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CircleCI

Python UM-Meter interface

Support RDTech UM24C, UM25C, UM34C.

Library usage

Open an UM-Meter interface and request data:

from pyummeter import UMmeter, UMmeterInterfaceTTY

with UMmeter(UMmeterInterfaceTTY("/path/to/serial/port")) as meter:
    data = meter.get_data()
    print(f"{data['voltage']} V / {data['power']} W")

It is also possible to export the data to a CSV file:

from datetime import datetime
from pyummeter import UMmeter, UMmeterInterfaceTTY
from pyummeter.export_csv import ExportCSV

csv = ExportCSV("/path/to/csv")
with UMmeter(UMmeterInterfaceTTY("/path/to/serial/port")) as meter:
    csv.update(datetime.now(), meter.get_data())

List of data available:

  • model: UM-Meter model name (exported to CSV)
  • voltage: Voltage (V) (exported to CSV)
  • intensity: Intensity (A) (exported to CSV)
  • power: Power (W) (exported to CSV)
  • resistance: Resistance (Ohm) (exported to CSV)
  • usb_voltage_dp: USB Voltage D+ (V) (exported to CSV)
  • usb_voltage_dn: USB Voltage D- (V) (exported to CSV)
  • charging_mode: Charging mode short name (exported to CSV)
  • charging_mode_full: Charging mode full name
  • temperature_celsius: Temperature (°C) (exported to CSV)
  • temperature_fahrenheit: Temperature (°F)
  • data_group_selected: Selected data group (index)
  • data_group: Data for each data group (list) (exported to CSV, only the selected group)
    • capacity: Capacity (Ah)
    • energy: Energy (Wh)
  • record_capacity_threshold: [Record mode] Capacity threshold (Ah) (exported to CSV)
  • record_energy_threshold: [Record mode] Energy threshold (Wh) (exported to CSV)
  • record_intensity_threshold: [Record mode] Intensity threshold (A) (exported to CSV)
  • record_duration: [Record mode] Duration (seconds) (exported to CSV)
  • record_enabled: [Record mode] Enable status (exported to CSV)
  • screen_index: Screen index
  • screen_timeout: Screen timeout
  • screen_brightness: Screen brightness
  • checksum: Checksum of all data

Meter control managed (not available on all model):

  • Screen control:
    • Change (next/previous)
    • Rotate
    • Set timeout (0 to 9 minutes)
    • Set brightness (0 to 5)
  • Data group control:
    • Select (0 to 9, next)
    • Clear
  • Record threshold (0 to 300 mA)

Running example

Bluetooth initialisation

$ sudo killall rfcomm
$ rfkill block bluetooth
$ rfkill unblock bluetooth
$ sudo bluetoothctl
[bluetooth] power on
[bluetooth] agent on
[bluetooth] scan on
[bluetooth] pair <MAC>
$ sudo rfcomm connect /dev/rfcomm0 <MAC>

Demo application usage

poetry install
poetry run task demo -t /dev/rfcomm0