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by boyoh
Wed Jun 26, 2019 11:07 am
Forum: Beginners
Topic: What projects I can make with Raspberry Pi 3
Replies: 6
Views: 135

Re: What projects I can make with Raspberry Pi 3

Hello, I am computer science student. During my insternship I will code Raspberry. Firstly I do not want to make projects like; line following cars, rain alert or smart door locking. I think they more like electrical things. But I want more coding, I want to practice C++/C on more real projects. Pl...
by boyoh
Wed Jun 26, 2019 9:02 am
Forum: Beginners
Topic: What projects I can make with Raspberry Pi 3
Replies: 6
Views: 135

Re: What projects I can make with Raspberry Pi 3

Hello, I am computer science student. During my insternship I will code Raspberry. Firstly I do not want to make projects like; line following cars, rain alert or smart door locking. I think they more like electrical things. But I want more coding, I want to practice C++/C on more real projects. Pl...
by boyoh
Tue Jun 25, 2019 9:27 am
Forum: Beginners
Topic: Solar tracker info
Replies: 10
Views: 1472

Re: Solar tracker info

My own interest would be tracking the sun in order to orient a reflector onto a particularly area of my garden that is devoid of sun except in the very late afternoon in the summer. If anyone comes across such a thing please do let me know. :) You could use a stepper motor to move A sun reflector i...
by boyoh
Mon Jun 24, 2019 7:40 pm
Forum: Beginners
Topic: Solar tracker info
Replies: 10
Views: 1472

Re: Solar tracker info

I’m a bit confused with your Solar project You said you have no light sensors, How Are you tracking the sun light to position Your Solar panels to charge your batteries If you are using mains power to control The system, what is the object of your Project, If you are generating surplus power Are you...
by boyoh
Sat Jun 22, 2019 10:06 pm
Forum: Beginners
Topic: How to make the GPIO connections more robust
Replies: 10
Views: 926

Re: How to make the GPIO connections more robust

So is there a way I can make the GPIO pins more strongly secured by the pi? More secure than what? What are you currently doing? And is there any way I can prevent the pi from getting burnt or fused? Don't overload any outputs, operate inputs within specifications, don't short things. Also, I was r...
by boyoh
Sat Jun 22, 2019 8:14 am
Forum: Beginners
Topic: How to make the GPIO connections more robust
Replies: 10
Views: 926

Re: How to make the GPIO connections more robust

You could make your own interface board
Using Vero board, as I have don, also fitted
Opto Isolators for signal isolating and
Voltage levelling, Just a Idea for you
Regards BoyOh,
Pi Board  IF 010.jpg
Pi Board IF 010.jpg (59.8 KiB) Viewed 784 times
by boyoh
Fri Jun 21, 2019 4:36 pm
Forum: Beginners
Topic: How to make the GPIO connections more robust
Replies: 10
Views: 926

Re: How to make the GPIO connections more robust

First you must understand the Raspberry Pi
Is not Plug & Play, So more information is
Needed of how you are interfacing with
The Pi GPIO connections, a circuit drawing
Will be very helpful to give you some
Advice, Do not work on mains voltage
Unless you know what you are doing.
Regards BoyOh
by boyoh
Wed Jun 19, 2019 10:41 am
Forum: Beginners
Topic: 3v3 Relay with external power supply
Replies: 13
Views: 316

Re: 3v3 Relay with external power supply

If the relay as the option of 3v/5v feed i would Use the 5v option. There is a output impedance level between the 3vGPIO level And the 3.3v rail level, the 3.3v rail is a lower Level impedance more driving power, You could use the 3.3v rail to see it will Operate the relay your choice if it works 5v...
by boyoh
Mon Jun 17, 2019 8:03 pm
Forum: Beginners
Topic: Programming with Function Block or Ladder Logic
Replies: 3
Views: 169

Re: Programming with Function Block or Ladder Logic

Slomersloop wrote:
Sun Jun 16, 2019 3:26 am
Nm, found my solution: http://comfiletech.com/cb210/
Down load a PLC ladder program simulator
Regards BoyOh
by boyoh
Mon Jun 17, 2019 7:57 pm
Forum: Beginners
Topic: Programming with Function Block or Ladder Logic
Replies: 3
Views: 169

Re: Programming with Function Block or Ladder Logic

PLC logic ladder controllers are used in many Industrial applications, usually termed as Sequencers, When designing the Ladder Program it must be Fail To Safe, A good Understanding of industrial sensors is needed To interface with the PLC In /Puts. And a good Understanding of the PLC Out / Puts inte...
by boyoh
Mon Jun 17, 2019 5:01 pm
Forum: Staffroom, classroom and projects
Topic: art project with a traffic light
Replies: 4
Views: 259

Re: art project with a traffic light

“I am not an electronics noob, but I am a PI noob “ First the Pi is not plug & play, A start on Learning some basic electronics is your First move. Script / and programming is Only useful if it as something to do and Control, Controlling traffic light comes Under understanding Combinational Logic Do...
by boyoh
Thu Jun 13, 2019 7:06 pm
Forum: Beginners
Topic: How do you name your Pies?
Replies: 14
Views: 411

Re: How do you name your Pies?

Label Rpi / 1 RED

“ Rpi / 2 yellow

“ Rpi / 3 Blue

by boyoh
Fri May 24, 2019 10:39 pm
Forum: Beginners
Topic: Raspberry Pi for a Complete Beginner.
Replies: 4
Views: 329

Re: Raspberry Pi for a Complete Beginner.

