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azmax100
02-05-2007, 02:50 PM
Hi all,

I already ordered an OEM BS2(parts number 27290). After reading the manual and circuit diagramĚthat i got fromĚ http://www.parallax.com/detail.asp?product_id=27290 I found that there's no reset button on the board.
I am going to use this module with my own project board.Anybody can help me how am i going to put a reset button on my project board?(Schematic Please)

And also I notice a 10mhz resonator on the board while my boe bot use 4mhz resonator. What's the different between this two?

On my project I will use some relay to replace some switch function without any current goes trough it.
Can I use a solid state relay instead of mechanical relay. What's the different between these two relay?
If i can use solid state relay how am i going to connect it with my BS2.

I hope somebody in this forum can help me with this and also if u can provide me the schematic it would be very much appreciated.

Thanks in advance.

latigerlilly
02-05-2007, 10:52 PM
For the reset button, just solder the two leads from your reset switch to rst and vss on your BS2. Here is the schematic: www.parallax.com/dl/docs/prod/boards/BOERevC.pdf (http://www.parallax.com/dl/docs/prod/boards/BOERevC.pdf) .

Solid state relays theoretically last forever and throws the switch instantaneously. Mechanical relays have a duty cycle where it may wear out at the end of the cycle (sometimes the cycle is 100K to 1million uses) and the mechanical relay is a bit slower (milliseconds instead of nanoseconds). This is theory only, though. In practice, a mechanical relay that is properly chosen for its task can last just as long as a solid state relay and the delay will not be noticeable if it is properly chosen. For example, you use a relay to turn on the lights. You will not notice that the lights turn on in a nanosecond or a millisecond. Furthermore, you'll never turn the lights on and off more than 1 million times in your lifetime, so in this instance, it doesn't matter which relay you choose.

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http://forums.parallax.com/showthread.php?p=630082