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by PhatFil
Mon Feb 17, 2020 3:43 am
Forum: General discussion
Topic: Cash Register w/ RPI
Replies: 3
Views: 170

Re: Cash Register w/ RPI

your right.. perhaps this might be more useful.. https://electronics.stackexchange.com/questions/251478/kicking-rj11-cash-drawer-via-pcs-serial-port looks like you need to supply 1a @ 24v for a few ms 200-500? just make sure you isolate your vulnerable pi from the 1a 24v power used to drive the draw...
by PhatFil
Mon Feb 17, 2020 2:49 am
Forum: General discussion
Topic: Cash Register w/ RPI
Replies: 3
Views: 170

Re: Cash Register w/ RPI

glancing over the amazon link the thing that stood out as relevant to your Q was " Drawer Kick Interface" highlighting that and searching for that term led to
https://www.beaglehardware.com/howtopro ... rawer.html

so it looks feasible with a 24v opto issolated interface perhaps?
by PhatFil
Sun Feb 16, 2020 7:19 pm
Forum: Automation, sensing and robotics
Topic: can i use a relay backwards ?
Replies: 4
Views: 313

Re: can i use a relay backwards ?

One point concerning safety . Make sure your existing control circuit and the new control circuit are fed from the same fused spur/isolator , so that in the event that there is a problem the same fused spur/isolator kills both circuits. Thanks, cant have too many pointers when it comes to safety.. ...
by PhatFil
Sun Feb 16, 2020 12:30 am
Forum: Automation, sensing and robotics
Topic: can i use a relay backwards ?
Replies: 4
Views: 313

can i use a relay backwards ?

What i mean is can i wire a relay with the common pin connected to the output to power a load within the capacity of the relay and have alternative inputs connected to NO and NC? This is for a diy smart central heating controller. The current control is via a wall thermostat which returns a mains 24...
by PhatFil
Sat Feb 15, 2020 7:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: raspberry gpio pin keyboard short-cuts
Replies: 2
Views: 202

Re: raspberry gpio pin keyboard short-cuts

the folk who build pi based game emulators will probably have a good handle on this.. google led me here https://theembeddedlab.com/tutorials/si ... pberry-pi/
by PhatFil
Fri Feb 14, 2020 6:10 am
Forum: General discussion
Topic: Wireless LED evacuation Project
Replies: 5
Views: 325

Re: Wireless LED evacuation Project

I think this is a school project or a "teach myself" project chaps.. A suggestion.... You could just host the mqtt broker on your pi and if you were to substitute cheaper esp8266 dev boards for the esp32s you could run public domain firmware like tasmota which has built in support for dht sensors an...
by PhatFil
Thu Feb 13, 2020 10:03 pm
Forum: Beginners
Topic: My raspbian doesn't run the micro-sd preinstalled noob
Replies: 2
Views: 130

Re: My raspbian doesn't run the micro-sd preinstalled noob

Probably the quickest route to a solution could be to check the raspbian downlaod page again and scroll down past where its suggests that you can use noobs and download the raspbian desktop zip file. also downlaod the balena etcher tool and install it. then use balena etcher to point at both the sd ...
by PhatFil
Thu Feb 13, 2020 5:46 pm
Forum: General discussion
Topic: Wireless LED evacuation Project
Replies: 5
Views: 325

Re: Wireless LED evacuation Project

hi use the code tags to share your code especially python as the indents are relevant to execution flow

Code: Select all

text like this retains formatting...
for the pi/python side i find these pages a good reference http://www.steves-internet-guide.com/pu ... tt-client/
by PhatFil
Thu Feb 13, 2020 2:29 pm
Forum: Troubleshooting
Topic: Battery question
Replies: 3
Views: 134

Re: Battery question

try using a separate psu or battery to drive your high draw motors most motor/pi examples you can google should describe this sort of set up.. run version 1 off a suitable mains psu, then when all mechanical quirks are resolved perhaps look at version 2 with a more battery friendly dev board instead...
by PhatFil
Wed Feb 12, 2020 12:21 am
Forum: Beginners
Topic: interfacing multiple components with Raspberry pi
Replies: 3
Views: 135

Re: interfacing multiple components with Raspberry pi

My approach as someone with a s/w only background would be to find basic example projects for each item of hardware you want to exploit and emulate each individually with your pi and h/w to ensure that they all work as expected and to begin to understand how each element works. Just remember to make...
by PhatFil
Fri Feb 07, 2020 8:59 pm
Forum: General discussion
Topic: different pi
Replies: 4
Views: 386

Re: different pi

W. H. Heydt wrote:
Fri Feb 07, 2020 3:25 am
PhatFil wrote:
Fri Feb 07, 2020 3:17 am
for Pi4 and 0 models a Micro hdmi adaptor 2x if you want 2x screens
hdmi lead/s
Pi0 uses miniHDMI, not micro.
whoops,, thnx for clarification and correction
by PhatFil
Fri Feb 07, 2020 3:17 am
Forum: General discussion
Topic: different pi
Replies: 4
Views: 386

Re: different pi

afaik in this case the "pro" tag relates to the kit or its contents rather than the Pi. The Pi4B has 3 variants 1Gb 2GB 4GB memory and thats it (for now?) Depending on your intentions the Kit bundles available can be good value.. but getting the os on a sd card in a kit isnt always the best option a...
by PhatFil
Fri Feb 07, 2020 2:26 am
Forum: Beginners
Topic: SD card full size: NEED HELP
Replies: 6
Views: 305

