This is a new version of firmware v170, v171, v172, and v173. The options are now contained in the firmware version and are visible in the new wheel control v2.0 (it is required for this firmware). This firmware is not compatible with older wheel control versions. The new feature of this firmware is an addition of Hat Switch in the HID, which you can use with the firmware version that has "h" option. Other small improvements and bug fixes regarding encoder z-index functionality are implemented as well.
Firmware option description:
a - automatic calibration for pedal axis
z - encoder Z-index support
h - enabled Hat Switch
v173 has analog FFB output with two 12bit external i2C DAC - MCP4725 (recommended for DD wheels)
Leonardo MCP4725_L MCP4725_R
5V VCC VCC
gnd GND GND
2 SDA SDA
3 SCL SCL
DAC ffb_force i2C_address address_pin
0 left 0x60 GND
1 right 0x61 VCC
Recommended is DAC+- mode and the usage of a differential amplifier in order to buffer and amplify the outputs up to the required input level of AASD (ac servo drive motor controller).