ESP32 port of libssh
Submitted by Ewan on
After significant and long-standing demand, I am porting the libssh library to the ESP32 system-on-chip as an Arduino library.
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Featured
Migrate/Upgrade Ubuntu 18.04 LTS (Bionic Beaver) GNU/Linux from 32 bit to 64 bit HowTo
Submitted by Ewan on
Sorry, no more upgrades for this system There will not be any further Ubuntu releases for this system's 'i386' architecture. Updates for Ubuntu 18.04 will continue until April 2023.
This guide is for you if you've seen the above message and you want to upgrade your Ubuntu system to 20.04 LTS.
This brief HOWTO shows how to take a working 32 bit 18.04 installation and convert it into a 64 bit system. You will be able to keep all your programs, settings and data. Once converted to 64 bit you can plan the upgrade to 20.04 LTS.
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Replace 16x02 16*02 1602 LCD with 128x32 OLED (Arduino library driver)
Submitted by Ewan on
OLED 16x02 16*02 1602 Arduino library driver for 128x32 pixel displays is attached below. Upgrade your projects to use OLED technology with minimal effort or changes.
Use EEPROM and other memory on Arduino with wear leveling
Submitted by Ewan on
Here is an Arduino library allowing you to write to all flash or EEPROM space with wear leveling. The library already supports multiple memory types (internal EEPROM, I2C and SPI) and can be extended very easily to support others. The memory space can be used as a space to store configuration data with wear leveling, or to read and write (at the same time) sensor data filling the whole memory space efficiently.
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Add another hardware serial port to Arduino (MAX3100 library)
Submitted by Ewan on
A complete Arduino library for the MAX3100 serial UART/USART chip can be downloaded below. There have been many requests for an Arduino library for the MAX3100 external serial USART (UART) chip from Maxim Integrated. As an example of the minor changes needed to use the MAX3100's serial port instead of (or in addition to) the built in serial port, here is some sample code (note the lower case 's' is the only change needed to use the new serial port).
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Arduino on breadboard (ATMEGA328P 8MHz and 1MHz)
Submitted by Ewan on
A one stop shop for using the ATMEGA328P standalone at 8MHz or 1MHz clock speed including compiled bootloader. This is for use primarily on a breadboard, but also also directly on, say, a Uno R3 or Nano.
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SN74HC595 shift register simulation directly in Arduino
Submitted by Ewan on
There exists little practical information assisting with the experimentation of '595 shift registers. This article and below Arduino sketch aim to address this vacuum. The sketch simulates one or more (chained) 595 shift registers on the serial monitor while simultaneously driving the IC or ICs via the Arduino's pins. This allows concurrent theoretical and practical experimentation with the 74HC595 first-in-first-out (FIFO) shift register family.
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QGIS stylesheets for OpenStreetMap
Submitted by Ewan on
Ready-made QGIS stylesheets (QML) for OpenStreetMap are available for download. These were created and tested with QGIS version 2.2 on Debian GNU/Linux 7.
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Places:
Presenting Ordnance Survey Meridian 2 data in QGIS
Submitted by Ewan on
Below are QGIS QML stylesheets for OS OpenData Meridian 2 layers. Ordnance Survey data has been available for a while for download as OS OpenData. Also provided are SLDs for ESRI. However these SLDs do not import correctly into QGIS.
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Large file synchronization
Submitted by Ewan on
Efficiently synchronize copies of a large sparse file locally. I deal with a large amount of large sparse files because of virtualization and other technologies. Because of their size, often a small number of blocks have data and, of these, a small number of blocks are changed and need to be backed up. Using a log-based (snapshotting) file system on USB 2 as a backup device, I only want to write blocks if absolutely necessary.
So what's the solution? Some simple custom code that
- checks that both file sizes are identical;
- verifies that some metadata has changed (i.e time stamp, permissions or owner/group);
- reads both files block-by-block;
- writes only changed blocks to the destination file, and
- updates any changed metadata.
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Technology
Multi-user on Doogee X6
Submitted by Ewan on
The relatively new Android mobile cell phone from Doogee called the X6 has its multiple user account capability disabled. The operating system is an old and non-standard Lollipop 5.1 Android, but the multi-user option should still be enabled in a phone of this operating system release. Below are a few simple steps to enable it. A prerequisite is installation of the Android Debug Bridge (ADB)
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Regional
Chelmsford winter beer festival 2016
Submitted by Ewan on
The dates have been set for the Chelmsford winter beer festival 2016. It starts at 12pm on Wednesday 17th of February and finishes at 11pm on Saturday 20th February. The same as last year, the event will be held at King Edward VI Grammar School, Broomfield Road, Chelmsford, Essex CM1 3SX.
Please read on or see the official CAMRA site for further information.
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ESP32 port of libssh
Post date: Mon, 2020-12-28 18:04
Classifications: Arduino, ESP32, C, Networking
Migrate/Upgrade Ubuntu 18.04 LTS (Bionic Beaver) GNU/Linux from 32 bit to 64 bit HowTo
Post date: Sat, 2020-05-16 17:59
Classifications: Ubuntu
Replace 16x02 16*02 1602 LCD with 128x32 OLED (Arduino library driver)
Post date: Mon, 2016-09-19 13:21
Classifications: Arduino, Hardware
Use EEPROM and other memory on Arduino with wear leveling
Post date: Wed, 2016-08-31 12:57
Classifications: Arduino
Add another hardware serial port to Arduino (MAX3100 library)
Post date: Sun, 2016-07-24 18:48
Classifications: Arduino
Arduino on breadboard (ATMEGA328P 8MHz and 1MHz)
Post date: Thu, 2016-07-21 14:19
Classifications: Arduino
SN74HC595 shift register simulation directly in Arduino
Post date: Sat, 2016-05-28 01:07
Classifications: Arduino
Presenting Ordnance Survey Meridian 2 data in QGIS
Post date: Thu, 2014-03-06 18:23
Classifications: Geospatial
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