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--- computemodul4_temperature_test [2021/05/03 00:41]
wf68spef
+++ computemodul4_temperature_test [2021/05/17 01:00] (current)
wf68spef [Test 3 - Wifi]
@@ Line 3: / Line 3: @@
 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
+       * With Heatsink (https://www.pollin.de/p/joy-it-kuehlkoerperset-fuer-raspberry-pi-810822)
 Board:
   * Wavesahre CM4-IO-BASE-B https://www.waveshare.com/wiki/CM4-IO-BASE-B
@@ Line 15: / Line 16: @@
   * PI4 Internal CPU Thermometer
   * 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 ======
-==== Reduced power usage by disabling various CM4 modules ====
+==== Reduce power usage of CM4 ====
 **no bluetooth**
@@ Line 48: / Line 53: @@
   * config.txt
   * 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 ====
@@ Line 93: / Line 102: @@
 ====== Tests ======
-**Test 1 - 2 cameras**
+==== Test 1 - 2 cameras ====
 {{ ::IMG_20210502_160159.jpg?400 |}}
@@ Line 106: / Line 116: @@
 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 |}}
@@ Line 112: / Line 122: @@
 ^ Testmode      ^ Time (h) ^ Power usage (Wh)  ^ Power usage (W) ^ CPU Temp (°C) ^ WIFI Temp (°C) ^
 | 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 |  0:15    |   5.666       |   3.2           |  52.0           |   48           |
 | 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           |