ATTiny

Table of Contents

• Hardware Configuration
  • ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 4
  • ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 3 - PB3 and PB4 are free to use for application
  • ATtiny24/44/84 Pin map with CE_PIN 8 and CSN_PIN 7
  • ATtiny2313/4313 Pin map with CE_PIN 12 and CSN_PIN 13

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

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 for the ATTiny patch.

ATTiny board support initially added from jscrane/RF24

Hardware Configuration

By tong67

ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 4

                             +-\/-+
               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
• 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

                                                                                       ^^
                             +-\/-+           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

                              +-\/-+
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

                              +-\/-+
                        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
                              +----+