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by boyoh
Fri Sep 20, 2019 10:31 am
Forum: Beginners
Topic: Leak sensor too sensitive
Replies: 13
Views: 218

Re: Leak sensor too sensitive

3.3v+-----(10k)---GPIO i/P---( c e)------0v- 5v+-----/1m P/S /--(1k)-------( b )--- (1mP/S)-0v— / 1m P/S / = Probes & Pre/set This circuit should give a Active 0( low} to I/P Give this circuit a try Might work might not Put compensating Preset across probes Put sensitivity Preset from base to 0v- Th...
by boyoh
Tue Sep 17, 2019 10:15 pm
Forum: Beginners
Topic: GPIO pin to trigger 555 astable circuit
Replies: 4
Views: 98

Re: GPIO pin to trigger 555 astable circuit

Good old triple 5, and not a Python in sight The triple 5 was designed long before The RaspberryPi, one of the components in Learning basic electronics, At least this Poster is going the right way to learn electronics At least he will be a circuit builder and a coder So keep building and coding, The...
by boyoh
Tue Sep 17, 2019 9:42 pm
Forum: Beginners
Topic: GPIO pin to trigger 555 astable circuit
Replies: 4
Views: 98

Re: GPIO pin to trigger 555 astable circuit

This could be done by letting the 555 be powered While the system is active, and only switching The flashing LED using a transistor from A GPIO controlled out / put, Only the LED Low current will be switching on and off Design you flash rate to suit 555 / Pin3-----(470r )----( LED)-----( c e )----0v...
by boyoh
Fri Sep 13, 2019 4:07 pm
Forum: Beginners
Topic: What is purpose of powering a breadboard's power rail but not used
Replies: 6
Views: 222

Re: What is purpose of powering a breadboard's power rail but not used

I’m giving you a clue, the breadboard was invented before the RaspberryPi and computers. Designers used breadboards to design circuits A breadboard without a Positive rail was not Much use, You are only using the breadboard To interface the Pi . Start building some practical Circuits on the breadboa...
by boyoh
Thu Sep 12, 2019 1:08 pm
Forum: Beginners
Topic: Relay - can it be used in reverse (signal microcontroller) ?
Replies: 14
Views: 558

Re: Relay - can it be used in reverse (signal microcontroller) ?

I was hoping someone with common sense Would understand that an electrician would Be able to make safe connection to the existing Lighting circuit for him to fit the power adapter It then would be solid state no relays, In my time working as an electrician I have learnt that, unfortunately, common ...
by boyoh
Thu Sep 12, 2019 8:36 am
Forum: Beginners
Topic: Relay - can it be used in reverse (signal microcontroller) ?
Replies: 14
Views: 558

Re: Relay - can it be used in reverse (signal microcontroller) ?

One safe way to interface the light to give the Pi a input, would use a 5vdc power adapter On the lighting circuit... Except very few lighting circuits have provision to connect power adapters -- certainly UK lighting circuits should not normally have 13A sockets (because they cannot supply 13A). I...
by boyoh
Wed Sep 11, 2019 7:19 pm
Forum: Beginners
Topic: Relay - can it be used in reverse (signal microcontroller) ?
Replies: 14
Views: 558

Re: Relay - can it be used in reverse (signal microcontroller) ?

Witch ever way you use to implement this
Project, means connecting to the AC mains
Other than using a light sensor circuit
The AC mains part of the project
Must be done by a electrician ,

Regards BoyOh
by boyoh
Wed Sep 11, 2019 10:11 am
Forum: Beginners
Topic: Relay - can it be used in reverse (signal microcontroller) ?
Replies: 14
Views: 558

Re: Relay - can it be used in reverse (signal microcontroller) ?

One safe way to interface the light to give the Pi a input, would use a 5vdc power adapter On the lighting circuit. Then use the 5vdc to Give a 3.3v Pi input using a voltage levelling Circuit , You could use a potential divider Or opto isolator or a transistor, the choice Is yours Regards BoyOh
by boyoh
Mon Sep 09, 2019 12:10 pm
Forum: Beginners
Topic: laser range finder accuracy
Replies: 8
Views: 238

Re: laser range finder accuracy

One point to remember when designing War Game
Is if you want to shoot you have to be prepared to
Be SHOT AT, this evolves being able to detect
The oncoming missile and destroy it, Or else you
Won’t last long on the battle field

Regards BoyOh
by boyoh
Mon Sep 09, 2019 8:56 am
Forum: Beginners
Topic: laser range finder accuracy
Replies: 8
Views: 238

Re: laser range finder accuracy

What was the purpose of your first post, When in your last post you had it worked all out,. A detailed circuit of your design electronics Will be nice to see. Remember the RaspberryPi Is not PLUG & Play, Writing the code might Be easy for you , but implementing it into a working Project will be very...
by boyoh
Sun Sep 08, 2019 10:06 pm
Forum: Beginners
Topic: laser range finder accuracy
Replies: 8
Views: 238

Re: laser range finder accuracy

I think the lack of understanding of electronics will
Will be the drawback for you on this project
1 How will you lock the Laser on to the target
2 How will you set the Coordinates between
3 The gun and the target to implement them
4 In to the system to get the target position .
Regards BoyOh.
by boyoh
Wed Sep 04, 2019 10:26 am
Forum: Beginners
Topic: Raspberry Pi ** Sold over 25million units **
Replies: 19
Views: 714

