Dual LCD Voltmeter Ammeter 0.100 VDC 0.10 A DC ATMEGA8

ATMEGA8 The presented device allows simultaneous measurement of two voltages and DC currents. The measurement results are presented in a clear way on the liquid crystal display. This project is recommended to developers of power supplies, chargers and other... Electronics Projects, Dual LCD Voltmeter Ammeter 0.100 VDC 0.10 A DC ATMEGA8 "atmega8 projects, avr project, microcontroller projects, " Date 2019/08/04

ATMEGA8 The presented device allows simultaneous measurement of two voltages and DC currents. The measurement results are presented in a clear way on the liquid crystal display. This project is recommended to developers of power supplies, chargers and other DC sources.

The design assumes the following assumptions: cheap and easy to get subassemblies, Measurement of voltage range: 0 … 10 VDC or 0 … 100 VDC, current measurement from 0 … 1 A or 0 … 10 A DC, change the scope without interfering with the program included in the microcontroller, measurements using a common reference point, no galvanic isolation between individual inputs; no need to calibrate, wide supply voltage range: 8 … 30 VDC, small size and uncomplicated way of mounting in the housing, eg power supply, Immediate work after turning on the power.

ATMEGA8 LCD Voltmeter Ammeter circuit schematic

The degree of system clock division (for proper ADC operation requires a frequency range of 50 … 200 kHz) workflow (continuous updating of Free Running Mode output or on-demand conversion, after setting the appropriate bit); way of signaling the completion of processing (emitting an interruption of program pause or setting of the corresponding flag in the register), data presentation method (the output register has a capacity of 2×8 bits and the stored data is 10 bits; they may occupy the oldest or youngest bits).

A 2×16 character alphanumeric display with an HD44780 compliant driver is included in the ATMEGA8 microcontroller. The measurement results are displayed or the selected range is exceeded. The P1 potentiometer adjusts the contrast of the display and the R13 resistor limits the current flowing through the backlight (if the display is backlit). The J8 connector is designed for US3 programming without having to remove it from the cradle.

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ATMEGA8 LCD Voltmeter Ammeter circuit schematic

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