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https://midbar-official-website.netlify.app/
Attention: The latest ESP32 version of Midbar compiles successfully in Arduino IDE 1.8.9 with ESP32 package v2.0.8. There might be compatibility issues with other versions of the ESP32 package for Arduino IDE.
STM32F401CCU6 + Arduino Uno Version V1.0: https://www.instructables.com/Midbar-STM32F401CCU6-Arduino-Uno-Version/
RTL8720DN + Arduino...
The KhadashPay project is an open-source payment system.
...As for the customers of the store where the KhadashPay is deployed, Khadash pay doesn't keep any logs whatsoever and doesn't require a bit of your personal information to create an account.
You can find the tutorials here:
V2.0 (ESP32 Version): https://www.instructables.com/KhadashPay-V20/
V2.0 (Raspberry Pi Pico Version): https://www.instructables.com/KhadashPay-V20-Raspberry-Pi-Pico-Version/
V3.0 (STM32F401CCU6 Version): https://www.instructables.com/KhadashPay-V30-STM32F401CCU6-Version/
V3.0 (ESP32 Version): https://www.instructables.com/KhadashPay-V30/
V3.5 (ESP32 Version): https://www.instructables.com/KhadashPay-V35/
The version of the KhadashPay that stores the data in the cloud and allows you to operate several payment terminals is available on https://sourceforge.net/projects/khadashpay-firebase-edition/
A small C/C++ projects that renders a cellular automaton (Conway's game of life) on an 128x64 Pixel Oled display (SSD1306 controller).
The project can be used as tutorial or template for the Pico C/C++ SDK and for benchmarking that controller.