Arduino Uno R4 vs On Semiconductor RSL10
Side-by-side comparison of features, pricing, ratings, and alternatives.
The Arduino Uno R4 is the latest revision of the world's most popular beginner microcontroller board, now powered by a 32-bit Renesas RA4M1 processor - a major jump from the original 8-bit design while keeping the same beginner-friendly form factor and pin layout. It remains the standard starting point for electronics education, supported by an enormous library ecosystem and the simple Arduino IDE, making it approachable for students and hobbyists building their first circuits. The WiFi variant adds built-in wireless connectivity for IoT projects, while a built-in 12x8 LED matrix on the WiFi model enables simple visual output without extra components.
The ON Semiconductor RSL10 is an advanced ultra-low power Bluetooth 5 certified multi-protocol System-on-Chip (SoC). Designed for resource-constrained IoT applications, it provides industry-leading energy efficiency during both active and sleep modes, making it ideal for energy-harvesting and long-life battery-powered devices. Equipped with an ARM Cortex-M33 processor and a dedicated dual-core architecture, the RSL10 delivers robust processing capabilities alongside flexible peripheral options. It supports a comprehensive software development kit (SDK) with tools for mobile application integration, firmware updates over-the-air (FOTA), and advanced sensor integration.
Around $20-27 depending on the variant.
- Extremely beginner-friendly
- Huge tutorial and library ecosystem
- Backward compatible with existing shields
- Affordable entry point
- Industry-leading low power consumption
- Support for energy harvesting applications
- Bluetooth 5 and multi-protocol capabilities
- Robust hardware security features
- Less powerful than Raspberry Pi for compute-heavy tasks
- No built-in display or OS
- WiFi variant costs more
- Steeper learning curve for custom firmware development
- Limited onboard flash compared to larger microcontrollers
- Requires specialized development boards for optimal evaluation
What reviewers say
Arduino Uno R4 Reviews
4.5 (2)Highly recommend Arduino Uno R4
I picked up Arduino Uno R4 a while back and haven't looked back. Huge tutorial and library ecosystem. One minor gripe: wifi variant costs more, but it hasn't been a dealbreaker. Would recommend.
Does exactly what we need
Been a regular user of Arduino Uno R4 for a while now. Affordable entry point. No major complaints so far. Would recommend.
On Semiconductor RSL10 Reviews
No reviews yet.
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The Verdict
AI-generated from listing dataThe Arduino Uno R4 is the safer, beginner-friendly default for general electronics projects, while the On Semiconductor RSL10 is built for advanced IoT engineers requiring ultra-low power Bluetooth. The main trade-off is accessibility and a massive ecosystem versus specialized low-power wireless and energy-harvesting capabilities.
Key differences
- •The Arduino Uno R4 targets students and beginners with an affordable price around $20-27 and the simple Arduino IDE, whereas the On Semiconductor RSL10 is built for IoT developers requiring custom firmware development.
- •The Arduino Uno R4 offers optional built-in WiFi and backward compatibility with classic Uno shields, while the RSL10 features industry-leading Bluetooth 5.0 and 2.4 GHz proprietary connectivity.
- •The RSL10 excels in power efficiency with ultra-low power consumption (62.5 nW in Deep Sleep) and energy-harvesting support, while the Arduino Uno R4 operates on standard physical device deployment without specified deep sleep metrics.
- •The Arduino Uno R4 is open source with community forums and documentation support, whereas the RSL10 is not open source and comes with a 1-year warranty.
Performance
Arduino Uno R4 features a 32-bit Renesas RA4M1 processor, while RSL10 uses an ARM Cortex-M33 processor with limited onboard flash.
Build quality
Dimensions and physical build quality details are not specified for the Arduino Uno R4; RSL10 is a 6 x 6 mm QFN package weighing 0.1g.
Connectivity
Arduino Uno R4 has optional built-in WiFi and shield integration; RSL10 features certified Bluetooth 5.0 and 2.4 GHz proprietary connectivity.
Power & efficiency
RSL10 offers industry-leading ultra-low power (62.5 nW in Deep Sleep), 7 mW peak receiving power, and energy-harvesting support; Arduino Uno R4 power metrics are not specified.
Compatibility
Arduino Uno R4 is backward compatible with classic Uno shields and supports Arduino IDE, Windows, Mac, and Linux platforms.
Price & value
Arduino Uno R4 costs around $20-27 depending on the variant, whereas the RSL10 pricing is unknown.
Warranty & support
Arduino Uno R4 provides support via forums and documentation and is open source; RSL10 has a 1-year warranty and is not open source.
Choose Arduino Uno R4 if…
Students and hobbyists wanting an affordable, beginner-friendly board with a massive community library ecosystem.
Choose On Semiconductor RSL10 if…
IoT developers and hardware engineers building batteryless or ultra-low power Bluetooth 5 devices.
Common questions
How much do these products cost?
The Arduino Uno R4 costs around $20-27 depending on the variant, while the pricing for the On Semiconductor RSL10 is unknown.
Which one is better for wireless connectivity?
The On Semiconductor RSL10 features a fully certified Bluetooth 5 radio and 2.4 GHz proprietary connectivity, whereas the Arduino Uno R4 offers optional built-in WiFi.
Are these products open source?
The Arduino Uno R4 is open source, while the On Semiconductor RSL10 is not open source.