I have code that has been working for a long time. It uses hardware SPI to communicate with a couple devices. After updating from Arduino IDE 2.0.4 to Arduino IDE 2.1.0, hardware SPI no longer works.

There will be multiple devices connected at the end but while testing the sensor, it is the only device connected using SPI lines, GPIO 10 for SS and, GPIO 7 for enable Using the Arduino IDE with ESP ...

An automatic toll gate system using Arduino revolutionises traditional toll collection by eliminating manual intervention.

While the Raspberry Pi has very good support for an I2C bus, a lot of very cool chips – including the in system programmer for just about every ATtiny and ATmega microcontroller – use an SPI bus.

With hundreds of Arduino shields available for any imaginable application, it’s a shame they can’t be used with the Raspberry Pi. Breaking out the Raspi GPIO pins to Arduino-compatible headers would ...