Posted by Majorman on November 16, 2023 at 08:17:25 from (86.190.123.219):
In Reply to: Re: Majorman controls posted by Janicholson on November 16, 2023 at 06:42:59:
This is what started my career in electronics way back in the early 1970's, a combine harvester forward speed control that adjusted forward speed around a set point based on engine and machine loading and the grain loss at the straw walkers, wind blast and sieve pan. Took it to Claas and spent five years developing it on their machines. It worked well but, at that time, operators did not like their machine being controlled by a green box in the corner of the cab.
Then I got into designing and building controls for other agricultural machines. This control panel from 2000 was used on a potato harvester. First time a touch control system had been used but all the buttons are membrane switches and control a thyristor based system to latch circuits on and off. Joysticks were used to control elevator functions and potentiometers to control web speeds.
This is another design from the early 2000's for a crop sprayer. The sprayer used three separate spray booms in one so that if different rates were required for, say, liquid fertiliser, all three could be switched on to increase the application rate, or switched off as required. Then there were the individual boom section controls. This again, used thyristor for switching and holding on valves as required from a push button controller on the hydrostatic drive controller, within reach of the drivers thumb. All this now is done with a chip today, but this system is repairable by, say a local TV or radio repair man who does not need special tools or programs. I do not think we ever had a failure on this control so it was pretty robust and many were sold.
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