Last Updated on 27 January 2024 by Suffocation
Since 2023, the Uno is on the market in revision 4. Here, the models branch into the Minima (similar to the original Uno) and the Wifi. In some older revisions, the microcontroller is socketed, so it can be easily replaced if something goes wrong. It is the perfect beginner board to get into microcontroller programming. It is therefore very well suited for training purposes, but unfortunately a bit expensive in its original form. However, it should be considered that this helps to finance the development of the development environment.
From my perspective, apart from the R4 Wifi, it's no longer entirely up-to-date, as it quickly reaches its limits due to its lack of Wi-Fi connectivity and small memory. The Internet of Things craves affordable, wireless communication options. Other controllers such as the ESP or the Raspberry Pi Pico W are better suited for this.
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History
| Appearance | Name | Op.U | Processor | End | Some special features |
|---|---|---|---|---|---|
| 2006 | Arduino Serial | 5V | ATMEGA8 | Serial | Special features |
| 2007 | One | 5V | ATMEGA8 + ATMEGA8U2-MU | USB-B | Chip on the board, |
| 2008 | R2 | 5V | ATmega328P ATMEGA8U2-MU | USB-B | Chip rotated by 45°, straight on the PCB, |
| 2010 | R3 | 5V | ATmega328P | USB-B | The chip on the board, 4 additional pins. 2 for I2C interface. 1 for the reference voltage for add-on boards, 4. unused |
| 2023 | R4-Minima | 5V | Renesas RA4M1 (Arm® Cortex®-M4) | USB-C | |
| 2023 | R4-WiFi | 5V | Renesas RA4M1 (Arm® Cortex®-M4) | USB-C | Wi-Fi / LED Matrix |
Overview
| Name | Arduino Uno |
|---|---|
| Number/CPU | ATmega328P |
| Clock speed (MHz) | 16 |
| Kernel | 1 |
| Digital IOs / Pins | 14 |
| Analog inputs | 6 |
| Interrupt Pins | 2 |
| Pulse Width Modulation | 6 |
| SPI | 1 |
| Flash memory | 32 KB |
| RAM (KB) | 2 |
| EEPROM (KB) | 1 |
| WiFi | – |
| Encryption | – |
| Bluetooth | – |
| UART | 1 |
| I2C | 1 |
| Ethernet | – |
| Video | – |
| Sound | – |
| Miscellaneous | – |
| USB | 1 normal |
| Operating voltage [V] | 5 |
| Input voltage | 7-12 |
| Current (mA) / Standby (mA) | |
| Size L x W x H | 68,6 x 53,3 |
| Weight [g] | 25 |
Pin assignment
Miscellaneous
Circuit diagrams
Arduino Uno
Arduino Uno R2
Arduino Uno R3
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Add-on boards
- Retro Project – FDC USB Floppy Disk Controller
- Preview – Arduino Motor Shield with L298P
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- Datenlogger Shield V 1.0
- NEO-6M GPS Logger Shield V1.0
- Arduino Sensor Board V5.0 (Sensor Shield)
- FunduMoto L298P High Power Motor Driver Board
- Arduino Screw Terminal Board (Screw Shield 1.0)
- Arduino Multi-function Sensor Board
Sources
https://www.arduino.cc/en/Guide/ArduinoUno
https://store.arduino.cc/arduino-uno-rev3
https://www.zippia.com/arduino-careers-1555069/history/#
https://startingelectronics.org/articles/arduino/uno-r3-r2-differences/
Hello Stefan,
I found your blog through the ESP32 LoRa – I like it.
The Ct magazine also reports on LoRaWAN in its current issue, which I unfortunately didn't quite understand.
So, I've had an Arduino Uno and a Raspberry Pi lying around in a cupboard for quite some time, and I'd love to experiment with them, but I'm also lacking a proper, senior-friendly guide, and the time (like you!) is also an issue.
P.S. I'm also a fan of the CC2, though W. Rudolf should live somewhere around my corner (56457 Westerburg)?
Kind regards
Wolfgang
Hello Wolfgang,
Glad you liked the article. Yes, CC2 is great.
I'll buy that CT article right away. I had a quick read about Lora,
all that remains is that it's about long-distance communication, but the name itself suggests that anyway 😉
Hello
Stefan