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computemodul4_temperature_test [2021/05/03 00:50] wf68spef |
computemodul4_temperature_test [2021/05/17 01:00] (current) wf68spef [Test 3 - Wifi] |
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| * PI4 Internal CPU Thermometer | * PI4 Internal CPU Thermometer | ||
| * Multimeter: AM-550-EU PTC Temperature for Wifi Temperature Measurements | * Multimeter: AM-550-EU PTC Temperature for Wifi Temperature Measurements | ||
| + | * The temperature of the wifi module by placing the ptc at the heatsink of the wifi module | ||
| + | * Not highly accurate, but should give a indication | ||
| + | Lab Power source | ||
| + | * Quatpower LN-3003 | ||
| ====== Software ====== | ====== Software ====== | ||
| - | ==== Reduced power usage by disabling various CM4 modules ==== | + | ==== Reduce power usage of CM4 ==== |
| **no bluetooth** | **no bluetooth** | ||
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| * config.txt | * config.txt | ||
| * dtparam=audio=off | * dtparam=audio=off | ||
| + | |||
| + | **no USB** | ||
| + | * disabled by default @ CM4 for powersaving | ||
| + | * https://www.jeffgeerling.com/blog/2020/usb-20-ports-not-working-on-compute-module-4-check-your-overlays | ||
| ==== Testsoftware ==== | ==== Testsoftware ==== | ||
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| ^ Testmode ^ Time (h) ^ Power usage (Wh) ^ Power usage (W) ^ CPU Temp (°C) ^ WIFI Temp (°C) ^ | ^ Testmode ^ Time (h) ^ Power usage (Wh) ^ Power usage (W) ^ CPU Temp (°C) ^ WIFI Temp (°C) ^ | ||
| | IDLE | 0:00 | - | 1.7 | 43.8 | 30 | | | IDLE | 0:00 | - | 1.7 | 43.8 | 30 | | ||
| - | | use 2 cameras | 0:00 | - | 2.4 | 43.8 | 30 | | + | | use 2 cameras | 0:00 | - | 2.4 | 43.8 | 30 | |
| - | | WIFI | 0:00 | - | 2.65 | 43.8 | 30 | | + | | WIFI | 0:00 | - | 2.65 | 43.8 | 30 | |
| | use 2 cameras + WIFI | 0:00 | 4.83 | 3.2 | 43.8 | 30 | | | use 2 cameras + WIFI | 0:00 | 4.83 | 3.2 | 43.8 | 30 | | ||
| | use 2 cameras + WIFI | 0:15 | 5.666 | 3.2 | 52.0 | 48 | | | use 2 cameras + WIFI | 0:15 | 5.666 | 3.2 | 52.0 | 48 | | ||
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| Using the power usage in Wh a **mean power of ~3.38W** is needed when using 2 cameras + wifibroadcast. | Using the power usage in Wh a **mean power of ~3.38W** is needed when using 2 cameras + wifibroadcast. | ||
| + | |||
| + | ==== Test 3 - Wifi ==== | ||
| + | |||
| + | As it turned out that the radio power amplifier was not connected in test #2, i reran the test. Power is provided by the laboratory power source @ 12.3V + DCDC Converter @ 5V for the cm4 board. | ||
| + | |||
| + | **NOTE:** The sligtly incread Idle power usage is due to the additional DCDC converter, and the powermeasurement BEFORE this converter. | ||
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| + | ^ Testmode ^ Time (h) ^ Power usage (W) ^ CPU Temp (°C) ^ WIFI Temp (°C) ^ | ||
| + | | IDLE | 0:00 | 2.3 | 34.5 | 27 | | ||
| + | | WIFI | 0:01 | 5.78 | 36.5 | 29 | | ||
| + | | WIFI | 0:11 | 5.78 | 46.7 | 58 | | ||
| + | | WIFI | 0:21 | 5.78 | 51.0 | 62 | | ||
| + | | WIFI | 0:30 | 5.78 | 51.0 | 63 | | ||
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