fixed pwm-exp delay range, added emphasis on floating point input for pwm-exp
fixed pwm-exp delay range, added emphasis on floating point input for pwm-exp

OnionIoT/i2c-exp-driver,OnionIoT/i2c-exp-driver,OnionIoT/i2c-exp-driver,OnionIoT/i2c-exp-driver,OnionIoT/i2c-exp-driver