# ATtiny84A Development Board v2 Development board for ATtiny 24(A)/44(A)/84(A) with ICSP programming header and Arduino IDE support.  # Pinout  # Features of the ATtiny x4(A) | Specification | ATtiny24 | ATtiny44 | ATtiny84 | | ------------- | -------- | -------- | -------- | | Flash | 2048 bytes | 4096 bytes | 8192 bytes | | SRAM | 128 bytes | 256 bytes | 512 bytes | | EEPROM | 128 bytes | 256 bytes | 512 bytes | | GPIO Pins | 11 + RESET | 11 + RESET | 11 + RESET | | ADC Channels | 12 (incl RST) | 12 (incl RST) | 12 (incl RST) | | Differential ADC | 1/20x gain | 1/20x gain | 1/20x gain | | PWM Channels | 4: PA5-7, PB2 | 4: PA5-7, PB2 | 4: PA5-7, PB2 | | Interfaces | USI | USI | USI | | Internal Oscillator | 8, 4, 2, 1 MHz | 8, 4, 2, 1 MHz | 8, 4, 2, 1 MHz | | External Crystal | max 20 MHz | max 20 MHz | max 20 MHz | | External Clock | max 20 MHz | max 20 MHz | max 20 MHz | | Int. WDT Oscillator | 128 kHz | 128 kHz | 128 kHz | | Default Pin Mapping | Clockwise | Clockwise | Clockwise | | LED_BUILTIN | PIN_PB2 | PIN_PB2 | PIN_PB2 | Note: The 24/44/84 and 24A/44A/84A are functionally identical, have the same signatures and are fully interchangible; the latter replaced the former in 2008, uses slightly less power, and has a more accurate internal oscillator. # Preparing Arduino IDE * [Install ATtinyCore](https://github.com/SpenceKonde/ATTinyCore). * Go to **Tools -> Board -> ATtinyCore** and select your chip (no bootloader). * Go to **Tools** and set the desired board options. * Connect your [ISP programmer](https://github.com/wagiminator/AVR-Programmer) to your PC and to the ICSP header of the board. * Go to **Tools -> Programmer** and select your ISP programmer (e.g. [USBasp](https://aliexpress.com/wholesale?SearchText=usbasp)). * Go to **Tools -> Burn Bootloader** to burn the fuses. * Open your sketch and click **Upload**. # References, Links and Notes * [ATtinyCore](https://github.com/SpenceKonde/ATTinyCore) * [ATtiny84A Datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny24A-44A-84A-DataSheet-DS40002269A.pdf)   # License  This work is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported License. (http://creativecommons.org/licenses/by-sa/3.0/)