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