The Raspberry Juice serves as a power switch for the Raspberry Pi. This expansion board can turn the power on or off at a scheduled time.
The Juice always uses about 2mA/10mW. The board is rated for a maximum current of 1A.
The Raspberry Juice can be found using I2C or SPI at address 0xA4, and has the following read ports:
|Port||Returned value (in milliseconds)|
|0x20||Time until power off|
|0x21||Time until power on|
Additionally, the following can be written to the Juice:
|0x20||Set the time in milliseconds until power off|
|0x21||Set the time in milliseconds until power on|
So, for instance, writing 10000 to port 0x21 and 1000 to 0x20 will cut the power in 1 second, and then turn on the power 9 seconds later.