What can the Arduino board use to simulate outputting analog voltage levels
If you looking for a powerful microcontroller equally an alternative to either ATmega328 or ATmega32u4 that most Arduino boards possess right now, the SAMD21 Arduino boards will definitely be a good selection to consider. This guide will encompass:
- What is SAMD21?
- Why employ SAMD21?
- Which SAMD21 Arduino Board to use?
With 32-bit microcontroller providing improve operation and larger storage space to meet the challenges of increasingly complex embedded system design, it is helpful to have a basic idea about the most popular 32-chip MCUs.
Before we motility on to await at which SAMD21 Arduino boards should you use, permit u.s. detect out more about the SAMD21 and why should you use it:
What is the SAMD21
The Atmel's ATSAMD21 is a low-power, high-performance Microchip's ARM® Cortex®-M0+ based flash microcontroller. Hither are its features:
- 256KB of flash and 32KB of SRAM
- 48MHz Operating Frequency
- Full Speed USB device and embedded host
- Support for upwards to 120 bear upon channels
- 1.62V to 3.63V ability supply
- Six serial communication modules (SERCOM) configurable as UART/USART, SPI or ItwoC, three 16-bit timer/counters, 32-scrap Real-Time Clock and calendar, 20 PWM channels, one 14-channel 12-bit ADC, one ten-bit DAC
As yous can run into this is a very powerful microcontroller compared to the older viii-bit/16MHz Arduino microcontrollers.
Not convinced? Here are more reasons you should use the SAMD21:
Why use the SAMD21?
Large Retentiveness and Fast Operating Speed
Restricted by storage limits on your Arduino UNO? Or feel that other microcontrollers operating speed are but too slow? Well the SAMD21 will solve all of your issues.
The SAMD21 256KB of wink means y'all would not be limited to only 32KB of space where yous take to fit all of your compiled sketch into. In addition, actress flash storage means you lot tin can store large, user-divers blocks of information as well into your microcontroller. Not to mention it features 32KB SRAM where y'all do non have to worry about dynamic memory stack overflows anymore.
Furthermore, with SAMD21 max CPU speed of 48MHz, operating speeds volition not exist a worry anymore.
Sensitive Voltage Measurements
The SAMD21 features 14 ADC input pins with a 12-bit resolution compared to ten-bit on the ATmega328p. The increased resolution means that every scrap between 0 and 4095 represents 0.806mV when the processor is powered at 3.3V which equals a more sensitive voltage measurement.
Integrated USB Controller
The ATSMAD21 is equipped with an integrated USB controller which can exist used as either a USB device or host.
Equally a USB device, it is able to emulate a keyboard, mouse or joystick,etc. It is able configure itself every bit a USB communication device class where you tin connect it with a computer where you can talk to information technology as a serial port.
On the other hand, as a USB host, the ATSAMD21 tin connect a mouse or keyboard or also relieve data to a USB wink drive.
RTC (Existent time clock) onboard
Need precise time-keeping for your digital clock or PID loop? Even though the ATmega328 has an RTC on lath, information technology is required for timekeeping. The SAMD21 also has an RTC that is powered separately by an on-board crystal while it still clocks the processor at 48MHz.
Configurable Serial Interfaces
This is one of the most unique features that make the SAMD so special. It is every bit has a set of half-dozen configurable serial interfaces that can be turned into either a UART, I2C master, I2C slave, SPI chief or SPI slave.
Due to this characteristic, it provides you with a lot of flexibility as the ports tin can be multiplexed which gives you a choice of which task each pin is assigned.
Which SAMD21 Arduino Lath to use?
And then now you know what the SAMD21 is and its capabilities, which SAMD21 Arduino boards should y'all use?
Well, nosotros have compiled a few of the best SAMD21 Arduino boards currently and take categorized them based on their individual strengths. Here is our showtime board:
Smallest: Seeeduino XIAO —— Arduino Microcontroller – SAMD21 Cortex M0+ with Free Course
Have space constraints in your Arduino projects? This small-sized SAMD21 Seeeduino XIAO would fit almost everywhere and anywhere! Perfect for wearable devices and small projects!
Continuing at only 23.5 ten 17.5, this board is equally pocket-sized as your thumb. The Seeeduino XIAO is the smallest Arduino compatible lath in Seeeduino Family. Information technology is an Arduino microcontroller that is embedded with the SAMD21 microchip with rich interfaces as well assuasive it to be capable of being a tiny Dev. Lath as well.
Apart from the stiff CPU, Seeeduino XIAO is excellent in many other functions. Despite beingness this small size, it has 14 GPIO PINs, which can be used for 11 analog PINs, 11 digital PINs, i I2C interface, 1 UART interface, and 1 SPI interface. Some PINs have various functions, A1/D1 to A10/D10 Pins take PWM functions and Pin A0/D0 has a function of DAC which means y'all can go true analog signals not PWM signals when you define it equally an analog pin, that'south why fourteen GPIO PINs can realize more I/O PINs and interfaces.
