DM101 MilliAmp¶
Measure and display current consumption in milliamps.
The input voltage limit is 25V. The current consumption can go up to 80 mA, since the on-board 0.1 Ω resistor was replaced with 1.0 Ω to increase the INA226's current sensitivity.
Usage¶
- Connect IO-2 to the target supply (can be a jumper to IO-1 for 3.3V).
- Connect IO-3 to the DUT's (device under test) power input, i.e. as Vcc.
- 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¶
This module was manually constructed using a 7x3 cm proto 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 with 1.0 Ω (80 mA range)
- 88x48 OLED display (AliExpress) on I2C: PC14 = SDA, PB7 = SCL
Schematics¶
- WeAct STM32C011F6: see GitHub
- INA226: see AliExpress
Software¶
See https://codeberg.org/jcw/dobb/src/branch/main/mods/dm10x/ina226.cpp.