4 Channel Isolated ADC

$ 60.00$ 64.00

4 galvanically isolated voltage inputs allows measurement of any voltage you want. 0-5V input range and 16-bits at 15 Samples Per Second is ideal for low voltage high precision acquisition. Includes a Programmable Gain Amplifier (PGA) for measuring even lower voltage signals.

Ideal for measuring a series stack of lithium-ion cells in a battery, or for removing the possibility of ground loops when measuring different sources. Up to 32 devices can be daisy-chained with RS485 communication layer for up to 128 analog inputs.

Description

Specifications

The full spec sheet including a programming command manual and description of the hardware, firmware, and schematic are available here (link).

Channels 4
Voltage Input Range 0-5V, 0-2.5V, 0-1.25V, 0-0.625V (depending on gain, default 0-5V)
Voltage Input Connector 3.81mm pitch 2-pin pluggable terminal block
ADC Bits 16, 14, 12 (configurable with sample rate, default 16)
ADC Sample Rate 15, 60, 240 Samples Per Second (configurable, default 15)
ADC Gain 1, 2, 4, 8 (configurable, default 1)
ADC Least-Significant-Bit Size 176uV, 88uV, 44uV, 22uV (depending on gain, default 176uV)
Power – Input Voltage 5V
Power – Input Source 3.81mm pitch 2-pin pluggable terminal block OR USB-C (not both at the same time)
Power – Input Current 250mA
Communication Interface SCPI (through USB), RS485
RS485 Connector 3.81mm pitch 2-pin pluggable terminal block

Up to 32 boards connected to a single USB interface

Included Parts

  • 4CH Isolated ADC PCB
  • 7x 3.81mm pitch 2-pin pluggable terminal block for RS485, channel inputs, and optional power input
  • USB-A to USB-C cable
  • Files for 3D Printed case are available on Printables here (link).

Communication

SCPI interface is available on the USB port. This device can interface with Python through PyVisa. I have created a python library for this device as well as a GUI for calibrating it automatically using another programmable multimeter and power supply.

RS485 communication interface is available (though not currently supported in the firmware). It can be used to chain up to 32 boards together with a single USB interface, allowing a total of 128 isolated voltage measurements. The first board gets powered by USB, and subsequent boards get powered by the external 5V supply. The GND of all the boards (including the one powered by USB) must be connected as the RS485 interface is not isolated.

Firmware is available on Github. You are free to modify firmware and upload your own. The simplest way is to upload over the USB interface using the Arduino IDE, but for more advanced users there are serial header pins and a BOOT0 jumper available.

Additional information

Case Included

Yes, No