MISC Expander Shield for Raspberry Pi

Description The board includes follwoing functions 0.96” SPI connected OLED interface. DS3231 RTC I2C real time clock, also on board battery socket. PCF8591 analog input and output expander,  lead out following extra pins: AOUT – also have on board programmable LED AIN0 AIN1 – connect to analog sensor socket, with pull up resistor, via jumper. Default include lightcell sensor AIN2 AIN3 – connected to on board trim-pot potentiometer, via jumper. GND PCF8574 GPIO expander, lead out following extra GPIOs, with break out pin header L0 – joystick left – via SMD jumper L1 – joystick down – via SMD jumper L2 – joystick right – via SMD jumper L3 – joystick up – via SMD jumper L4 – on board LEDs L5 L6 L7 – buzzer – via SMD jumper Raspberry pin IO26 / P25 controlled LED. Infrared receiver via IO18 / P1 raspberry pi, support LIRC software Reserved DS18B20 temperature sensor socket, at IO4/ P7. On board power LED. Schematic please see on this page, demo code please find here (misc).