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by mikronauts
Wed Apr 15, 2020 11:17 pm
Forum: Other projects
Topic: Medical Facility needs help with UVC sensor / script
Replies: 14
Views: 1074

Re: Medical Facility needs help with UVC sensor / script

Everyone,

DougieLawson is absolutely right, please make sure you do not expose yourself to UV-C light.
by mikronauts
Wed Apr 15, 2020 9:59 pm
Forum: Other projects
Topic: Medical Facility needs help with UVC sensor / script
Replies: 14
Views: 1074

Re: Medical Facility needs help with UVC sensor / script

Will do, thank you. I am old enough to still have an eeprom eraser :) thinking of making a box with a safety switch that kills power when the lid is lifted. maybe even inner and outer lids with the kill switch on the outer lid... I already have the ADC's and Pi's, so after I get the sensors and some...
by mikronauts
Wed Apr 15, 2020 9:12 pm
Forum: Other projects
Topic: Medical Facility needs help with UVC sensor / script
Replies: 14
Views: 1074

Re: Medical Facility needs help with UVC sensor / script

Ok, this is a project I can get behind. I assume open source? I have a bit of a design background in such matters :) so I can help you get both the software and hardware running. I am ordering some of these modules and UVC lamps today, and reading the data sheets for the sensor, after which I can re...
by mikronauts
Tue Apr 14, 2020 11:22 pm
Forum: Other projects
Topic: combining 2 pi 4s
Replies: 14
Views: 740

Re: combining 2 pi 4s

NO
gloryhound11 wrote:
Tue Apr 14, 2020 9:51 pm
Is it possible to connect 2 pi 4s to each other to effectively double the graphical and computing power?
by mikronauts
Sat Apr 04, 2020 7:04 pm
Forum: Raspberry Pi OS
Topic: GPL: getting source and commercial use
Replies: 32
Views: 1131

Re: GPL: getting source and commercial use

- tell buyer where to download raspbian, and have them install it
- package your non-gpl code as a downloadable tar with an install.sh
- now you don't have to provide sources for Raspbian as you are not distributing it
- make sure you don't have any gpl code in your tar
by mikronauts
Sun Mar 29, 2020 4:28 am
Forum: Beginners
Topic: Running multiple 2x16 lcd displays
Replies: 4
Views: 195

Re: Running multiple 2x16 lcd displays

https://www.mikronauts.com/raspberry-pi/raspberry-pi-1602-and-2004-lcd-interfacing/ runs two at the same time, easy to expand to 8 I am looking to hook up 8 2x16 lcd displays to a Pi for a poker table to show chip counts, seat name and other information during the game. is this possible? Would i nee...
by mikronauts
Fri Mar 27, 2020 4:48 pm
Forum: Troubleshooting
Topic: Servo jitter
Replies: 2
Views: 175

Re: Servo jitter

Put a scope on the power supply for the servos, and take a look at the power levels. Odds are it is caused by the monentary current requirements of the servos being more than your power supply can handle. Ofcouse it could also be poor quality servos. I need some help with servo jitter/shaking. I’m r...
by mikronauts
Mon Mar 23, 2020 8:10 pm
Forum: C/C++
Topic: How to measure time with nanosecond accuracy?
Replies: 19
Views: 1237

Re: How to measure time with nanosecond accuracy?

1ns requires counters that can count at 1GHz Specialized, expensive. As others have said time of flight equipment may work, but likely not at a price you would like. Hi, everyone. In my project, I want to measure the difference of delta-T between two event pairs. How can I get the register value whi...
by mikronauts
Thu Mar 19, 2020 12:15 am
Forum: Off topic discussion
Topic: FPGA for beginner
Replies: 11
Views: 7328

Re: FPGA for beginner

google icestick40 from lattice
by mikronauts
Mon Mar 09, 2020 2:15 pm
Forum: Automation, sensing and robotics
Topic: Sensors for system at work
Replies: 16
Views: 1093

Re: Sensors for system at work

in your original post you wanted to know if the conveyor stopped
bensimmo wrote:
Mon Mar 09, 2020 8:20 am
I thought of that, but then how would it know if there are biscuits on the conveyor or not?
It could still be moving, but not have biscuits on it. It would be fine for just conveyor movement.
by mikronauts
Sun Mar 08, 2020 11:52 pm
Forum: Automation, sensing and robotics
Topic: Sensors for system at work
Replies: 16
Views: 1093

Re: Sensors for system at work

kiss principle: sense the rotation of rollers driving the conveyor instead, either optically or hall effect sensor + magnet. Hi All. I am sorry in advance if this topic is in the wrong place. I'm working currently for a biscuit manufacture and I have an idea how I can help my company, but my leaders...
by mikronauts
Wed Feb 26, 2020 4:03 am
Forum: Beginners
Topic: Best Motor Controller
Replies: 2
Views: 214

Re: Best Motor Controller

for 1A 3..12VDC motors I would use L298 based drivers
mike6216 wrote:
Tue Feb 25, 2020 7:46 pm
What would be the best motor controller options for the raspberry to control 2 DC motors ranging from 3.5-12V with 1A each
by mikronauts
Tue Feb 25, 2020 5:07 pm
Forum: Python
Topic: MODBUS SERVER
Replies: 2
Views: 292

Re: MODBUS SERVER

https://pymodbus.readthedocs.io/en/latest/
rosario.iameo wrote:
Tue Feb 25, 2020 1:38 pm
Hi all,
i would like to develop a simple modbus Server, over RS485, with python. I have siemens PLC as master and i want write data in the holding register of server..
What is the best package to do this?

