, what clothes etc to pack - Neither should you start programming by sitting at a keyboard.Often your platform will decide what language to learn so maybe start there - there are lots of sm...

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    There is much experience and practical teaching skills that say you should start with the very basics of programming, learn to break your problem down in a flow chart or similiar, draw an input output grid and ONLY then start programming.What language you learn isn't that important as it is just a set of commands and syntax BUT learning to analyse the problem and solve it on paper with a pencil will save you many many hours of debugging and programming the wrong thing.You wouldn't go on holiday by turning up at the airport and buying a ticket at random, you plan, decide how much to spend, where to go, what clothes etc to pack - Neither should you start programming by sitting at a keyboard.Often your platform will decide what language to learn so maybe start there - there are lots of small cheap microprocessor platforms available now.

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  • How to Ask a Question in Instructables.

    Please ask in the main questions area.

    I am not too sure if this is a question for me - However I have an odd workshop where I mainly do small woodwork and jewellery projects with the occasional electronics project or repair and model aircraft build thrown in. It is in my double garage and I set it up as a mezzanine so i could still get 2 cars in the garage.It doesnt have seperate areas as the space is compact so I clear the bench for each project I do.

    Please ask in the main question area of the forum.

    Please ask in the main question area of the forum.

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  • rickharris commented on andyj82's forum topic I want to learn coding5 weeks ago

    https://www.instructables.com/id/Lets-Program-a-PI...

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  • rickharris commented on rickharris's instructable Systems and Control Handbook3 months ago
    Systems and Control Handbook

    http://sciexplorer.blogspot.co.uk/2014/08/what-is-...Check out Quantum theory of electrons.Reality is what we "know" is just a model, a simple way to visualise what is happening, Models have changed a lot over the years and will change again.ALL modern cars now have the negative ground.I was trained in the RAF as an electronics engineer, using electron flow because we were using valves. The main change to "Positive hole flow" came with the introduction of transistors. However many people who are none electrically aware still think electricity flows from Positive to negative, right or wrongly

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  • rickharris posted a topic Doesn't work3 months ago
  • rickharris posted topics BUGS and BUGS again3 months ago
  • rickharris commented on rickharris's instructable A Traditional Rocking Horse.3 months ago
    A Traditional Rocking Horse.

    The front legs and the back legs are slightly different shapes. Hence 2 patterns.

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  • rickharris commented on rickharris's instructable How to Make Gears Easily3 months ago
    How to Make Gears Easily

    There are a number of FREE CAD tools that will help you. A google search should find some.Sketchup is perhaps the best known although has a steep learning curve.A 2D CAD tool is perhaps best for drawing these gears.

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  • rickharris commented on rickharris's instructable Systems and Control Handbook3 months ago
    Systems and Control Handbook

    Conventiona; current flow is a thing. Right or wrong. Even school science depts teach it as if real.I had to allow for my students hearing this and so needed to understand it.i beleive I am very clear about electron frow, and personally only use electron flow. Neg to Pos.Of course current thinking says electrons don't flow at all then vibrate in place exchanging energy.

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  • rickharris posted a topic Unable to flag Spam3 months ago
  • rickharris posted a topic BUGS BUGS BUGS4 months ago
  • rickharris posted a topic BUG4 months ago
  • rickharris commented on orangeberry12's instructable How to Make Robot Wheels4 months ago
    How to Make Robot Wheels

    You can make an adequate wheel for flat surfaces by simply adding a suitable rubber band around the edge of the printed centre. Quick, easy and cheap. (perhaps not quite so classy though)

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  • rickharris commented on tugceko's instructable Raspberry Pi Park Sensor7 months ago
    Raspberry Pi Park Sensor

    This is fine if it is mounted in a garage but potential project users should be aware that the standard Ultrasonic TX/RX are NOT waterproof. They don't last long mounted on a car bumper.

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  • rickharris commented on rickharris's instructable Making a Really Simple Rabbit Trap8 months ago
    Making a Really Simple Rabbit Trap

    But it costs money! and is very similiar to mine.

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  • Led Movie Projector Hack/Mod (runs Cooler and With Less Noise)

    Ah but if the LED burns out in say 2 years of use most people are going to go out and buy a NEW projector. Happy days. (if a little short sighted).

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  • rickharris commented on rickharris's instructable Technical Sketching and Drawing.9 months ago
    Technical Sketching and Drawing.

