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by Schorschi
Wed Apr 25, 2018 2:34 pm
Forum: General discussion
Topic: Reading PC Fan (3-wire) Tachometer? Never above 0.5v?
Replies: 4
Views: 1526

Re: Reading PC Fan (3-wire) Tachometer? Never above 0.5v?

Right, I can see the logic of using a pull up on the GPIO pin (3.3v) as external 10k to ground or use internal, as the typical input circuit design for GPIO input. But I can't or would never connect any thing 12v to a GPIO pin, ever. That recommendation had me quite confused.
by Schorschi
Mon Apr 23, 2018 8:14 pm
Forum: General discussion
Topic: Reading PC Fan (3-wire) Tachometer? Never above 0.5v?
Replies: 4
Views: 1526

Reading PC Fan (3-wire) Tachometer? Never above 0.5v?

Been reading a lot about how to monitor a PC fan with a Raspberry Pi (or any microcontroller actually). The fan is actually cooling an internet router is that is in a harsh location, the Pi will just monitor the fan, if the fan dies, email alert, etc. sent. Many references state that the fan can gen...
by Schorschi
Mon Apr 23, 2018 4:31 am
Forum: General discussion
Topic: Remote switch goes from high to low? How to translate that to GPIO function?
Replies: 3
Views: 744

Re: Remote switch goes from high to low? How to translate that to GPIO function?

First, can't use IR, this is RF remote scenario only. Second, I think I have already addressed some of the concerns you noted. Let me qualify below, if I missed something, please note such, all feedback and input welcome. The remote is only powered by 5v, given how I implemented the solution, right ...
by Schorschi
Sat Apr 21, 2018 9:11 pm
Forum: General discussion
Topic: Recommend GPIO expander (like PCF8574) but default/initial state is not input?
Replies: 2
Views: 1179

Recommend GPIO expander (like PCF8574) but default/initial state is not input?

Can anyone recommend GPIO expander (like PCF8574) but default state is not as input? I have used the PCF8574 for a number of projects, but now have a project where I need the default/initial state to be output LOW? The input state is triggering the downstream devices unfortunately and I need to avoi...
by Schorschi
Sat Apr 21, 2018 6:08 am
Forum: General discussion
Topic: Remote switch goes from high to low? How to translate that to GPIO function?
Replies: 3
Views: 744

Re: Remote switch goes from high to low? How to translate that to GPIO function?

Ok, did a bit more testing, I actually setup a transistor (2N3904 since I had it) where I setup the collector as a 5v source, same as what is powering the remote. Then I set the emitter to GND, and the base to GPIO pin. Yes I used a resistor on the base pin, to drop the 3.3v down a bit to avoid amp ...
by Schorschi
Sat Apr 21, 2018 2:54 am
Forum: General discussion
Topic: Driving a single WS2811/WS2812 SMD, not a strip
Replies: 8
Views: 2002

Re: Driving a single WS2811/WS2812 SMD, not a strip

I will try driving the control signal at 5v. I have a Arduino UNO Rev3 arriving in a few days, yeah, I know been using Pi for years, well, it was about time to expand my range of controllers. :) Since the Arduino drives logic at 5v, seems perfect time to test this. The odd thing is, I have an older,...
by Schorschi
Fri Apr 20, 2018 10:13 pm
Forum: General discussion
Topic: Remote switch goes from high to low? How to translate that to GPIO function?
Replies: 3
Views: 744

Remote switch goes from high to low? How to translate that to GPIO function?

Remote switch goes from high to low? How to translate that to GPIO function? Bare with me here, I am not an electronics engineer, but learning as I go. Here is the situation: 1) Have a remote control, that I plan to cannibalize for my project 2) The buttons (i.e. switches) I want to simulate or acti...
by Schorschi
Mon Apr 16, 2018 12:43 am
Forum: Troubleshooting
Topic: SaintSmart 2 channel SSR Closes But Never Opens?
Replies: 6
Views: 824

Re: SaintSmart 2 channel SSR Closes But Never Opens?

Yup, it is a lemon... I tried with a true 5v source to the control logic pins, did the ground trick, rather than 3.3v converted to 5v via the Pi, and the behavior was the same. Both relies will close but neither will open after close, unless I remove all power from the module. They just get... in a ...
by Schorschi
Sun Apr 15, 2018 11:50 pm
Forum: Troubleshooting
Topic: SaintSmart 2 channel SSR Closes But Never Opens?
Replies: 6
Views: 824

Re: SaintSmart 2 channel SSR Closes But Never Opens?

