# Wireless Tracker Hardware Update Log

## V1.0
**Release Date:** June 30, 2023

- First release
- Initial public sale
- [Schematic diagram](https://resource.heltec.cn/download/Wireless_Tracker/Wireless_Tacker1.0/HTIT-Tracker_V0.3.pdf)
- [Datasheet](https://resource.heltec.cn/download/Wireless_Tracker/Wireless%20tracke.pdf)

---

## V1.1
**Release Date:** Late 2023

### Changes:
- **Fixed:** Power loss issue affecting the GNSS module during LoRa operation
- **Enhanced:** Low-power functionality
- **Added:** Additional LDO to supply power to the UC6580 GNSS module independently
- **Changed:** GNSS control pin removed; GPIO 3 set to `HIGH` enables GNSS power

### Key Differences from V1.0:

| Feature | V1.0 | V1.1 |
|---------|------|------|
| GNSS Power | Shared rail | Dedicated LDO |
| GNSS Control | N/A | GPIO3 |
| Power Isolation | Limited | Improved |
| Low Power Mode | Basic | Enhanced |

### Documentation:
- [Schematic diagram](https://resource.heltec.cn/download/Wireless_Tracker/Wireless_Tacker1.1)
- [Datasheet](https://resource.heltec.cn/download/Wireless_Tracker/Wireless%20Tracker%201.1.pdf)

---

## Hardware Version Detection

To determine your hardware version programmatically:

```cpp
// V1.1 requires GPIO3 HIGH to enable GNSS
#define GNSS_CTRL_PIN 3

void setup() {
    // For V1.1 hardware - enable GNSS power
    pinMode(GNSS_CTRL_PIN, OUTPUT);
    digitalWrite(GNSS_CTRL_PIN, HIGH);
}
```