Hmm
Maybe a 1.8v zener ? Or 1N4007’s in series = 1.4V "No one could make a greater mistake than he who did nothing because he could do only a little." "All that is necessary for the triumph of evil is that good men do nothing" Edmond Burke (1729 - 1797) http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On Behalf Of Paul Hannah Sent: Tuesday, December 16, 2014 9:09 PM To: beagleboard@googlegroups.com Subject: [beagleboard] Sensing flowmeter / protecting analog input Hi, I'm looking to build a system to sense 'steps' of a hall-effect flowmeter. My first throught is to use a voltage divider and rectifier circuit to get down to the 0-1.8v I need. The problem I have is that every install may potentially have a different input voltage. I'm wondering if there's a simpler way to do this. I really only need to clip the voltage between 0-1.8v, it doesn't matter if it spends 90% of it's time clipped and throws away the negative half of the signal completely as I'm only interested in a count. The current draw will be in the millivolt-range used by the adc input, so it shouldn't need anything too heavy. My first thought is a simple voltage regulator set to 1.8v, but I don't know enough about them to know whether it's a viable option or which to choose. Any suggestions? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5577 / Virus Database: 4253/8748 - Release Date: 12/16/14 _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5577 / Virus Database: 4235/8735 - Release Date: 12/14/14 -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
