PN7120 does not respond on the I2C bus

From www.jsykora.info 5 years ago in Blogs

NXP’s PN7120 is NFC controller for contactless communication at 13.56MHz. It interfaces with the host CPU via the I2C bus. The I2C slave address of PN7120 is 0b010100Lx, where L is a configurable LSB of the address (by pin B2, I2CADDR0), and x is the standard I2C R/W bit. Hence...

Articles from Jara’s Spare Time Electronics

Initial release of mywayback

From www.jsykora.info 2 years ago in Blogs

Mywayback is a complete rewrite of my previous timeback archival tool. It is now available on the github: https://github.com/jsyk/mywayback Main features: Python 3.x in Windows (with NTFS-only) and Linux. Requires the package sortedcontainers. Automatic deduplication of source files using SHA256…...

Engineers’ Tribute, and a handy wire gauge chart by PEI-Genesis

From www.jsykora.info 3 years ago in Blogs

Engineers’ Tribute is an endless well of electronic technology sites, perfectly suited for studying during long winter evenings (or lockdowns.. 🙂 ) Checkout this handy wire-gauge chart made by PEI-Genesis. The download link is right at their front page:

Premonitions from 2019

From www.jsykora.info 3 years ago in Blogs

Bad sleep last night brought me ideas, and since we’ve got a situation down here in Siemens, the topic was not unexpected: CRISIS STARTSAS UBER FALLS. and NO CORRECTIONBEFORE TRUMP’SRE-ELECTION. Let time travelers from 2020 and beyond let us know…...

Release of the VFD-Watch V2.1

From www.jsykora.info 3 years ago in Blogs

The VFD-Watch project is now released in version V2.1. Enjoy!

Koupě domu v ulici Ant. Škváry, majitel Martin Zuna, Lysolaje

From www.jsykora.info 4 years ago in Blogs

Tato stránka dokumentuje jednu z nemovitostí, u kterých jsem projevil vážný zájem o jejich koupi. Postupně zde bude popsán průběh vyjednávání s RK a s majitelem. Rohový řadový rodinný dům stojí v ulici Antonína Škváry 1041, Kladno. Současným majitelem (LV…...

ATtiny’s UPDI interface activates permanently upon noise input!?

From www.jsykora.info 4 years ago in Blogs

UPDI – Unified Program and Debug Interface – is the new programming and debugging interface on new ATtiny MCUs from Microchip. The UPDI requires just a single pin on the MCU, so it is very suitable for low-pin count chips.…...

Inexpensive Adafruit SMT Breakout boards (SOIC, TSSOP, MSOP) from a PCB Panel

From www.jsykora.info 4 years ago in Blogs

I created a smal 100x100mm PCB mini-panel of some of the SMT breakout boards from Adafruit. Each mini-panel contains: 3x SOIC-20 (A-side) and TSSOP-20 (B-side) 5x SOIC-16 (A-side) and TSSOP-16 (B-side) 5x SOIC-8 (A-side) and MSOP-8 (B-side) 4x SOIC-8 (A-side)…...

Project of a Curve Tracer Released!

From www.jsykora.info 4 years ago in Blogs

I have finished & released my build of the Analog Curve Tracer. Complete design is available on the permanent page in the Project menu above.

Cheap AVR UPDI Programmer from ATtiny817 Xplained Mini

From www.jsykora.info 4 years ago in Blogs

New AVR processors from Microchip/Atmel use a 1-wire UPDI interface for flash programming. You could use either AVR ICE or Pickit 4 as the “official” programmers (I did not test any of them). Both of these cost >50 EUR. A…...

The Tale of a GCC Upgrade

From www.jsykora.info 5 years ago in Blogs

Once upon a time, I decided it is a good time to upgrade the version of gcc compiler we use in our ARM926-based firmware project. Historically, this project uses gcc version 4.6, which is quite outdated nowadays (January 2018). In...