Android/iOS: If you want to control a Raspberry Pi or Arduino connected device from your phone, you’d usually need to know at least some programming. Blynk is an app that makes it easier to ...

– Download the Blynk app on your smartphone and create an account. – Create a new project, select from the list your hardware (Raspberry Pi 3). – Select connection type (Wifi,Bluetooth…).

Blynk libraries currently support USB, Ethernet Shield, WiFi shield, Arduino with Ethernet, Arduino YUN, Raspberry Pi via the Pi GPIOs, and other Arduino compatible shields and boards. Support for ...

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.