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by boyoh
Mon Jun 17, 2019 8:03 pm
Forum: Beginners
Topic: Programming with Function Block or Ladder Logic
Replies: 3
Views: 126

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: 126

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: 181

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: 303

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: 304

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: 108

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: 288

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: 224

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: 291

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: 424

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: 424

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: 233

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: 1819

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: 1819

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: 1819

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: 1819

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: 1819

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...
by boyoh
Fri Apr 19, 2019 1:23 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1819

Re: How to calculate resistors...

This might be useful for you
Ohms Law 1.jpg
Ohms Law 1.jpg (154.69 KiB) Viewed 459 times
by boyoh
Fri Apr 19, 2019 9:39 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1819

Re: How to calculate resistors...

I find your mode of thinking very hard to grasp. One minit You are a believer, the next a disbeliever, you challenge all you are told. In electronics you have to be very open minded And sometimes take things for granted, we know that Volts and current are the flow of ELECTRONS, but you can’t See the...
by boyoh
Thu Apr 18, 2019 9:38 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1819

Re: How to calculate resistors...

My advice is put the Pi back in it’s box, Just do some basic Electronics on a breadboard , get a 0 /12cdc 4a power supply Get a selection of Led’s selection of resistors Study OHMs Law You will need a Multimeter to do your checks Then you will know How to Interface with the Pi, Regards BoyOh Retire...
by boyoh
Thu Apr 18, 2019 4:46 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 68
Views: 1819

Re: How to calculate resistors...

My advice is put the Pi back in it’s box, Just do some basic Electronics on a breadboard , get a 0 /12cdc 4a power supply Get a selection of Led’s selection of resistors Study OHMs Law You will need a Multimeter to do your checks Then you will know How to Interface with the Pi, Regards BoyOh Retired...
by boyoh
Tue Apr 16, 2019 12:54 pm
Forum: Beginners
Topic: Need digital dash for dune buggy engine...
Replies: 6
Views: 246

Re: Newbie project/question??

Hello, fellow members. I'm in the process of building a custom dune buggy powered by an quad engine. v Are there any components available for me to program a customized digital dash. I would like for it to display the speed, rpm, coolant temp and also fuel tank level. It would also be pretty cool f...
by boyoh
Sun Apr 14, 2019 8:52 am
Forum: Beginners
Topic: Ultrasonic sensor and 2 leds on a bread board
Replies: 5
Views: 194

Re: Ultrasonic sensor and 2 leds on a bread board

TO give a correct answerer to your connections, it would be better To draw your circuit out, and post it, Photos on breadboards can Be very confusing. Regards BoyOh The problem with a diagram is it won't show the sort of error that the pictures show here, were the resistor and wire are indifferent ...
by boyoh
Sat Apr 13, 2019 10:32 pm
Forum: Beginners
Topic: Ultrasonic sensor and 2 leds on a bread board
Replies: 5
Views: 194

Re: Ultrasonic sensor and 2 leds on a bread board

Hi i need to connect an ultrasonic sensor with two leds on a tiny breadboard I did the circuit and the sensor is working fine but the leds aren't, is there a problem with the circuit? Here are photos of the circuit http://imgur.com/a/PrYEjGr TO give a correct answerer to your connections, it would ...
by boyoh
Wed Apr 10, 2019 12:58 pm
Forum: Off topic discussion
Topic: Learning Electronics
Replies: 56
Views: 2809

Re: Learning Electronics

Rpdom rpdom I admire your powers of observation, seeing it is a 26 Ribbon Cable and not a 40 Ribbon , and spotting it is the older Pi Model..This was due to making the board in 2012. That should have rang a bell in that great mind of yours At least your have increased your post’s numbers Regards Bo...

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