VMS Stands for Voltage Measurement System. This shield is designed to allow measurement of voltages up to 14.5Vdv on channel 0-3.

I designed this shield for use with projects that require the accurate measurement of battery voltages up to 14.5vdc, such as robotics or other projects involving powerful motors.

It is Based on the MCP3208 ADC controller IC.

MCP3208

• 8 analog input channels 100 ksps max. sampling rate at VDD = 5V
• 12-Bits of resolution (when powered with 5V.)
• Max analog input voltage = 5.2v
• Analog inputs programmable as single-ended or pseudo-differential pairs
• On-chip sample and hold SPI serial interface (modes 0,0 and 1,1)
• Low power CMOS technology 500 nA typical standby current, 2 µA max. 400 µA max. active current at 5V Industrial temp range: -40°C to +85°C

Board Features:

• 4-channels configured with a voltage divider to allow measuring voltage up to 14.5VDC.
• Voltage dividers can be disabled via solder jumpers
• 4-channels configured for direct-input for ADC measurements up to 5Vdc
• All channels can be used in single-ended or differential mode, allowing for measurements of +/-5Vdc (+/-14.5Vdc on channels 0-3 with voltage-dividers in-line)
• Power LED
• 5V and GND connection terminals.
• Input filtering for ADC stability
• Board can back-power Arduino via 5V and GND connection terminals.
• High-quality screw-terminals on all channels (COLOR MAY VARY)
• SPI CS selectable via jumpers (D7 - D10)
• Stackable headers
• Can stack up to 4 ADC shields by selecting different SPI CS pins.

This shield ships fully-assembled.

You can find example Arduino sketches and design files on my Github site, linked in the documentation section.

You can find an easy-to-use library for the MCP3208 on Arduino HERE