    I am not totally sure what you want. Google searches may lead you somewhere. If you need free CAD software Google Sketch up is a good free start. There are several 2D CAD systems available as well HOWEVER you could have drawn the project a dozen times over by the time you learn how to use the CAD system.

    Mre recently AutoCAD Fusion 360.

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  • Threaded Rods and Nuts in Fusion360

    Just curious how long does it take to print?

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  • rickharris commented on Joerg Engels's instructable Culurgiones10 months ago
    Culurgiones

    Very neat will try this. Thanks.

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  • rickharris commented on monkeywork's instructable I Wanted to Build My Own Watch10 months ago
    I Wanted to Build My Own Watch

    Nice. friend of mine got an $8000 Breitling watch for his retirement, Strange but it tells exactly the same time as my $200 Seiko !! Still I guess he gets a charge out of wearing it.

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  • rickharris commented on DavidB685's instructable DHC-1 Chipmunk10 months ago
    DHC-1 Chipmunk

    DTFB a la https://www.flitetest.com/

    Impressive. Would make a good DTFB plan.

    https://aerofred.com/search.php?search_keywords=ch...plans, many free.

    try https://aerofred.com/for suitable convertable plans.

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  • rickharris commented on wirecrochet's instructable Wire Crochet for Beginners 11 months ago
    Wire Crochet for Beginners

    Your work is impressive, in the UK this technique is called French knitting, Some times called Viking knitting although the stitches then are often formed by threading the wire by hand.lovely.

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  • rickharris commented on rickharris's instructable How to Ask a Question in Instructables.11 months ago
    How to Ask a Question in Instructables.

    I suggest you copy and paste the question into a new question in the answers section. More people will see it.This is just an instructable to show HOW to ask a sensible question.https://www.instructables.com/tag/type-question/?s...

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  • rickharris commented on rickharris's instructable Making a Really Simple Rabbit Trap12 months ago
    Making a Really Simple Rabbit Trap

    When the trigger is pushed towards the back of the trap it is freed from the wire and releases the longer stick that holds up the door. Make it just as shown and it will work. Ask again when built if you have problems.

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  • rickharris commented on Nikus's instructable Arduino Drone | Quadcopter (3D Printed)1 year ago
    Arduino Drone | Quadcopter (3D Printed)

    I have been flying fixed wing models since the 60's when I had to build the RC equipment myself, so my experience of drones is only what I hear from fellow flyers or see in the press. However I do agree that commercial models may well also lack the safety critical features they should have.Although the concept of safety critical systems is largely a commercial issue any responsible person making something that could almost certainly be a danger to the public should be thinking of these problems.For 20+ years I developed commercial software for operating all kinds of machinery. Safety regulations vary considerably across Europe. Machinery bought in Italy couldn't be made safe enough to be used in a UK factory environment without enclosing the machine in a human proof cage. In my opinion ...

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    I have been flying fixed wing models since the 60's when I had to build the RC equipment myself, so my experience of drones is only what I hear from fellow flyers or see in the press. However I do agree that commercial models may well also lack the safety critical features they should have.Although the concept of safety critical systems is largely a commercial issue any responsible person making something that could almost certainly be a danger to the public should be thinking of these problems.For 20+ years I developed commercial software for operating all kinds of machinery. Safety regulations vary considerably across Europe. Machinery bought in Italy couldn't be made safe enough to be used in a UK factory environment without enclosing the machine in a human proof cage. In my opinion the manufacturer was negligent and open to prosecution if anyone got hurt.

    Not at all what the authorities don't want is stupid people flying in airways, Invading peoples privacy and generally behaving in an irresponsible manner.Alas the fall in the cost of RC equipment has meant that many people can now afford to buy equipment that they do not have the knowledge or training to use safely.It isn't a matter of repression - in fact in the 1960's when I first started in RC flying being responsible and belonging to a flying club was part of the package. It cost a lot so you were careful.Not so these days where I see kids and adults flying in close proximity to the public, Where I see reports of drones flying close to airliners and flight paths. Where I see poorly trained and skilled people putting others at risk. That's why you get legislation against the hobby.St...

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    Not at all what the authorities don't want is stupid people flying in airways, Invading peoples privacy and generally behaving in an irresponsible manner.Alas the fall in the cost of RC equipment has meant that many people can now afford to buy equipment that they do not have the knowledge or training to use safely.It isn't a matter of repression - in fact in the 1960's when I first started in RC flying being responsible and belonging to a flying club was part of the package. It cost a lot so you were careful.Not so these days where I see kids and adults flying in close proximity to the public, Where I see reports of drones flying close to airliners and flight paths. Where I see poorly trained and skilled people putting others at risk. That's why you get legislation against the hobby.Stupid selfish people.

