Usb host shield issue workaround READ THE DESCRIPTION FOR UPDATE

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UPDATE:
The issue with the duff host shields has been found. The chip labelled AHC on the board is typically NOT an AHC, rather a HC (74HC125 to give it the full title). If you replace that chip with an actual 74AHC125D chip, the issue is resolved. I have now converted 6 boards and all work perfectly. See other video for how to do it.
Original text:
If you’ve been having problems with getting a usb host shield to work when building your Padawan 360 system, this just might be the best solution.

[@chrisjshumate]

I've had the same trouble. The chip issue explains why I was able to make it work by lowering the board voltage to around 4.2V. (42 is always the answer). That's not a permanent solution, but was a clue. Thanks for the update.

[@ImperialLightandMagic]

Ahhh the answer to life, the universe and everything

[@pierpa_76pierpaolo]

Arduino Mega ADK has usbhost built in on the main board. however, I tested the usbhost shield module on original Arduino UNO but the usbhost does not work even after soldering a few pads. The usb is perfectly powered. But a myriad of errors during compilation. :(

[@ailurii]

Do you think an Arduino Giga R1 would work well for this as well?

[@ImperialLightandMagic]

Sorry I have no personal experience with the Giga R1 so don't really feel qualified to answer.

[@jrenzo0001]

Is the USB host shield issue a new issue??? I dont see you having trouble with it on your earlier videos from a few years age. Can usb shields be purchased with the correct chips installed?

[@ImperialLightandMagic]

Some of the branded ones (Such as SainSmart) do work out of the box, likewise if you buy a Mega ADK board (which has build in USB), no issiues at all, however, just about every board I've purchased off Aliexpress or similar has had the non-AHC chip issue, although it IS relatively trivial to switch them over (once you've bought some AHC type chips)

[@IanAuty-s8u]

Hi, any recommendations on where to source the 74AHC125D chip (UK would be great) or advice on how to fix/convert?

[@ImperialLightandMagic]

I ordered some from Aliexpress and they came down pretty quickly. I’m doing one tomorrow so I’ll try to video it.

[@IanAuty-s8u]

​@@ImperialLightandMagic awesome thanks

[@jonathanstringer3353]

The only problem here is that the Mega ADK is discontinued and not available to buy anywhere that I have been able to find.

[@ImperialLightandMagic]

£34 from Aliexpress