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SENSOR OPTIONS
CHOOSE TO USE EITHER THE WIRED OPTICAL SENSOR OR THE PCB-BASED SENSOR
WIRED OPTICAL SENSOR:
Tap was designed to use one of the following sensors from Optek:
OPB991P51Z
OPB991T51Z
OPB991L51Z
OPB991T11Z (or OPB991L11Z)
Pre-release versions of Tap used OPB990 sensors. We switched to 991 because some MCU’s were shown to be sensitive to having +5v on a signal pin.
These sensors are pre-wired, but you will have to add a 220 Ohm resistor to the wiring as a current limiter. The exact resistance is not critical, it can be +/- 10% of 220 Ohms, and should be rated for ¼
watt or higher. Soldering this resistor is no harder than adding the diode for the old inductive sensors…but soldering isn't for everyone. See next page for details on soldering this together.
PCB-BASED SENSOR:
Recognizing that soldering is difcult for some builders, Voron engineers designed a PCB-based sensor. This mounts an Optek OPB666N or OPB971N sensor. This PCB has the advantage of having
an indicator light on the board. The les for making this may be found on the Voron Github. https://github.com/VoronDesign/Voron-Tap/tree/main/OptoTap
WHICH ONE IS BETTER?
They are both capable of 0.4 µm accuracy (assuming the rest of the printer is in good condition). If you can, get the PCB-based sensor. Having an indicator light is a big plus, and the OPB666N sensor is
good to 100° Celsius operating temperature. The OPB991 and OPB971 sensors are rated to 70° Celsius which should be ne for most Voron printers. The sensor is away from signicant sources of heat.
IF YOU PURCHASE A PREBUILT PCB-BASED SENSOR
Make sure it’s based on either an Optek 971N51 or OPB666N sensor, and its designed to work with Tap. Don’t buy a generic sensor and expect it to work, this is not the place to save a couple of
bucks.
DO NOT CONNECT SENSOR TO 24V
These circuits were designed for 5 volts, 24 volts is more than 5 volts.
Connecting to 24 volts may appear to work at rst, but the sensor will
burn out.
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