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  • Scratchbuild Discuss Launch Glider (DLG)

    In general what you need to be detecting is pressure changes. Look up glider variometer, there are model versions around.The temperature change from sinking to rising air in a thermal would be very small and hard to measure on a moving platform.However DLG gliders are a lot of fun and with a reasonable design flights in terms of 2 mins + should be easy to attain.a better design can be found at:https://www.flitetest.com/articles/foamboard-spins...

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  • Tesla Free Energy Air Circuit Design and Testing

    https://en.wikipedia.org/wiki/Wireless_power_trans...That wasn't my point. This type of energy leech is "cashing in " on the wealth of high power radio transmissions that surround us.It isn't extracting energy from the ether. And neither did Tesla.

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  • rickharris commented on Nikus's instructable Arduino Drone | Quadcopter (3D Printed)1 year ago
    Arduino Drone | Quadcopter (3D Printed)

    1. There are rules designed to offer some safety to people and property in the vicinity of flying objects, this is why all flying even model flying is controlled by the FAA.2. For your own well being and people around you you should not fly unless insured.3. I come from an Industrial computing background. For liability reasons we would not use a hobby, or unapproved microprocessor in a safety critical situation. IF something goes wrong you leave yourself open to massive and justified litigation.Illegal depends. If anything goes wrong your insurer will probably disown you. Flying without suitable third party insurance is certainly illegal in the UK anyway *(although many do). This would make using the Arduino illegal.I know there are lots of boards, controllers etc out there containing...

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    1. There are rules designed to offer some safety to people and property in the vicinity of flying objects, this is why all flying even model flying is controlled by the FAA.2. For your own well being and people around you you should not fly unless insured.3. I come from an Industrial computing background. For liability reasons we would not use a hobby, or unapproved microprocessor in a safety critical situation. IF something goes wrong you leave yourself open to massive and justified litigation.Illegal depends. If anything goes wrong your insurer will probably disown you. Flying without suitable third party insurance is certainly illegal in the UK anyway *(although many do). This would make using the Arduino illegal.I know there are lots of boards, controllers etc out there containing Arduino or other uncertified controllers, That's just the way the world is. It isn't illegal to make them. AFAIK or can see there isn't anyway for a hobbyist or small producer to get the software and hardware certified for use in safety critical situations - My opinion.MUCH electrical equipment that originates in China is also Illegal to use as received - In the UK anyway. but they still make and sell it.

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  • rickharris commented on Nikus's instructable Arduino Drone | Quadcopter (3D Printed)1 year ago
    Arduino Drone | Quadcopter (3D Printed)

    I admire your efforts. People however should note:1. In the USA and in Europe this is almost certainly illegal to fly. There are strict rules about radio controlled models.2. Hobby microcontrollers should not be used in mission critical situations - this is one, if this goes astray people could get hurt - that's the definition of mission critical.3. Both in Europe and in the USA strict regulations have been put in place concerning flying drones, A big reason is because irresponsible people ignored fairly obvious safety issues resulting in authority getting very upset. I fly RC aircraft all the time in the UK and do not want my hobby to be regulated out of existence because of the actions of a few unthinking people.I don't believe this quad will meet the USA or Europe regulations.Nice w...

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    I admire your efforts. People however should note:1. In the USA and in Europe this is almost certainly illegal to fly. There are strict rules about radio controlled models.2. Hobby microcontrollers should not be used in mission critical situations - this is one, if this goes astray people could get hurt - that's the definition of mission critical.3. Both in Europe and in the USA strict regulations have been put in place concerning flying drones, A big reason is because irresponsible people ignored fairly obvious safety issues resulting in authority getting very upset. I fly RC aircraft all the time in the UK and do not want my hobby to be regulated out of existence because of the actions of a few unthinking people.I don't believe this quad will meet the USA or Europe regulations.Nice work though.

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  • rickharris commented on advaym's instructable How to Photograph the MOON1 year ago
    How to Photograph the MOON

    Just a small point the moon only appears bigger at the horizon, it's not really bigger. In a photograph it will be exactly the same as at the zenith.In fact as your looking through a thicker layer of atmosphere your photograph may be worse.just a small thing.

