Modules
Stepper Motor Driver Module, DRV8825
The DRV8825 stepper motor driver can drive one bipolar stepper motor at up to 2.2A with adequate cooling. The module can easily handle 1.5A with no heatsink. A small heatsink is included and with a little air flow, it can handle up to the full 2.2A. Note that the driver IC can handle up to 2.5A, but the 0.1 ohm current sense resistors limit the output to 2.2A.
Capacitive Touch Sensor Board, MPR121
This is a breakout board for Freescale’s MPR121QR2. The MPR121 is a capacitive touch sensor controller driven by an I2C interface. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs.
Bluetooth Low Energy Module n51822
The Seeed nRF51822 Module is a low-cost ARM cortex-m0 based module for Bluetooth® Smart designs with the nRF51822 SoC. The module gives access to at most 23 GPIO pins via pin pads and incorporates an onboard PCB antenna to minimize the material cost but also with a good performance. The application engineers can easily apply the module for their application without worrying about the specific impedance matching or soldering fine pitch related radio designing issues.
