Go to advanced search

by walterwoj
Mon Jul 22, 2019 11:22 am
Forum: Beginners
Topic: GPIO Floating Flimflamery
Replies: 2
Views: 99

Re: GPIO Floating Flimflamery

Perfect! Thanks! :D
by walterwoj
Mon Jul 22, 2019 3:52 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: New "gpio" config.txt command announcement
Replies: 36
Views: 9468

Re: New "gpio" config.txt command announcement

I hope no one minds me bringing this back from the dead but I have a question about the implementation: Doe the order of the commands reflect the order they are executed? IE, If I do gpio mode 16 output then the pin will go LOW into output mode (which in my case triggers a relay to the 'on' state), ...
by walterwoj
Mon Jul 22, 2019 2:07 am
Forum: Beginners
Topic: GPIO Floating Flimflamery
Replies: 2
Views: 99

GPIO Floating Flimflamery

I have previously posted here and here and here about my plans for using my pi to control my garage. I have got all the control components hooked up the way they should be but have not gotten any of the external components wired in. Now that everything is connected and mounted in the case I am doing...
by walterwoj
Wed Jul 10, 2019 10:32 pm
Forum: Beginners
Topic: Is it a true ground?
Replies: 5
Views: 201

Re: Is it a true ground?

Thank you for the quick answers. I will wire it the less easy but definitely safer way.
by walterwoj
Wed Jul 10, 2019 10:07 pm
Forum: Beginners
Topic: Is it a true ground?
Replies: 5
Views: 201

Is it a true ground?

Are the ground pins true grounds? That is do they go directly to ground or is there circuitry between the pins and ground. What I want to do is ground more than 3/5 volts and more amps than I'm drawing from the pi. I have a board that I will use to drive higher dcv items and it has a shared ground f...
by walterwoj
Tue Apr 16, 2019 1:37 pm
Forum: Beginners
Topic: Resistor Question
Replies: 3
Views: 195

Re: Resistor Question

That is good news. I didn't want to hack in a bunch of resistors. :ugeek: I'm going to drive the PI side with 3.3vdc from a buck transformer. The input side is going to be mixing a bunch of voltages (all DC) from 5 volts (microswitch) to 24 volts (the motion sensor requires 24vdc) Since each 'lane' ...
by walterwoj
Mon Apr 15, 2019 4:42 pm
Forum: Beginners
Topic: Resistor Question
Replies: 3
Views: 195

Resistor Question

I am looking at purchasing this board to use as a kind of input buffer in my project. I want to employ sensors (micro switches) to check the open/closed state of several doors and to take input from motion sensors. These boards have 3k resistors (according to the schematics) on both ends so I wanted...
by walterwoj
Mon Apr 01, 2019 6:07 pm
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

One of the things that initially bemused me was that "3 Channel AC 220V Optocoupler Isolation Board AC Detection Testing Module" being referred to as a relay - it isn't. Without having one in my hands, I can't be sure, but it appears to take in three phases and neutral, rectify them, and pass the r...
by walterwoj
Mon Apr 01, 2019 6:01 pm
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

ptimlin: Sorry but the seller (and google) have not provided any schematics or instructions for this board. I did request them but did not get a response so I'll have to figure this out the hard way. also, THANK YOU for that explanation of active low, It still drives me nuts but at least I understan...
by walterwoj
Mon Apr 01, 2019 1:10 am
Forum: Beginners
Topic: Pi + Relay + LED require resistor?
Replies: 5
Views: 178

Re: Pi + Relay + LED require resistor?

Oops! you got me! Apparently I asked the same question twice! :mrgreen:
by walterwoj
Mon Apr 01, 2019 1:06 am
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

Same test as above, but with VCC = 3.3VDC. If the output is above 3VDC or so, it should have no problem being recognized by the Pi (forget what the exact input voltage low threshold is at the moment). The move your high side input to L2, and measure OUT2, then L3 & OUT3 just to be sure all of the c...
by walterwoj
Mon Apr 01, 2019 12:20 am
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

davidcoton: Ironically I have a far better understanding of mains electric than this other stuff that you guys claim is electric! :ugeek: <good humored rant> For example: if I put a wall switch in my house and turn it off, if I test for voltage at the light, guess what voltage I will get? 0 volts! E...
by walterwoj
Sun Mar 31, 2019 10:23 pm
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

ok, i'm clearly out of my depth! #4.) VCC to 5.19v, GND to GND and LED from out3 to VCC. 0v dc at rest, 0v dc when in3 has 110v. BUT!!!! The LED lights brightly, like 5 volts bright even though my meter says 0 volts. WTF is going on here? I don't understand how this circuit works but it does. Can an...
by walterwoj
Sun Mar 31, 2019 10:03 pm
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

