● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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| QTY | Unit Price(Inlc. GST) | |
| 25+ | ₹1,077.02 ₹ 912.73 + 164.29 GST | |
| 50+ | ₹1,066.03 ₹ 903.42 + 162.62 GST | |
| 75+ | ₹1,044.05 ₹ 884.79 + 159.26 GST | |
| 100+ | ₹1,033.06 ₹ 875.47 + 157.58 GST | |
A high-density version of the Arduino Mega 2560 featuring 54 Digital I/O and 16 Analogue inputs in a compact footprint. Ideal for complex robotics and industrial automation, where space is at a premium.
The Mega Pro Mini ATmega2560 is designed for engineers who need the massive I/O and memory capacity of the Arduino Mega 2560 but cannot afford the bulky footprint of the traditional board. By condensing the entire 54-pin architecture into a high-density layout, this board allows you to build industrial-grade controllers, 3D printer motherboards, and complex robotics without the "breadboard bulk."
In embedded systems, signal integrity is everything. This board is Probots™ ProSpec Grade, featuring high-quality decoupling capacitors and optimised trace routing to minimise electrical noise—critical when you are utilising all 16 analogue inputs simultaneously. Every batch is Probots™ Lab Verified in our Bangalore facility to ensure the CH340G USB-UART interface provides stable communication even during long-duration data logging sessions.
Microcontroller: ATmega2560-16AU (8-bit AVR)
Clock Speed: 16 MHz
Flash Memory: 256 KB (8 KB used by bootloader)
SRAM: 8 KB
EEPROM: 4 KB
USB-UART: CH340G (Requires standard CH340 drivers)
Digital I/O Pins: 54 (of which 15 provide PWM output)
Analogue Input Pins: 16
DC Current per I/O Pin: 20 mA
Input Voltage (Recommended): 7-12V
USB Port: Micro-USB
3D Printers & CNC: The compact size is perfect for custom RAMPS-style control boards.
Industrial PLC Emulation: With 54 pins, you can manage complex logic with dozens of relays and sensors.
Flight Controllers: Used in high-end DIY drones requiring multiple UARTs and PWM channels.
Home Automation Hubs: Large flash memory allows for complex web-server or touchscreen code.
Past Projects (Prerequisites): If you’ve mastered the Arduino Uno but find yourself constantly using I/O expanders or running out of code space, this is your next step.
Feature Upgrade: This board unlocks four hardware Serial ports (UARTs), allowing you to talk to a GPS, a Bluetooth module, and a Nextion display simultaneously without using "SoftwareSerial."
Effort Level: Intermediate. It uses the same Arduino IDE code but requires careful pin mapping due to the high-density layout.
Hardware Needed: A Micro-USB data cable and a 7V-12V DC power supply for standalone operation.
Driver Setup: Ensure you have the CH340 drivers installed. If the board isn't detected, check your USB cable; many are "Charge only" and lack data lines.
Power Rail: For stable operation of the ATmega2560, we recommend powering via the VIN pin with at least 7V if you are driving multiple sensors.
Probots™ Tech-Bridge ???? Tip: Need the specific pinout diagram for your CAD design? Our technical team has verified the dimensions and pin spacings for easy integration into your custom PCBs.
Included: 1x Mega Pro Mini ATmega2560 Board, 2x 40-Pin Header Strips (Unsoldered).
Required Additional: Micro-USB Data Cable, 12V 2A Power Adapter (for high-load projects).
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
For order related queries contact -
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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