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  * Arduino Nano DIP

 I urgently need individuals who are willing to cooperate on my
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Nano DIP: the smallest complete Arduino board 33 x 10mm

Published: 27 December 2019
Last updated: 21 June 2024
Content [Show/Hide]

 1. Selling at Elecrow
 2. Advantages of the Arduino Nano DIP
 3. Arduino Nano DIP features
 4. Additional features compared to the Arduino Uno
 5. Features same as the Arduino Uno
 6. Missing features compared to the Arduino Uno
 7. Nano DIP pinout
 8. Arduino Nano DIP circuit
 9. Why did you build the Nano DIP?
10. PCB design
11. More memory (32k/2048)
12. QFN24 package transformed into DIP26 package
13. Compatibility
14. 5V regulator
15. Upload sketches with the Arduino IDE
     1. Step 1
     2. Step 2
16. How to burn a bootloader into the ATtiny3217
17. ATtiny3227 vs ATtiny3217
18. Calibration of the internal RC oscillator
19. Checking the clock speed
20. My favorite Arduino chips

The Arduino Nano DIP is the smallest complete Arduino board ever.
It's compatible with the Arduino Uno, but surprisingly, it has the
same size as the ATmega328P-PU chip itself: 33 x 10mm.

Nano-DIP-the-smallest-Arduino-33-x-10mm
Nano-DIP-the-smallest-Arduino-33-x-10mmNano DIP: the smallest Arduino
Nano board 33 x 10mm

Selling at Elecrow

You can buy the Nano DIP at Elecrow.

[ATtiny3217-Arduino-development-board]
[ATtiny3217-Arduino-development-board]Smallest complete Arduino
board: the Nano DIP 33x10mm

Advantages of the Arduino Nano DIP

  * Unparalleled compactness, being the smallest Arduino board ever
    developed. Its DIP26 size of 33 x 10mm allows for easy
    integration into projects with limited space constraints.
  * It has more functionality than the Arduino Uno.
  * The DIP26 package leaves more pins free on a solderless
    breadboard.

Arduino Nano DIP features

  * DIP26 size, 33 x 10 mm
  * Arduino Uno compatible
  * ATtiny3217 instead of the ATmega328P
  * 21 I/O pins
  * 12 x 10 bit ADC channels
  * Supply voltage 1.8V - 5.5V
  * Supply voltage V+ max18V
  * Clock 16MHz (max 20Mhz)
  * Straightforward pinout

Additional features compared to the Arduino Uno

  * 1 x fast 350ksps 8-bit real DAC
  * The USB supply pin is protected by an ideal diode that doesn't
    have a 0.7V voltage drop
  * A 2-pole header, which is connected to D2, can be used as a
    jumper. Use pinMode(INPUT_PULLUP)
  * The LED at D0 can be disabled by a jumper

Features same as the Arduino Uno

  * USB connector for programming and debugging
  * Bootloader Optiboot preloaded
  * 32kByte program memory
  * 2048Byte SRAM
  * Reset button
  * 3 LEDs for indication of power, TXD and RXD
  * 5V regulator

Missing features compared to the Arduino Uno

  * The clock oscillator has no pins for an external crystal. The
    frequency accuracy is 2%
  * There is no 3.3V regulator on board

[Dily3217-size][Dily3217-size]The Arduino has shrunken down to
33x10mm

Nano DIP pinout

Note that the megaTinyCore is used. All the information needed to
program the Nano DIP can be found on SpenceKonde's GitHub.

[Arduino-Nano-DIP-pinout][Arduino-Nano-DIP-pinout]

Arduino Nano DIP circuit

[Small-ATti][Small-ATti]Small ATtiny3217 development board circuit
Arduino Nano DIP circuit

Why did you build the Nano DIP?

It was just fun to build a complete Arduino on the size of the
ATmega328P-PU chip itself. It was a challenge to get all parts on a
PCB the size of DIP26 IC. It was a really entertaining puzzle.
Moreover, I wanted a solid groundplane, thus as few tracks as
possible at the bottom side.
I know, there are better microcontrollers, like the STM32F103C8. But
that is not an Atmel chip, which can cause compatibility problems.

