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#Specification PVIM-1

The PVIM  Precision Voltage IoT Monitor SDK Board board main features:

Top Level

  • Accurately Measure Voltages, from a Positive and Negative Range
  • Minimum of Eight Totally Separate Inputs ‚Äď Each Configurable
  • Low Noise
  • Good Dynamic Voltage Range
  • Self-Contained Board for IoT Projects
  • Wide DC Input Power Voltages. Board must be able to be Powered from around 12V to 48V Directly
  • High Voltage DC Power Supply 8-60V
  • On-Board 5V and 3V3 Voltage Regulators
  • Ability to Monitor Lead-Acid, Lithium Batteries. 48V Strings, or Individuals
  • Ability to Facilitate Current Monitoring via CT Clamps or DC Shunts
  • High Impedance Inputs
  • Ability to Measure Sensitive Voltages
  • Ability to Measure Temperatures (via Thermocouples)
  • Ability to Store Parameters and Log Measurements to EEPROM
  • Minimal Calibration Requirements
  • Compact but Flexible
  • Lower Current Usage
  • Controlled using an ESP32 MCU
  • Easy USB Connectivity Flashing, Logging etc

Board Level

  • Compact¬†and¬†Flexible Design¬†SDK Board
    • All connections are¬†low voltage, for¬†safe operation
    • Easy to interface
  • Espressif¬†ESP32¬†WROOM Options
    • ESP32-WROOM-32E-N4
      • Integral Antenna Wireless and Bluetooth
    • ESP32-WROOM-32UE-N4
      • Ext Antenna – U.FL Socket
      • Wireless and Bluetooth
  • AD76906
    • AD7606BSTZ 8 Channel DAS DSP
    • 8 x Simultaneously Sampled Isolated Input
    • Digital Multi-Meter
    • Synchronous Data Acquisition
    • 16-bit ADC with 200 kSPS on All channels
    • Oversampling Capability With Digital Filter
    • True Bipolar Analog Inputs +/- 5 V | +/- 10 V
    • Flexible Resistor Capacitor Networks on All Inputs
    • Individual Inputs Can Be Balanced (Differential) or Unbalanced (Grounded)
    • Second-order Antialiasing Analog Filter
    • 7 kV ESD Rating On All Analog Input Channels
    • 95.5 dB SNR, -107 dB THD
    • 0.5 LSB INL, 0.5 LSB DNL
    • Voltage Reference Internal (AD7606) or External (2.5V Reference On-board)
  • 24C64¬†EEPROM
    • Parameter Settings
    • Logging
  • OLED I2C
    • I2C Interface
    • OLED I2C Connector
      • Configurable Power Pins
  • DC Low Voltage Input
    • Power Supply DC input
      • 8 to 60 Volts
    • USB 5V (for development and logging)
    • Both can be connected at the same time
    • Onboard¬†3V3 DC LDO Power Supply
    • Onboard¬†5V DC SMPS¬†Power Supply
  • Arduino¬†Wemos D1 Compatible¬†USB Interface
    • On-board Micro USB Socket
    • Flashing and Programming
    • Example wemos_d1_mini32
    • Can also used to power the board
    • Debugging
  • On Board¬†NTC (PCB Ambient Temperature)
    • ESP32 GP39 VN
  • USER GPIO/UART
    • 2 GPIO for User (GP16 and GP17)
    • UART Interfacing (UART 2)
  • Reset Button
  • User¬†Programmable Button / Link
    • Connected to GP26
    • Can be solder jumper enabled
  • Configurable Solder Jumpers
    • 8 x Channel Input Grounds
    • Voltage Reference Internal/On-Board
    • AD7606 Standby Enable/Disable
    • User Button GP0/GP26
    • OLED / I2C Header
      • Configurable Pin 1 and 2
        • Pin 1 Ground or 3V3
        • Pin 2 Ground or 3V3
  • RGB Status LED
    • User Configurable via GPIO
      • R- GP2 | G- GP4 | B- GP15
  • Power LEDs
    • 3V3
    • 5V
    • USB 5V
    • DC Input 8-60V
  • Size 100 mm x 90 mm