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by bortek
Fri Sep 14, 2018 6:48 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

Hehe good catch. I forgot to move the diode of course :) Now this looks better. I have also tested as you suggested higher V2 and the simulation keeps it tight up to 12V :)

Perhaps I should rewire my PCB to this , just for fun ;)
sim2.JPG
sim2.JPG (137.28 KiB) Viewed 1697 times
by bortek
Tue Sep 11, 2018 8:30 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

Hi Here comes another update. :) thanks for the code first of all. After many clicks in LTspice I was able to get the same view as you had on your pics. Then with the help of some googling and reading up on transistors I came up with these modification. According to simulation we have the inverted s...
by bortek
Sun Sep 09, 2018 3:25 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

Great. Will try it tonight. I hope this one is without extra transistor cause I want to find out myself how to invert the signal. 😂
by bortek
Sun Sep 09, 2018 7:45 am
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

It works. :) Thanks again for your help. I can spin motor now from zero to its max rpm and even read rpm on tacho pin. I learned something new during this little troubleshooting journey. 👍 Now I wonder how shall the inverter transistor be connected to invert the signal electronically (as u suggested...
by bortek
Sat Sep 08, 2018 8:51 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

An update. Now I am at the country house where the fan is located. I built everything according to the schematic and also added zener diod. I connected V2 on your schematic to pin3 of the motor where it supplies with 10v from motor. Now what happens is that motor goes into full blow at 10% pwm and i...
by bortek
Mon Aug 20, 2018 7:07 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

No I don't have any but I can order some online. Which one ?
by bortek
Sat Aug 18, 2018 3:31 am
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

Ok let me try jt iut. Any suggestions on which transistor, resistance and diodeti choose?
by bortek
Fri Aug 17, 2018 8:23 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

Yes thats what I actually tested and reported in the previous posts. If I short pins 2 and 3 of the motor I get a full blow and RPM reported is something above 2500. And you might be right now :) when I look at the diagram it might look like they want transistor, resistor and diod to be connected in...
by bortek
Fri Aug 17, 2018 11:24 am
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

I use yello(tacho9 and blue (GND) pins to control the motor speed using PWM signal from pi zero. I connect them to pins 12 (BCM18/PWM0) and 14(GND) . Then I use the following script to send the PWM signal out on pin 12. It starts at 50% PWM and goes up to 100% which is 970rpm of possible 2580. I hav...
by bortek
Thu Aug 16, 2018 8:56 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

My bad. It turns out the readings were correct. I wasn't actually getting full speed as I though. I am controlling the motor using PWM and when I set it to 100% it not really a full speed. I found it out when I controlled it with potentiometer then setting to max it just goes like crazy and I got 25...
by bortek
Thu Aug 16, 2018 6:32 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

Re: How to read motor's tach out open collector

Connected and using internal pullup resistor and it seems to work. I use http://abyz.me.uk/rpi/pigpio/examples.html#Python_read_RPM_py to read the RPM. But I am getting quite a low value. Readings are different on different speeds. But they do not match the specs. On max speed the the reading is 970...
by bortek
Sat Aug 11, 2018 8:56 pm
Forum: Automation, sensing and robotics
Topic: How to read motor's tach out open collector
Replies: 25
Views: 2721

How to read motor's tach out open collector

I have this motor which has a tach output that I want to use to read motors RPM. https://docs-emea.rs-online.com/webdocs/1328/0900766b81328e26.pdf On page 4 there is a shcematic diagram and it also says Tach output: open collector, 1 pulse per revolution, electrically isolated. How do I connect tach...
by bortek
Mon Jul 10, 2017 12:50 pm
Forum: Graphics, sound and multimedia
Topic: HDMI to CSI-2 via TC358743 on kernel 4.1
Replies: 585
Views: 180623

Re: HDMI to CSI-2 via TC358743 on kernel 4.1

Can anyone confirm that Auvidea B102 is working?
by bortek
Thu Feb 23, 2017 8:02 am
Forum: Camera board
Topic: Pi Camera IR LED controling via sfotware
Replies: 0
Views: 317

Pi Camera IR LED controling via sfotware

I am planing on getting this IR LED camera Kit. The LEDs are activated in the darkness which is controlled by the light sensors and can be adjusted. But I need to be able to turn them on/off on demand via software. Anyone know if this can be done via camera signals? Alternatively how can I achieve t...

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