elevation system, you're good, give me an email. If you want to give it a try, let me know by email. I have a beta version with Soft-Start / Soft-Stop for AC motors, taking advantage of this AC-Dimmer module, but right now it only works for azimuth. Plot of Power output corresponding to Angle error There's an adjustable Dead Zone, where the antenna doesn't move for the slightest target offset. Therefore, when the antenna starts moving, it accelerates progressively, and, when approaching the desired position, it slows down until full stop. It outputs a power response proportional with angle error (TargetAntenna). The DC motors version has the advantage of using PWM for a softer/smoother antenna movement. The later one can be interfaced with existing commercial antenna rotators. You will find here two versions: One for DC motors, and one for AC motors (just relays). If you press the button of the Azimuth encoder, all antenna movement stops immediately, and the azimuth command can be set in 10deg. The code doesn't use any library (except for the LCD) and runs exactly as is, with pins according to the electric diagram below. The controller outputs a response on serial, for the tracking software to display the real antenna position on the screen. It works directly with Orbitron, with a DDE plugin from It's compatible with all tracking software using Eas圜omm2 protocol / 9600 bauds. It can automatically track satellites, when connected by USB to a PC running satellite tracking software.
The Controller accepts manual positioning of the antenna, by means of two rotary encoders, Azimuth and Elevation. This project started as an entertainment and became a serious piece of equipment.
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