The power module consists of 4 power output ports, multi-modal power input, internal rechargeable Li-ion battery, and a main power switch.
The power switch is located on the top corner of the right surface. It is a three-way switch, with the middle state corresponding to ‘OFF’. Sliding the switch in (to the left as seen in the figure) corresponds to ‘INT’ state, which means evive will be powered by the internal 3.7V battery. Sliding the switch outwards (to the right as seen in the figure) corresponds to ‘EXT’ state, which means evive will be powered by external power supplies through DC jack or power input pins.
With an 18650 Li-ion 3.7V 2600mAh rechargeable battery inside, evive can easily run for 6 hours on a single charge. The 3.7V is boosted to 5V, at a current rating of 1A. This battery also powers the RTC chip inside to keep time correctly and can run all the features of evive except motor output ports, which are disabled to prevent the flow of excess current from the battery.
Charging happens whenever an external power supply is connected and the battery is not being used. If the power supply is connected through DC jack or power input pins, it happens automatically, while if the power supply is through USB port, the power switch needs to be switched to ‘EXT’ state to charge the battery.
The orange LED below the screen glows to indicate charging. It takes about 7 hours to completely charge the battery. You can sense the battery voltage on Analog Pin A8. The battery voltage range is between 2.5V at discharged state and 4.2V at fully charged state.
Vbattery = ((Analog Value at pin A8)*5)1023
While evive is powered by a rechargeable 3.7V Li-ion battery, it also offers multiple modes of power input for the situations where you need higher voltage or current supply. Whenever evive is powered on, the red LED below the screen glows brightly.
The external voltage can be measured through analog pin A8 and can be formulated using the formula given below:
Vin = (Analog value at pin A8)*(5/1023)*[(68+10)/10]
Vin = (Analog value at pin A8)*0.0381
evive has four power output ports:
There are 2 power indication LEDs, both located below the TFT screen as shown below.