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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Home made positioner
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<blockquote data-quote="bifferos" data-source="post: 164695" data-attributes="member: 196106"><p>Right-hand pic:</p><p></p><p>This is the whole thing. There's a board glued to the top of an ATX PSU (don't ask - from another project<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />). The relay board (top-right) was bought as a kit off ebay. Bottom-left goes to the PC serial port, bottom right to the dish.</p><p></p><p></p><p>Left-hand pic:</p><p></p><p></p><p>This is the bit that does the business. I didn't really need the LED, but thought it might be useful to see the pulses from the actuator. The big fat resistor at the back is to stabilise the PC power supply (ATX PSUs don't like being run not connected to a PC!). The bits you can't do without are the two opto-isolators, two diodes (betwen the two optos) and three resistors.</p><p></p><p>You can make a very similar circuit to interface to the parallel port. I went for serial, because my PC has two serial ports and only one parallel (an extra chance in case I blew it up<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite69" alt=":-ohmy" title="Oh My :-ohmy" loading="lazy" data-shortname=":-ohmy" />). One other reason is that serial ports have current-limiting resistors built in, so slightly more protection than a parallel port offers.</p><p></p><p></p><p>laters,</p><p></p><p>-biff.</p></blockquote><p></p>
[QUOTE="bifferos, post: 164695, member: 196106"] Right-hand pic: This is the whole thing. There's a board glued to the top of an ATX PSU (don't ask - from another project:D). The relay board (top-right) was bought as a kit off ebay. Bottom-left goes to the PC serial port, bottom right to the dish. Left-hand pic: This is the bit that does the business. I didn't really need the LED, but thought it might be useful to see the pulses from the actuator. The big fat resistor at the back is to stabilise the PC power supply (ATX PSUs don't like being run not connected to a PC!). The bits you can't do without are the two opto-isolators, two diodes (betwen the two optos) and three resistors. You can make a very similar circuit to interface to the parallel port. I went for serial, because my PC has two serial ports and only one parallel (an extra chance in case I blew it up:o). One other reason is that serial ports have current-limiting resistors built in, so slightly more protection than a parallel port offers. laters, -biff. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Home made positioner
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