Description
This is an "appallingly small" add-on shield for ESPea that mounts on the bottom, USB-end of the ESPea by soldering the board to the GND, 3V3. The heart of the board is the LTC4054 battery management chip by Linear Technology. The board has +/- through-hole mounting holes for a JST LiPo battery connector (supplied with the LiPo charger) and for an external DC power supply.
The swtich (SW1) can open / close the power from battery shield.
LED Status
- LED1 is led for charge. It will be off when battery is full charge
- LED2 will turn on when battery is full charge
- LED2 will turn on when device is powered by battery
- LED1 充电指示灯，电池充满LED1熄灭；
- LED2电池充满后会被点亮;
- 电池供电时LED2亮；
Technical Details
| Name | Parameters |
| Chip | LTC4054-4.2 |
| Size | 25.6mm x 34mm without headers soldered in |
| Power Connector | ph2.0-2p JST connector and 5.5mm / 2.1mm DC barrel plug |
| Charge Current | 500mA |
| Charge Voltage | 4.2V |
Note
The 5.5mm / 2.1mm DC barrel plug not soldered default.