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OTG + power supply

Kai Morich 2024-06-30 10:54:01 +02:00
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FAQ.mediawiki

@ -1,12 +1,22 @@
This is a collection of FAQ-style troubleshooting tips.
== My USB device is not recognized ==
== Do I need an OTG adapter? ==
=== Android device and serial device with USB-C connector ===
No OTG adapter is required if the serial device correctly implements USB-C. Typically the the CC pins are connected to GND with 5,1 kΩ resistors each, to mark the device as USB peripheral.
=== Other connector combinations ===
Connecting an USB device with just an USB cable will not work. You have to attach an [https://en.wikipedia.org/wiki/USB_On-The-Go OTG adapter] to your Android device to switch it into host mode. This adapter typically provides an USB A socket, where you attach a standard USB cable.
== My USB device is not recognized ==
Check OTG adapter as discussed in previous question.
Check with an App like ''Serial Example'' in this project, if your device is shown. If no USB device is shown, check the web for [https://developer.android.com/guide/topics/connectivity/usb/host.html USB Host Mode] aka. [https://en.wikipedia.org/wiki/USB_On-The-Go USB OTG] support for your Android device. Missing support is more likely for older devices.
For an incomplete list of Android devices with known issues look [[Compatible-Android-Devices|here]].
For an incomplete list of older Android devices with known issues look [[Compatible-Android-Devices|here]].
== My USB device is recognized, but no driver is detected ==
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Most Arduinos with CDC-ACM driver use the DTR line to determine serial channel readiness. In your Android code, call <code>setDTR(true);</code>
== Can my Android device be powered by the external device? ==
Typically communication and power supply cannot be combined. Might be possible with USB-C and USB PD implemented in the serial device, but typical USB-C serial serial devices only use simple 5,1 kΩ resistors to GND.
== How do I access <code>/dev/ttyUSB0</code>? ==