Hello everyone,, I've jumped in an bought myself a Raspberry Pi B+ and I'm hoping to have a go at learning to do some programming. I have pretty much minimal experience doing any programming, I used HTML several years ago to build some basic websites, and have since used Matlab at uni but not very ...
by boyoh
Wed May 22, 2019 4:36 pm
Forum: Beginners
Topic: PT100 Temperature sensor
Replies: 3
Views: 118

Re: PT100 Temperature sensor

Im new to this and at the beginning of a project, I currently have a machine that uses a PT100 to measure temperature, tempature range 0-300°C I would like to leave the current control circuit in place and piggy back the signal from the PT100 for our own project, Can someone point me in the right d...
by boyoh
Wed May 08, 2019 8:20 pm
Forum: Beginners
Topic: Raspberry pi GPIO.low
Replies: 7
Views: 295

Re: Raspberry pi GPIO.low

Pi 5v+Rail------------( R ) ---------Relay IN--------(C Transistor E )---------0v- GPIO O/P-----------(1k)------------------------------(B Transistor ) Pi 5v+Rail---------------( + Relay- )----------------0v- Transistor 2n2222 Resistor 2k For the relay to switch on it will need a Active 0(low) For t...
by boyoh
Wed May 08, 2019 9:17 am
Forum: Beginners
Topic: Leds attached to GPIO
Replies: 7
Views: 238

Re: Leds attached to GPIO

Leds.jpegI want to attach 8 white leds to my Raspberry Pi zero. My schema is like the attachment (lines have to be closed). This way it's a parallel/serial circuit. Can I attach the 0V to Gnd and the 5V to 1 GPIO? I thought this will take about 22mA, but maybe I'm wrong. Is there a better solution ...
by boyoh
Sun May 05, 2019 9:29 am
Forum: Beginners
Topic: Multiple LEDs - series, parallel, both?
Replies: 6
Views: 298

Re: Multiple LEDs - series, parallel, both?

Oh - and the resistors in the schematic at the bottom - are just random values - I would still be interested in keeping resistance as high as possible - so long as the LEDs are bright enough. In reality the LEDs on the left (in the pair) are on an RJ45 socket and the LEDs on the right are on anothe...
by boyoh
Fri May 03, 2019 10:09 am
Forum: Beginners
Topic: How to write a software to control the pi board
Replies: 9
Views: 432

Re: How to write a software to control the pi board

You are getting a lot of advice on the soft ware side of the
Project, This you seem to understand but programs “script”
is only usfull if it as hardware to control
All the hardware you want to fit on the Drone will add weight
To It, have you taken this into consideration,

Regards BoyOh
by boyoh
Thu May 02, 2019 1:28 pm
Forum: Beginners
Topic: How to write a software to control the pi board
Replies: 9
Views: 432

Re: How to write a software to control the pi board

First you must understand the Raspberry Pi is not PLUG & PLAY To interface all your Drone sensors with the Pi, you will need A understanding of basic electronics. This will then give you a Better understanding of how to connect the sensors to the PI GPIOs, there are different voltage and current lev...
by boyoh
Fri Apr 26, 2019 4:43 pm
Forum: Beginners
Topic: Wiring up buttons to the GPIO
Replies: 4
Views: 242

Re: Wiring up buttons to the GPIO

The reason for connecting Pull up & Pull down resistors to a Pi GPIO I/P, is due to the GPIO I/P very high impedance( resistance) In it’s unconnected state (Floating) it will not source or sink a digital active 1( high) or a active 0( low), You are given the option To set it to your circuit requirem...
by boyoh
Wed Apr 24, 2019 10:51 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1843

Re: How to calculate resistors...

That makes sense - and now I understand that much better than at the beginning of this thread. :) I would have been in trouble had I stayed with that rule of thumb on my project - running LEDs at 20mA - plus all the other components in terms of the RPi. I mean - the LEDs would have been safe but th...
by boyoh
Mon Apr 22, 2019 2:51 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1843

Re: How to calculate resistors...

ameador 1 You have just been given very good advice by “ hippy “ nobody Could have give you any better advice, Just don’t be to critical With your cancelations, If I had been very critical in the past The project would have never got off the design stage, If it worked Within its limits that was all ...
by boyoh
Sat Apr 20, 2019 9:11 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1843

Re: How to calculate resistors...

Yes you are correct; I have the full set of the Engineer’s Mini-Notebook By Forrest M. Mims. Very good circuits in them, If as you said you Had them in the 80s It don’t seem as if you learnt much from them by The questions you are asking, I got them in the 80s from Tandy’s UK Built many circuits in...
by boyoh
Fri Apr 19, 2019 9:01 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1843

Re: How to calculate resistors...

Hey boyoh, Those sheets you attached - where are those from? They look a lot like the pages from some electronics books I had bought from Radio Shack back in the late 80's - Just curious... Yes you are correct; I have the full set of the Engineer’s Mini-Notebook By Forrest M. Mims. Very good circui...
by boyoh
Fri Apr 19, 2019 8:53 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1843

Re: How to calculate resistors...

ameador1 wrote:
Fri Apr 19, 2019 3:50 pm
Hey boyoh,

Those sheets you attached - where are those from? They look a lot like the pages from some electronics books I had bought from Radio Shack back in the late 80's - Just curious...

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