Week 10 Assignment: Power Consumption Analysis of Display Output Device
Task Overview
This documentation details power consumption measurement of a 0.85" round LCD display (GC9107 controller) connected to XIAO ESP32S3 microcontroller, following Week 10 Course Requirements.
Test Equipment
Emkia LPU-2050 Linear Power Analyzer
Key Specifications:
| Parameter | Specification |
|---|---|
| Voltage Range | 0-12V DC |
| Current Range | 0-2A |
| Sampling Rate | 100KS/s |
| Measurement Accuracy | ±0.5% + 2mV |
| Waveform Analysis | True RMS & Transient Capture |
| Interface | USB-C + Bluetooth 5.0 |
Experimental Setup
1. Hardware Configuration
VBAT + -
Power Connection Diagram:
| XIAO ESP32S3 | Emkia Analyzer |
|---|---|
| BAT+ (3.7V) | Red Terminal |
| BAT- (GND) | Black Terminal |
| Display VCC | N/A (Separate Channel) |
Key Modifications:
- Desoldered battery connector from XIAO development board
- Installed 2.54mm pitch header for power rail access
- Created custom test jig with current shunt resistors
Measurement Protocol
1. Baseline Measurement (No Display)
measurement no display
Power Profile:
| Parameter | Value |
|---|---|
| Avg Voltage | 3.70V |
| Avg Current | 54.71mA |
| Power Consumption | 206.0mW |
2. Display On Measurement
measurement display on
Power Characteristics:
| Parameter | Value |
|---|---|
| Avg Voltage | 3.70V |
| Avg Current | 85.0mA |
| Power Consumption | 304.0mW |
Conclusion
The display's power consumption about 304.0mW, which is 30% higher than the baseline. This indicates that the display is consuming significant power. The display's power consumption is not negligible, but it is still within the expected range.