| 1 | # ATTiny |
| 2 | |
| 3 | @tableofcontents |
| 4 | |
| 5 | ATTiny support for this library relies on the SpenceKonde ATTinyCore. Be sure to have added this core to the Arduino Boards Manager with [this install guide](http://highlowtech.org/?p=1695) |
| 6 | |
| 7 | See the included rf24ping85 example for pin info and usage |
| 8 | |
| 9 | @warning The ATTiny2313 is unsupported due to lack of sufficient memory resources |
| 10 | |
| 11 | Some versions of Arduino IDE may require a patch to allow use of the full program space on ATTiny. See [this resource](https://github.com/TCWORLD/ATTinyCore/tree/master/PCREL%20Patch%20for%20GCC) for the ATTiny patch. |
| 12 | |
| 13 | ATTiny board support initially added from [jscrane/RF24](https://github.com/jscrane/RF24) |
| 14 | |
| 15 | ## Hardware Configuration |
| 16 | |
| 17 | By [tong67](https://github.com/tong67) |
| 18 | |
| 19 | ### ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 4 |
| 20 | |
| 21 | ```text |
| 22 | +-\/-+ |
| 23 | NC PB5 1|o |8 Vcc --- nRF24L01 VCC, pin2 --- LED --- 5V |
| 24 | nRF24L01 CE, pin3 --- PB3 2| |7 PB2 --- nRF24L01 SCK, pin5 |
| 25 | nRF24L01 CSN, pin4 --- PB4 3| |6 PB1 --- nRF24L01 MOSI, pin6 |
| 26 | nRF24L01 GND, pin1 --- GND 4| |5 PB0 --- nRF24L01 MISO, pin7 |
| 27 | +----+ |
| 28 | ``` |
| 29 | |
| 30 | ### ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 3 - PB3 and PB4 are free to use for application |
| 31 | |
| 32 | - Circuit idea from [NerdRalph's 3 pin solution](http://nerdralph.blogspot.ca/2014/01/nrf24l01-control-with-3-attiny85-pins.html) |
| 33 | - Original RC combination was 1K/100nF. 22K/10nF combination worked better. |
| 34 | - For best settle-time delay value in `RF24::csn()` the timingSearch3pin.ino sketch can be used. |
| 35 | - This configuration is enabled when CE_PIN and CSN_PIN are equal, e.g. both 3 |
| 36 | - Because CE is always high the power consumption is higher than for 5 pins solution |
| 37 | |
| 38 | ```text |
| 39 | ^^ |
| 40 | +-\/-+ nRF24L01 CE, pin3 ------| // |
| 41 | PB5 1|o |8 Vcc --- nRF24L01 VCC, pin2 ------x----------x--|<|-- 5V |
| 42 | NC PB3 2| |7 PB2 --- nRF24L01 SCK, pin5 --|<|---x-[22k]--| LED |
| 43 | NC PB4 3| |6 PB1 --- nRF24L01 MOSI, pin6 1n4148 | |
| 44 | nRF24L01 GND, pin1 -x- GND 4| |5 PB0 --- nRF24L01 MISO, pin7 | |
| 45 | | +----+ | |
| 46 | |-----------------------------------------------||----x-- nRF24L01 CSN, pin4 |
| 47 | 10nF |
| 48 | ``` |
| 49 | |
| 50 | ### ATtiny24/44/84 Pin map with CE_PIN 8 and CSN_PIN 7 |
| 51 | |
| 52 | - Schematic provided and successfully tested by [Carmine Pastore](https://github.com/Carminepz) |
| 53 | |
| 54 | ```text |
| 55 | +-\/-+ |
| 56 | nRF24L01 VCC, pin2 --- VCC 1|o |14 GND --- nRF24L01 GND, pin1 |
| 57 | PB0 2| |13 AREF |
| 58 | PB1 3| |12 PA1 |
| 59 | PB3 4| |11 PA2 --- nRF24L01 CE, pin3 |
| 60 | PB2 5| |10 PA3 --- nRF24L01 CSN, pin4 |
| 61 | PA7 6| |9 PA4 --- nRF24L01 SCK, pin5 |
| 62 | nRF24L01 MISO, pin7 --- PA6 7| |8 PA5 --- nRF24L01 MOSI, pin6 |
| 63 | +----+ |
| 64 | ``` |
| 65 | |
| 66 | ### ATtiny2313/4313 Pin map with CE_PIN 12 and CSN_PIN 13 |
| 67 | |
| 68 | ```text |
| 69 | +-\/-+ |
| 70 | PA2 1|o |20 VCC --- nRF24L01 VCC, pin2 |
| 71 | PD0 2| |19 PB7 --- nRF24L01 SCK, pin5 |
| 72 | PD1 3| |18 PB6 --- nRF24L01 MOSI, pin6 |
| 73 | PA1 4| |17 PB5 --- nRF24L01 MISO, pin7 |
| 74 | PA0 5| |16 PB4 --- nRF24L01 CSN, pin4 |
| 75 | PD2 6| |15 PB3 --- nRF24L01 CE, pin3 |
| 76 | PD3 7| |14 PB2 |
| 77 | PD4 8| |13 PB1 |
| 78 | PD5 9| |12 PB0 |
| 79 | nRF24L01 GND, pin1 --- GND 10| |11 PD6 |
| 80 | +----+ |
| 81 | ``` |