Re: Raspberry Pi ** Sold over 25million units **

What will the end product be 25million programmers, 5.000 Electronics Engineers Well, the aim of the Pi is to encourage programmers (except they call it "coding" now).. Maybe not 25 million, but tens of thousands would be good. I totally agree with what you are saying. They Are over stretching the ...
by boyoh
Wed Sep 04, 2019 9:00 am
Forum: Beginners
Topic: Raspberry Pi ** Sold over 25million units **
Replies: 19
Views: 714

Re: Raspberry Pi ** Sold over 25million units **

What will the end product be 25million programmers, 5.000 Electronics Engineers

Regards BoyOh
by boyoh
Tue Sep 03, 2019 7:29 pm
Forum: Beginners
Topic: Complete beginner - Garage Door Dedection
Replies: 12
Views: 404

Re: Complete beginner - Garage Door Dedection

Sitting in your office .then you receive a e-mail
Saying your garage door is open. Can you close
The door from your office, IF not what is the
Point of your project , More thought is to go
Into this project.
Regards BoyOh
by boyoh
Tue Sep 03, 2019 2:41 pm
Forum: Beginners
Topic: GPIO pull up resistors.
Replies: 4
Views: 154

Re: GPIO pull up resistors.

A GPIO in/put with no internal or external Resistance set, As a very high impedance (Resistance) called Floating , it will not Sink or source a signal, For it to work you Must set it to to a working impedance (resistance) to do this you set the Internal Resistance or use a external 10k resistor.. To...
by boyoh
Fri Aug 30, 2019 11:01 am
Forum: Beginners
Topic: what is a good book to start learning python GPIO contros
Replies: 10
Views: 400

Re: what is a good book to start learning python GPIO contros

I am proficient at other programming Languages. I did 1 Python class in college but its been many years. I just want to read up on GPIO programming. I know there isn't a lot to it, but, but I would rather read a general overview of working with GPIO instead f just reading the steps to complete othe...
by boyoh
Mon Aug 26, 2019 3:07 pm
Forum: Beginners
Topic: what is a good book to start learning python GPIO contros
Replies: 10
Views: 400

Re: what is a good book to start learning python GPIO contros

I still can’t grasp your logic of your Post on what You want to know, You are proficient in software You now say you are proficient in Electronics, So What part of the RaspberryPi you don’t understand and want information on, You said you are a are Radio am, So you should understand GPIOs Impedance ...
by boyoh
Sat Aug 24, 2019 9:56 pm
Forum: Beginners
Topic: what is a good book to start learning python GPIO contros
Replies: 10
Views: 400

Re: what is a good book to start learning python GPIO contros

Now you seem to be very proficient in software
Now you want to use the software to tell Pi how
To interface with the GPIOs, You will need to understand basic electronics to do this. Being
Working in IT should be very easy for you to
Learn

Regards BoyOh
by boyoh
Wed Aug 21, 2019 11:21 am
Forum: Beginners
Topic: IR laser and reciever
Replies: 3
Views: 618

Re: IR laser and reciever

I can’t see any problem with this project if you Use IR coded transmitters. You could have a Battle field full of Tanks all set at different codes The target area could have a IR coded receiver. Regards BoyOh To make this project simpler, you could fit a Cheep type pencil laser pointer in the barre...
by boyoh
Wed Aug 21, 2019 8:57 am
Forum: Beginners
Topic: Charging Indicator
Replies: 4
Views: 888

Re: Charging Indicator

For this project you could use a Zener Diode
To monitor the charge voltage, use a diode to
Stope the feed back from the battery,
This is only a Idea to point you in the right
direcion

Regards BoyOh
by boyoh
Mon Aug 19, 2019 8:37 am
Forum: Beginners
Topic: Laser Sensor Plate Counter
Replies: 3
Views: 715

Re: Laser Sensor Plate Counter

Can this project be done by recording the weight of
Bar bells
Regards BoyOh
by boyoh
Sun Aug 18, 2019 3:48 pm
Forum: Beginners
Topic: IR laser and reciever
Replies: 3
Views: 618

Re: IR laser and reciever

I can’t see any problem with this project if you
Use IR coded transmitters. You could have a
Battle field full of Tanks all set at different codes
The target area could have a IR coded receiver.

Regards BoyOh
by boyoh
Sat Aug 17, 2019 10:33 pm
Forum: Beginners
Topic: Leak sensor
Replies: 15
Views: 1649

Re: Leak sensor

Okay if I should go the transistor route what do I buy? One person said 2n2222. I don't know much about choosing transistors. I noticed I can get a boat load of just these transistors or an assortment of transistors for about the same price. Are the assortment packages worth it or should I just get...
by boyoh
Sat Aug 17, 2019 12:25 pm
Forum: Beginners
Topic: Leak sensor
Replies: 15
Views: 1649

Re: Leak sensor

Thanks for the help. I gave my system a test and found if I used only a little water it couldn't sink enough to pull the input low. If I used about an inch of water then it could pull the input low. I changed to active high and that would work with just a little water. So I think I will try using t...
by boyoh
Fri Aug 16, 2019 11:31 pm
Forum: Beginners
Topic: Leak sensor
Replies: 15
Views: 1649

Re: Leak sensor

A GPIO in/put with no internal or external Resistance set, As a very high impedance (Resistance) called Floating , it will not Sink or source a signal, For it to work you Must set it to to a working impedance (resistance) to do this you set the Internal Resistance or use a external 10k resistor.. To...

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