STM8 Router UPS (Arduino IDE + ST-Link V2)

This repo now uses Arduino IDE workflow for STM8S boards.

Firmware File

• Main sketch: arduino_lipo_charger.ino

Features

• Mains adapter detection
• Battery voltage monitoring with ADC divider
• Boost enable control for backup mode
• Low-battery cutoff with hysteresis
• Status LED and buzzer alert

Hardware Assumption

• MCU: STM8S103F3 (or compatible STM8S board)
• Programmer: ST-Link V2
• Power stage: 2S Li-ion + 2S BMS + 8.4V charger + 12V boost

Arduino IDE Setup

1. Install Arduino IDE 2.x.
2. Open File -> Preferences.
3. Add this Boards Manager URL: https://raw.githubusercontent.com/tenbaht/sduino/master/package_sduino_stm8_index.json
4. Open Tools -> Board -> Boards Manager, install STM8 core package.
5. Open sketch file arduino_lipo_charger.ino.
6. In Tools, select your STM8 board (example: STM8S103F3P6).
7. Select programmer as ST-Link V2 (name may appear as STLink, STLinkV2, or similar).
8. Use Sketch -> Upload Using Programmer (Ctrl+Shift+U).

ST-Link Wiring

• ST-Link SWIM -> STM8 SWIM
• ST-Link GND -> STM8 GND
• ST-Link 3V3/5V -> target VCC (as required by board)
• Optional: ST-Link RST -> STM8 NRST

Pin Mapping In Sketch

• PB4: mains detect input
• PD3: boost enable / Q3 gate driver control
• PD4: buzzer output
• PC5: status LED output
• A2 or PD2: battery ADC input

If your board mapping differs, edit pin constants at the top of arduino_lipo_charger.ino.

Threshold Tuning

Edit values in sketch:

• BATT_CUTOFF_MV (default 6400)
• BATT_RECOVER_MV (default 7000)
• LOOP_DELAY_MS