Description We have built the simplest, power-efficient and 'ready-for-solar' APRS Digipeater and iGate on an MCU (RPi Pico 2 W)! Our existing KISSLink v1 BLE KISS TNC device is capable of running in standalone mode with an alternate firmware! Goal(s): Our design prioritizes low power, reliability, and unattended deployment over flexibility. And yes, we want to do this with cheap, widely available BaoFeng radios. This means a couple of things: ...
Description We have built a Bluetooth-enabled and APRSdroid-compatible digital interface (KISS TNC) for less than 15 USD (for the fully-loaded make including cables). We call it the KISSLink v1. This digital interface can be powered from the USB 5V or the inbuilt battery. Schematic Previous Next / [pdf] View the PDF file here. RX path simulation (AF front-end) ...
Design Here is a "safe" APRS interface for BaoFeng and other radios. Sample schematic: Previous Next / [pdf] View the PDF file here. Render ...
This note demonstrates a small connectivity tester / check nets program for KiCad. This program allows doing checks like: Is the U1:8 pin connected to GND? Motivation Sometimes visual errors can creep in the schematic (and the PCB subsequently). This connectivity tester allows expressing the same connections in a non-visual way (with a different probability of making errors). The ERC and DRC checks in KiCad work great but this non-visual test assertions provide another level of sanity checking. ...