Permanent storage memory is 4kB EEPROM with working storage and memory storage being added to the system. The reset button is stronger and brings the controller back to its starting position in Uno. It is difficult to erase the memory of the controller all at once. The reset button is not strong and does not reset everything in the system. If the applications are simple with sensors, GPS, motor controls, or alarm, it is better to go with an Uno microcontroller. If complex programs have to be written with ethernet shields and huge memory is needed, it is better to go with Mega. The bootloader footprint is 4kB or 8kB depending on the model used in the system.īootloader footprint is only 0.5kB and it does not work well with heavy load projects. Uno does not have a higher GPIO but it has a stronger CPU similar to other Arduino microcontrollers.ĭesktop prototyping cannot be done obviously due to its size and shields cannot be used for the same.ĭesktop prototyping can be easily done in the system with the use of shields as the size is small and memory is also less. If the project needs a higher GPIO, it is better to use Mega in the system. The architecture is light when compared with MVP. There is no user interface and hence less interfaces are used. Since the user interface is used more, there are a large number of interfaces that makes the architecture heavy. The smaller size of the controller helps it easily fit with any development board and designers can carry it easily around the boarding system. It cannot be used in space-restricted applications. The size is big and it does not fit easily with smaller development boards so designers cannot carry them easily all around. Uno is the popular Arduino due to its smaller size and compatibility with software and hardware in the system. Mega is used by engineers who are interested in hardcore electronics and it is not highly software compatible. The table below summarizes the comparisons between Arduino Mega vs Uno : But the code written for Mega will not work in Uno because all the pins are not available in Uno as Mega. All the codes written for Uno will work with Mega due to the less number of pins and the pins availability in Mega.Since Uno is smaller in size, it helps to make easy and compact projects in the system than Mega. While if the project has big codes and it needs lots of memory space to store the inputs and if the user is not a beginner, it is good to go with Mega on the board. This makes it easy to understand the working of the system. Beginners who need less pins to work with and a board with less cost can select Uno as it is easy to handle and has less pins. Mega has a crystal oscillator and Uno has a ceramic resonator. Mega works with any other compatible shields while Uno is not compatible with the shields. Uno does not have FTDI USB to Serial driver chip and hence it uses ATMega 16U2 that can work as a USB-to-Serial converter. The components of Mega and Uno differ from each other.When the program is up and running, the variables can be created and manipulated in Mega due to its SRAM space while it does not happen in Uno. Uno has 2kB SRAM space while Mega has 8kB SRAM space in the system. Static Random Access Memory is used in Arduino systems.If the code is large, it is better to go with Mega due to the memory. Mega has a flash memory of 256kB while that of Uno is 32kB. Both Mega and Uno have a clock speed of 16MHz but the memory and storage space is different.Both come with a through-hole to fit into the system. Among the digital pins, 15 have PWM in Mega and 6 in Uno. Uno has only 14 digital pins and 6 analog pins. There are 54 digital pins used and 16 analog pins used in the system. Mega has a large number of pins among both.Both can be connected to the computer using Standard A/B USB cable that is a part of the microcontroller system. The price of Uno comes $20-$23 while Mega is costly. The size of Mega is 4” x 2.1” and Uno is 2.7” x 2.1” that is smaller than Mega.Let us discuss some key differences between Arduino Mega vs Uno in the following points: Key differences between Arduino Mega vs Uno
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