This module can be used for building keyboards such as Mitosis and Chimera

Core51822 (B) is a wireless module based on nRF51822 - the Multiprotocol Bluetooth® 4.0 low energy/2.4 GHz RF SoC designed for ULP (ultra low power) wirelesss applications.

Core51822 (B) Specifications

• Onboard chip: nRF51822
• Communication distance (open outdoor@1M data rate): 30m
• Frequency range: 2.4GHz
• Operating voltage: 2.0V ~ 3.6V
• Operating temperature: -40℃ ~ 85℃
• Dimension (PCB): 17.0mm x 20.8mm
• Expansion pinheader: all the I/Os except P0.26 and P0.27
• Antenna: onboard antenna

nRF51822 Features

• 2.4 GHz multiprotocol RF transceiver
• ARM® Cortex™-M0 32 bit processor
• 128 bit AES HW encryption
• 256kB flash & 32kB RAM
• Programmable Peripheral Interconnect (PPI)
• Digital interfaces: SPI, I2C, UART
• 10 bit ADC
• Programmable output power: -20 to +4 dBm
• Independent application development and protocol stack
• Fully compatible with NRF24L series
• Pinout compatible with NRF51xxx series
• Global separate power management
• Operating voltage: 1.8 V ~ 3.6 V