Dew Heater Device

For most OnStep telescope mount controllers (visit my group for more information.)

**Note: For non-commercial use only (see License terms, CC-BY-NC-SA 3.0)**

This design provides three or four 12V dew heater outputs controlled by a 1-Wire interface input on a 3.5mm stereo mini jack.  It also allows adding DS18B20 point temperature sensors for precision dew heater temperature regulation on two 1-Wire outputs using the same 3.6mm stereo mini jack.  Three of the four dew heater outputs use industry standard 1/4" RCA jacks.  The fourth control channel is on a 5.08mm three pin pluggable screw terminal jack and for flexibility can operate at either 12V or 5VDC for signaling or control applications such as opening and closing an optical tube assembly cover.  Power is also brought in on a 5.08mm two pin pluggable screw terminal jack.

The case this is designed for is here:

https://www.ebay.com/itm/Aluminum-Enclosure-Electronic-DIY-PCB-Instrument-Project-Box-Case-100x71x26mm/331174761867?hash=item4d1b8dd58b:rk:2:pf:0

A set of 3D printable panels for the above case is here:

https://onstep.groups.io/g/main/files/3D-printables/Dew%20Heater%20Device%20Panels

Revision History:

v1.0 First release.