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by Idahowalker
Sat Feb 03, 2018 1:25 am
Forum: Troubleshooting
Topic: Getting Freecad to run on Pi3
Replies: 5
Views: 2484

Re: Getting Freecad to run on Pi3

:D My solution after trying to get several cad (electronics) programs to run was when I installed KiCAD. There was a learning curve of about a day but I was able to get my first schematic of a RPi3 and Arduino Uno project drawn up. Fritzing was loading and stopped at 70% for an hour. I did the deed ...
by Idahowalker
Wed Jan 31, 2018 1:42 am
Forum: General discussion
Topic: Open or Closed Circuit Detection
Replies: 6
Views: 4773

Re: Open or Closed Circuit Detection

However, is there a way to do this same function with interrupts? Yes, I am posting a post I made in another thread: There is another way of doing the thing: Instead of running a loop, why not use an event trigger? def fDoTheThing(): try: fSetup() GPIO.add_event_detect(iPinIn2, GPIO.RISING, callbac...
by Idahowalker
Wed Jan 31, 2018 12:18 am
Forum: Advanced users
Topic: Raspberry pi zero w dongle problem
Replies: 7
Views: 748

Re: Raspberry pi zero w dongle problem

I have no idea if this will help but do a search on, say Amazon, for: Raspberry pi 4 Port USB HUB HAT Compatible With USB2.0 1.1 For Raspberry Pi Zero/W A+ B B+ 2 3 Model B
by Idahowalker
Tue Jan 30, 2018 11:10 pm
Forum: Troubleshooting
Topic: gpio output voltage drops when connecting relay
Replies: 19
Views: 2122

Re: gpio output voltage drops when connecting relay

Are you using a: Model:D4840 SSR-40DA or Model:D4840 SSR-40DD?

http://datasheet.octopart.com/D4840-Cry ... 468522.pdf

The model D is the one to be using not the A

The model A is made for AC input and the model D is for DC input, just saying.

*shrug*
by Idahowalker
Tue Jan 30, 2018 10:23 pm
Forum: Troubleshooting
Topic: gpio output voltage drops when connecting relay
Replies: 19
Views: 2122

Re: gpio output voltage drops when connecting relay

Something like this will work:

Image

or this:

Image
by Idahowalker
Mon Jan 29, 2018 6:32 pm
Forum: Beginners
Topic: power relay with timer
Replies: 1
Views: 267

Re: power relay with timer

You could, possibly, start with something like this:Power Relay Module for Raspberry Pi https://smile.amazon.com/Raspberry-Pi-Expansion-Module-XYGStudy/dp/B01G05KLIE/ref=sr_1_3?ie=UTF8&qid=1517250450&sr=8-3&keywords=raspberry+pi+relay+hat and then move onto some Python programming. to finish the tim...
by Idahowalker
Mon Jan 29, 2018 2:18 pm
Forum: Beginners
Topic: Measure the voltage output of a PV module
Replies: 54
Views: 4923

Re: Measure the voltage output of a PV module

boyoh wrote:
Mon Jan 29, 2018 1:57 pm
This circuit might work using a Opto , giving total isolation between
I believe the circuit, that boyoh posted, has possibilities.
by Idahowalker
Mon Jan 29, 2018 1:36 pm
Forum: Beginners
Topic: Measure the voltage output of a PV module
Replies: 54
Views: 4923

Re: Measure the voltage output of a PV module

Ughhh. No! not exactly. I appreciate the feedback but it would help me even more if you could point out why it would not work like this. If I was using a ruler to measure a distance and the markings of the ruler kept changing I wold not be able to accurately measure the distance. Using the PV as a ...
by Idahowalker
Sun Jan 28, 2018 5:56 pm
Forum: Beginners
Topic: Setting the default paths
Replies: 0
Views: 136

Setting the default paths

I looked and either I missed it, which is highly possible, or...Eh...*shrug* Anyways. I have got a 32GB SD card in one of the USB ports and I'd like to start pointing some defaults to that SD card. I'd like to start with setting the DownLoad folder and, eventually other default paths to the spare SD...
by Idahowalker
Fri Jan 26, 2018 3:32 pm
Forum: Beginners
Topic: Measure the voltage output of a PV module
Replies: 54
Views: 4923

Re: Measure the voltage output of a PV module

When I approach the issue of connecting a something to the RPi GPIO line is from the viewpoint of isolation. I know many designs that connect a resistor divider network to the RPi but, and this is just me, I do not count on resistor networks to properly secure my Pi. Another aspect of the problem yo...
by Idahowalker
Tue Jan 23, 2018 3:39 am
Forum: Beginners
Topic: Powering Pi3b from car battery, need some advice on capacitors.
Replies: 7
Views: 936

Re: Powering Pi3b from car battery, need some advice on capacitors.

