Seeeduino V4.2(ATMega328P)


Seeeduino V4.2 is an Arduino-compatible board, which is based on ATmega328P MCU, Arduino UNO bootloader, and with an ATMEGA16U2 as a UART-to-USB converter. The three on-board Grove interface can make your board connect to over 300 Grove modules. 

In stock



  • ATmega328P microcontroller

  • Arduino UNO bootloader

  • 14 Digital I/O Pins (6 PWM outputs)

  • 6 Analog Inputs

  • ISP Header

  • Arduino UNO-R3 Shield Compatible

  • Micro USB programming and power supply

  • 3 on-board Grove connectors

  • 3.3/5V system operation power switch


Seeeduino V4.2 is an Arduino-compatible board, which is based on ATmga328P MCU. There're so many Arduinos and Arduino-compatible boards in the world, and we think that Seeeduino V4.2 is one of the best Arduino boards. Seeeduino V4.2 is much more stable and easy-to-use with our special red design for Seeeduino family

Seeeduino V4.2 is based on the Arduino UNO bootloader, and with an ATMEGA16U2 as a UART-to-USB converter, which means that the board can basically work like an FTDI chip. You can program the board via a micro-USB cable. Also, you can power the board via a DC Jack input, 7 to 15V is acceptable. There's a switch to choose the system supply voltage, 3.3V or 5V, which is very useful if you want to set the system to 3.3V to save power.

We have dedicated our time to help you get started with this sensor quickly and easily. Try the step-by-step example code to quickly get started with clear codes. We also collected 20 Awesome Arduino Projects in the community to help you get started if you do not know what to do with Seeeduino V4.2  when you first get it in hands. 

Grove makes it easier to connect, experiment, and simplify the prototyping process. No jumpers or soldering required. We have developed more than 300 Grove modules, covering a wide range of applications that can fulfill a variety of needs. Not only are these open hardware, but we also have open-source software. 

Finally, please also check Arduino Boards Selection Guide to compare processor, operating voltage, input voltage, clock speed, digital I/O, PWM, analog inputs, UART, Grove connectors, flash memory, and USB connectors for different Arduino boards!


Operating the chip at 16 MHz with 3.3 volts is beyond the specified maximum frequency "Safe Operating Area" for the ATmga328P chip. So when you switch the working voltage to 3.3V, it may not be safe. However, at room temperature, most chips work fine that way.

Technical details

Dimensions 115mm x78mm x25mm
Weight G.W 41g
Battery Exclude
3 on-board Grove connectors
DC Current per I/O Pin 40 mA
DC Jack Input 7v-12v
Flash Memory 32 KB
Clock Speed 16 MHz

Part List

Seeeduino V4.2 1


HSCODE 8543909000
USHSCODE 8471490000
UPC 841454103288



Just got your Arduino UNO but do not know what to do with it? No worries as today, we compiled 20 cool Arduino UNO projects to get you started!
We listed specifications including processor, operating voltage, input voltage, clock speed, digital I/O, PWM, analog inputs, UART, Grove connectors, flash memory and USB connectors for 7 Arduino official boards and 13 Seeeduino boards.
A Face Hitting Machine enables you hit those you dislike on the face, even with uplifting slap sound effect. Your decompression artifact.
This simple yet sophisticated project is ideal for weather stations as this Grove dust sensor provides accurate data, alongside an Arduino.
This sample project shows how to build Long Range Application connected soil moisture sensor
Merry Christmas! Do you want to have a Christmas tree that can interact with you?
Learn Image
This demonstrates how to use the Grove - 12 bit Magnetic Rotary Position Sensor(AS5600) to accurately measure angle changes.
This is an interactive art project made by a Seeeduino 4.2 boards, looking good and easy to do!
Just got your Arduino but don’t know what to do with it? No worries, we have compiled 20 cool Arduino projects to get you started!
This article will compare the various interfaces: UART, SPI and I2C and their differences.
Seeeduino v4.2 is an Open Source, Arduino-compatible ATmega328 MCU development board. We think Seeeduino v4.2 is one of the best Arduino derivatives/compatibles available. Seeeduino v4.2 is feature rich, much more stable, easy-to-use and even good looking



Write Your Own Review
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  1. Product Quality
    Received two of them today. They are very nice looking board. I've not had a chance to actually test them out yet but so far so good.
  2. Product Quality
    The board is not correctly detected (Windows 7 and Windows 10) : just seen as a AtMega DFU. The product is not usable.
  3. Product Quality
    It looked ok on arrival. There is a red marking on the ATmega16u2.
    But it does not work (both of them); neither the ATmega16u2 nor the Atmega328p have been programmed (no USB for download, no boot loader).
    After programming both chips program upload is still impossible.
    Please send checked replacements!
  4. Product Quality
    I really like this board. Especially the two I2C grove connectors. The only improvements would be to have a faster processor, more memory, and a more durable USB connector than the micro which doesn't handle the power requirements very well. I would like to see solder points for connecting a cable to the board directly when the USB connector fails, so the board is still usable.
  5. Product Quality
    I have had 2 of these boards running 24/7 on my desk since receiving them over a month ago, and have noticed no issues with heating or "oddness". My only problem with them is keeping my very curious kitten away from them for any length of time; still, they have even survived her playful attacks.

    All-in-all, these represent an excellent value for my prototyping needs at the '328p end of the spectrum.


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