The Seeeduino XIAO supports the USB Type-C interface which can supply ability and download code. In addition, at that place are ability pads at the dorsum of the XIAO which support battery and makes designing article of clothing devices easy and simple. Other than the power LED, nosotros also added a user LED on board for better coding experience.
Commonly a Dev. Board as small every bit this size will use the chip's inner crystal oscillator for time fixing, in order to make the clock more accurate, Seeeduino XIAO layouts an extra 32.768KHz to make the clock more stable.
And of course, the Seeeduino XIAO is perfectly uniform with Arduino IDE which allows yous to easily develop small projects with the help of the big and comprehensive Arduino library.
The best news is, yous can get all features packed on a tiny board this just for only $4.90! Wow!
Tech Specs
| Specs | Seeeduino XIAO |
| Microcontroller | ATSAMD21G18, 32-Bit ARM Cortex M0+ |
| Operating Voltage | 3.3V |
| Digital I/O Pins | 11 |
| PWM Pins | 10 |
| Analog I/O Pins | 11 |
| Flash Retentiveness | 256KB |
| SRAM | 32KB |
| Size | 23.5mm x 17.5mm |
| Price | $iv.90 |
Best for Beginners – Arduino Zero
Firstly, if you lot are looking a SAMD21 Arduino board to get started with, the Arduino Nothing would be the best choice.
Established by the Uno, the Arduino Zero is a simple and powerful 32-bit extension of the platform. With it, you can create various projects like smart IoT devices, wearables, home automation, robotics, and many more. Powered by Atmel's SAMD21 MCU, which features a 32-bit ARM Cortex® M0+ cadre this board is great if you are looking for a board to acquire about 32-flake awarding evolution.
With the Atmel Embedded Debugger (EDBG), the Arduino Zero provides you a total debug interface without any need for boosted hardware making things easier.
However, unlike nearly Arduino boards, the Naught operating voltage is 3.3V where voltage higher than that, could damage the board. The board as well has a slightly high price tag at $42.xc.
Tech Specs
| Specs | Arduino Cypher |
| Microcontroller | ATSAMD21G18, 32-Flake ARM Cortex M0+ |
| Operating Voltage | 3.3V |
| Digital I/O Pins | 20 |
| PWM Pins | eighteen |
| Analog I/O Pins | seven |
| Wink Memory | 256KB |
| SRAM | 32KB |
| Size | 68mm x 53mm |
| Price | $42.ninety |
Cost-Effective Board: Seeeduino Cortex-M0+
Want a cheaper SAMD21 Arduino board? Want an Arduino Zero lath that runs at 5V to connect your 5V shields? If your answer is yes for both of the questions, this Seeeduino lath is for you!
At only $9.90, you tin can go yourself a SAMD21 board! The Seeeduino M0+ is a make new product line that is fully uniform with Arduino Zero and this is the Seeeduino Cortex-M0+.
The Seeeduino Cortex-M0+ has the same header pinout equally the Seeeduino Lotus Cortex-M0+, including 14 digital I/O (10 PWM output) and 6 analog I/O. In the concurrently, it provides iii on-board Grove connectors: ii I2C and 1 UART. If you desire more grove ports, you can use a Base of operations Shield V2 to work with this board.
What is Grove?
Y'all may have realized that I mentioned that this lath has 3 onboard Grove connectors, just what is that?
Well, Grove is Seeed's very own modular, standardized connector prototyping system. Grove takes a building block approach to assemble electronics. Compared to the jumper or solder-based system, it is easier to connect, experiment, and build and simplifies the learning arrangement. With the Grove system, building your SAMD21 project is now easier!
Back to the board…
The Seeeduino Cortex-M0+ is also the first Seeeduino evolution board with a USB type C interface. USB Blazon C is the time to come trend: the plugs are reversible, higher data transfer rate, and more than scalable functions. With this interface, you can use blazon C to supply ability and transmit data or use the 7~15V DC jack to supply power for this board.
If y'all are looking for a cost-effective and beginner-friendly SAMD21 board, the Seeeduino Cortex-M0+ is definitely a good choice.
Tech Specs
| Specs | Seeeduino Cortex-M0+ |
| Microcontroller | ATSAMD21G18, 32-Fleck ARM Cortex M0+ |
| Operating Voltage | 5V |
| Digital I/O Pins | 14 |
| PWM Pins | 10 |
| Analog I/O Pins | vi |
| Wink Memory | 256KB |
| SRAM | 32KB |
| Size | 68mm ten 53mm |
| Price | $9.xc |
Plug and Play: Seeeduino Lotus Cortex-M0+
Looking for a board where y'all can conveniently plug and go started with no jumper wires or soldering? If so, this Seeeduino Lotus Cortex-M0+ will be perfect for you lot!
Seeeduino Lotus Cortex-M0+ is a SAMD21 Microcontroller development board which features 14 digital input/outputs (10 of which support PWM) and 6 analog input/outputs, 3 Serial Communication Interface, a micro USB connector, a JST2.0 Li-Po connector, an ICSP header, 12 Grove connectors, a reset push button. 12 Grove connectors! With it, you can easily plug and play with various modules in a matter of seconds!
