Digital DC voltmeter 0-99.9 V with programmable over and under voltage alarm

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YH11066B is a compact digital DC voltmeter with a clear green LED display for measuring DC voltage up to 99.9 V. The module displays voltage with a resolution of 0.1 V and is suitable for monitoring batteries, power supplies and other electronic equipment.

The module has programmable limits for both overvoltage and undervoltage. HV is used to set the upper voltage limit and LV is used to set the lower voltage limit. When the measured voltage passes a programmed limit, the corresponding control signal changes state and can be used together with an external transistor, MOSFET, relay driver or other control circuit.

Settings are made using the module buttons and no external potentiometer is required. P1 is used for setting the alarm limits. P2 sets the recovery voltage after an undervoltage alarm. P3 selects automatic or manual recovery. P5 can be used to invert the output logic. P7 is used for voltage calibration against an accurate multimeter.

The module uses the Nuvoton N76E003AT20 microcontroller. It also has connections for external buttons S1 and S2 and the control outputs OUT, HV and LV.

R1 is open on this version of the module. With separate power supply, the module can be used to measure voltages higher than the module supply voltage. The module supply voltage is 4-30 V DC.

The module is suitable for DIY power supplies, voltage monitoring, overvoltage and undervoltage alarms and battery protection against deep discharge. HV, LV and OUT are control signals and should not be used directly to drive larger loads. When controlling a relay, for example, an external transistor or MOSFET should be used.

Facts.
Measuring range: 0-99.9 V DC
Power supply voltage: 4-30 V DC
Resolution: 0.1 V
Display: 3 digit green LED
Upper limit setting: 0.1-99.9 V
Lower limit setting: 0.1-99.9 V
Refresh rate: approximately 300 ms
Measurement type: DC voltage
CPU: Nuvoton N76E003AT20
Settings: P1-P7
Calibration: Via P7
Recovery: Automatic or manual via P3
Logic inversion: Via P5
External button 1: S1
External button 2: S2
Control output: OUT
Overvoltage output: HV
Undervoltage output: LV
R1: Open on this version
Reverse polarity protection: Yes
Operating temperature: -40 to +85 degrees C
Mounting: 2 x 2 mm screws
Size: 29 x 23 x 10 mm
Application: DIY power supply
Application: Voltage monitoring
Application: Overvoltage alarm
Application: Undervoltage alarm
Application: Overvoltage protection
Application: Undervoltage protection
Application: Battery over discharge protection

Included.
1 pc module.

About the product.
Weight: approx 10 gram.
Contact us if you have questions at info@pchbutik.se
Article no: 3780
Remaining stock quantity can be found under the Product details tab.
In our range since: 2026-08-24

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