For a full build guide visit: https://browndoggadgets.dozuki.com/Guide/Dual+Axis+Solar+Tracker+3.0/382
The new (as of October 2021) Digital I/O Shield is a general purpose Arduino shield and replaces the old version of the Solar Tracker Shield. Any Solar Tracker sold after October 2021 will use the Digital I/O Shield and will require that you use the Arduino sketch Dual_Axis_Tracker_V3.ino
(The old Solar Tracker Shield was used previous to the release of the Digital I/O Shield in October 2021. If you are using this older version of the Solar Tracker Shield you will need to use the Arduino sketch Dual_Axis_Tracker_V2.ino)
The Light-Detecting Resistor (LDR) Board is a board with four photocells and male pin headers. It connects to the Digital I/O Shield with female jumper wires.
Both of the shields work with the Arduino Uno board and have male pin headers for connecting the servos and light detecting resistors (via female jumper wires).
The Arduino sketch Servo_Test.ino should be used to ensure your servos both work once connected to the shield. (The Arduino and shield must be powered for the servo test to work.)
The Arduino sketch Servo_Set_Mid.ino will set both servos to the 90 degree (mid) point and is useful to run before doing assembly of the tracker.
The majority of screws are 3/4th inch 8-32 pan head screws, one 1/2th inch 8-32 screw, one 2-1/2th inch 8-32 screw, along with four #2 wood screws to mount the servos, two M3 screws to mount the Arduino Uno, and two M3 screws to mount the battery holder. Rubber feet are necessary for the bottom of the base.
Use a laser cutter or CNC router to cut the parts out. Use 1/4th inch and 1/8th inch plywood for this project. A 1 inch by 1 inch reference square has been put on the laser cut design to to allow for adjustment if importing causes resizing problems.