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  • Electric Go Kart in Retro Style (for Kids)

    You have left out much essential detail that people might want to copy your project:How have you made the king pins (steering)How does the steering workHow did you connect up the motor electricallyHow do the brakes work.How much does the car weigh without the driver and battery pack.they may be in the video (which I haven't watched yet) but it is useful to discuss them as they are difficult areas to manufacture.https://www.instructables.com/id/Building-an-elect...http://www.thenorwoodhome.com/2008/09/building-an-...

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  • rickharris commented on omars2's instructable Power Booster Circuit 48W to ~600W1 year ago
    Power Booster Circuit 48W to ~600W

    So your instructable doesn't show any circuit diagram.You claim to be able to increase Voltage AND Current thus increasing the power output of the battery pack to some practically usable level..HOW?Were this possible you could drive a 240 volt motor and a 12 volt generator and recharge the battery pack.

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  • rickharris commented on rickharris's instructable How to Make Gears Easily1 year ago
    How to Make Gears Easily

    your comment "a very good instruct able but it isn't your..."I assume this continues you're idea???

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  • rickharris commented on rickharris's instructable How to make gears easily1 year ago
    How to make gears easily

    As far S I know this is my original idea, unless you can show otherwise?

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  • rickharris commented on guyfrom7up's instructable Free Energy1 year ago
    Free Energy

    Cancer is caused by may things - primary in the west by a diet poor in fiber - colon and pancreatic cancers and by old age as the DNA copies bits at the end get left off at some point this will trigger some change in cellular activity resulting in cancer, smoking alcohol, sun burn all contribute.Foods that are good sources of vitamin B12 include:Beef, pork, ham, poultry, and lambFish, especially haddock, and tunaMilk, cheese, and yogurtSome nutritional yeast productsEggs.it doesn't look all that hard to get enough B12 in your diet. At least in the UK it is added to breakfast cerial.

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  • rickharris commented on guyfrom7up's instructable Free Energy1 year ago
    Free Energy

    Sorry but I beg to differ on this"In radiometry, radiant energy is the energy of electromagnetic and gravitational radiation. The SI unit of radiant energy is the joule (J). The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time."Any conductor/rectifier/coil/capacitor is picking up radiated energy from radio sources. Generally commercial radio networks that radiate kilowatts of energy. Yes extracting this is possible, on a small scale it may not matter much but enough to run your house is going to suck a BIG hole in the radio transmission around your [lace.IMHO Tesla is today somewhat over rated. Yes he proposed AC transmission rather then DC and made some discoveries in the field of RF generation but from what I read expla...

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    Sorry but I beg to differ on this"In radiometry, radiant energy is the energy of electromagnetic and gravitational radiation. The SI unit of radiant energy is the joule (J). The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time."Any conductor/rectifier/coil/capacitor is picking up radiated energy from radio sources. Generally commercial radio networks that radiate kilowatts of energy. Yes extracting this is possible, on a small scale it may not matter much but enough to run your house is going to suck a BIG hole in the radio transmission around your [lace.IMHO Tesla is today somewhat over rated. Yes he proposed AC transmission rather then DC and made some discoveries in the field of RF generation but from what I read explained little of what he actually did discover, making hints at a number of other things, including free energy and death rays which didn't come to anything in his life time.We do in fact run Tesla's energy grid today, or at least a modern equivalent. The pylon transmission lines carry AC at 225 - 250 kV eventually locally transformed down to 11 KV and then down to house hold mains @, In most of the world. 220 - 240 volts.Sorry to say my car does not have a high voltage auto transformer or HT coil in it to generate HT for the spark plugs, its a diesel. But a high frequency Tesla coil and an auto HT coil although related are different beasts it is charged at a very modest rate and relies on the distributor points braking the charge circuit to generate the HT spark.Tesla not withstanding - If you can explain practically how anyone can store static electricity for distribution then I for one will invest in your stock.Sadly although lightening and other static sources produce potentials of millions of volts there is very little current involved making static useless for powering anything. The voltages alone make harvesting it impractical at our current stage of technology.PS anyone can generate a few million volts of static electricity using a van de graf generator and happily draw sparks from it with their fingers. NOT recommended with lightening.

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  • rickharris commented on guyfrom7up's instructable Free Energy1 year ago
    Free Energy

    Possibly, but at a microscopoly small and almost undetectable level. Our mechanical machines, motors, generators, electronics produce a magnetic field many millions of times greater but we still cannot harvest meaningful energy from this source.

