Today, we will build the LoRa-based mailbox notifier shown in video #493 from the ground up, including a gateway. The process will take us through designing a custom PCB, hardware assembly, functional testing, 3D printing enclosures, and configuring automatic discovery within Home Assistant. Throughout the project, I’ll share insights and tips from an engineer’s perspective, covering techniques that can be easily adapted for a range of other IoT projects. We’ll work with a modern ATtiny, an ESP32, and LoRa modules. My second channel: Links: Explanation video: E32 module 433MHz: E32 module 915MHz (US): ESP32 mini: (all versions should work) or Various PCB adapters: or Silicone wires: or Silicone Dupont wires: or Capacitors and Resistors in one book: Resistors alone: or Capacitors alone: or AA Battery holder: Connectors: or Reamer: or Detail video for autodiscovery: PCB: Code: Patreon supporter companies: The links above are usually affiliate links that support the channel (at no additional cost to you). Supporting Material and Blog Page: GitHub: My Patreon Page: Discord: If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission on your purchases to buy new stuff for the channel My shop: For Banggood For AliExpress: For AliExpress: (just go on from here to your product) For Amazon US: For : For Amazon UK: For : Please do not try to email me. This communication channel is reserved for my primary job As an Amazon Associate, I earn from qualifying purchases