Thanks, I thought of the 5V control logic issue as well, after posting, so I used a bi-directional signal leveler, turning the 3.3v GPIO pin signal to 5v (validated with my multi-meter). This would close the relay, but the relay never opens. The relay starts with high, and goes low and the relay clo...
by Schorschi
Sun Apr 15, 2018 11:21 pm
Forum: Python
Topic: A Can of Worms: RPi.GPIO CleanUp
Replies: 7
Views: 1684

Re: A Can of Worms: RPi.GPIO CleanUp

The reference to can of worms... is descriptive of the catch-22 'shared' GPIO pins represents... not a qualification of the RPi.GPIO solution, which I use, and think is great, allowing for a couple of quirks about GPIO in general. The issue is, that processes can't with ease, share GPIO pins. Proces...
by Schorschi
Sun Apr 15, 2018 10:43 pm
Forum: General discussion
Topic: Driving a single WS2811/WS2812 SMD, not a strip
Replies: 8
Views: 2002

Re: Driving a single WS2811/WS2812 SMD, not a strip

No has ever tried to use these WS2811 based FC-100 modules? Please, anyone, really stuck on how to get these working!
by Schorschi
Sat Apr 14, 2018 12:42 am
Forum: General discussion
Topic: Loaded Question? Best Arduino Model To Use With Pi?
Replies: 2
Views: 448

Loaded Question? Best Arduino Model To Use With Pi?

Ok, I know this is a loaded question... What is the best Arduino to use with a Raspberry Pi? But I am a complete Arduino noob. Been using Pi since, oh, 2012? or so. But now is the time to jump into the 'other' side. I have do main desires for using an Arduino hardware based PWM and analog sensor dat...
by Schorschi
Thu Apr 12, 2018 9:34 pm
Forum: General discussion
Topic: Does this relay have optocoupler isolation?
Replies: 1
Views: 355

Does this relay have optocoupler isolation?

Does this relay https://www.ebay.com/itm/172543574078?ul_noapp=true have optocoupler isolation? It looks like it does not? I was unable to find any schematic for this module. Vendor declined to provide it. I plan to drive the relay via an IO control board using https://www.ebay.com/itm/PCF8574-PCF85...
by Schorschi
Thu Apr 12, 2018 2:05 pm
Forum: Troubleshooting
Topic: SaintSmart 2 channel SSR Closes But Never Opens?
Replies: 6
Views: 824

SaintSmart 2 channel SSR Closes But Never Opens?

I have a SaintSmart (believe it to be the real deal, not a cheap copy) 2 channel SSR relay, and it is driving me nuts. I can close either relay, but I can never open them. The leds go on and off as expected, but the SSR relays never open again. I have to remove power to reset the module. I guess I g...
by Schorschi
Wed Apr 11, 2018 3:12 pm
Forum: General discussion
Topic: Recommended wifi ICs to use with Raspberry Pi?
Replies: 1
Views: 426

Recommended wifi ICs to use with Raspberry Pi?

Is there a reference to recommended wifi ICs to use with Raspberry Pi? I just got a couple of wifi dongles, they work great on Windows 10, for example, but on Linux, a lot of hoops to jump through to get them to work... they happened to be based on RTL8811AU IC. Which seems to be an odd Wifi IC unde...
by Schorschi
Wed Apr 11, 2018 2:36 pm
Forum: Troubleshooting
Topic: (UPDATE) Drivers for TL-WN725N V2 - 3.6.11+ -> 4.xx.xx+
Replies: 1497
Views: 1451412

Re: (UPDATE) Drivers for TL-WN725N V2 - 3.6.11+ -> 4.xx.xx+

By the way, Mr E. You install-wifi script is WONDERFUL! Big THANK YOU for that.
by Schorschi
Wed Apr 11, 2018 2:35 pm
Forum: Troubleshooting
Topic: (UPDATE) Drivers for TL-WN725N V2 - 3.6.11+ -> 4.xx.xx+
Replies: 1497
Views: 1451412

