• Programmable Charge Current:Up to 1000mA
• Constant-Current/Constant-Voltage
• Types of battery:Single-cell Li-Ion or Li-Polymer batteries
• Interface
  • Charge from Micro USB
  • JST-type or terminal connect to battey     
• With ON/OFF switch,3 status LEDs      
• Accuracy:1.5% @ Preset 4.2V Charge Voltage  
• C/10 Charge Termination
• Operating Ambient Temperature：-40℃～85℃
• Size:3.2x2.7x1cm(1.26"x1.06"x0.39") 

• Gravity: I2C BMI160 6-Axis Inertial Motion Sensor
• Beetle - The Smallest Arduino
• 3.7v lithium battery charger
• 3.7v lithium battery
• 10 piranha lamp beads
• A small amount of acrylic pigment (green, yellow, blue and brown; if gray and white pigment is provided, the oil paint does not need to be prepared)
• Light gray and white oil paint
• A good-looking 2-foot button (I bought it on Taobao)
• Lead wire (2 mm) (If no, replace it with soft iron wire)
• 40 cm PVC hollow rod (I use the one with outer diameter 9 mm and inner diameter 5 mm)
• A screw and nut with the length of 20mm

Project 2. How To Make A Smart Clock with ESP32?

I’ve always been dreaming of making a desktop clock which without complex functions, just smaller and can display time.

Hardware:

• Gravity I2C OLED-2864 Display
• Gravity: I2C Triple Axis Accelerometer
• Beetle BLE - The smallest Arduino bluetooth 
• Lithium Battery Charger
• 3.7V Polymer Lithium Ion Battery - 1000mA
• Shell (3D printing)
• Black Acrylic Transparent Board

1. Gravity: Analog EMG Sensor by OYMotion   ×1
2. Beetle - The Smallest Arduino       ×1
3. Lithium Battery Charger         ×1
4. 3.7 V Lithium Battery        ×1
5. 9g 180° Micro Servo   ×2
6. Rabbit Hat   ×1
7. Needles and Thread
8. Two-step Toggle Switch  ×1
9. Elastic (Width: 1.5cm Length: 40cm) ×1
10. Stick ×2
11. Hot Melt Adhesive

• Microbit *2
• micro:bit Expansion Board for Boson (Gravity Compatible) *1
• Digital RGB LED Strip 180 LED - (3m)(weatherproof) *1
• 3.7V battery *2
• Lithium battery charger *1

• TP4056 datasheet
• Schematic

• Lithium Battery Charge x1