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by pcmanbob
Thu Oct 21, 2021 2:13 pm
Forum: Automation, sensing and robotics
Topic: Need help attaching a 12v 10w heater to the PI
Replies: 1
Views: 96

Re: Need help attaching a 12v 10w heater to the PI

Hi. You simply need a transistor driver circuit to do this, some thing like a IRF520 mosfet will do , its a bit over kill for your use, but you can get ready made pcd's which just need connecting to the pi, PSU & heater. https://www.ebay.co.uk/itm/224298420837?_trkparms=ispr%3D1&hash=item343...
by pcmanbob
Thu Oct 21, 2021 1:55 pm
Forum: Beginners
Topic: 2 wire sensor - Beginner.
Replies: 2
Views: 110

Re: 2 wire sensor - Beginner.

So the thermocouple you have is not a 1-wired device like the DS18B20, so you cant just hook it up directly to the pi gpio as you can with a 1-wire device, You will need an interface board to allow you to read the thermocouple from the pi gpio, this is one I found from the Pi Hut in the UK.... https...
by pcmanbob
Thu Oct 21, 2021 8:48 am
Forum: Troubleshooting
Topic: Pihole Raspberry 2 not powering up automatically after a power outage.
Replies: 6
Views: 181

Re: Pihole Raspberry 2 not powering up automatically after a power outage.

capitanharlock wrote:
Thu Oct 21, 2021 8:14 am
I guess I installed a remote control (infrared), that has a power button, maybe this is the problem... :(
Most probably then ;)

As I said no power button install on any pi when you buy it , and they all just boot on connection of the 5V power.
by pcmanbob
Wed Oct 20, 2021 7:08 pm
Forum: Automation, sensing and robotics
Topic: Interfacing with inline fan.
Replies: 11
Views: 485

Re: Interfacing with inline fan.

I will try and explain simply how the circuit works. First off lets remember that if you apply 10v to the blue wire the fan runs, if you apply 0V to the blue wire the fan stops, so with that in mind and looking at the diagram. https://i.imgur.com/ZnX9tVk.jpg So if the pi is outputting a low on gpio ...
by pcmanbob
Wed Oct 20, 2021 5:54 pm
Forum: Troubleshooting
Topic: Pihole Raspberry 2 not powering up automatically after a power outage.
Replies: 6
Views: 181

Re: Pihole Raspberry 2 not powering up automatically after a power outage.

No pi comes with a power button,

So it might help us help you if you tell us what power button you have installed on your pi.
by pcmanbob
Wed Oct 20, 2021 9:11 am
Forum: Python
Topic: ADS1115 ADC with Raspberry Pi 3
Replies: 2
Views: 96

Re: ADS1115 ADC with Raspberry Pi 3

Hi. So looking at the linked web page the install was written for use with python , but you are trying to use python 3 to run the set up , if you followed the instructions then you would have downloaded everything for python not python 3. So either run the commend using python or use a different set...
by pcmanbob
Wed Oct 20, 2021 9:00 am
Forum: Other
Topic: OctoPi Installer Error
Replies: 1
Views: 85

Re: OctoPi Installer Error

Hi. When I remove the card and boot my pi I'm never able to connect to octopi.local. So are you removing the SD card and then trying to boot your pi ? You have to leave the SD card in the pi so that it can boot from the SD card. I would suggest as a first step , you follow the instructions here and ...
by pcmanbob
Wed Oct 20, 2021 8:54 am
Forum: Troubleshooting
Topic: Raspberry pi cannot ping anything or ssh anymore
Replies: 1
Views: 59

Re: Raspberry pi cannot ping anything or ssh anymore

Hi.

My first suggestion would be to power down the pi and then power cycle the router, once the router has completed its boot process ,
power the pi and see if things work correctly

Are you sure the address you assigned to the pi is not used by anything else including the router ?
by pcmanbob
Tue Oct 19, 2021 10:04 am
Forum: Other projects
Topic: Pre-made Fan Control Circuit
Replies: 2
Views: 144

Re: Pre-made Fan Control Circuit

Hi. You can now get a pre made fan assembly with the control built in form raspberry pi themselves. https://www.raspberrypi.com/products/raspberry-pi-4-case-fan/ You can also get this from the pihut in the UK https://thepihut.com/products/fan-controller-for-raspberry-pi or may be this one https://ww...
by pcmanbob
Mon Oct 18, 2021 12:21 pm
Forum: General discussion
Topic: Dupont cables connection problem
Replies: 14
Views: 484

Re: Dupont cables connection problem

If you look at the internal connections on the 40 pin connector on an 80 way Ultra ATA cable this is what you would find https://i.imgur.com/2TGVgkR.jpg So you could connect this cable to the pi gpio if you drilled out the blanked off hole in the connector, then depending on which way round you plug...
by pcmanbob
Sun Oct 17, 2021 7:20 pm
Forum: General discussion
Topic: Dupont cables connection problem
Replies: 14
Views: 484

Re: Dupont cables connection problem

I still use dupont cables for experimentation , but I remove the plastic form the cables and close up the metal socket inside to make them a better fit then replace the plastic cover. For permanent / finished projects I tend to solder wires to PCB's but I still tend to use sockets on the pi end just...
by pcmanbob
Sun Oct 17, 2021 7:08 pm
Forum: Automation, sensing and robotics
Topic: Automated email send out on event not working
Replies: 25
Views: 1080

Re: Automated email send out on event not working

Then you are going to have to re-write your code. Something like this. cron calls python code , python code turns on sensor then waits 5min, then checks status of sensor, reads last sensor state from file on SD card If its changed then send mail, you will need to add a check to see if its gone from ...
by pcmanbob
Sun Oct 17, 2021 3:02 pm
Forum: Automation, sensing and robotics
Topic: Interfacing with inline fan.
Replies: 11
Views: 485

Re: Interfacing with inline fan.

