The RFD22301 is a great BLE Arduino microcontroller, but to make this project even better i would like to make it smaller, cheaper, lower power. Making it cheaper would be easy if i didn't want it to be Arduino compatible, so for the moment i would just like to make it smaller and lower power. This is why i have decided to make a new board with the Simblee BLE micrcontroller, which is actually made by the same company that makes the Rfduino. It is only 7mm by 10mm (compared to the 15.24mm by 15.24 mm of the RFD22301 ), and uses as low as 8mA for TX and 10mA for RX (compared to 12mA for RX and 12mA for TX )

I will initially be putting the Simblee onto a MiniWear compatible board, so the acutally PCB size won't change very much. But in theory it could be a lot smaller.

If you are interested, here are some Simblee specs copied from their website:

• Bluetooth® Smart
• Simblee interference immunity
• 3ms latency
• 10us accuracy (jitter)
• Physical range adjustable from a few inches to hundreds of feet
• Build iPhone and Android apps without Xcode or the Android SDK
• FCC, IC, CE, TELEC compliance approved
• Built in AES encryption engine
• 7mm x 10mm x 2.2mm
• 29 GPIOs (flexible pin configuration)
• <3uA ULP with clock running (run for years on a coin cell)
• 600nA ULP Sleep mode
• 8mA TX @ 0dBm
• 12mA TX @ +4dBm
• 10mA RX
• -93dBm receiver sensitivity
• -55dBm to +4dBm TX power
• ARM Cortex M0 processor
• Flash code space available for user application (no need for external controller)
• 6x ADC inputs, 4x PWM outputs, 2x SPI master/slave, 2x I2C, 1 x UART
• Temperature sensor
• Battery/Supply voltage monitoring
• Onchip UART bootloader
• OTA programming with hardware OTA disable
• Integrated 16 MHz crystal and 32KHz precision crystal
• Integrated antenna
• Integrated shield