The module uses well known MAX232 chip and is intended as a level converter. It uses RX/TX signals and a pair of flow control signals (selectable by jumpers). Original RS232 signals are available on header pins.
The module allows the generation of PWM signal, which can be adjusted using the I2C interface. The module has eight outputs that can run simultaneously on two frequencies in the range of 0.59 Hz - 152 Hz (with 1.69 - 6.58 ms).
This GPIO expander module is designed for 1.65 to 5.5 V operation. It provides general-purpose remote I/O expansion via the I²C interface.The module consists of two 8-bit Configurable, Input Port, Output Port, and Polarity Inversion registers.