Hi,
I’m setting up new O-1PST, but to place it outside (on the roof) I need some longer cable than included 4m long. I bought 5m USB-C extension cable, but it’s not charging. What is maximum lenght of extension I can use? 2 meters should work?
16 ft is the longest recommended for USB 2.0 spec but you aren’t needing data at that length, just power.
I would have thought it would work, but if you are at 9 meters you are over double the recommended length.
5m should still work, jou just need a quality cable with lower resistance, so less voltage drop. try high w rated cable for 100w+
I read the original post as still using the 4m cable plus a 5m extension cable. Could be mistake.
if you need longer cable than 5m you can put powerbank in between.,
Hi @imari , anything USB is my favorite topic!
I wonder what your 5m extension cable is like. Is the male side a USB-C or USB-A?
If the male side of the extension cable is a male USB-C, and you plug it into a USB-C outlet (female) of a power adapter. I guess that the charger (power adapter/power supply) doesn’t detect that there’s a device connected to it (USB negotiation fails).
While a standard USB-A outlet of a power adapter will always live at 5V, no matter if there’s a device connected to it or not, a USB-C outlet is different. USB-C won’t be live until it detects (negotiates with) the end device.
What I have tested is that my 5m USB-A (male) to USB-A (female) extension cable, plus the original 4m USB cable of the AirGradient Open Air, can get my Open Air up and running. The voltage at the end of the Open Air cable (Male USB-C) is around 4.8-5.0V (I tested with both a 5V USB-A power adapter and my power bank with a USB-A outlet as a power supply). Voltage depends on your power supply and cable quality.
While it’s not usually recommended to run a USB cable this long, as it could cause a voltage drop and interference, I just want to demonstrate that it could still work (but I really have no idea how it would perform in the long run). I only tested this for 5-10 minutes. Have never had a real Open Air setup with this same configuration yet.
It’s important to note that the SenseAir S8 (CO2) sensor used in the Open Air, is sensitive to abnormal voltage (I’d say lower than 4.5V), its CO2 reading will spike tremendously, basically your CO2 reading will be unusable.
Also, if the voltage is lower, if not boot up at all, your monitor could be stuck in a boot loop, as it can boot up first, but then is unable to operate normally.
3 Likes
FWIW, I used the following to power my outdoor sensor. It is weather proof, sufficiently long and has the necessary wattage to power the device.
Thanks all, I will have to elaborate more. I used this extension cable connected to original one: https://allegro.cz/nabidka/prodluzovaci-kabel-5m-spojka-napajeni-pro-kamery-prodluzovaci-kabel-usb-c-14013201916
1 Like
Finally I bought 3m extension and this time it worked. https://allegro.cz/nabidka/prodluzovaci-kabel-usb-c-3-m-logilink-usb-2-0-c-m-na-c-f-pd-60w-480-mb-s-cerny-17862266603
Then I had to increase wi-fi power to reach the roof. Eventually my data are online 
1 Like
Thanks a lot for the update!