Re: (UPDATE) Drivers for TL-WN725N V2 - 3.6.11+ -> 4.xx.xx+

Unfortunately, the http://www.daveconroy.com/turn-your-ras ... s-chipset/ link or source you referenced above is dead. Get 404 error.
by Schorschi
Tue Apr 10, 2018 7:49 pm
Forum: Troubleshooting
Topic: Raspbian Stretch: Wifi not starting on boot
Replies: 94
Views: 156470

Re: Raspbian Stretch: Wifi not starting on boot

I solved the issue backwards, I rebuilt my OS image, redid the configuration from scratch, installed kernel, kernel sources, and compiled the driver again, and validated the wpa_supplicant setup again, using a interface named file. And now I think it is working. The predictable names feature does no...
by Schorschi
Tue Apr 10, 2018 6:52 pm
Forum: Raspberry Pi OS
Topic: Driver installation impossible? RTL8812AU
Replies: 72
Views: 32413

Re: Driver installation impossible? RTL8812AU

Just for reference... Got the driver in install-wifi (version 4.3.14) to work with RTL8811AU chip wifi dongle. This is even on kernel 4.14.33(-v7+) no less. But any newer version of the driver source, say 4.3.20 for example, the RTL8812AU driver does not see the RTL8811AU chip. Not have I found any ...
by Schorschi
Wed Apr 04, 2018 1:57 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: HDMI To VGA and Avocent DSR8035
Replies: 5
Views: 1998

Re: HDMI To VGA and Avocent DSR8035

I got a few of the DSRAVIQ-USB2 dongles to work with Pi 2 and Pi 3 models, using a BENFEI HDMI to VGA active converted/adapter (similar to the UGREEN). I had to provide the HDMI to VGA device with 5v external source. This got my Avocent 2035 (ancient but works!) KVMoIP unit to see the dongles, and e...
by Schorschi
Wed Apr 04, 2018 1:10 am
Forum: Troubleshooting
Topic: Raspbian Stretch: Wifi not starting on boot
Replies: 94
Views: 156470

Re: Raspbian Stretch: Wifi not starting on boot

I am in one of the areas where the Wifi space is just buried in overlapping and overloaded channel assignments. At any given time of the day, I can scan between 25 and 50 different cells. Everyone just layered on top of everyone else. So the transmit power level from Pi (client) to access or router ...
by Schorschi
Tue Apr 03, 2018 12:47 am
Forum: Troubleshooting
Topic: Raspbian Stretch: Wifi not starting on boot
Replies: 94
Views: 156470

Re: Raspbian Stretch: Wifi not starting on boot

I have a different issue, I have a Pizero W and and older Model B (512 MB) that both work some of the time with Wifi. Right after a reboot, I often seen no wlan0 interface, and if kill dhcpcd and run it again, I often get the classic no carrier issue. But I know the Wifi dongle on the Model B is goo...
by Schorschi
Fri Mar 30, 2018 6:42 pm
Forum: General discussion
Topic: Driving a single WS2811/WS2812 SMD, not a strip
Replies: 8
Views: 2002

Driving a single WS2811/WS2812 SMD, not a strip

Has any one had any success driving a single WS2811/WS2812 SMD LED breakout module? I was able to get a 8 LED bar I already had, to work using rpi_ws281x as available on GitHub. https://github.com/jgarff/rpi_ws281x But driving a single LED module does not seem to work. I set the number of LEDs to 1,...
by Schorschi
Sun Mar 25, 2018 6:42 pm
Forum: Python
Topic: A Can of Worms: RPi.GPIO CleanUp
Replies: 7
Views: 1684

A Can of Worms: RPi.GPIO CleanUp

This is to pose a question about the RPi.GPIO cleanup routine code logic. It is a can of worms, not because it is not correct or does not make sense how it works, for simple, straight-forward GPIO use, but the limit and restriction of the current code logic is black or white, all or nothing methodol...
by Schorschi
Wed Mar 14, 2018 2:51 pm
Forum: Troubleshooting
Topic: Raspbian Stretch: Wifi not starting on boot
Replies: 94
Views: 156470

Re: Raspbian Stretch: Wifi not starting on boot

Putting the wpa-supplicant.conf file on /boot is not working for me. I am using just a Pi Zero with WIFI dongle, RTL8818EUS chip based. I have to do # ip link set wlx00... up, to get the dongle to be recognized. For DHCP IP address offer/acceptance to initiate. Clean raspbian build as well. Do not s...

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