On 4 December 2010 00:46, Kirk Wallace <kwall...@wallacecompany.com> wrote: > > I'm working on using an ATtiny to watch EMC2's charge pump.
Why not use a charge pump circuit to watch the charge pump signal? That is what it was designed for, and is probably the most fail-safe solution. The timeout period is set by the capacitors and resistors you choose, and can't get accidentally changed or disabled. A charge pump circuit consists of two diodes, one small capacitor (a few hundred pF or a few nF), one medium capacitor (a few tens of nF), and a resistor. Also needed is something to look at its output and turn off the dangerous stuff if the output drops too low. That can be as simple as a transistor driving a relay coil, or you could use a schmidt trigger input logic gate followed by whatever you need to drive. No microcontroller, no programming, no configuration, no bits. Analog lives! John Kasunich -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ This SF Dev2Dev email is sponsored by: WikiLeaks The End of the Free Internet http://p.sf.net/sfu/therealnews-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
