Summary of Voltmeter Ammeter Kit – Blue Backlight LCD
This Voltmeter Ammeter kit enables simultaneous voltage and current monitoring for power supplies and battery chargers. Utilizing a PIC16F876A microcontroller, it displays readings on a 16x2 LCD with resolutions of 100mV for voltage (0-70V or 0-500V) and up to 10A current. The project includes a double-sided PCB with a red solder mask and allows modifications to measure higher voltages by changing resistor R3 or higher currents by swapping the power resistor.
Parts used in the Voltmeter Ammeter Kit:
- 16 x 2 LCD Display with Blue Backlight
- PIC16F876A Programmed Microcontroller
- High Quality PCB with Red Solder Mask
- 28-DIP IC Socket
- 4MHz Resonator
- 16 x 1 Gold Plated Male Header
- 16 x 1 Gold Plated Female Header
- 4 x 1 Gold Plated Header
- LM7805 5V Voltage Regulator
- 10K Trimmer Potentiometer
- 4 x 10K Network Resistor
- 100K 1% Metal Film Resistors (2x)
- 6.8K 1% Metal Film Resistors (2x)
- 1K 1% Metal Film Resistor
- 10 Ohm 1% Metal Film Resistor
- 0.1 Ohm 5W Power Resistor
- 100nF Ceramic Capacitor
- 10uF Panasonic Capacitor
- Manual with Schematic
Voltmeter Ammeter is a great kit to measure voltage and current at the same time. It measures 0-70V or 0-500V voltage with 100mV resolution and current from 0 to 10A. It’s a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. Kit uses PIC16F876A microcontroller with built-in ADC (Analog to Digital Converter) to sample voltage with current and display it on 16 x 2 backlighted LCD display. It comes with all the parts required to build high quality kit, including double-sided PCB with beautiful red solder mask and plated through holes. With slight modification it is possible to measure higher voltage and current. To measure voltage that is higher than 70 Volts simply replace R3 6.8K resistor with included 1K resistor. This will allow to measure up to 500 Volts. 
To measure current that is higher than 10A simply replace 0.1 Ohm 5W power resistor with higher wattage resistor. For example 20W 0.1 Ohm resistor will allow to measure up to 20 Amps. Kit can also measure AC voltage if rectifier bridge is added to voltage input as well as measure and be supplied by the same power source.
Specifications
Voltage Supply: 6 – 30V
Current Consumption: 30mA
Voltage Input: 0 – 70V / 0 – 500V
Current Input: 0 – 10A
Component List
1x 16 x 2 LCD Display with Blue Backlight
1x PIC16F876A – Programmed microcontroller
1x High Quality PCB with red solder mask and plated through holes
1x 28-DIP IC Socket
1x 4MHz Resonator 
1x 16 x 1 Gold Plated Male Header
1x 16 x 1 Gold Plated Female Header
1x 4 x 1 Gold Plated Header
1x LM7805 5V Voltage Regulator
1x 10K Trimmer Potentiometer
1x 4 x 10K Network Resistor
2x 100K 1% Metal Film Resistor
2x 6.8K 1% Metal Film Resistor
1x 1K 1% Metal Film Resistor
1x 10 1% Metal Film Resistor
1x 0.1 Ohm 5W Power Resistor
1x 100nF Ceramic Capacitor
1x 10uF Panasonic Capacitor
1x Manual with Schematic
For more detail: Voltmeter Ammeter Kit – Blue Backlight LCD
-
What components are required to build this kit?
The kit includes a 16x2 LCD display, PIC16F876A microcontroller, PCB, headers, resistors, capacitors, a voltage regulator, and a manual. -
How can I modify the kit to measure up to 500 Volts?
Replace the R3 6.8K resistor with the included 1K resistor to allow measurement up to 500 Volts. -
Can this device measure AC voltage?
Yes, the kit can measure AC voltage if a rectifier bridge is added to the voltage input. -
How do I increase the current measurement limit beyond 10A?
Replace the 0.1 Ohm 5W power resistor with a higher wattage resistor, such as a 20W 0.1 Ohm resistor for up to 20 Amps. -
What is the voltage supply range for this project?
The voltage supply range is 6 to 30V. -
Does the kit support measuring voltage and current from the same source?
Yes, the kit can be supplied by and measure from the same power source. -
What resolution does the voltmeter provide?
The voltmeter provides a resolution of 100mV.
