The controller uses two stages charging algorithm.
Solar panel arduino charger.
Arduino pv mppt solar charger gpl3 there are many charge controllers available but ordinary cheap ones are not efficient enough to use with maximum power from solar panels.
Attach your two ldr s to each side of the solar panel east and west and solder one end of a jumper wire to each of their leads.
You may use various batteries that has the voltage of 3 0v 4 2v to shift up for 5v output or put on li ion battery and solar panel to form an autonomous sensor unit.
The following design is for a solar battery charger ran by an arduino nano.
The redline is for power and yellow line is for control signal.
Sleep saves battery however the sensors and power regulators 7805 will still consume battery in idle mode draining the battery.
This uses the energy from some solar cells to charge the batteries and boosts the voltage from it to the 5v used by the arduino uno.
Furthermore the design has been tested and runs with 90 efficiency under 70ᵒc 158ᵒf.
According to these voltage levels it decides how to charge the battery and control the load.
First you ll have to assemble the solar powered battery charger circuit.
It can take up to 20v on the input site of the charger.
A time switching battery powered solar charged circuit used to power an arduino uno and some peripherals.
It can handle a standard lead acid 12v battery like for a scooter or a car.
Its easier to solder a jumper wire if you cut the end off one side and strip the lead about 5mm to expose the wires.
This project can also solve the efficiency issue of arduino when in sleep.
The amount of charging current is determined by the difference between battery voltage and charge setpoint voltages.
The arduino senses the solar panel and battery voltages by using two voltage divider circuits.
In the above picture there is typographical error in power and control signal.
This circuit was based on the awesome tutorial by deba168 solar powered arduino weather station.
According to these voltages it decides how to charge the battery and control the load.
For the arduino to read the ldr s we need a voltage divider circuit for each.
Attach your two ldr s to each side of the solar panel east and west and solder one end of a jumper wire to each of their leads.
The arduino mcu senses the solar panel and battery voltages.
The solar charger is a stackable shield to arduino compatible platforms enables adaptive battery power and act as energy harvester for in field charging.
Solar charged battery powered arduino uno project in progress by igor fonseca albuquerque microcontroller based solar pv system s charge controller inverter powerbank led lamp with menu based navigation system on lcd display.
