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# ATTiny
@tableofcontents
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)
See the included rf24ping85 example for pin info and usage
@warning The ATTiny2313 is unsupported due to lack of sufficient memory resources
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.
ATTiny board support initially added from [jscrane/RF24](https://github.com/jscrane/RF24)
## Hardware Configuration
By [tong67](https://github.com/tong67)
### ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 4
```text
+-\/-+
NC PB5 1|o |8 Vcc --- nRF24L01 VCC, pin2 --- LED --- 5V
nRF24L01 CE, pin3 --- PB3 2| |7 PB2 --- nRF24L01 SCK, pin5
nRF24L01 CSN, pin4 --- PB4 3| |6 PB1 --- nRF24L01 MOSI, pin6
nRF24L01 GND, pin1 --- GND 4| |5 PB0 --- nRF24L01 MISO, pin7
+----+
```
### ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 3 - PB3 and PB4 are free to use for application
- Circuit idea from [NerdRalph's 3 pin solution](http://nerdralph.blogspot.ca/2014/01/nrf24l01-control-with-3-attiny85-pins.html)
- Original RC combination was 1K/100nF. 22K/10nF combination worked better.
- For best settle-time delay value in `RF24::csn()` the timingSearch3pin.ino sketch can be used.
- This configuration is enabled when CE_PIN and CSN_PIN are equal, e.g. both 3
- Because CE is always high the power consumption is higher than for 5 pins solution
```text
^^
+-\/-+ nRF24L01 CE, pin3 ------| //
PB5 1|o |8 Vcc --- nRF24L01 VCC, pin2 ------x----------x--|<|-- 5V
NC PB3 2| |7 PB2 --- nRF24L01 SCK, pin5 --|<|---x-[22k]--| LED
NC PB4 3| |6 PB1 --- nRF24L01 MOSI, pin6 1n4148 |
nRF24L01 GND, pin1 -x- GND 4| |5 PB0 --- nRF24L01 MISO, pin7 |
| +----+ |
|-----------------------------------------------||----x-- nRF24L01 CSN, pin4
10nF
```
### ATtiny24/44/84 Pin map with CE_PIN 8 and CSN_PIN 7
- Schematic provided and successfully tested by [Carmine Pastore](https://github.com/Carminepz)
```text
+-\/-+
nRF24L01 VCC, pin2 --- VCC 1|o |14 GND --- nRF24L01 GND, pin1
PB0 2| |13 AREF
PB1 3| |12 PA1
PB3 4| |11 PA2 --- nRF24L01 CE, pin3
PB2 5| |10 PA3 --- nRF24L01 CSN, pin4
PA7 6| |9 PA4 --- nRF24L01 SCK, pin5
nRF24L01 MISO, pin7 --- PA6 7| |8 PA5 --- nRF24L01 MOSI, pin6
+----+
```
### ATtiny2313/4313 Pin map with CE_PIN 12 and CSN_PIN 13
```text
+-\/-+
PA2 1|o |20 VCC --- nRF24L01 VCC, pin2
PD0 2| |19 PB7 --- nRF24L01 SCK, pin5
PD1 3| |18 PB6 --- nRF24L01 MOSI, pin6
PA1 4| |17 PB5 --- nRF24L01 MISO, pin7
PA0 5| |16 PB4 --- nRF24L01 CSN, pin4
PD2 6| |15 PB3 --- nRF24L01 CE, pin3
PD3 7| |14 PB2
PD4 8| |13 PB1
PD5 9| |12 PB0
nRF24L01 GND, pin1 --- GND 10| |11 PD6
+----+
```
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