Do a search for a 'time delay relay' and use it to power the Pi using proper voltage regulation and so forth. .

When power to the time delay relay coil is cut, that power stoppage could be detected by the Pi and a shut down can be started before the time delay relay times out and cuts Pi power.
by Idahowalker
Fri Jan 19, 2018 1:08 pm
Forum: Beginners
Topic: Time.Sleep to Manage Intermittent Polling of Sensors?
Replies: 3
Views: 351

Re: Time.Sleep to Manage Intermittent Polling of Sensors?

There is another way of doing the thing: Instead of running a loop, why not use an event trigger? def fDoTheThing(): try: fSetup() GPIO.add_event_detect(iPinIn2, GPIO.RISING, callback=fCallBack, bouncetime = 20) #wait for stop signal GPIO.wait_for_edge(iPinIn1, GPIO.FALLING) GPIO.cleanup() #clean up...
by Idahowalker
Thu Jan 18, 2018 6:31 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 27
Views: 1687

Re: Pi detecting activity - resistor needed?

BendinWire wrote:
Thu Jan 18, 2018 6:05 pm
I actually do (you might have missed it). My code is near the top of this thread and I'm using callbacks instead of while loops. But I thought I'd try out pcmanbob's code just for the heck of it....
Oi! Bonk. I did ignore the event operation in your code.
by Idahowalker
Thu Jan 18, 2018 6:10 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 27
Views: 1687

Re: Pi detecting activity - resistor needed?

@idahowalker - this is all fantastic info. My challenge is this whole gate controller/package lives in a small 16"x16"x6" very cramped-already box cemented in a gate post. The routing to the gate sensor is a tiny hole that was tough even bringing the two thin 18 gauge wire through (which is also sh...
by Idahowalker
Thu Jan 18, 2018 6:00 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 27
Views: 1687

Re: Pi detecting activity - resistor needed?

Instead of running a loop, why not use an event trigger? def fDoTheThing(): try: fSetup() # event to read serial port GPIO.add_event_detect(iPinIn2, GPIO.RISING, callback=fCallBack, bouncetime = 20) #wait for stop signal GPIO.wait_for_edge(iPinIn1, GPIO.FALLING) GPIO.cleanup() #clean up on normal ex...
by Idahowalker
Thu Jan 18, 2018 5:29 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 27
Views: 1687

Re: Pi detecting activity - resistor needed?

With a long wire pair, you have an antenna. Shielding and grounding the shield may help Putting, as close as possible to the RPI case a Clip-on Ferrite Ring Core around the shielded wire pair might help with spurious signal reception. Placing a MOV from each wire to the ground wire may help. Putting...
by Idahowalker
Mon Jan 15, 2018 7:23 pm
Forum: Beginners
Topic: Internal pull up/down function explanation
Replies: 16
Views: 20475

Re: Internal pull up/down function explanation

Another way to look at the pull up / down is to consider the output in a default state. When a pull up is used there is a 1 'felt' at the output when the input is not being used and when the pull down is used there is a 0 'felt at the output when the input is not being used. If 'something' is connec...
by Idahowalker
Thu Jan 04, 2018 10:53 pm
Forum: Advanced users
Topic: upload sketch to standalone ATMega328P via serial port?
Replies: 5
Views: 2534

Re: upload sketch to standalone ATMega328P via serial port?

I am interested in the ultimate answer to your question but I am not at that place, yet. I am still waiting for OptoIsolators to arrive so I can connect them between the RPi3 and an Uno. I been working on using the GPIO pins as interrupts. Such as GPIO 4 (J8 pin 4) could be used for the DTR and trig...

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