one-wire stuff

both of these are pretty small, 2 layer boards.

simple-one-wire-adapter

i've got a lot of ethernet patch cables laying around. i like to use them for carrying 1-wire. sometimes i take a little 8P8C plug, and crimp a DS18B20 into it. that's an absolute pain in the ass, let me tell you.

so i made this little board, it's got a spot at either end for a 54601-908WPLF 8P8C jack. it's an unshielded, no magnetics, no LEDs jack. then in the middle there's two TO-92 footprints for DS18B20. also every pin is labeled on the silkscreen (i haven't tested all of that in production, so be careful your first time and please report any errors), so you can easily just solder wires instead of connectors or sensors.

the 54601-908WPLF is obsolete (i had a huge pile of them for reasons), the A-2004-2-4-LP-N-R might also work, or not. please report back with any findings.

1820-passthrough

this is a round PCB with a TO-92 DS18B20 footprint in the center. the reverse side has two sets of fairly generic surface mount pads for VDD/DQ/GND.

the idea is that you've got an air duct you want a temperature sensor in. you take a step drill bit and put a hole into the duct. then you take one of these little (populated) PCBs, and stick the temperature sensor up into the duct. (i suggest insulating the leads of the package.) you can then tape the PCB onto the exterior of the duct, or caulk it into place. whatever you like. now you've got a temperature sensor in the air stream.

as an example, my HVAC system, like yours, has a return and supply duct. they're right next to each other. so i made two of these, soldered them together, soldered one of them to one of the simple-one-wire-adapter boards, poked the sensors through holes i drilled in the duct, and then bam. now i've got a DS18B20 monitoring my supply and return air temperatures right at the system.