computemodul4_temperature_test

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computemodul4_temperature_test [2021/05/03 00:41] – created wf68spefcomputemodul4_temperature_test [2021/05/17 01:00] (current) – [Test 3 - Wifi] wf68spef
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 PI Compute Board: PI Compute Board:
   * RPI-CM4Lite-R1-3: https://www.berrybase.de/raspberry-pi/raspberry-pi-computer/compute-modules/raspberry-pi-compute-module-4-4gb-ram-lite-wlan-43-bt   * RPI-CM4Lite-R1-3: https://www.berrybase.de/raspberry-pi/raspberry-pi-computer/compute-modules/raspberry-pi-compute-module-4-4gb-ram-lite-wlan-43-bt
 +       * With Heatsink (https://www.pollin.de/p/joy-it-kuehlkoerperset-fuer-raspberry-pi-810822)
 Board:  Board: 
   * Wavesahre CM4-IO-BASE-B https://www.waveshare.com/wiki/CM4-IO-BASE-B   * Wavesahre CM4-IO-BASE-B https://www.waveshare.com/wiki/CM4-IO-BASE-B
Line 15: Line 16:
   * 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 ==== 
Line 93: Line 102:
 ====== Tests ====== ====== Tests ======
  
 +==== Test 1 - 2 cameras ====
  
-**Test 1 - 2 cameras** 
  
 {{ ::IMG_20210502_160159.jpg?400 |}} {{ ::IMG_20210502_160159.jpg?400 |}}
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 Using the power usage in Wh a **mean power of ~1.8W** is needed when using 2 cameras. Using the power usage in Wh a **mean power of ~1.8W** is needed when using 2 cameras.
  
-**Test 2 - 2 cameras + Wifi**+==== Test 2 - 2 cameras + Wifi ====  
 + 
 +{{ ::IMG_20210503_000548.jpg?400 |}}
  
 ^ 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           | 
 | use 2 cameras + WIFI |  0:30    |   6.52       |   3.2           |  53.0           |   50           |  | use 2 cameras + WIFI |  0:30    |   6.52       |   3.2           |  53.0           |   50           | 
  
-Using the power usage in Wh a **mean power of ~3.38W** is needed when using 2 cameras + wifi.+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. 
 + 
 +^ 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           |  
 + 
 + 
 + 
  
-{{ ::IMG_20210503_000548.jpg?400 |}} 
  • computemodul4_temperature_test.1619995295.txt.gz
  • Last modified: 2021/05/03 00:41
  • by wf68spef