First you will need a build a circuit to drive the solenoid through a mosfet as most MCU will not be able to provide the current needed to drive the coil in the solenoid.
[Wiring diagram provided by Adafruit](https://playground.arduino.cc/uploads/Learning/solenoid_driver.pdf)
Beware that some pins may be powered during bootloader (ie. A13 on the STM32F303 chip) and will result in the solenoid kept in the on state through the whole flashing process. This may overheat and damage the solenoid. If you find that the pin the solenoid is connected to is triggering the solenoid during bootloader/DFU, select another pin.
### DRV2605L
DRV2605L is controlled over i2c protocol, and has to be connected to the SDA and SCL pins, these varies depending on the MCU in use.
#### Feedback motor setup
This driver supports 2 different feedback motors. Set the following in your `config.h` based on which motor you have selected.
##### ERM
Eccentric Rotating Mass vibration motors (ERM) is motor with a off-set weight attached so when drive signal is attached, the off-set weight spins and causes a sinusoidal wave that translate into vibrations.
#define FB_LOOPGAIN 1 /* For Low:0, Medium:1, High:2, Very High:3 */
/* Please refer to your datasheet for the optimal setting for your specific motor. */
#define RATED_VOLTAGE 3
#define V_PEAK 5
```
##### LRA
Linear resonant actuators (LRA, also know as a linear vibrator) works different from a ERM. A LRA has a weight and magnet suspended by springs and a voice coil. When the drive signal is applied, the weight would be vibrate on a single axis (side to side or up and down). Since the weight is attached to a spring, there is a resonance effect at a specific frequency. This frequency is where the LRA will operate the most efficiently. Refer to the motor's datasheet for the recommanded range for this frequency.
#define FB_LOOPGAIN 1 /* For Low:0, Medium:1, High:2, Very High:3 */
/* Please refer to your datasheet for the optimal setting for your specific motor. */
#define RATED_VOLTAGE 2
#define V_PEAK 2.8
#define V_RMS 2.0
#define V_PEAK 2.1
#define F_LRA 205 /* resonance freq */
```
#### DRV2605L waveform library
DRV2605L comes with preloaded library of various waveform sequences that can be called and played. If writing a macro, these waveforms can be played using `DRV_pulse(*sequence name or number*)`
List of waveform sequences from the datasheet:
|seq# | Sequence name |seq# | Sequence name |seq# |Sequence name |