    Rewrite?

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  • rickharris followed DIYPerks1 year ago
      • Make a 1000w equiv. LED flashlight!
      • Enchanted Forest Mushroom Lights
      • Simple DIY Solder Fume Extractor
  • rickharris commented on braulio777's instructable 3x3x3 Red LED Cube1 year ago
    3x3x3 Red LED Cube

    For the code. I guess, this was 3 years ago!

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  • rickharris commented on StephanP1's instructable Ingeniously simple mousetrap1 year ago
    Ingeniously simple mousetrap

    I love the trap :-) however your mouse is almost of the house variety and will come back into the warm comfort of you house unless you walked him 2 or 3 miles away!

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  • Smart Attendance System (Intel Edison Inside)

    Probably. However that won't get you over the practical limitations.I assume this is a student project.Your now in that area where you have to do your own research and evaluation. You need to look at equipment specifications - Evaluate how others have done this and start to think about the skills your going to need to make it work.It is NOT for others to do this work for you. Otherwise your degree/exam qualification would belong to them!Start reading, taking notes and valuatingI repeat that from a purely practical point of view this isn't a workable system for schools, at least not in the UK.

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  • rickharris commented on Simran Sharma's instructable Miniature Barbie injection1 year ago
    Miniature Barbie injection

    I don't know why but this worries me.

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  • rickharris commented on rickharris's instructable Making a really simple rabbit trap1 year ago
    Making a really simple rabbit trap

    I doubt it a racoon has very mobile hands and will soon find out how to lift the door as it isn't latched down.As I built it it would fit a Racoon either.HOWEVER the principles could / should work. You need to make a method of latching the door closed once it is down, a normal gate latch could work or a simple spring latch as in the picture below (Click to see full size)

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  • rickharris commented on seamster's instructable Tennis Balls in a Bottle (How-to!)1 year ago
    Tennis Balls in a Bottle (How-to!)

    Ok - Now the hard part - take them out!

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  • rickharris commented on XYZAidan's instructable Flat Soft Actuators From Images1 year ago
    Flat Soft Actuators From Images

    Why not take a balloon and attach to a straw? If you want a particular shape, make a frame to snap round the balloon.

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  • rickharris commented on BleronR's instructable Cheat on Exams Using Water Bottles1 year ago
    Cheat on Exams Using Water Bottles

    Ah yes, unfortunately Life doesn't let you cheat so easily. Wouldn't it be better to just pay attention and get an education?

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  • rickharris commented on BobbyArndt's instructable Clear Ice Tray - Easy & Inexpensive1 year ago
    Clear Ice Tray - Easy & Inexpensive

    Just boil the water before freezing

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  • rickharris commented on rickharris's instructable Making a really simple rabbit trap1 year ago
    Making a really simple rabbit trap

    To be honest I don't know, we don't get gophers in the UK. However as long as you use a suitable bait that they will go for it should work.A rabbits is not nimble enough, (or bright enough), to try to lift the door by pulling at the bottom. A gopher may be a bit brighter.It doesn't cost much so why not give it a go and let us know.

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  • Tesla Free Energy Air Circuit Design and Testing

    This isn't free in any sense other then your not paying for it. The transmitters, and the users of that transmitted energy would be very cross with you for blanking out their reception if you were to try to draw any amount of power from the air.Whilst on this type of "free" energy you can get 50 volts from your phone line. It's free in so far as you won't pay any more for tapping it;. - The phone company take a dim view though.

    This isn't free in any sense other then your not paying for it. The transmitters, and the users of that transmitted energy would be very cross with you for blanking out their reception if you were to try to draw any amount of power from the air.Whilst on this type of "free" energy you can get 50 volts from your phone line. It's free in so far as you won't pay any more for tapping it;. - The phone company take a dim view though.

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  • Make a spot welder WITH salvaged lithium cells

    I know you say this may not be such a good idea, but Lipo cells have a distinct dislike for providing huge currents. this is effectively a short circuit and my experience with RC models tells me this results in the cells bloating and quickly becoming useless if not actually igniting.

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  • How to Unlock Your Car in 30 Seconds

    1. Not all cars have the handy pull up knob, in fact none of the 3 cars we have in the UK do.2. On each of them this will result in the alarm setting off as soon as the door is opened. :-( 3. Easier to use a wire coat hanger with a loop bent in the end.

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