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by PhatFil
Tue Feb 25, 2020 7:02 am
Forum: Beginners
Topic: How to transmit data trough an access point without protocol
Replies: 11
Views: 439

Re: How to transmit data trough an access point without protocol

you will probably have to employ some protocols, but you can probably not need to get too involved with the mechanics unless you want to mqtt would probably be the easiest to implement and use. you would only need to install a broker and some tools with a couple of apt install commands. Using a pyth...
by PhatFil
Sat Feb 22, 2020 4:32 pm
Forum: General discussion
Topic: Creating a light timer
Replies: 1
Views: 197

Re: Creating a light timer

To avoid the very real risks of connecting mains power to your pi may i suggest you consider looking at reprogramming an off the shelf smart switch to respond to your Pi rather than the manufacturers server and phone app. The Tasmota firmware is compatible with a number of commercial devices off the...
by PhatFil
Fri Feb 21, 2020 11:55 am
Forum: General discussion
Topic: Of canaries and backdoors
Replies: 15
Views: 1303

Re: Of canaries and backdoors

Not paranoid, just rude, what makes you think any backdoors exist? have you monitored suspicious traffic? if so where is the evidence.. Thats how a rational person would start such a conversation. "Hey I found this suspicious traffic from my pi any ideas??" for example if i asked loudly "how many ch...
by PhatFil
Fri Feb 21, 2020 10:46 am
Forum: Beginners
Topic: IoT WebServer
Replies: 6
Views: 308

Re: IoT WebServer

If your collecting masses of data like temperatures every few seconds for real time analysis and reaction for pid controlled heating for example, long term archiving of every record may not be ideal, and rather than working on complex selective deletion of redundant data perhaps you may want to cons...
by PhatFil
Fri Feb 21, 2020 8:58 am
Forum: General discussion
Topic: Pi Zero W VT100 Terminal
Replies: 5
Views: 529

Re: Pi Zero W VT100 Terminal

forgive the question but have you switched the com lines so Rx on the Pi connects to Tx on your host device and Tx connects to Rx? I only ask as afaik VT100 is one of the basic standard terminal types that ALL emulators should be able to mimic and decode the control chars and data. tty is the termin...
by PhatFil
Thu Feb 20, 2020 12:50 am
Forum: General discussion
Topic: PI Power - Commercial battery source
Replies: 28
Views: 1729

Re: PI Power - Commercial battery source

Posted in wrong thread in error..
by PhatFil
Tue Feb 18, 2020 1:31 am
Forum: Off topic discussion
Topic: My kid is using a Raspberry Pi - should I call the police???
Replies: 33
Views: 4301

Re: My kid is using a Raspberry Pi - should I call the police???

the bottom left logo looked a bit suspect..
by PhatFil
Tue Feb 18, 2020 1:12 am
Forum: Off topic discussion
Topic: My kid is using a Raspberry Pi - should I call the police???
Replies: 33
Views: 4301

Re: My kid is using a Raspberry Pi - should I call the police???

Hope its not a joke.. as i have sent an email requesting copies :twisted:
by PhatFil
Tue Feb 18, 2020 12:23 am
Forum: Troubleshooting
Topic: RPi Zero 4 Channel Relay ?
Replies: 3
Views: 211

Re: RPi Zero 4 Channel Relay ?

try something like https://www.amazon.co.uk/Outlets-AOFO-Protector-Individual-Assistant/dp/B07MZSH3CF/ref=pd_aw_sbs_60_5/260-0050849-9113507?_encoding=UTF8&pd_rd_i=B07MZSH3CF&pd_rd_r=88d3d246-a842-4b62-8bee-0fcb87ef2a9a&pd_rd_w=5Huyx&pd_rd_wg=mCubq&pf_rd_p=15216146-4434-47f5-99d9-56240c85bf4d&pf_rd_...
by PhatFil
Mon Feb 17, 2020 11:45 pm
Forum: General discussion
Topic: Remote power button or reset button?
Replies: 10
Views: 660

Re: Remote power button or reset button?

for a hard reset and avoiding most complications of mains power you could look at one of the plug inline smart switch options that can be reprogrammed with open source firmware to remove reliance on commercial possibly not free or alive forever servers and phone apps.. an OTA rewrite is even possibl...
by PhatFil
Mon Feb 17, 2020 4:31 am
Forum: Beginners
Topic: Switching from Arduino to RPi, what parts to buy
Replies: 5
Views: 395

Re: Switching from Arduino to RPi, what parts to buy

I might need I2C and maybe single wire transfer so can you please send me a link for what type of level shifter I should buy your pretty safe buying from the far east portals, these are very cheap and dont use components worth counterfeiting so while you may get a few duds in a batch the fact you c...
by PhatFil
Mon Feb 17, 2020 4:12 am
Forum: General discussion
Topic: Remote power button or reset button?
Replies: 10
Views: 660

Re: Remote power button or reset button?

with a similar set up as @jbudd above (mosquitto/nodered) and my favorite $10 chinese bargain a tasmota-ised sonoff rf bridge.. https://github.com/arendst/Tasmota/wiki/Sonoff-RF-Bridge-433 which echos any 433mhz RF signal it can decode as a mqtt topic/payload. This allows the use of many cheap butto...
by PhatFil
Mon Feb 17, 2020 3:43 am
Forum: General discussion
Topic: Cash Register w/ RPI
Replies: 3
Views: 218

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: 218

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: 397

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: 397

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: 291

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: 414

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: 188

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: 414

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: 210

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: 191

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: 456

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: 456

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: 384

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...

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