why's it got a pencil sharpener on the top?

Because it wouldn't fit on the bottom.

What are those blue connectors for? Can I see a connecting diagram or instructions of some sort?

The blue terminal blocks are for power connections. The 3-term block is for supply voltage, ground, and +5V out from on-board regulator. Each 2-term block is for a power circuit to a motor (voltage is same as supply). A search online for "l298n driver module" images gives a lot of useful connection diagrams. ST Microelectronics provides good technical documentation for the L298 IC, itself, which describes the power limitations.

I lose the voltage from 10v to 4.5v, as soon as I connect to motor controller. Any idea why it is happening and how to correct it?

I need a bit of context for your question. are you using a microcontroller with the L298? How many motors are you using? do you have a separate power supply for said source of controls? Are you using an arduino?

Is there a way for me to detect a stall using this driver?

No, there is no feedback from the motor to the driver. Possibly monitor the current used by the motor with a Hall Effect transducer and, if it exceeds a certain value, consider it stalled.

L298n Motor Drive Controller Board Module Dual H Bridge Dc

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Description

⚙️ Drive your innovation forward with power and precision!

BUILT FOR RELIABILITY - Includes large filter capacitors and freewheeling diodes to protect your setup
DUAL H BRIDGE CONTROL - Drive two DC motors or one stepper motor simultaneously with precision
POWERHOUSE PERFORMANCE - Handles up to 35V and 3A peak current for demanding motor projects
ARDUINO READY INTEGRATION - Seamlessly compatible with Arduino for rapid prototyping and innovation
OPTIMIZED VOLTAGE MANAGEMENT - Supports external 5V logic supply to safeguard your board at higher voltages

The L298N Motor Drive Controller Board is a compact, high-efficiency dual H-bridge module designed for Arduino projects. It supports up to 35V and 3A peak current, enabling control of one or two DC motors or stepper motors with enhanced reliability through built-in capacitors and protection diodes. Ideal for makers and professionals seeking robust motor control with seamless integration.

Specifications

ASIN	B014KMHSW6
Best Sellers Rank	#1,008 in Single Board Computers (Computers & Accessories)
Customer Reviews	4.6 4.6 out of 5 stars (396)
Date First Available	October 31, 2013
Item Package Quantity	1
Item Weight	0.704 ounces
Item model number	CECOMINOD012186
Manufacturer	Qunqi
Material	ABS
Part Number	MK-050
Product Dimensions	1.14 x 0.98 x 0.75 inches
Voltage	12 volts
Wattage	25 watts

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