Skip to content

DM101 MilliAmp

Measure and display current consumption in milliamps.

The input voltage can be up to 25V. The current consumption can go up to 80 mA, since the on-board 0.1 Ω resistor was replaced by 1.0 Ω to increase the IN226's sensitivity.

Usage

  1. Connect IO-2 to the target supply (can be a jumper to IO-1 for 3.3V).
  2. Connect IO-3 to the DUT's (device under test) power input, i.e. as Vcc.
  3. Optional: connect IO-4 to the DUT's ground if not grounded elsewhere.

Connections

Left I/O Right Bus
IO-1 3.3V BUS-A LIN
IO-2 Vin BUS-B N/C
IO-3 Vout BUS-C N/C
IO-4 GND BUS-D N/C
GND +3.3V +5V GND
√ N/C IN N/C

Board

Components

  • WeAct STM32C011F6 board see GitHub and AliExpress
    • on-board PC14 solder jumper needs to be closed (for use as SDA)
  • INA226 module (AliExpress) - 0.1 Ω sense resistor replaced by 1.0 Ω (80 mA range)
  • 88x48 OLED display (AliExpress) on I2C: PC14 = SDA, PB7 = SCL

Schematics

Software

TBD