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https://github.com/obono/attiny85rpncalc

A RPN Calculator with ATtiny85
https://github.com/obono/attiny85rpncalc

arduino attiny85 rpn-calculator ssd1306

Last synced: 13 days ago
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A RPN Calculator with ATtiny85

Host: GitHub
URL: https://github.com/obono/attiny85rpncalc
Owner: obono
License: mit
Created: 2021-07-28T12:07:03.000Z (over 3 years ago)
Default Branch: main
Last Pushed: 2024-01-31T14:33:28.000Z (11 months ago)
Last Synced: 2024-01-31T16:23:19.016Z (11 months ago)
Topics: arduino, attiny85, rpn-calculator, ssd1306
Language: C++
Homepage:
Size: 303 KB
Stars: 4
Watchers: 4
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

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README

        # ATtiny85RpnCalc

![Picture](doc/picture.jpg)![Key assign](doc/picture_key_assign.jpg)

A RPN Calculator with ATtiny85.

* 8 significant digits.

* 16 Levels stack with overflow prevention.

## Instruction

![Instruction](doc/instruction.png)

* 0~9, ., &plus;/−

  * Edit the current number.

  * If it is determined, it's pushed into the stack and a new number is edited.

* Enter

  * Determine the current number.

  * If it is already determined, it's duplicated and pushed into the stack.

* &plus;, −, ×, &div;

  * Pop a number from the stack and operate with the current number.

* Clear

  * Clear the current number and pop a number from the stack.

  * All clear if this button is held long.

## Hardware

### Components

* ATtiny85

* 0.91 inch 128×32 pixels OLED screen SSD1306 I2C

* 18 tactile switches

* Resistors

  * 150Ω, 180Ω, 220Ω, 330Ω, 390Ω, 510Ω, 680Ω

  * 1.0kΩ, 1.5kΩ×2, 2.2kΩ, 3.0kΩ, 4.7kΩ×2, 8.2kΩ

  * 15kΩ, 22kΩ, 82kΩ

* An electrolytic capacitor: 47µF

* A battery holder for CR2032

* A slide switch

* Wires, connectors, etc...

### Schematic

[![Click to expand](doc/schematic_thumbnail.png)](doc/schematic.png)

## Software

### Build environment

[Install ATTinyCore boards to the Arduino IDE](https://github.com/SpenceKonde/ATTinyCore/blob/master/Installation.md) and configure the settings as follows.

Attribute        |Value

-----------------|------------------------------

Board            |ATtiny25/45/85 (No bootloader)

Chip             |ATtiny85

Clock            |4 MHz (Internal)

B.O.D. Level     |B.O.D. Disabled (saves power)

Save EEPROM      |EEPROM not retained

Timer 1 Clock    |CPU (CPU frequency)

LTO              |Enabled

millis()/micros()|Disabled

### Acknowledgement

* [SimpleWire.h](https://lab.sasapea.mydns.jp/2020/03/11/avr-i2c-2/)

  * Copyright (c) 2020 Sasapea's Lab. All right reserved.

### License

These codes are licensed under [MIT License](LICENSE).

## References

* [nekopla/simple_rpn_calc](https://github.com/nekopla/simple_rpn_calc)

* [pado3/tinyRPN](https://github.com/pado3/tinyRPN)