... conversion from 0-2.5V, however this can easily be scaled by feeding from a suitable attenuator. PIC Tutorial Seven - RS232 RS232 Board This is the RS232 board, it uses a MAX232 5V to RS232 converter ... converts the 0-5V TTL levels at the PIC pins to the +12V/-12V levels used in RS232 links. As is common with these devices it inverts the data during the conversion, the PIC USART hardware is designed ... clock is running on it's back-up battery). PIC Tutorial - I2C Clock Board I2C Clock Board This is the I2C Clock Board, it uses a PCF 858 3P, which is a real time, battery backed, CMOS...