Go to advanced search

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: 319

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: 5
Views: 225

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: 177

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...
by mikronauts
Fri Nov 15, 2019 10:48 pm
Forum: General discussion
Topic: LCD GPIO Interface
Replies: 12
Views: 359

Re: LCD GPIO Interface

dpi24 is the driver hdmi_cvt is similar to an x configuration mode line basically you need electrically matching lcd's that can be configured via the dtoverlay dpi24 dpi_* and hdmi_cvt variables. When you say "driver" I guess I'm thinking of drivers in the traditional sense. And the RGB LCD HAT scen...
by mikronauts
Fri Nov 15, 2019 5:51 pm
Forum: General discussion
Topic: LCD GPIO Interface
Replies: 12
Views: 359

Re: LCD GPIO Interface

you are correct it does not look like gertvga but electrically it has to work in a similar manner basically any lcd that matches the fpc pinout that the driver can support should work, as this board drives the panels directly instead of using resistors to generate an analog vga signal I would expect...
by mikronauts
Fri Nov 15, 2019 4:10 pm
Forum: General discussion
Topic: LCD GPIO Interface
Replies: 12
Views: 359

Re: LCD GPIO Interface

try googling gert vga, this looks like a clone of it
by mikronauts
Mon Oct 28, 2019 10:10 pm
Forum: HATs and other add-ons
Topic: Anybody interested in talking direct! to IDE/SATA?
Replies: 31
Views: 11169

Re: Anybody interested in talking direct! to IDE/SATA?

if you can make a pointer for the smi window base address, it should be much faster than using a kernel function for each access After some problems, I have been able to compile the original source code from Gert on my 3B+. First of all, I have found an issue in the original code which prevents it t...
by mikronauts
Thu Oct 24, 2019 1:35 am
Forum: Troubleshooting
Topic: Recourse for probable defective unit
Replies: 35
Views: 2171

Re: Recourse for probable defective unit

try underclocking the memory, gpu and cpu say run everything at 1/2 of normal clock speed if it fixes the issue, restore the normal clock one subsystem at a time I'm a long-time and loyal Raspberry Pi user having owned every model ever issued but have never encountered a problem that I hadn't caused...
by mikronauts
Wed Oct 23, 2019 1:25 pm
Forum: Beginners
Topic: Strategy to use Rpi for 24 hours HQ video recording
Replies: 15
Views: 816

Re: Strategy to use Rpi for 24 hours HQ video recording

Why does traffic analysis need to read and store the license plates? Is this a commercial/industrial/college situation or just a home learning exercise? Hello Neilgl This is actually for a scientific research project for traffic analysis being carried out in a central government organization where I...
by mikronauts
Tue Oct 22, 2019 11:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C Issues w/ SAMD51 microcontroller
Replies: 4
Views: 1166

Re: I2C Issues w/ SAMD51 microcontroller

Use a logic analyzer to see what is happening.

It might be a clock stretching issue.
by mikronauts
Mon Oct 14, 2019 3:31 pm
Forum: General discussion
Topic: How to use nRF24 via CH340T serial-to-USB converter?
Replies: 14
Views: 929

Re: How to use nRF24 via CH340T serial-to-USB converter?

That would do it... the original post only mentioned the chg340 and nrf25l01, which without a uc would be an issue. spi requires a clock signal, which is NOT available on a serial port. If you look carefully at the link the OP posted, it looks like there's a pre-programmed PIC18F on there. That woul...
by mikronauts
Mon Oct 14, 2019 1:24 pm
Forum: General discussion
Topic: How to use nRF24 via CH340T serial-to-USB converter?
Replies: 14
Views: 929

Re: How to use nRF24 via CH340T serial-to-USB converter?

if the board provides a microcontroller in addition to the chg340 usb to serial chip, it could be programmed (my first email suggested using an arduino) to do the serial to spi conversion LOL - too much disinformation floating here... spi requires a clock signal, which is NOT available on a serial p...
by mikronauts
Sun Oct 13, 2019 6:17 pm
Forum: General discussion
Topic: How to use nRF24 via CH340T serial-to-USB converter?
Replies: 14
Views: 929

Re: How to use nRF24 via CH340T serial-to-USB converter?

spi requires a clock signal, which is NOT available on a serial port. Huh - my previous post has gone missing. Never mind - gist was as following: I think (*think*) serial here is used instead of SPI - actually adapter sends everything it received from serial to SPI relaying back all (in turn) recei...
by mikronauts
Sun Oct 13, 2019 1:22 pm
Forum: General discussion
Topic: How to use nRF24 via CH340T serial-to-USB converter?
Replies: 14
Views: 929

Re: How to use nRF24 via CH340T serial-to-USB converter?

