OrangePI Zero PLC board

==Orange Pi Zero GPIO extension board=

Basic OrangePi-to-PLC extennsion board.

• 1.8A (3A) DC/DC module for Orange Pi and peripherals
• 2 opto-isolated inputs (via Schmidt trigger inverter)
• 4 (3 if IRQ pin used for NRF24L01+) non-isolated inputs (via Schmidt trigger inverter)
• 2 Open Drain outputs
• I2C bus 3.3V
• I2C bus 5V
• Dallas (Maxim) 1-Wire bus via DS2482-100 (5V)
• on-board 2KiB FRAM IC (I2C)
• on-board NRF24L01+ module
• (on-board) DS3231 RTC module (not routed, placed direct on Orange Pi pins, use "RaspberryPI RTC module")