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Green rectangular circuit board with 40-pin header and four measurement channels

WaveShare

WaveShare 4-CH Current/Voltage/Power Monitor HAT measurement tool

SKU CH-1TNV-CA2CP

Four-channel HAT monitors current, voltage and power on Raspberry Pi boards via I2C, measuring bi-directional current up to 3.2A with a 12-bit ADC and 0.1Ω sampling resistor

  • CPU TypeOther
  • Four channels monitored simultaneously via standard 40-pin GPIO header
  • Bi-directional current up to 3.2A measured with onboard 0.1 Ω sampling resistor
  • 12-bit ADC delivers 0.8mA resolution at full range or 0.1mA at ±400mA
  • Voltage measured from 0 to 26V with power calculated in hardware multiply register
  • Compact 65mm × 30mm HAT operates at 3.3V or 5V over I2C/SMBus

Four-channel power monitor HAT

This 4-CH current and voltage monitor HAT is designed for Raspberry Pi boards. It connects through the standard 40-pin GPIO header and communicates via an I2C or SMBus interface. The board measures bi-directional current on four independent channels simultaneously. It suits engineers and hobbyists who need detailed power analysis for their Pi projects.

Onboard 0.1 ohm sampling and 12-bit ADC

Build quality centres on a precision 0.1 ohm 1% sampling resistor and an embedded 12-bit ADC. The ADC supports multiple successive conversions for stable readings. The HAT operates at either 3.3V or 5V logic levels. Four mounting holes of 3.0mm diameter secure the 65mm by 30mm board firmly to the Raspberry Pi.

Upgrades single-channel or software-based monitoring

This HAT replaces single-channel monitors or software-only estimation by delivering simultaneous four-channel data. Hardware-based measurement removes CPU overhead and improves accuracy over calculated values. The jump is worth it when a project must track voltage from 0 to 26V and current up to ±3.2A across multiple rails at once. It is not for users who only need a single aggregate power reading.

Highlights

  • Four channels monitored simultaneously via standard 40-pin GPIO header
  • Bi-directional current up to 3.2A measured with onboard 0.1 Ω sampling resistor
  • 12-bit ADC delivers 0.8mA resolution at full range or 0.1mA at ±400mA
  • Voltage measured from 0 to 26V with power calculated in hardware multiply register
  • Compact 65mm × 30mm HAT operates at 3.3V or 5V over I2C/SMBus

Specifications

CPU TypeOther

Questions about this item

What does the I2C/SMBus interface cap in practice for this HAT?

The I2C/SMBus interface controls the onboard 12-bit ADC, enabling 4-channel monitoring with bi-directional current measurement up to ±3.2 A and voltage measurement from 0 to 26 V.

What physical space and mounting does this HAT need on a Raspberry Pi?

It uses the standard 40-pin GPIO header, measures 65 mm × 30 mm, and has 3.0 mm mounting holes for secure attachment.

How is the HAT installed, and what step do people often get wrong?

Align the 40-pin header and press firmly onto the Pi's GPIO pins; the step often missed is ensuring the I2C interface is enabled in the Pi's configuration before running measurement software.

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