Tutorial: Measuring power consumption

Matt Bartos edited this page Aug 22, 2017 · 1 revision

How to take a Power Reading

Equipment Needed:

  • Board
  • TiePie
  • Charge Controller (not necessary)
  • Battery
  • 1 Ohm Resistor
  • Computer with TiePie Software

Schematic:

With Charge Controller:

(will add later)

Without Charge Controller:

(will add later)

Note: The positive end of the TiePie is the "hook", while the negative end is the alligator clip

Steps:

1: Connect the board as normal, but leave the negative load wire from the charge controller disconnected from the negative power terminal on the board.

2: Connect a 1-ohm resistor between the negative power terminal and the negative load wire.

3: Across the 1-ohm resistor, place the positive and negative TiePie probes. The positive probe looks like a hook and should be between the negative load line and the resistor. The negative probe is an alligator clip and should be between the other end of the resistor and the negative power terminal.

4: Load the TiePie Multi Channel program on your computer and connect the probe to a USB port on the computer

5: After programming the board, you should receive voltage readings on the graph on the computer. Since you are using a 1-ohm resistor, the current through it (in Amperes) and the voltage across it (in Volts) are the same, and since the resistor and the board are in series, the current through the resistor and the current through the board are also the same.

6: Calculate power using P = I*V, using the battery voltage as V and the current from step 5 as I.

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