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Here is the tracker control system in its deployment configuration – the card is the same size as an Arduino Uno . Socket at left holds the Arduino Pro Mini clone (ATmega328 5V 16Mhz). Socket at right holds the A4988 Stepper Motor Driver Carrier. Single 2-pole screw terminal block, right front, connects to the HOME sensor switch. The pair of 2-pole screw terminal blocks, right rear, connect to the four leads of the stepper motor.
The 6-pin right-angle header on the nearside of the Arduino Pro Mini clone can be connected to a USB-to-Serial converter, but is only used to download programs from a PC onto the Arduino.
Note the 9 VDC battery cap. I intend to power this system from an external power tank, because I plan to add a current hungry, FET-driven, anti-dew heater controller to the empty real estate on the board. However, for the time being, what with the stepper motor being powered at a 0.8% duty cycle, I actually think I can run the tracker for several hours on a standard 9V battery.
Marcus, stopped in his (and an ATV's) tracks on the beach.
Sony DSLR-A200
0.001 sec (1/1000); f/5.6; 55 mm; ISO 200
Spc. Derek Sparks, a track vehicle mechanic, with Company D, 106th Support Battalion, takes off a track pad of a M1A1 Abrams Tank near Oro Grande N.M., May 21, 2018. Sparks and his crew were called to fix the tank after it broke its track on it’s way to conduct live fire. (U.S. Army National Guard photo by Sgt. Brittany Johnson.)
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SB Rail DR73915 between Cupar and Ladybank working STP 6T44 Aberdeen Craiginches C. Rail to Slateford. 17 October 2018.