The Seeeduino Lotus Cortex-M0+ is an upgraded version of Seeeduino Lotus V1.i, where it is replaced with a more powerful chip, optimized circuit layout with the power supply being more than stable. Considering this flake supports direct USB level output, there is no demand to use a series port to USB chip, like CP2102N. Therefore, you save on costs, additional hardware and also free up one more hardware serial port for yourself!
Similarly to the Arduino Null, this board operating voltage is at 3.3V where if any input is more than 3.3V, it may damage the lath.
Tech Specs
| Specs | Seeeduino Lotus Cortex-M0+ |
| Microcontroller | ATSAMD21G18, 32-Bit ARM Cortex M0+ |
| Operating Voltage | 5V |
| Digital I/O Pins | 14 |
| PWM Pins | 10 |
| Analog I/O Pins | half dozen |
| Flash Retentiveness | 256KB |
| SRAM | 32KB |
| Size | 68mm x 53mm |
| Toll | $9.90 |
What is RP2040?
The RP2040 is a 32-bit dual ARM Cortex-M0+ microcontroller integrated excursion by Raspberry Pi Foundation. The RP2040 features a dual-cadre Arm Cortex-M0+ processor clocked at 133MHz with 264KB internal SRAM and 2MB internal flash storage and tin be programmed in both C/C++ and the beginner-friendly MicroPython. It is no wonder that Raspberry Pi official concisely quotes RP2040 as loftier performance and depression dynamic power consumption.
- Low power consumption
- Larger RAM and Flash memory
- High-Frequency clock of 133 MHz
- High level programming languages supported
Overview of RP2040-based Boards
Seeed has published a serial of new, toll-constructive, and versatile microcontrollers congenital with RP2040 that supports MicroPython and C/C++. Please cheque our special campaign beneath.
XIAO RP2040 —— a Tiny Pollex Size RP2040-based board.
XIAO RP2040 is a microcontroller using the Raspberry RP2040 bit. It runs at up to 133MHz, is built with rich interfaces in a tiny thumb size, and fully supports Ardunio, MicroPython, and CircuitPython. The onboard interfaces are enough for developing multiple applications.
Production Features
- Powerful MCU: Dual-core ARM Cortex M0+ processor, flexible clock running upward to 133 MHz
- Rich on-chip resource: 264KB of SRAM, and 2MB of onboard Flash memory
- Flexible compatibility: Support Micropython/Arduino/CircuitPython
- Like shooting fish in a barrel project performance: Breadboard-friendly & SMD design, no components on the back
- Small size: As small as a thumb(twenty×17.5mm) for wearable devices and small projects
- Multiple interfaces: 11 digital pins, 4 analog pins, 11 PWM Pins,1 I2C interface, ane UART interface, one SPI interface, 1 SWD Bonding pad interface
- Broad compatibility: Pins compatible with Seeeduino XIAO and supports Seeeduino XIAO'south Expansion lath
Comparison between SAMD21 VS RP2040
| SAMD21 | RP2040 | |
| Processor | ARM® Cortex®-M0+ CPU running at up to 48 MHz | Dual ARM Cortex-M0+ @ 133MHz |
| Memories | • 32/64/128/256 KB in-arrangement self-programmable Flash • 4/8/sixteen/32 KB SRAM Retentivity | • 264kB on-chip SRAM in half-dozen independent banks • Support for up to 16MB of off-chip Flash retentivity via dedicated QSPI bus |
| ADC | 12-bit resolution and capable of converting upwardly to 350ksps | 3 available × 12-scrap |
| I/O | Upward to 52 programmable I/O pins | 30 GPIO pins, four of which tin can be used as analogue inputs |
| Operating Ability | 1.62V – 3.63V | iii.3V |
| Low Ability | • Idle and Stand-by Slumber modes • SleepWalking peripherals | Low power slumber-way entry using Wait For Interrupt (WFI), Await For Event (WFE) instructions, or the return from interrupt slumber-on-get out feature |
And equally we know, XIAO RP2040 is powered by RP2040 while Seeeduino XIAO past SAMD21. Here is a table to show more difference between SAMD21 and RP2040.
| Detail | XIAO RP2040 | Seeeduino XIAO |
| Processor | Dual-core ARM® Cortex® M0+ @133MHz | ARM® Cortex®-M0+ @48MHz |
| Wink | 2MB | 256KB |
| Onboard Button | Reset Button/ Boot Button | No Push button(reset pad) |
| RGB LED | Full Color RGB LED | None |
| Analog Pin | 4 | xi |
| PWM Pin | 11 | 10 |
| DAC Output | None | one |
| Programming language | ArduinoMicroPythonCircuitPython | Arduino |
Summary
No matter if you are looking for an easy to use board, small board, cost-effective lath, nosotros have them all hither at Seeed! What do think of these boards and recommendations?
Let us know in the comments down beneath!
At present that you lot've got your SAMD21 Arduino lath, check out our guide on how to go started with it!
Source: https://www.seeedstudio.com/blog/2020/01/09/samd21-arduino-boards-which-one-should-you-use/
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