This is Version TWO of the USB PowerControl. Version ONE is here.
Note: If you leave the Grove Connector unconnected, Version Two behaves exactly like Version One.
The USB PowerControl board is a USB to USB solid state relay. It is is a digitally controlled power switch for your Arduino or Raspberry Pi. It is a Pi On and Off switch.
We have now added a Grove Digital Input that allows you to control the USB PowerControlV2 using two GPIO Lines (one enable and one control line) to switch on and off from a Grove Digital Port. The Grove Enable Line, when high, disables the LIPOBATIN line and makes control of the device under the Grove Control Line. When the Grove Enable Line is low, the LIPOBATIN line controls the relay as in the original USB PowerControl. The Grove Enable Line is pulled down by a 43K resistor so if it is disconnected, the USB PowerControlV2 is compatible with the original USB PowerControl.
- Can Switch the Power to any plugged into the Female A USB port
- On/Off Controlled by a single control line Implements Hysteresis on Control line
- 3.8V/3.3V Turn On/Off Voltage with LIPOBATIN
- Grove Digital Connector - ENABLE and CONTROL your USB Port
- Over Current Protection
- Thermal Shutdown
- Reverse Current Blocking
- Can be connected to GPIO Pin or directly to LiPo Battery
- Supports both Arduino and Raspberry Pi
- Has Dual USB ports - no more cutting USB cables
- Will work with SunAir and SunAirPlus Solar Power Controllers
- Making the USB PowerControl on by Default, when connected to a GPIO that needs to be initialized (like the Pi and Arduino GPIOs)
- Turning off the USB PowerControl even if the battery is higher than ~3.3V and lower than ~3.8V.
- Controlling the USB PowerControl with a 3.3V GPIO Line, WITHOUT a buffer.
Grove GPIO Control Circuitry for the USB PowerControl
This circuitry is provided to allow the USB PowerControlV2 to be controlled by either LIPOBATIN or the state of the CONTROL Line (J3 Pin 1). ENABLE (J3 Pin 2) controls whether the USB POWERCONTROLV2 is switched by LIPOBATIN or the CONTROL line. Remember that LIPOBATIN is not a digital input. It is designed to look at the voltage level of the battery.
The truth table for the USB PowerControl V2 is given below:
Where is TP3 / COut on the USB PowerControl Board?
The WatchDog board and the USB PowerControl board are often used together.
If you look at the pin locations diagram in the USB PowerControl specification, you will see the TP3 test pad marked. This is the COut / TP3 signal mentioned in the specification. It is also clearly marked on the board itself. Since it is in an image, a keyword search will not find it.
An Instructable for Building a Complete Raspberry Pi Weather Station using the USB PowerControl
Block and Application Diagrams
USB PowerControl Application Diagram