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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: 707

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: 707

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: 8535

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: 163

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: 197

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: 2274

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: 940

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: 940

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: 622

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: 448

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: 350

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: 571

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: 571

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: 571

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: 12076

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: 2653

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: 998

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: 1458

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: 1140

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: 1140

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: 1140

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: 1140

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: 558

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: 160

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......

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