User's Manual

GEM 2 Module Hardware Integration Guide Version 0.1

Wahoo Fitness

90 West Wieuca Road, Suite 110

Atlanta, GA 30342

www.wahoofitness.com

1‐877‐978‐1112

Overview and Key Features

The GEM module has been designed to allow OEMs to easily add Bluetooth and ANT+

wireless connectivity in their product offering. The GEM 2 module incorporates Wahoo

Fitness software specifically designed to enable fitness machines such as treadmills,

exercise bikes, ellipticals, rowers, stair climbers and step machines to wirelessly

communicate exercise data with smart phone or tablets as well as leaderboard software

systems. For applications other than fitness machines, developer’s can use Nordic

Semiconductor’s SDK to create their own embedded application specific software.

The GEM 2 module is based on Nordic Semicondutor’s nRF52832 multiprotocol Bluetooth

and ANT+ chipset. The GEM 2 module offers a variety of peripheral interfaces including

UART, SPI, I2C, ADC, and GPIO, has a maximum transmit power of +4dBm, and a sensitivity

of ‐96dBm. This manual is intended to assist hardware integration of the GEM2module

into a given design. Details on Wahoo’s GEMSAFE and GEMHCI software can be found

www.wahoogy.com. For applications using Nordic Semiconductor SDK, please refer to

Nordic Semiconductor’s SDK available at developer.nordicsemi.com.

Features

• ‐96 dBm sensitivity

• TX Power‐20 to +4dBm in 4dB steps

•xxmlineofsightrange

•5.3mApeakTX@0dB

•5.4mApeakRX

• 1dB dB RSSI resolution

•ARM®Cortex

M4F 32 bit processor running at 64MHz

• 512 kB embedded flash memory and 64 kB RAM

• Onboard NFC for Out of Band pairing

• Peripheral Interfaces: ADC, GPIO, SPI, I2C, UART, Low power comparator,

Temperature sensor 

•AESHWencryption

• FCC, CE, IC certified

• Integrated Antenna

• RoHS compliant

• Bluetooth End Product Listed

• Integrated Fitness Equipment Firmware and mobile application