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technical notes

Emscripten – GUI in Web

Emscripten compiles C/C++ code to JavaScript, which can be then run in browser. This is at it’s best for graphic applications requiring access to rendering pipeline and need to be opened in browser on any hardware, including Android. https://www.starbreak.com/ gives

pekkalehtikoski May 7, 2021May 7, 2021 technical notes Read more

PlatformIO is great

Writing portable microcontroller libraries is hard. The first issue that I run into is that it is hard to set up a toolchain and debugger for a specific microcontroller to run builds from the command line. Possible, but takes a

pekkalehtikoski May 18, 2020May 18, 2020 technical notes Read more

ESP32: 1 MHz clock signal to output pin

code /* Example: Generate 1 MHz clock signal with ESP32, note 24.3.2020/pekka ESP32: LEDC peripheral can be used to generate clock signals between 40 MHz (half of APB clock) and approximately 0.001 Hz. Please check the LEDC chapter in Technical

pekkalehtikoski March 25, 2020April 4, 2020 technical notes Read more

Configuring micro-controller WiFi with Android phone’s LED flash

Introduction The “Gazerbeam” library enables configuring micro controller’s Wi-Fi network name (SSID) and password (PSK) using a LED flash of Android phone, etc. The phone needs APP to blink configuration information, the example Android Java application named “blinky”. A phototransistor

pekkalehtikoski March 19, 2020July 30, 2020 technical notes Read more
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