Arduino shield that adds Bluetooth Low Energy via a Nordic nRF51822-based module, interfacing over SPI at 4 MHz (5 pins: MISO, MOSI, SCK, CS on D8, IRQ on D7, RST on D4). Uses AT command set and supports GATT customization and OTA firmware updates.
Module supply input, regulated down to 3.3V
Common ground for power and logic
SPI clock, default connected to 2x3 ICSP SCK
SPI MISO, nRF51 to Arduino
SPI MOSI, Arduino to nRF51
SPI chip select, default digital 8
nRF51 interrupt to Arduino, default digital 7
Bluefruit module reset, default digital 4
SWD clock for advanced/debug use
SWD data for advanced/debug use
Factory reset pad, tie to ground while powering up
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| 5V | Arduino shield power header | Power | Module supply input, regulated down to 3.3V | 3.3-5V input |
| GND | Arduino shield power header | Ground | Common ground for power and logic | 0V |
| SCK | 2x3 ICSP header | SPI | SPI clock, default connected to 2x3 ICSP SCK | Arduino logic |
| MISO | 2x3 ICSP header | SPI | SPI MISO, nRF51 to Arduino | Arduino logic |
| MOSI | 2x3 ICSP header | SPI | SPI MOSI, Arduino to nRF51 | Arduino logic |
| CS | Arduino digital header D8 | SPI | SPI chip select, default digital 8 | Arduino logic |
| IRQ | Arduino digital header D7 | Signal | nRF51 interrupt to Arduino, default digital 7 | Arduino logic |
| RST | Arduino digital header D4 | Control | Bluefruit module reset, default digital 4 | Arduino logic |
| SWCLK | SWD pad | Unknown | SWD clock for advanced/debug use | 3V logic |
| SWDIO | SWD pad | Unknown | SWD data for advanced/debug use | 3V logic |
| F.RST | factory reset pad | Control | Factory reset pad, tie to ground while powering up |
Module supply input, regulated down to 3.3V
Common ground for power and logic
SPI clock, default connected to 2x3 ICSP SCK
SPI MISO, nRF51 to Arduino
SPI MOSI, Arduino to nRF51
SPI chip select, default digital 8
nRF51 interrupt to Arduino, default digital 7
Bluefruit module reset, default digital 4
SWD clock for advanced/debug use
SWD data for advanced/debug use
Factory reset pad, tie to ground while powering up
About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.
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