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by mikronauts
Thu Apr 18, 2019 9:39 pm
Forum: General discussion
Topic: Control powerfull pwm fans with Pi
Replies: 11
Views: 1104

Re: Control powerfull pwm fans with Pi

Good point, max current is only 2A on the L298. Use a cheap L298 driver module, using a 12V power adapter for the fan (one module could handle two independent fans) If you google Raspberry Pi L298 you will find plenty of articles on driving motors like this. That will not work in this case. The fan ...
by mikronauts
Wed Apr 17, 2019 10:13 pm
Forum: General discussion
Topic: Control powerfull pwm fans with Pi
Replies: 11
Views: 1104

Re: Control powerfull pwm fans with Pi

Use a cheap L298 driver module, using a 12V power adapter for the fan (one module could handle two independent fans) If you google Raspberry Pi L298 you will find plenty of articles on driving motors like this. I am interested in the same topic. Since my background is not in electrical engineering, ...
by mikronauts
Tue Apr 09, 2019 1:36 pm
Forum: General discussion
Topic: Which motor control board
Replies: 5
Views: 301

Re: Which motor control board

I have used those - and many other - motor driver boards that need to run on 5V and worked fine from a 3v3 gpio signal. The only exceptions are the rare cases where the control signals need. more than5-10ma One of these? https://www.amazon.co.uk/Neuftech-H-bridge-stepper-controller-Raspberry/dp/B01K...
by mikronauts
Sat Mar 30, 2019 2:17 am
Forum: Beginners
Topic: modbus RTU(rs-485)
Replies: 8
Views: 6223

Re: modbus RTU(rs-485)

You are using an rs422 full duplex adapter, and it can only transmit the way you have it connected. If your software can handle discarding a copy of what you transmit, you can probably connect the rx and tx screw terminals togeather. Attaching a pic of my hardware connection.https://drive.google.com...
by mikronauts
Fri Mar 29, 2019 1:47 pm
Forum: Beginners
Topic: modbus RTU(rs-485)
Replies: 8
Views: 6223

Re: modbus RTU(rs-485)

Odds are that you need to use an ioctl to switch DTE or RTS to switch to receiving. Post the link to the specific device you have, they make both full and half duplex adapters. Hi, I have used a DTech Usb 2.0 to RS485 converter but I can only send data to the connected device but not read from it. W...
by mikronauts
Sun Mar 10, 2019 12:56 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2288

Re: I2C I/O PORT EXPANDER QUESTION

The OP does not want to provide details, when I asked he said led's, when I proposed a simple solution for led's he said it was not led's. In my experience, when a poster is not willing to give details, they want to get free design work for their commercial project. I'm working on a project where a ...
by mikronauts
Tue Mar 05, 2019 3:24 pm
Forum: Automation, sensing and robotics
Topic: Ultrasonic sensor readings become unstable
Replies: 7
Views: 525

Re: Ultrasonic sensor readings become unstable

I am amazed it worked as well as it did for you, as triggering the sensor and reading the result over 20m of cable is a bad idea. Put a pi close to the sensor, and have it report the watet level in a loop over wifi or ethernet. Hi, I am using an ultrasonic sensor to measure the water level in an ext...
by mikronauts
Tue Mar 05, 2019 1:39 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2288

Re: I2C I/O PORT EXPANDER QUESTION

You are welcome. With a bit more software, your project can be immensely simplified. Just use a string of ws2812 style led's (same as used on neopixels) On aliexpress, ebay, or amazon find a 5 meter strip with 60 led's per meter, or get 2 meters of the 144 led per meter tape. You will only need two ...
by mikronauts
Mon Mar 04, 2019 8:34 pm
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2288

Re: I2C I/O PORT EXPANDER QUESTION

You are welcome. Without knowing what you are trying to do, it is basically impossible to offer further help. At a minimum you need to specify - what you are trying to control, as much info as possible - how frequently the devices are to be switched on or off - how far apart the devices are from eac...
by mikronauts
Mon Mar 04, 2019 2:42 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2288

Re: I2C I/O PORT EXPANDER QUESTION

Use mcp23s17 parallel io chips instead of the mcp3208 adcs I used. My circuit ran the chips at 5v I simply used a voltage divider on miso. Fyi, 260 outputs is unusual, I suspect your application might be done differently, wiring 26 long wire will be painful and expensive. Yes, use the same idea I us...
by mikronauts
Sun Mar 03, 2019 10:59 pm
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2288

Re: I2C I/O PORT EXPANDER QUESTION

Yes, use the same idea I used for adc's: https://www.mikronauts.com/raspberry-pi/raspberry-pi-analog-to-digital-conversion-experiments-and-howto/ If you connect eight MCP23017 chips on the I²C bus that gives you 128 GPIO. Connect eight MCP23S17 chips on SPI for another 128 and you still have 22 regu...
by mikronauts
Thu Feb 28, 2019 6:44 pm
Forum: HATs and other add-ons
Topic: ADS1115-ADC Module for Raspberry PI 3 B+
Replies: 5
Views: 603

Re: ADS1115-ADC Module for Raspberry PI 3 B+

I would get a usb audio adapter with line level inputs. I have purchased a ADS1115-ADC Module for my Raspberry 3 B+ for audio streaming. I want to stream Line Level Audio from a mono PA amp. There are six screw terminals for the input GND, ANO, AN1, An2, AN3, 3V3. What two terminals do I use for the...
by mikronauts
Wed Feb 27, 2019 11:57 pm
Forum: Beginners
Topic: Wireless SSD storage?
Replies: 5
Views: 385

Re: Wireless SSD storage?

