Electronics - Height Recorder
This is to tell you about the height recorder I built in the
second year. That would be September 2002.
Basically it had controlling electronics, a frame fixed to the wall for a slide, a stepper motor, a pulley mechanism that moves a Micro-switch with a over mounted on an Aluminum pipe... Aaargh!!!
Ill try to get pictures later. its dismantled somewhere in college waiting for me to find it and give it life again:)
basically the electronics consists of 3 sections:-
section 1:
Controller... produces a pulse train (oscillator hooked up around a Schmidt trigger NAND gate) and sends simultaneously to both the stepper driver and the counter. Direction is set/reset using limit switches mechanically placed on the slide and goes to an RS flip flop built around 2 more NOT gates...
section 2:
Stepper driver... simple enough... uses a decade counter to generate the pulse sequence and a DPDT relay to switch sequence for reversing direction.
section 3:
up/down counter... with built in display driver... must be set to proper height on each power on using a separate sync switch provided on the front panel... display is calibrated to work to a resolution of 1mm and is in centimeters
Mechanics://
Frame:
Scratch built as usual... designed as well... finally put some use to those silly MS flats they buy in the college and make us toil over in the first year:)
cut, welded, drilled holes and mounted on the wall.
Pulleys:
To fashion pulleys u need a lathe.. that's just what I got to use. course NOW, with silly ISO related imposition its not allowed for a Electrical guy to use the stuff in the Machine Shop. damn mechanical freaks think they know squat about 'em:)
String:
Crazy freakin' scheme to pull the cross bar from both sides using a SINGLE wheel... funniest was the way I had to get the rope from one side to go over the inner pulley on the OTHER side...
Cross Bar:
Alum pipe with grooves cut in the sides, a sheet for the switch to sit on, the contacts from a terminal block to extend the lever, a welding electrode as lever, twine at the other end to hold the lever at the BDC:)
If you're still in you're senses and want to know more... feel free to mail at mail@cselian.com
Basically it had controlling electronics, a frame fixed to the wall for a slide, a stepper motor, a pulley mechanism that moves a Micro-switch with a over mounted on an Aluminum pipe... Aaargh!!!
Ill try to get pictures later. its dismantled somewhere in college waiting for me to find it and give it life again:)
basically the electronics consists of 3 sections:-
section 1:
Controller... produces a pulse train (oscillator hooked up around a Schmidt trigger NAND gate) and sends simultaneously to both the stepper driver and the counter. Direction is set/reset using limit switches mechanically placed on the slide and goes to an RS flip flop built around 2 more NOT gates...
section 2:
Stepper driver... simple enough... uses a decade counter to generate the pulse sequence and a DPDT relay to switch sequence for reversing direction.
section 3:
up/down counter... with built in display driver... must be set to proper height on each power on using a separate sync switch provided on the front panel... display is calibrated to work to a resolution of 1mm and is in centimeters
Mechanics://
Frame:
Scratch built as usual... designed as well... finally put some use to those silly MS flats they buy in the college and make us toil over in the first year:)
cut, welded, drilled holes and mounted on the wall.
Pulleys:
To fashion pulleys u need a lathe.. that's just what I got to use. course NOW, with silly ISO related imposition its not allowed for a Electrical guy to use the stuff in the Machine Shop. damn mechanical freaks think they know squat about 'em:)
String:
Crazy freakin' scheme to pull the cross bar from both sides using a SINGLE wheel... funniest was the way I had to get the rope from one side to go over the inner pulley on the OTHER side...
Cross Bar:
Alum pipe with grooves cut in the sides, a sheet for the switch to sit on, the contacts from a terminal block to extend the lever, a welding electrode as lever, twine at the other end to hold the lever at the BDC:)
If you're still in you're senses and want to know more... feel free to mail at mail@cselian.com