Lithium Battery Charging Buck Converter Board (DC-DC step-down charger module). It is commonly used for charging  3S lithium batteries from a higher DC voltage source like solar panels or adapters.

• Width: 5.2 cm (~2.05 inches)
• Length: 7.7 cm (~3.03 inches)
• Type: Single-sided copper-clad laminate
• Material: FR4 (fiberglass)
• Use: Ideal for DIY electronics, prototyping, and acid etching projects.

Male to Female Jumper Wire 40 cm

2-wheel drive smart robot car chassis kit commonly used for Arduino, robotics, and educational DIY projects.

📦 Package Contents

Typical kit includes:

• 2 × DC geared motors
• 2 × Wheels
• 1 × Acrylic/wooden chassis plate
• 1 × Universal caster wheel
• Motor mounting brackets
• Screws & nuts
• Couplers/connectors

• Sensor IC: MLX90614ESF-BAA
• Type: Non-contact IR temperature sensor
• Measurement method: Infrared thermopile
• Communication: I²C (SMBus compatible) / PWM output
• Object temperature: −70 °C to +380 °C
• Ambient (sensor) temperature: −40 °C to +125 °C
• Accuracy: ±0.5 °C (typical, around 0–50 °C)
• Resolution: 0.02 °C
• ADC: 17-bit internal ADC
• Operating voltage: 3.3 V – 5 V DC
• Current consumption: ~2 mA

1. Input: 3.3V


2. Sensing range: 4 CM -10 cm


3. Field of view: 35 degrees


4. Sensor temperature: -40 to +85°C


5. 10k Pull-up resistors for the I2C interface

1. Temperature Control Range(°C): -50 to +110


2. Resolution @-9.9°C to +99.9°C: 0.1°C


3. Resolution @all temperatures: 1°C


4. Accuracy: 0.1°C


5. Refresh Rate(s): 0.5


6. Supply Voltage(V): 12


7. Measuring Inputs: NTC10K


8. Cable Length: 0.5 Meter


9. Output Type: 1 Channel Relay Output


10. Capacity: 10A

Gy-91 Mpu-9250 (Bmp 280)

DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability.Its sensing elements is connected with 8-bit single-chip computer. Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite coefficient from memory. Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of harsh application occasions.b

High-capacitance polarized capacitor used for power supply filtering, voltage smoothing, and energy storage in low-voltage electronic circuits. Commonly used in motherboards, audio circuits, DC power supplies, and embedded systems. Must be connected with correct polarity to avoid damage

Capacitance: 120 microfarads (120µF)
Rated Voltage: 400V DC
Type: Electrolytic Capacitor (Polarized – has positive and negative terminals)
Application: Used in power supplies, motor drives, inverter circuits, SMPS, amplifier circuits, and other high-voltage DC applications
Features: High capacitance, compact size, voltage filtering, and energy storage
Important Note: Must be connected with correct polarity; reverse connection may cause damage or explosion

18×30, 2.54mm green matrix board is a general-purpose PCB with 18 rows and 30 columns of holes, spaced at standard 2.54mm pitch. It is ideal for soldering electronic components, prototyping circuits, and DIY projects. The board is durable, easy to use, and compatible with most through-hole components.”
If you want a shorter version for posting:
“18×30 holes, 2.54mm pitch green matrix PCB, perfect for DIY electronics and circuit prototyping.”