Witty Pi 3 Mini adds RTC (DS3231SN) and power management to your Raspberry Pi, and can define complex ON/OFF sequence with simple script.
After installing Witty Pi 3 Mini on your Raspberry Pi, you get some amazing new features:
- You can gracefully turn on/off Raspberry Pi with single tap on the switch.
- After shutdown, Raspberry Pi and all its USB peripherals’ power are fully cut.
- Raspberry Pi knows the correct time, even without accessing the Internet.
- Raspberry Pi knows the temperature thanks to the sensor in RTC chip.
- You can schedule the startup/shutdown of your Raspberry Pi.
- You can even write a script to define complex ON/OFF sequence.
- Monitor external voltage and turn on/off your Raspberry Pi accordingly.
Witty Pi 3 Mini supports all Raspberry Pi models that has the 40-pin GPIO header, including A+, B+, 2B, Zero, Zero W, 3B, 3B+, 3A+ and 4B.
Witty Pi 3 Mini uses the same software with Witty Pi 3. You just need to run these two commands in your Raspberry Pi to install the software:
pi@raspberrypi:~ $ wget http://www.uugear.com/repo/WittyPi3/install.sh
pi@raspberrypi:~ $ sudo sh install.sh
Comparing to Witty Pi 3, Witty Pi 3 Mini uses the same RTC chip (DS3231SN) and same micro-controller (ATtiny841). The main difference is the LDO voltage regulator (LM29150) is not populated on Witty Pi 3 Mini. This reduces the cost for those who don’t need this LDO, and also make things easier to integrate a different DC/DC module into Witty Pi 3 Mini.
Unlike Witty Pi 3 which uses a 3V button battery for off-power time keeping, Witty Pi 3 Mini uses a super capacitor (0.08F, or 80000uF) for this purpose.
You can find more information in its user manual: http://www.uugear.com/doc/WittyPi3Mini_UserManual.pdf
Each Witty Pi 3 Mini package contains:
- Witty Pi 3 Mini board x 1
- M2.5 x 10mm plastic screw x 4
- 4mm spacer x 4
- M2.5 plastic nut x 4
|Dimension:||65mm x 30mm x 4mm|
|Weight||8g (net weight)|
|Micro Controller||ATtiny841 (datasheet)|
|Realtime Clock||DS3231SN (datasheet)|
|LED Indicator||Red LED: lights up when Raspberry Pi gets powered.|
|White LED: lights up for a few seconds when a shutdown command is received, or blinks when device is standing by.|
|Connector||20×2 surface-mounted header with 2.54 mm pitch and 2mm plastic height.|
|Micro USB female connector as 5V DC input.|
|Unpopulated 7-pin header for extension or integration.|
|Unpopulated 3-pin header/connector for VIN, GND and 5V.|
|Time Keeping||Using 0.08F super capacitor as time keeping power source. Allows about 17 hours off-power time keeping.|
|Power In||DC 5V (via micro USB). Possible to connect external DC/DC converter (not included) and also have VIN monitored.|
|Output Current||Up to 2.5A for Raspberry Pi and its peripherals. If using external DC/DC converter, the output current is also limited by the capability of DC/DC converter.|
|Standby Current||~ 1mA|
|Operating Temperature||-30℃~80℃ (-22F~176F)|
|Storage Temperature||-40℃~85℃ (-40F~185F)|
|Humidity||0~80%RH, no condensing|
FIRMWARE AND SOFTWARE
Witty Pi 3 Mini uses the same firmware and software with Witty Pi 3.
The source code of firmware and software can be found on Github: https://github.com/uugear/Witty-Pi-3
SCHEDULE SCRIPT GENERATOR
You can now use this web app to create and debug the schedule script for Witty Pi.
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