Re: SD card full size: NEED HELP

Have i misunderstood? Are you running a system in 1gb of space on a 32gb card? If its a raspbian system? have you executed the command "sudo raspi-config" at the command line/$prompt of a terminal session? Or have you filled up the card with files? if the latter get a usb drive and move some unwante...
by PhatFil
Fri Feb 07, 2020 1:55 am
Forum: General discussion
Topic: Always Up Settings for Pi3
Replies: 5
Views: 407

Re: Always Up Settings for Pi3

have a google on the subject "Network WatchDog Pi" for a way to help maintain a pi nework servers up time.
by PhatFil
Fri Feb 07, 2020 1:49 am
Forum: Beginners
Topic: SD card full size: NEED HELP
Replies: 6
Views: 305

Re: SD card full size: NEED HELP

Sounds as if your have an OLD NOOBS or PINN installer card? if so just follow the guidelins to download the os of your choice (raspbian?) and the balena etcher program. install/run etcher and point it at your sd card and the downloaded zip file. use this sd card to start your raspberry system up and...
by PhatFil
Fri Feb 07, 2020 1:35 am
Forum: Networking and servers
Topic: Ethernet Cable For Web Server Setup on Router
Replies: 4
Views: 224

Re: Ethernet Cable For Web Server Setup on Router

Just get a suitably long Cat5e or Cat6 ethernet cable. patch cables are generally too short for everyday practical use at 50cm or less, And crossover cables have the rx/tx lines hard switched, and while most modern h/w automatically detects/corrects this its best not to use these.. If paying more fo...
by PhatFil
Fri Feb 07, 2020 1:14 am
Forum: Other projects
Topic: A home-brew lap counter/recorder/calculator
Replies: 26
Views: 2220

Re: A home-brew lap counter/recorder/calculator

or pick up a cheap coin cell powered 433mhz button controller, and use your pi to receive the button code and host a web page with all the metrics/data/forcasts you want to display and use your phone or puter to view.. button ideas https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_202002...
by PhatFil
Fri Feb 07, 2020 12:59 am
Forum: Beginners
Topic: Starting Raspbian
Replies: 9
Views: 355

Re: Starting Raspbian

Yes follow the recommended guide, something like.. 1) download the raspbian zip file and balena etcher 2) install/start balena etcher and point it at the zipfile and your target sd card 3) remove and reinsert the sd card in the computer used to flash it, open the boot partition and save the ssh file...
by PhatFil
Thu Feb 06, 2020 8:02 pm
Forum: Camera board
Topic: Pi Zero case for outdoor
Replies: 5
Views: 419

Re: Pi Zero case for outdoor

Dummy or non working camera housings can make good donor bodies..
by PhatFil
Thu Feb 06, 2020 7:30 pm
Forum: Assistive technology and accessibility
Topic: Sound activation device
Replies: 6
Views: 2925

Re: Sound activation device

Hi, Thank you for the replies. The clapper idea is great but it is only concerned from changing from one state to another. I need to find a method to incorporate multiple sounds as one function. Tbh i didnt chase down the link to the detail but it does contain the code (python) to respond to a clap...
by PhatFil
Thu Feb 06, 2020 6:00 pm
Forum: HATs and other add-ons
Topic: Detecting low voltage signal
Replies: 4
Views: 585

Re: Detecting low voltage signal

No sorry if i wasn't clear, just use some tape or opaque hot glue (blutac?) to mask off ambient light and light from other leds so your light sensitive resistor can only be activated by the led it is monitoring. an optocoupler is a combination of a light source and a light sensitive component .. you...
by PhatFil
Wed Feb 05, 2020 11:53 pm
Forum: Graphics, sound and multimedia
Topic: control audio via remote control
Replies: 1
Views: 269

Re: control audio via remote control

Im pretty sure you will find RC forums full of useful information on this subject a pi on its own can produce an acceptable audio signal over gpio but for numerous channels some not necessarily expensive additional h/w will be required. Check out this h/w https://www.aliexpress.com/item/32764113914....
by PhatFil
Wed Feb 05, 2020 4:31 pm
Forum: HATs and other add-ons
Topic: Detecting low voltage signal
Replies: 4
Views: 585

Re: Detecting low voltage signal

Do you need to see the leds as well as have your pi react to them ? there are unknown implications of drawing extra current to drive a transistor as you may over draw on the led supply and burn out something in your black box circuit. a light reactive resistor masked off so it can only react to the ...
by PhatFil
Tue Feb 04, 2020 10:14 pm
Forum: Troubleshooting
Topic: RPi Zero W crashing at random
Replies: 10
Views: 1254

Re: RPi Zero W crashing at random

If you have Pi-0-w-A and Pi-0-w-B (2 x Pi-0-w) and SD card-A with a Pi system on it, If SDcard A Crashes when in Pi-0-W-A But Boots and runs ok when placed in Pi-0-w-B ? does the main chip also get VERY HOT in Pi-0-w-A too?? Take a very close look at Pi-0-w-A looking for any burnt out components or ...
by PhatFil
Tue Feb 04, 2020 4:09 pm
Forum: Troubleshooting
Topic: RPi Zero W crashing at random
Replies: 10
Views: 1254

Re: RPi Zero W crashing at random

So now your system isnt starting up completely without crashing within seconds preventing you from investigating on the live system? My aproach would be to pull the sd card and plug it into another computer to read it. If you have windows computers you will need a file system driver to enable your p...

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