Arduino Uno Rev3 vs Teensy 4.1
Side-by-side comparison of features, pricing, ratings, and alternatives.
The Arduino Uno Rev3 is a compact development board based on the ATmega328P microcontroller. It offers 14 digital I/O pins, 6 analog inputs, and a USB interface for easy programming. Its robust design, extensive community support, and open-source hardware make it ideal for learning electronics, building prototypes, and creating interactive projects.
The Teensy 4.1 is a powerful microcontroller board featuring an NXP i.MX RT1062 processor running at 600 MHz, providing exceptional computing power in a compact form factor. It includes expanded memory options with an onboard MicroSD card socket and room for optional Flash and PSRAM chips. Building on the success of its predecessor, the 4.1 retains the familiar breadboard-friendly layout while adding significantly more I/O pins, an Ethernet PHY, and a USB host port, making it ideal for advanced audio processing, robotics, and custom hardware controllers.
- Low cost entry point
- Large community and library support
- Simple USB programming
- Robust and well‑documented
- Incredible processing speed and performance for a microcontroller
- Ample memory and expansion options via MicroSD and memory pads
- Extensive peripheral support including Ethernet and USB host
- Familiar and robust Arduino/Teensyduino software ecosystem
- Limited processing power compared to newer boards
- No native Wi‑Fi or Bluetooth
- 5 V logic may require level shifting for 3.3 V devices
- Operates at 3.3V logic and is not 5V tolerant
- Larger physical size compared to the Teensy 4.0
- Steeper learning curve for advanced networking and peripheral configuration
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The Verdict
AI-generated from listing dataTeensy 4.1 delivers far higher performance and connectivity for demanding projects, while Arduino Uno Rev3 offers a low‑cost, beginner‑friendly, fully open‑source platform.
Key differences
- •CPU speed: 600 MHz Cortex‑M7 vs 16 MHz ATmega328P.
- •Memory: 8 MB Flash vs 32 KB Flash.
- •Connectivity: built‑in Ethernet & USB host on Teensy vs none on Uno.
- •Form factor & weight: Teensy is smaller and lighter (61 × 18 mm, 5 g) than Uno (68.6 × 53.4 mm, 25 g).
- •Open‑source: Uno hardware is open‑source; Teensy is not.
Performance
Teensy 4.1 runs a 600 MHz Cortex‑M7, far faster than Uno's 16 MHz ATmega328P.
Build quality
Both are solid development boards; no specific quality differences given.
Connectivity
Teensy includes USB host, 10/100 Mbps Ethernet PHY, CAN Bus; Uno has only USB‑serial.
Power & efficiency
Uno operates at 5 V with regulator; Teensy uses 3.3 V only and is not 5 V tolerant.
Compatibility
Uno is fully open‑source and widely supported; Teensy is not open‑source.
Price & value
Uno costs $22 vs Teensy $29.95, offering lower entry cost.
Warranty & support
Both provide a 1‑year warranty; support details not specified.
Choose Arduino Uno Rev3 if…
Beginners, educators, or hobbyists prioritizing low cost, simplicity, and open‑source hardware.
Choose Teensy 4.1 if…
Advanced engineers needing high speed, large memory, Ethernet or USB‑host capabilities.
Common questions
Is the Teensy 4.1 compatible with Arduino libraries?
Yes, it works with the Arduino IDE via the Teensyduino add‑on.
Can I power the Arduino Uno from USB only?
Yes, the Uno is USB powered and includes a 5 V regulator.
Which board offers built‑in Ethernet?
Only the Teensy 4.1 includes a native 10/100 Mbps Ethernet PHY.