The nrf24l01 requires an spi port. The chg340 usb to serial adapter does not provide an spi port. Use an arduino as a usb to spi adapter, you can write code for that. Note that there are some ftdi usb to spi adapters. @clicky Thanks for your response, and I understand that it works through GPIO. The...
by mikronauts
Mon Oct 07, 2019 9:44 pm
Forum: Troubleshooting
Topic: Power Issues w/ 6 AA Batteries through Buck Converter Powering the Pi3B+
Replies: 8
Views: 396

Re: Power Issues w/ 6 AA Batteries through Buck Converter Powering the Pi3B+

using 6x rechargable AA to power the Pi and the motors is asking .. no, begging, for trouble. use the AA's for the motors, and a usb powerbank with a 2A output for your Pi Really appreciate your feedback, this is incredibly helpful! This is my first Raspberry Pi project and I am still figuring thing...
by mikronauts
Tue Sep 17, 2019 9:44 pm
Forum: Beginners
Topic: Read data from RPi using a RFID reader (RPi as a RFID tag)
Replies: 2
Views: 104

Re: Read data from RPi using a RFID reader (RPi as a RFID tag)

program a fob? TLDR: how to turn RPi into an RFID Tag (NOT reader) Hi all, I know it's possible to read RFID cards/tags using MFRC-522 or similar. But what I need is to expose information (example: public SSH) key using RFID for a small IoT project of mine (effectively turning Pi into an RFID tag......
by mikronauts
Sat Sep 14, 2019 10:33 pm
Forum: Automation, sensing and robotics
Topic: Proyect: Autonomous robot with a rechargeable batteries
Replies: 4
Views: 569

Re: Proyect: Autonomous robot with a rechargeable batteries

You really should use independent batteries for the Pi and the motors.
Brownouts often corrupt the sd cards.
by mikronauts
Fri Sep 06, 2019 1:14 am
Forum: Python
Topic: Data input from an A/V cable
Replies: 11
Views: 785

Re: Data input from an A/V cable)

The Pi does not have av inputs.

Depending on what you want to do you may find a compatible usb video capture stick.
by mikronauts
Wed Sep 04, 2019 6:48 pm
Forum: Beginners
Topic: raspberry pi 4 and wine or x86 emulator
Replies: 23
Views: 2426

Re: raspberry pi 4 and wine or x86 emulator

Try a cheap windows tablet.
by mikronauts
Sun Sep 01, 2019 4:24 pm
Forum: Troubleshooting
Topic: RPI4 Poor Network Speeds
Replies: 16
Views: 783

Re: RPI4 Poor Network Speeds

Yes, but ntfs is one of the first things to check. Check your wired network to make sure your pi is connected at 1000mbps. Check samba tuning parameters, and make surd your switch supports jumbo frames. Make sure the drives are not using ntfs. No, all drives are formatted as Ext4. But if the drive f...
by mikronauts
Sun Sep 01, 2019 2:27 pm
Forum: Troubleshooting
Topic: RPI4 Poor Network Speeds
Replies: 16
Views: 783

Re: RPI4 Poor Network Speeds

Make sure the drives are not using ntfs.
by mikronauts
Tue Aug 27, 2019 2:44 pm
Forum: Beginners
Topic: Code for multiple ultrasonic sensors ROS related
Replies: 2
Views: 172

Re: Code for multiple ultrasonic sensors ROS related

You can only trigger one at a time if you expect usable result as all the triggered sensors can pick up the echo from the closes object. Hi, I have 7 ultrasound sensors (hc-sr04) on my robot wired on the raspberry pi. I wanted to write a node that would first trigger only 4 of them and publish each ...
by mikronauts
Sat Aug 24, 2019 9:31 pm
Forum: Troubleshooting
Topic: [SOLVED] PI4 USB3 Port and Logitech Keyboard Wireless Range
Replies: 13
Views: 487

Re: PI4 USB3 Port and Logitech Keyboard Wireless Range

Why on earth would you waste a usb3 port on a keyboard dongle??? So I've been setting up my new PI4 and loving many of the features. Most things working well but not my Logitech wireless keyboard :cry: I've used it with all versions of Pis over the years and no problems but now the range is really p...
by mikronauts
Tue Aug 20, 2019 1:51 pm
Forum: Networking and servers
Topic: Fast reading, very slow writing - rpi 4, samba, external USB 3.0 HDD
Replies: 3
Views: 781

Re: Fast reading, very slow writing - rpi 4, samba, external USB 3.0 HDD

Ext4 or ntfs? Ntfs is known to be slow on a Pi. Hey guys, so I'm trying to set up my new raspberry pi 4 with an external hdd usb 3.0 with samba in raspbian. The thing is it's giving me great speeds for reading, but really slow and unreliable write speeds. Speeds: https://imgur.com/a/E59rMhs Things I...
by mikronauts
Thu Aug 15, 2019 12:37 pm
Forum: Troubleshooting
Topic: Four dead Pis in one class!?
Replies: 15
Views: 1036

Re: Four dead Pis in one class!?

Sorry to hear about your problems, however you REALLY should be using different battery packs for powering the Pi and the motors (as others have mentioned) I've built dozens of bots, and have not fried a Pi yet. I'm a relatively new raspberry pi educator (I was fortunate enough to get to go to a Pic...

Go to advanced search