Recent content by TimCole

Thanks, Eric. That's a clever circuit. One final question (or two interrelated ones): what's the range of resistances you'd expect for your moisture sensors, and what's your nominal time constant? I ask because I'm hoping to put together a telescope dew sensor based on the moisture meter. The...

Hi Eric, Yep, I'm back again. I've been poring over the Moisture Meter schematic and the DS2760 data sheet. It looks to me as if the 555/sensor circuit is treated as an external sense resistor for the DS2760. If that's the case, then I'd read the Current Register for the moisture measurement...

That's what I thought, but I wanted to make sure I wasn't missing a point. It's great to be able to ask what the designer had in mind. Thanks for the quick answer. Cheers, Tim Cole Ottawa ON

Greetings Eric, If I've got the current schematic for the Humidity/Temp/Solar board, it looks as if the Vdd pin on the DS18S20 is tied to ground. But tying the Vdd pin to the +5 line on board would eliminate the need for a strong pullup cycle while sensing the temperature. Is there any reason...

Greetings all, I need to wire a DB-9 connector so I can provide power to the serial-to-1wire adapter. The documentation states that the DS9097U uses RTS and DTR as power pins, but I'm getting myself twisted up on what pin numbers are used on the adapter's DB-9F connector. Is the DS9097U wired...

Greetings all, I'm just starting to fiddle with 1-wire sensors, and I'm planning on using a Rabbit Semiconductor processor to run it all. I'll be writing some of the software, and I prefer to know how to go about interrogating the various devices. Even if I can count on just using pre-canned...