Is there a library which contains the python code on how to communicate with this device?

For this product, we only have library for Arduino https://github.com/CytronTechnologies/CytronMotorDriver. However, we have made a tutorial for a similar motor driver (1Amp dual channel) using the phtyon code https://tutorial.cytron.io/2019/03/06/getting-started-with-maker-drive-and-raspberry-pi/. Please check if it helps.

Why is there an asterisk for the direction? from the graph does it not say that if you set dir to high then it goes forward and low then it goes back

Forward or backward is just a representation. Actual direction is depending on the motor connection. i.e. reverse the motor's wire terminals at the board (MA & MB) will reverse the motor spinning direction. Thank you.

I see that you have a arduino library, has it been tested or work with esp8266 or esp32?

Although we are not tested on esp8266 or esp32, but it is compatible. Just make sure the correct pin for PWM and DIR is selected

Does this board have diodes (for reverse current) to take care of back emf from the dc motor?

The MOSFET already has the diodes built-in. This motor driver is a regenerative motor driver and the energy generated by the motor during deceleration will be pumped back to the power source. Make sure a rechargeable batteries is used to power the motor driver so that it can absorb this regenerative energy.

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Cytron 20Amp Bi-Directional 6V-30V DC Motor Driver Speed Controller 60A Peak

Product ID: 118008162

Details

Brand
Cytron
Color
Black
Material
Plastic
Plant or Animal Product Type
plant
Recommended Uses For Product
Automation

⚡20A continuous current

🔄Bi-directional motor control

🌡️Temperature & undervoltage protection

Description

⚙️ Drive your projects forward with power and precision!

PLUG PLAY TESTING - Onboard buttons and LEDs let you test motor output instantly—no host needed.
BUILT IN SAFETY FIRST - Active current limiting, temperature protection, and undervoltage shutdown keep your system safe and reliable.
POWERHOUSE PERFORMANCE - Handles 20A continuous and surges up to 60A peak for unstoppable motor drive.
UNIVERSAL COMPATIBILITY - Works flawlessly with Arduino, Raspberry Pi, PLCs, and logic levels from 1.8V to 12V.
SEAMLESS BI DIRECTIONAL CONTROL - Effortlessly reverse motor direction with precision PWM and DIR inputs.

The Cytron 20Amp Bi-Directional Motor Driver supports 6V to 30V brushed DC motors with continuous 20A and peak 60A current. Featuring NMOS H-Bridge design, it offers bidirectional control via PWM and DIR inputs compatible with a wide range of controllers. Integrated safety features include overcurrent limiting, temperature protection, and undervoltage shutdown, plus onboard test buttons and LEDs for quick diagnostics—ideal for robotics, automation, and high-power motor applications.

Specifications

ASIN	B07NP6XNPR
Best Sellers Rank	#391,353 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #419 in Motor Speed Controllers #2,124 in Tool Sets (Tools & Home Improvement)
Customer Reviews	4.9 4.9 out of 5 stars (23)
Date First Available	February 12, 2019
Manufacturer	Cytron

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