I also have many applications where the Arduino ATmega328PB-AU
microcontroller is simply too large in size.

PCB design

Fitting all 23 components within the 33mm x 7.6mm PCB was a
challenge. To make this job easy, I could have opted for small 0201
SMD parts and thin 2 mil traces. However, I chose not to do this. I
wanted the PCB to be cheap to produce, which imposed restrictive
conditions:

  * PCB trace width / space 6/6 mil.
  * Via drill / outer diameter 12/24 mil.
  * All SMD parts 0402 or larger.

[ATtiny3217-development-board-DIL24-2]
[ATtiny3217-development-board-DIL24-2]Smallest Arduino: Nano DIP
33x10mm

[Arduino-Nano-DIP-GND-plane][Arduino-Nano-DIP-GND-plane]Arduino Nano
DIP GND plane

Here is an video of the Nano DIP old version without the USB
connector.
It controls 21 LEDs in this demonstration video on YouTube:

More memory (32k/2048)

Until the year 2018, the small and cheap ATtiny microcontroller
series, such as the ATtiny85, had less memory (8k/512). This was
often a serious problem, sometimes you need a microcontroller with a
larger memory but small in size. But in 2018, more powerful ATtiny
chips were introduced, such as the ATtiny3217. It has 32kByte program
memory and 2048Byte SRAM equal to the ATmega328P which is used on the
Arduino Uno.

QFN24 package transformed into DIP26 package

For hobbyists, the drawback of the ATtiny3217 is that it is only
available in a QFN24 package, with a pin spacing of 0.5 mm, which can
only be soldered using a solder mask. Since there is no
breadboard-friendly DIL package of the ATtiny3217, you always need a
development board. That's why I made the small DIP board, just like I
did with the SAM15x15.

Compatibility

The pin numbers are different than the Arduino Nano or UNO, you must
change them in the sketch.

5V regulator

The maximum input voltage on the V+ pin is 18V.

Upload sketches with the Arduino IDE

Step 1

  * File > Preferences > Additional board manager URLs = http://
    drazzy.com/package_drazzy.com_index.json
  * Tools > Boards -> Boards Manager
  * Select "megaTinyCore by Spence Konde" and click "Install"

Step 2

  * Tools > Board = ATtiny3217 (Optiboot).
  * Board = First set Tools > Clock Speed = 16MHz.
  * Upload the sketch

Note that the bootloader is already burned by me.

How to burn a bootloader into the ATtiny3217

Note that you don't need this step because the bootloader is already
burned by me. Read here how you can burn a bootloader yourself:
Burning a bootloader into the ATtiny3217.

ATtiny3227 vs ATtiny3217

My preference is the ATtiny3217 because it has an extra DAC. These
are the main differences:

  * ATtiny3217: 1-series, DAC
  * ATtiny3227: 2-series, no DAC,12 bit ADC, 3kbyte RAM, differential
    ADC, 2 UARTs

See more:

  * ATtiny microcontroller comparison chart

Calibration of the internal RC oscillator

The accuracy of the internal RC oscillator is factory calibrated
within +-4%. This only applies for 0-70oC 16MHz or 20MHz and voltage
between 1.8 and 3.6V. It is possible to perform a secondary
calibration of the RC oscillator to obtain a frequency accuracy
within +-1% see here. Note that the oscillator temperature coefficient
is also corrected and calibrated. 

Checking the clock speed

If you forget to set the clock speed with tools> Clock Speed, it can
have serious consequences. For example, at the Yamaha battery dongle,
to reduce power consumption, I use a clock frequency of 5MHz instead
of 20MHz.  If the factory forgets to set the frequency, the dongle
will still work. While the dongle still passes the test, the
electronics will overheat. That is why it is important to add a test
in the software. In this example, the program stops if the clock
frequency is not 5Mhz.

while(checkClockSpeed()) blinkError(5)

bool checkClockSpeed()
{ byte b = CLKCTRL.MCLKCTRLB; // 0=20MHz 1=10MHz 11=5MHz not allowed: 16, 8, 4, 1 MHz
  return b!= 3;
}

My favorite Arduino chips

  * ATmega328PB is the successor of the ATmega328P.
  * ATtiny3217 is is ideal for miniature PCBs.

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