The FrogPad
 
A forum to get help or talk about Roastmaster…or anything else coffee.

Connection thermometer or thermocouple to device via USB  (Read 2151 times)

coffee_fan

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I apologize if this question has already been addressed, but I wasn't able to find the answer in browsing the help and forums. I am wondering if it is possible to connect a thermocouple to the app via a usb connection using the usb/ipad adapter that apple provides. If I purchased a usb thermocouple, would I be able to set it up to provide real-time data to the app on the ipad in this manner?

Danny Hall

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Hi

Unfortunately, no. iOS doesn't offer true USB support, so Apple's implementation of USB for cameras via the adapter is a low-level thing not exposed to developers. In other words, all of the necessary USB protocol handling that exists on desktops, doesn't exist on iOS. It's possible to make a few things happen via that adapter, but only if code is exchanged in a protocol that emulates a keyboard, but that doesn't help with USB probes.

The good news is, that the next update will introduce a Data Logging option for one particular brand of open source hardware. I was code complete a few weeks ago, right before iPhone 5 hit the market, and ready to release. Once the phone hit, though, I decided to delay the update for a few weeks while I added support for the new retina screen, and ironed out a glitch with the iPhone's new Arm7s processor and the data logging hardware.

I am hoping to have the update to Apple within a week. I think I can finally say that with certainty - as nothing new iOS-wise is coming down the pike for a while to surprise me. I'll post a full write up on the blog with a link on the home page once the update is approved. From the conversations I've had with Apple, what I'm doing is not frowned upon, because it functions via Ethernet, but they won't promise approval until the binary is submitted for review. Otherwise, I'd post the details so folks could get the hardware now in the meantime. As it stands, it's just a bit too risky - I don't want people stuck with hardware if Apple decides to say no.

Cheers
Danny

coffee_fan

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Thank you for the quick reply. It would be really great if we could have that functionality, and so I'll keep my eyes open for future updates and to see what hardware I could buy to make that happen.