Microcontroller projects
LoRa key running on a single coin cell
last updated: 2024-02-26
more coming soon :)
Introduction
Burning the bootloader and programming the chip
Everything is explained in the tips and tricks section.
Burning the bootloader
| Name | Arduino Uno ISP | Arduino Uno Header | ATmega328PB (TQFP_32) |
|---|---|---|---|
| MOSI | 4 | 11 | 15 |
| MISO | 1 | 12 | 16 |
| SCK | 3 | 13 | 17 |
| Reset (CS) | 5 | 10 | 29 |
| 3V (5V) | 2 | 3V3 (5V) | 4 |
| GND | 6 | GND | 5 |
As I had problems by using the ISP header (wrong chip signature) I would recommend to use the normal header!
Programming with Arduino
| USB to Serial cable (FTDI) | ATmega328PB (TQFP_32) |
|---|---|
| RTS (green) | 29 (Reset) |
| RxD (yellow) | 31 (TxD) |
| TxD (orange) | 30 (RxD) |
| 3V (5V) | 3V Battery + |
| GND | 3V Battery - |
Circuit
KiCAD
To stabilise the ADC readings a second capacitor of 100nF should be soldered in parallel to R2 (C2 = 100nF // to R2)
