Voltmeter Suite DIY Kits Electronic Suite Electronic DIY

Description
1.
Package Name: voltmeter Kit
2.
Kit Model: VOT-8
3.
Operating voltage: 3.5 ~ 25V
4. PCB size: 33 * 52mm
5.
Measuring range: 0 ~ 30V
6.
Measurement accuracy: 0.1V
7. The VOT-8 voltmeter package key switch control can work in two-wire or three-wire system state. (Shipping terminal configured as a two-wire)
8. The two-wire (by measuring voltage of the the VOT-8 power supply), the measurement range of 3.5 to 25.
9. The three-wire (by the external power supply voltage of 3.5 ~ 25V the VOT-8 power supply), the measurement range to 0 to 30V.

Production steps
1. Welding resistance;
2. Welding capacitors, diodes, potentiometers;
3. Welding of the key switch, Attention to the direction
4. Welding IC socket
5. Installing digital tube
6. Installation of single-chip and copper pillar (Note microcontroller direction)
7. Produced clip cord
8.
Calibration voltage table:
Multimeter voltage profile, or a known voltage source voltage adjustment the VR1 potentiometer calibration.

Features
Suite Name: Voltmeter Suite Type: VOT-8
Operating Voltage: 3.5 ~25V
Measuring Range: 0~30V Measuring Accuracy: 0.1V

The VOT-8 voltmeter suite is controlled by key-switch and can work well under the condition of two-wire or three-wire system.
For the two-wire system, VOT-8 will be supplied with power by the measured voltage. And the measuring range is 3.5 ~25V.
For the three-wire system, VOT-8 will be supplied with power by a set of voltage with the range of 3.5 ~25V. And the measuring range is 0~30V.

Principle of Operating
The measured voltage is inputted via J1 PIN3. And it's inputted to the SCM PIN23 after the pressure resistance through R1, VR1 and R2. The analog voltage will be transferred to digital signal through the A/D converter inside of the SCM. At last, the measured voltage will be displayed on the digital tube after scanning the digital tube.
The system power is connected reversely through S1 polarity. And the IC of diode (from D1 to U2) outputs voltage 3.3 V.

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Principle of Circuits

List of Components