INA229 FT232H

A small Python driver for the Texas Instruments INA229 SPI power/energy/charge monitor, including an FT232H helper for Adafruit Blinka and pyftdi.

Installation

Install the released package from PyPI:

python -m pip install ina229-ft232h

For local development, clone the repository and install it in editable mode:

python -m pip install -e .

Set BLINKA_FT232H=1 before starting Python whenever the FT232H helper is used.

FT232H wiring

FT232H INA229
D0 (SCK) SCLK
D1 (MOSI) SDI
D2 (MISO) SDO
D3 /CS
GND GND

The FT232H uses 3.3 V logic. Keep the SPI harness short and provide a solid ground return. For longer harnesses, reduce the baud rate and consider source series termination on SCK, MOSI, and /CS.

Basic usage

import ina229_ft232h as ina229

spi = ina229.ft232h_spi(baudrate=1_000_000)
device = ina229.INA229(
    spi,
    shunt_ohms=0.01,
    max_current=8.0,
)

print(device.bus_voltage)
print(device.shunt_voltage)
print(device.current)
print(device.power)
print(device.energy)
print(device.charge)
print(device.temperature)

max_current defines the signed CURRENT-register full scale and therefore the current LSB. Choose it above the largest expected transient. The shunt drop must also remain within the selected ADC range:

  • adc_range=False: +/-163.84 mV
  • adc_range=True: +/-40.96 mV, four times finer resolution

ADC configuration

device.configure_adc(
    mode=ina229.MODE_CONT_ALL,
    vbus_ct=ina229.CT_50US,
    vshunt_ct=ina229.CT_50US,
    temp_ct=ina229.CT_50US,
    avg=ina229.AVG_1,
)

The module exports the INA229 register addresses and MODE_*, CT_*, and AVG_* field constants for lower-level use.

SPI mode note

The INA229 requires falling-edge sampling. Blinka's FT232H backend rejects CPHA=1, while pyftdi's mode-1 three-phase emulation shifted received INA229 words by one bit on the tested hardware. ft232h_spi() therefore defaults the underlying pyftdi port to mode 2, which provides the working edge timing without three-phase emulation. Override it with ft232h_spi(mode=...) if another adapter requires different timing.

Tests

python -m unittest discover -v

Release maintainers can find the trusted-publishing setup and release process in RELEASING.md.

Project links

Data verified by PyPI on Aug 29, 2026
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Credits

Author: Sibo Van Gool

GitHub Statistics

Data verified by PyPI on Aug 29, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.10

Provides Extra

test

Tags

current-monitor ft232h ina229 power-monitor spi

Classifiers

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