I wrote an article a couple of years ago on how to use a Pi as a NAS (and googling will find many more examples) https://www.mikronauts.com/raspberry-pi/raspberry-pi-2-nas-experiment-howto/ While a bit dated, it should point you in the right direction Wanting to set up a SSD equipped Pi 3B+ that I c...
by mikronauts
Tue Feb 12, 2019 9:00 pm
Forum: The MagPi
Topic: Proposal for a small robot controller based on RPi Zero
Replies: 8
Views: 1826

Re: Proposal for a small robot controller based on RPi Zero

When the pi0 was introduced, I quickly designed (and produced pcb's) for a Pi Zero form factor robotics hat that was FAR more feature full and powerful than what you are suggesting. I never brought it to market as the RPF is limiting pi0 sales to such an extent that I would lose a lot of money marke...
by mikronauts
Sat Jan 19, 2019 1:29 am
Forum: Troubleshooting
Topic: Any reason why a Pi 3 will not run from a 64 GB card?
Replies: 15
Views: 792

Re: Any reason why a Pi 3 will not run from a 64 GB card?

See if you can store 64Gb of data on it on a pc (formatted on a pc) As you say, it could be a defective card, or possibly a counterfeit card that has no where near 64Gb I am running several Pi's from 16 GB MicroSD cards. I am trying to set one up with a 64 GB card so I can include my mp3 collection ...
by mikronauts
Wed Jan 09, 2019 1:04 am
Forum: HATs and other add-ons
Topic: Case for both the Pi and a 2.5" HD/SSD?
Replies: 9
Views: 737

Re: Case for both the Pi and a 2.5" HD/SSD?

I've done some performance tests like that: https://www.mikronauts.com/raspberry-pi/raspberry-pi-2-usb-hard-drive-and-adapter-tests/ https://www.mikronauts.com/raspberry-pi/how-can-i-add-a-sata-hard-drive-to-a-raspberry-pi-2/ https://www.mikronauts.com/raspberry-pi/raspberry-pi-2-nas-experiment-howt...
by mikronauts
Wed Jan 09, 2019 12:55 am
Forum: Beginners
Topic: Simulating the Pi board GPIO
Replies: 10
Views: 706

Re: Simulating the Pi board GPIO

At the risk of appearing self serving, I tend to use https://www.mikronauts.com/wp-content/upload/2014/01/pi_jumper_schoolboard2.jpg For my simple Pi breadboard experiments (with various Pi models) And more complicated variations as well https://www.mikronauts.com/wp-content/upload/2015/11/pidev.jpg...
by mikronauts
Mon Jan 07, 2019 3:05 am
Forum: Automation, sensing and robotics
Topic: Announcing RoboPi advanced controller for the Raspberry Pi
Replies: 43
Views: 13746

Re: Announcing RoboPi advanced controller for the Raspberry Pi

I have started working on the next firmware revision, and I welcome suggestions for what additional software features you would like to see. With the eight core microcontroller on RoboPi I have some elbow room to play with :) Currently I am considering the following additions in the near future: 1) ...
by mikronauts
Wed Jan 02, 2019 2:03 pm
Forum: Beginners
Topic: Relay boards
Replies: 31
Views: 2975

Re: Relay boards

Fyi, The MCP23017 has 16 i/o pins, so only two are needed. Okay, I get a idea of what you want. What for kind of leds are we talking about. The standaard 5mm leds? So, in your current design you have 4*8 =32 outputs. And that's more than the Rpi can provide. This means that you need to add a i/o exp...
by mikronauts
Fri Dec 28, 2018 6:53 pm
Forum: General discussion
Topic: Kodi PVR
Replies: 11
Views: 1121

Re: Kodi PVR

You wrote tv in canada... I assumed you meant over the air atsc.

No idea on how to record streams.
thadaddyy wrote:
Fri Dec 28, 2018 6:35 pm
I'm getting TV via the internet. For HDhomerun is it best to use the hdhomerun pvr add on in Kodi?
by mikronauts
Fri Dec 28, 2018 4:18 pm
Forum: General discussion
Topic: Kodi PVR
Replies: 11
Views: 1121

Re: Kodi PVR

Hdhomerun + kodi should do it.
thadaddyy wrote:
Fri Dec 28, 2018 4:35 am
Hey guys, what is the best hardware/software combo to record live TV in Kodi? I'm in Canada and basically looking for PVR type function.
by mikronauts
Tue Dec 25, 2018 8:59 pm
Forum: HATs and other add-ons
Topic: Emulated eeprom ok for hats?
Replies: 4
Views: 446

Re: Emulated eeprom ok for hats?

Thanks ... it is always good to reduce BOM costs.
mahjongg wrote:
Tue Dec 25, 2018 8:45 pm
The POE HAT uses an emulated EEPROM, and also controls the fan with the same microcontroller.
by mikronauts
Tue Dec 25, 2018 8:31 pm
Forum: HATs and other add-ons
Topic: Emulated eeprom ok for hats?
Replies: 4
Views: 446

Re: Emulated eeprom ok for hats?

Thank you!
hippy wrote:
Tue Dec 25, 2018 7:14 pm
"this is fine as long as the Pi can't tell the difference!"

https://github.com/raspberrypi/hats/issues/43
by mikronauts
Tue Dec 25, 2018 7:05 pm
Forum: HATs and other add-ons
Topic: Emulated eeprom ok for hats?
Replies: 4
Views: 446

Emulated eeprom ok for hats?

Any objections from RPF to emulated (instead of physical) eeproms on hats?

(I am working on a new product and I am trying to minimize the parts count and BOM costs)
by mikronauts
Tue Dec 25, 2018 6:13 pm
Forum: Camera board
Topic: Creating a RPI-assisted microscope
Replies: 51
Views: 7899

Re: Creating a RPI-assisted microscope

REALLY nice work guys!

I will follow this thread and build my own for my smt work.

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