===== What is it? =====
A power meter. My summary so far: my goal is to measure power consumption of my Thinkpad, and be able to read the consumption details from Linux. Right now, I can only supply the Thinkpad with 5V@2A when the CT-3 is used, while the Thinkpad would also support 20V@3A. ([[https://forum.avhzy.com/forum.php?mod=viewthread&tid=212&extra=page%3D1|Forum thread]]) Also have not yet succeeded in reading the values from Linux.

===== Kernel messages =====
<code>
[17217.725904] usb 1-2: USB disconnect, device number 19
[17222.280704] usb 1-2: new full-speed USB device number 20 using xhci_hcd
[17222.409132] usb 1-2: New USB device found, idVendor=0483, idProduct=ffff, bcdDevice= 2.00
[17222.409151] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[17222.409158] usb 1-2: Product: Shizuku in Application Mode
[17222.409163] usb 1-2: Manufacturer: YK Lab
[17222.409168] usb 1-2: SerialNumber: 5A5AA5A6004E00473439510838363239
[17222.414835] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[17222.415891] usb-storage 1-2:1.2: USB Mass Storage device detected
[17222.416310] scsi host0: usb-storage 1-2:1.2
[17223.440649] scsi 0:0:0:0: Direct-Access     YK-Lab   Shizuku Platform      PQ: 0 ANSI: 2
[17223.441393] sd 0:0:0:0: Attached scsi generic sg0 type 0
[17223.455133] sd 0:0:0:0: [sda] Attached SCSI removable disk
</code>
===== Details =====

  * [[https://www.avhzy.com/html/product-detail/ct3|docs]]
  * power consumption of some devices, measured with the Satechi metering device:
    * Google pixel 4a: 
      * rapidly: 9V0.8A (power supply PD), 4.8V1.6A (thinkpad usb-c out)
      * charging: 4.6V0.7A (thinkpad usb-A out left side)
      * charging slowly: 4.7V0.5A (thinkpad usb-A out right side)
    * Thinkpad L480:
      * 20V@0.8A
  * devices with CT-3
    * input thinkpad usb-A left: PD3 5V
      * out right side usb-A, red cable: 5V@0.7A (pixel4a load)
    * input thinkpad usb-C: PD3 5V@3A
      * out right side usb-A, black cable: 5V@0.5A
    * input power supply: PD3 5V@3A, 9V@3A, 15V@3A, 20V@3.25A
      * out right side usb-A, red cable: 5V@0.4A (pixel4a load), 5V@1.7A (thinkpad load)
      * out right side usb-A, black cable: 5V@1.3A (pixel4a load), 5V@2A (thinkpad load)
      * out up side usb-C, white cable: 
        * 9V@0.7A (pixel4a load)
        * 20V@0A, "A correct CC attachment is detected, but no source_cap is received in time.", Thinkpad load

===== Why? =====
I want to see how much power for example the Thinkpad uses, and how accurate the internal computation from powertop is. 
  * Right now, I just managed to get the CT-3 to supply 5V to the Thinkpad, and with no load the Thinkpad then uses 3 or 4W.
  * Powertop shows a bit more, 5W, but correct scale.
  * Powertop supports direct interaction with a power meter, Extech* Power Analyzer/Datalogger (model number 380803), but these clock at $1000. The CT-3 just costs ~$60.
  * Unfortunately, I did not yet manage to digitally read the CT-3 values from Linux.