---
product_id: 264630440
title: "(PID 3505 Metro M0 Express - Designed for CircuitPython - ATSAMD21G18"
brand: "adafruit"
price: "$1666"
currency: MXN
in_stock: true
reviews_count: 5
url: https://www.desertcart.mx/products/264630440-pid-3505-metro-m0-express-designed-for-circuitpython-atsamd21g18
store_origin: MX
region: Mexico
---

# 48 MHz speed 256K FLASH USB-to-Serial (PID 3505 Metro M0 Express - Designed for CircuitPython - ATSAMD21G18

**Brand:** adafruit
**Price:** $1666
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate Your Projects with Metro M0 Express!

## Quick Answers

- **What is this?** (PID 3505 Metro M0 Express - Designed for CircuitPython - ATSAMD21G18 by adafruit
- **How much does it cost?** $1666 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/264630440-pid-3505-metro-m0-express-designed-for-circuitpython-atsamd21g18)

## Best For

- adafruit enthusiasts

## Why This Product

- Trusted adafruit brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Connectivity:** 25 GPIO pins, including true analog out and multiple hardware ports.
- • **Unleash Your Creativity:** With 256K FLASH and 32K RAM, the possibilities are endless!
- • **Plug-and-Play Programming:** Easily drag and drop firmware with the pre-loaded UF2 bootloader.
- • **Seamless Power Management:** Switch effortlessly between USB and DC power sources.
- • **Future-Proof Your Projects:** Compatible with CircuitPython, PXT MakeCode, and Arduino IDE.

## Overview

The Adafruit Metro M0 Express is a powerful microcontroller featuring the ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz. It boasts 256K of FLASH memory and 32K of RAM, making it ideal for advanced projects. With built-in USB capabilities, easy power management, and extensive GPIO options, this board is perfect for makers looking to innovate with ease.

## Description

Adafruit(PID 3505 Metro M0 Express - Designed for CircuitPython - ATSAMD21G18

## Features

- ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz and at 3.3V logic, the same one used in the new Arduino Zero. This chip has a whopping 256K of FLASH (8x more than the Atmega328) and 32K of RAM (16x as much)!
- This chip comes with built in USB so it has USB-to-Serial program & debug capability built in with no need for an FTDI-like chip.
- Power the METRO with 7-9V polarity protected DC or the micro USB connector to any 5V USB source. The 2.1mm DC jack has an on/off switch next to it so you can turn off your setup easily. The METRO will automagically switch between USB and DC.
- METRO has 25 GPIO pins, 12 of which are analog in, and one of which is a true analog out. There's a hardware SPI port, hardware I2C port and hardware UART. Logic level is 3.3V
- Easy reprogramming, comes pre-loaded with the UF2 bootloader, which looks like a USB storage key. Simply drag firmware on to program, no special tools or drivers needed! It can be used to load up CircuitPython, PXT MakeCode or Arduino IDE (it is bossa-compatible)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| RAM | SRAM |
| Memory Speed | 48 MHz |
| Wireless Type | 802.11b |
| Brand | Adafruit |
| Series | FBA_3505 |
| Item model number | FBA_3505 |
| Operating System | CircuitPython |
| Item Weight | 0.915 ounces |
| Product Dimensions | 3 x 2 x 1 inches |
| Item Dimensions  LxWxH | 3 x 2 x 1 inches |
| Processor Brand | Adafruit |
| Number of Processors | 1 |
| Manufacturer | Adafruit |
| ASIN | B071P145RG |
| Is Discontinued By Manufacturer | No |
| Date First Available | August 10, 2016 |

## Product Details

- **Brand:** Adafruit
- **Model Name:** FBA_3505
- **Ram Memory Installed Size:** 2 MB
- **Memory Storage Capacity:** 2 MB
- **Connectivity Technology:** USB

## Images

![(PID 3505 Metro M0 Express - Designed for CircuitPython - ATSAMD21G18 - Image 1](https://m.media-amazon.com/images/I/811K-LHnsoL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
    Carte adafruit m0
  
  

*by C***Z on Reviewed in France 🇫🇷 on 18 February 2020*

Produit commandé pour mon travail , le premier exemplaire était hors service dés la réception  , pas reconnu par l’ordinateur ( alors que j’utilise un  câble avec données ) bouton reset inopérant ( simple ou double clic) et pas de lancement du programme interne , je l’ai donc renvoyé  . Le second exemplaire fonctionne lui parfaitement , il a été reconnu tout de suite et le fichier  systeme crurent.uf2 était à jour . Délais de livraison très correct deux ou trois jours , retour du produit défectueux sans problème .

### ⭐⭐⭐⭐⭐ 







  
  
    this is great. I have only been programming in CircuitPython at ...
  

*by T***R on Reviewed in the United States 🇺🇸 on 3 March 2018*

I purchased this after I got the Circuit Playground Express.  I have been programming Arduinos for years and if you are doing some basic tests, this is great.  I have only been programming in CircuitPython at this point but the great thing is the number of test cycles you can get is much greater than what you get with Arduino due to the lack of a compile cycle.  If speed is a concern, do not use CircuitPython as I do notice a significant speed limit.  I am using a 60 NeoPixel ring and with some of the effects I have programmed, there is no need to pause / sleep / delay due to the interpreter. I am still working with this board and I haven't tried out all of the features.  The next task is testing the analog out to see what it can do.  It would be interesting if this can produce true wave forms.

### ⭐⭐⭐⭐⭐ 







  
  
    Great for kids and robots
  

*by S***N on Reviewed in the United States 🇺🇸 on 24 July 2021*

Used these with Elegoo robot car kits so kids could program with CircuitPython instead of C++

## Frequently Bought Together

- Adafruit (PID 3505 Metro M0 Express - Designed for CircuitPython - ATSAMD21G18
- ELEGOO Upgraded Electronics Fun Kit w/Power Supply Module, Jumper Wire, Precision Potentiometer, 830 tie-Points Breadboard Compatible with Arduino, STM32
- ELEGOO 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Ribbon Cables Kit Compatible with Arduino Projects

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**Shop now:** [https://www.desertcart.mx/products/264630440-pid-3505-metro-m0-express-designed-for-circuitpython-atsamd21g18](https://www.desertcart.mx/products/264630440-pid-3505-metro-m0-express-designed-for-circuitpython-atsamd21g18)

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-01-22*