Current consumption measuring is an important task when choosing the right power supply for a project. This tutorial demonstrates how to measure a current consumption of the XIAO SAMD21 development board.
Components
| No. | Component | Quantity |
|---|---|---|
| 1. | XIAO SAMD21 | 1 |
| 2. | Multimeter | 1 |
| 3. | Alligator clips | 2 |
| 4. | 5V wall power supply | 1 |
| 5. | DC barrel jack adapter | 1 |
| 6. | Jumper wires | 3 |
Circuit diagram
- The 5V pin of the XIAO SAMD21 board is connected to the plus (+) terminal of the DC barrel jack adapter.
- The GND pin of the XIAO SAMD21 board is connected to the input of a multimeter that measures current.
- The minus (-) terminal of the DC barrel jack adapter is connected to the COM probe of a multimeter.
Measuring
We uploaded code that contains empty setup and loop function.
Follow the following steps to measure a current consumption of the XIAO SAMD21 board:
- Plug the black probe into the COM port of the multimeter.
- Plug the red probe into the port with the
VΩmAsymbol. IMPORTANT: multimeters have a limit on how many amps can be measured. For example, XL830L multimeter has the port with theVΩmAsymbol. It can measure current up to 200mA. If current exceeds the maximum limit, the multimeter fuse melts. - Using an alligator clip, connect the black probe to the minus (-) terminal of the DC jack.
- Using an alligator clip, connect the red probe to the GND pin of the XIAO SAMD21 board.
- Connect the 5V pin of the XIAO SAMD21 board to the plus (+) terminal of the DC jack.
A current consumption of the XIAO SAMD21 board is about 12.8mA.
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