Interestingly I was just testing that the way you suggested. It would appear that: 1.) if I connect vcc and ground to a 5v power supply and put a led from out3 to gnd (-) I get 2.63v on the LED (no 110v), once I apply 110v to the input I get 0v and the LED goes out. 1a.) If I omit the LED and only r...
by walterwoj
Sun Mar 31, 2019 8:52 pm
Forum: Beginners
Topic: GPIO does not drive relay board properly
Replies: 10
Views: 368

Re: GPIO does not drive relay board properly

For those who are interested I purchased this relay board and powered it externally according to these instructions and it works perfectly in my testing so far. It does work counter-intuitively (active low) in my opinion but it does work reliably.
by walterwoj
Sun Mar 31, 2019 8:38 pm
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Re: Input Relay Board

PhatFil: Thank you for the alternate ideas but they have already been considered and discarded. I have the board in question in my possession already and I believe it will be perfectly safe on the 110v side for what I am doing (checking the power state of 2 x 3-way switches to tell me if the light i...
by walterwoj
Sun Mar 31, 2019 8:09 pm
Forum: Beginners
Topic: Input Relay Board
Replies: 22
Views: 658

Input Relay Board

So... previous I posted looking for an input relay. I have found this one and after asking the seller they replied that it would work for 110 volts as well as 220 volts. (yet to be conclusively tested). Anyway... I want to use it as an put to detect 110 volts. I am comfortable with the 110 side wiri...
by walterwoj
Sun Mar 31, 2019 7:35 pm
Forum: Beginners
Topic: Pi + Relay + LED require resistor?
Replies: 5
Views: 178

Re: Pi + Relay + LED require resistor?

1.) You are right, my relay board is active low (weird to my thinking) 2.) They are 12 volt LEDs but they do light on 5 volts (tested) and 3 volts (also tested) FYI: I have the relay board externally powered so it is not drawing all the power it needs from the PI So here are my 2 questions: 1.) can ...
by walterwoj
Sat Mar 30, 2019 2:05 pm
Forum: Beginners
Topic: Pi + Relay + LED require resistor?
Replies: 5
Views: 178

Pi + Relay + LED require resistor?

I have a 8 channel relay that I am going to control with my pi. I was planning on running a jumper directly from the pi to the relay and put the to pin to a high state to activate the relay. I would also like to tap into the jumper to run a status led (blue 12v) to ground. Will this work? Do I need ...
by walterwoj
Sat Mar 16, 2019 9:00 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 1187

Re: Input Relays

NGC6543: Thank you! A recommendation like that is what I was looking for. :mrgreen:
by walterwoj
Sat Mar 16, 2019 5:56 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 1187

Re: Input Relays

drgeoff: Can you point me towards some 110v optocouplers then? My google-fu is failing me and I'm not finding any rated for that input. I did find this one but it's rated for 220v and in don't know that it will work on 110v
by walterwoj
Sat Mar 16, 2019 5:35 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 1187

Re: Input Relays

drgeoff: Generally optocouplers are low voltage and DC. I need 110vac on one end and 3.3/5vdc on the other. Also relays are by nature isolators for stepping up/down voltage or changing types of power (ac/dc) All I'm really looking for is some recommendations on RELAYS, please? 110vac coil designed f...
by walterwoj
Sat Mar 16, 2019 4:23 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 1187

Re: Input Relays

boyoh: I agree with you about safety and the requirement of mains knowledge. I would say my knowledge of mains power is excellent as I have several house re-wires and entrance cable/service panel/meter socket installs under my belt. I'm not an electrician but I'm as close as you can get without the ...
by walterwoj
Fri Mar 15, 2019 11:23 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 1187

Input Relays

I'm looking for a suggestion for where to get (which ones to get) multiple relays (4) to use for power sensing inputs. I'm looking for 110vac input relays that can close a 3.3/5vdc circuit. preferably 4+ on one board or at least easily connected to the pi and wire used in pi projects. You thought ar...

Go to advanced search