Thanks in advance!
by mikronauts
Fri Feb 21, 2020 3:41 am
Forum: General discussion
Topic: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?
Replies: 14
Views: 1957

Re: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?

I have 1+2+4 gb pi's

A 1gb 3a+ would be nice for bots.
W. H. Heydt wrote:
Thu Feb 20, 2020 7:43 pm
mikronauts wrote:
Wed Feb 19, 2020 2:20 am
I would love to see a 1Gb 3A+
Even better...you can already get a 4Gb Pi3A+. What I think you're asking for is an 8Gb (== 1GB) Pi3A+.
by mikronauts
Wed Feb 19, 2020 2:20 am
Forum: General discussion
Topic: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?
Replies: 14
Views: 1957

Re: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?

I would love to see a 1Gb 3A+ Hopefully on Pi Day (just 26 days away) there will be exciting news on a Raspberry pi 4 with 8GB RAM or a better GPU. Wishfully thinking, perhaps. However, it might be worth the wait!! The best prize is a surprise. If there is an announcement, it would be more likely to...
by mikronauts
Wed Feb 12, 2020 5:38 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: MCP3008 with 5v Sensor
Replies: 9
Views: 8858

Re: MCP3008 with 5v Sensor

see https://www.mikronauts.com/raspberry-pi/raspberry-pi-analog-to-digital-conversion-experiments-and-howto/ on the schematic you will see me running the adc at 5v and converting the MISO to 3v3 for the Pi with r35 and r36 Hello, I am working on a project for school and I'm needing to connect a 5v a...
by mikronauts
Sun Jan 26, 2020 8:27 pm
Forum: Beginners
Topic: Connecting 4 sensors to rasppi
Replies: 3
Views: 235

Re: Connecting 4 sensors to rasppi

type your descriptions (one at a time) into google For my college project i need to connect following sensors to rasppi simultaneously, 1, DHT11 temp-humidity sensor 2, Hc-sr04 Ultrasonic distance sensor 3, YF-S201 water flow sensor 4, DC 5V soil moisture sensor I searched on many tutorials but i ca...
by mikronauts
Fri Jan 24, 2020 4:17 pm
Forum: HATs and other add-ons
Topic: hat eeprom access question
Replies: 0
Views: 324

hat eeprom access question

I am starting to work on a Hat.

I understand about the ID eeprom, but I would like to know if I can safely read/write the hats eeprom (after the Pi finished booting) safely.

Will it interfere with:

1. video core
2. camera
3. pi 7" didplay
by mikronauts
Fri Jan 24, 2020 2:12 pm
Forum: General discussion
Topic: Looking for 2x20 LED matrix display
Replies: 28
Views: 3355

Re: Looking for 2x20 LED matrix display

on Ebay or Amazon, search for 8x32 led matrix (4 characters per display ) they can be cascaded. you need 10pcs for a 2x20 text display Most use Max7219 driver chips, google max7219 for a ton of sample code. Hi all, I need to find a 2x20 character LED matrix display to display simple text messages (m...
by mikronauts
Thu Jan 09, 2020 3:18 am
Forum: Troubleshooting
Topic: Poor SATA to USB HDD performance.
Replies: 22
Views: 1844

Re: Poor SATA to USB HDD performance.

reformat as ext4 Is the usb drive formatted to ntfs? Hi, I am running the raspian from SSD on Raspberry PI 4 4GB. Sometimes when watching movie in Full HD in Kodi, I have small miliseconds freezes including little crack in sound. I have also second drive connected to second USB (its 5400 rpm WD driv...
by mikronauts
Wed Jan 08, 2020 4:15 am
Forum: Troubleshooting
Topic: Poor SATA to USB HDD performance.
Replies: 22
Views: 1844

Re: Poor SATA to USB HDD performance.

Is the usb drive formatted to ntfs? Hi, I am running the raspian from SSD on Raspberry PI 4 4GB. Sometimes when watching movie in Full HD in Kodi, I have small miliseconds freezes including little crack in sound. I have also second drive connected to second USB (its 5400 rpm WD drive 1,5TB). When I ...
by mikronauts
Fri Nov 29, 2019 3:47 pm
Forum: Graphics, sound and multimedia
Topic: [Question] 8 HD screens on Rapsberry pi 4
Replies: 8
Views: 760

Re: [Question] 8 HD screens on Rapsberry pi 4

by far the easiest and cheapest is to use four rpi 4's with two displays each Thank you for your answer. I want to be able to display different video streams on each display. The goal is to have the Rpi 4 to receive 8 different video streams over the network and display them on the 8 displays. Most ...
by mikronauts
Tue Nov 26, 2019 6:00 pm
Forum: Other projects
Topic: Transmit data over long range (20+ miles)
Replies: 6
Views: 832

Re: Transmit data over long range (20+ miles)

lora may work for you https://www.electronicdesign.com/industrial-automation/11-myths-about-lorawan I am thinking of launching a weather balloon with a Raspberry Pi package. I want to be able to transmit some pictures and possibly video as well as data from a variety of sensory. GPS, temperature, pr...
by mikronauts
Sat Nov 23, 2019 6:19 pm
Forum: Automation, sensing and robotics
Topic: UART servo controller
Replies: 4
Views: 469

Re: UART servo controller

pi tx --> sc08a rx pi rx <-- resistor divider <-- sc08a tx pi gnd -- sc08a gnd provide sepate 5v (not from pi's supply) to the sc08a so servos are not driven by pi supply google resistor divider to see how to do that Hi, I'm using the SC08a servo controller to control 8 servos. The controller is dri...

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