So the zener diode is just there to limit the the voltage that an be applied to the PWM input/blue wire, not sure why the manufacture would include it seeing as the red wire is a 10V output, But I guess you could be using a separate supply to power the PWM or may be the Red wire /10V is a nominal vo...
by pcmanbob
Sun Oct 17, 2021 11:41 am
Forum: Troubleshooting
Topic: Getting error while trying to update buster
Replies: 1
Views: 64

Re: Getting error while trying to update buster

Hi. A failure message like that normally indicates a problem with your DNS. Can you access any web sites from your pi ? what results do these 8 commands produce when run from a command line or terminal window ? ifconfig ip addr show ip route ip -4 route | awk '/default/ {print $3}' ping -c3 $(ip rou...
by pcmanbob
Sun Oct 17, 2021 11:33 am
Forum: Troubleshooting
Topic: Sudden death on Pi 3B+
Replies: 3
Views: 163

Re: Sudden death on Pi 3B+

Hi.

The pi3B+ was known for sudden failures of the pmic which results in the loss of the 3.3V

Your pi is not repairable :( :( :(
by pcmanbob
Sun Oct 17, 2021 11:28 am
Forum: General discussion
Topic: fixing a dead RPI 4
Replies: 2
Views: 245

Re: fixing a dead RPI 4

I would say you pi is dead and beyond repair , you/we have no way of knowing what other damage your have done.

Also the PMIC although a standard part number , is specifically program for the pi and is not available to the general public.
by pcmanbob
Sun Oct 17, 2021 11:23 am
Forum: Beginners
Topic: Pi hole, Raspbian desktop + 3.5" touchscreen question
Replies: 1
Views: 106

Re: Pi hole, Raspbian desktop + 3.5" touchscreen question

Seeing as you are asking about the workings of pi-hole you'd be better asking on the pi-hole support page

https://discourse.pi-hole.net/

After all they should be the experts on there software set-up, so if what you want is possible they should know.
by pcmanbob
Fri Oct 15, 2021 8:13 am
Forum: Troubleshooting
Topic: GPIO stuck on/off issue
Replies: 7
Views: 269

Re: GPIO stuck on/off issue

Hi. First thing to check is that you have the ribbon cable connected the correct way round, is easy to reverse the connection at the pi end. I would suggest you check to see if you have 5V and 3.3V and grounds on the correct pins at the breadboard end, do this using a multi meter. You could also tes...
by pcmanbob
Thu Oct 14, 2021 6:56 pm
Forum: Automation, sensing and robotics
Topic: Interfacing with inline fan.
Replies: 11
Views: 485

Re: Interfacing with inline fan.

Any general purpose NPN transistor should be fine, but you may need to change the base resistor. Your diode will not do you need a zener diode with the part no. I suggested. You need to build the circuit shown to use pwm speed control , if you just want on off then a relay switching a connection bet...
by pcmanbob
Thu Oct 14, 2021 3:01 pm
Forum: Other projects
Topic: Work project
Replies: 5
Views: 301

Re: Work project

Hi. So yes you will need additional I/O boards, One for the relays , probably one to read the pressure from a 4-20mA transducer, Depending on what you want to drive from the output for pressure alarms you may well need some interfacing circuits. Yes it should be possible using a pi, I would suggest ...
by pcmanbob
Wed Oct 13, 2021 10:34 pm
Forum: Automation, sensing and robotics
Topic: Interfacing with inline fan.
Replies: 11
Views: 485

Re: Interfacing with inline fan.

I assume the fan needs 10V to power it , but the information supplied does not mention that specifically only implies it from the wiring connected to the plug as shown. So the PWM will also need to be 10V based so you need to use the bottom left driver circuit of the 4 shown, as my first post sugges...
by pcmanbob
Wed Oct 13, 2021 7:12 pm
Forum: Automation, sensing and robotics
Topic: Interfacing with inline fan.
Replies: 11
Views: 485

Re: Interfacing with inline fan.

As your fan appears to have a speed controller already built in all you need to do is build the speed control via pwm circuit shown bottom left of the 4 circuits and drive the base of the transistor from one of the pi / Pico gpio pins.

If you need component values suggesting then please ask.
by pcmanbob
Wed Oct 13, 2021 2:02 pm
Forum: General discussion
Topic: Servo not working with Raspberry Pi but works with Arduino
Replies: 10
Views: 524

Re: Servo not working with Raspberry Pi but works with Arduino

Pointless arguing amongst our selves , as the OP has never come back to say if the posted test code worked or not,

or if they had the servo connected correctly or not.

I personally have never had a problem driving generic sg90 servos from the pi, right from when the original pi was released.
by pcmanbob
Tue Oct 12, 2021 1:45 pm
Forum: Troubleshooting
Topic: Under-voltage but the power supply is good.
Replies: 8
Views: 350

Re: Under-voltage but the power supply is good.

The usual reasons for a low volt warning is either

power supply that can't supply the required current at 5 - 5.1V

or

the cable between the power supply and the pi has a wire gauge the is to small and is causing a volt drop over the cable length.
by pcmanbob
Mon Oct 11, 2021 8:50 am
Forum: Automation, sensing and robotics
Topic: Automated email send out on event not working
Replies: 25
Views: 1080

Re: Automated email send out on event not working

So changing the time sleep at the bottom of the program will make no difference , all it does is keep the program running , you can set any time you like and it will not change how the program runs, because you are using event detect to trigger the sending of mail. So as soon as an even is detected ...

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