The FrogPad
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Messages - Danny Hall

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Wish List / Re: Datalogging support for power meters
« on: May 15, 2020, 12:35:52 PM »
Hi Trey

Lots is changing in the coming version of Roastmaster in the area of Data Logging.

First of all, Control Curves will now support data logging. Beyond that, it will introduce the concept of "Scales" beyond the standard temperature scale (Humidity, Pressure, Agtron, etc.).

All of these (and several others) are means to the end of goals like you mention. I don't want to talk a lot on the forum about those features yet, until I'm in beta (very soon), but shoot me an email at'd be interested to know more about the power meters you mention and can speak a little more openly.


Support / Re: Cataloging Beans - New Roaster; New User
« on: February 24, 2020, 06:30:50 PM »
Hi Stephen

Don't worry too much about it. Whenever displaying the collective "name" of a bean, Roastmaster simply concatenates all of those fields together in the order those identifiers are displayed - regardless of which field contains the information.

Sometimes Tom will call out which is an estate or market name in the description, often he won't. It would take an awful lot of research to stay on top of that information. Some roasters have a direct relationship with farmers, so that distinction is important to them. Others aren't concerned with it at all. Many of us (myself included) typically just input the full name into the first field - the end result is the same.  :)

Support / Re: Currency
« on: February 19, 2020, 06:35:15 PM »
Sorry - no. Unlike temperature, weight, volume and density measurements, where Roastmaster translates among static scales, exchange rates for currency is always evolving. Roastmaster records the currency exactly as you enter it - displaying the units according to the current iOS region setting in Settings>General>Language & Region>Region.

Support / Re: Rate of Rise Curve
« on: February 05, 2020, 04:14:20 PM »
Yes - Roastmaster refers to those as Delta Curves. They are the bottom two curves seen here at 15:40...

You can enable those globally in Preferences > Analyzer, or two finger tap in the analyzer to toggle them on or off for individual curves.

Wish List / Re: Hottop KN-8828B-2K+ USB support
« on: December 16, 2019, 02:55:10 PM »
Hi Siobhan

Thanks for the kind words, and sorry for late response...I've been baking and programming prototype circuit boards pretty heavy over the last week.

I do hope to offer a USB solution of some type at some point. When building Roastmaster, of course, USB was not even a consideration, so I concentrated on building wireless solutions. But, USB is stuck in manufacturer's brains like glue, despite Bluetooth LE being a much better solution IMO. That was part of the the reason I began designing and building the custom hardware I mention for use with RM, along with the RBP protocol - to provide (in addition to temp sensing) a wireless "bridge" for USB devices.

Now...with the new iPad pros with USB C that may change. I will evaluate all of that once the hardware is in full beta testing. I have yet to look into exactly what is possible programmatically with Apple's implementation of the USB protocol. From the products coming to market, I assume is it fully open. Though, historically Apple has avoided that like the plague, so I remain skeptical. If it's open (and I hope that it is) it would be a straightforward proposition.

Either's in future plans. Thanks for reaching out.


Roasting / Re: Boca Boca small roaster 500gram
« on: December 02, 2019, 10:25:17 PM »

I would recommend the Thermal Blue with a K type thermocouple. The ThermaQ Blue communicate with Roastmaster over Bluetooth LE, and is very reliable and accurate. The size of the K type thermocouple you need would depend on the layout of your roaster. The tip should hit the bean mass as closely as possible.

Sorry, no...Roastmaster does not run on Windows.

Let me know if you have any other questions.


Wish List / Re: USB-C connectivity on iPad Pro (Bullet R1)
« on: August 27, 2019, 01:56:15 PM »
Thank you - I appreciate that!! Lots of cool stuff coming in the next version...and more planned after that!!  :)

Wish List / Re: USB-C connectivity on iPad Pro (Bullet R1)
« on: August 19, 2019, 12:43:21 PM »

Thanks for the kind words. I thought the same about the Bullet, so I reached out to them last year...wanting to get that ball rolling. I've heard nothing back. That would be the first step. Afterwards, I'd need to determine if the USB C is actually a full-blown USB, or is (as per Apple's style) a watered-down USB - that only passes through certain subsets of protocols (camera, keyboard, etc.). I'm unsure at the moment - I've had my head so deep in electronics manufacturing and the next version of Roastmaster since the iPad pro hit, I haven't been able to export that path since last summer. If so, that would be very easy. If not, there would require a hardware box to receive the USB, and translate into Roastmaster's existing RBP protocol. I'm current entering manufacturing on Bluetooth hardware for thermocouples. After that is underway, I will think of designing a similar hardware device that could do the translations (for all types of roasters with USB) if Apple's USB implementation is NOT as open as I would like. After this hardware, I will be back to tie up a lot of loose of those will be trying again with the Bullet people to see if they are interested (or manning their web forms better) at that point. :)

Support / Re: Supermechanical temp probe
« on: August 05, 2019, 04:14:19 PM »
Sorry - no. I was involved with the kickstarter campaign for the BT series, anticipating adding support, but they never sent the API to me. Last we spoke it was unfinished. I've since assume they decided to keep the API private, though I don't know that for sure.

Support / Re: RDP DIY
« on: July 26, 2019, 02:08:15 PM »
Sorry - no. I've been waiting on LCD screen tooling (took forever). That was the biggest hurdle. Just got the prototypes in about a week or so ago. Working on the final boards and case production now.

Support / Re: Help With Roast Data Logging
« on: July 26, 2019, 02:05:12 PM »
Hi Gil

The easiest solution is to use K Type thermocouples with the ThermaQ Blue. You can see details here.

The ThermaQ Blue cal be purchased on the Thermoworks website here. They ship internationally.

As far as the thermocouple probes themselves, you can buy them from Thermoworks, or anywhere online. Just make sure they are K Type probes with the yellow "quick connector" on the end. I, myself, prefer shielded (ungrounded) probes, because their temperature reporting is smoother (albeit a little slower). Just make sure they are sized appropriately for your roasting chamber. Thermocouples CAN be bent for fitting, AS LONG as you do it on a radius (no sharp bends - only curves), and you don't bend within an inch or so from the tip where the actual junction is located.

Amazon is a good place to look for probes.

Wish List / Re: Go beyond 30 min “Roast”
« on: June 17, 2019, 01:56:59 PM »
No - sorry, the longest roast time is 30 minutes.

Support / Re: RDP DIY
« on: June 14, 2019, 06:12:22 PM »
Sorry to break your hope...but, it won't be. The first model will have 10 channels of data - reading much more than just temperatures. It is geared at specialty roasters and comprehensive home setups.

Down the road, I do plan on designing a light model - but at this point don't have any kind of time frame.

Wish List / Re: Development from 1st crack
« on: June 14, 2019, 01:53:59 PM »
Hi Kasper

See attached screenshot.

If you enable the HUD in the Analyzer, you'll see running tallies of the following

1: Drying Stage. This is defined by the presence of an Event, with its type set to "Drying End"
2: Ramp Stage. This is defined as the time from the Drying End Event to the First Crack (beginning of development)
3: Pyrolysis: This is defined by the presence of an Event, with its type set to "Pyrolysis"
4: Development: This is defined as the start of first crack to the end of the roast.

In this HUD, Roastmaster displays real-time tallies of each of these as
1. Duration in minutes and seconds
2. Percentage of time of the whole roast.

So, Roastmaster's Percentage of Development SHOULD correlate to the information on the link you sent, i.e. Rao's Development Time Ratio. Just keep in mind this a percentage, not a true ratio - that's a different thing altogether.

If you're interested in learning how to use events, there's some good information in this screencast.

Support / Re: RDP DIY
« on: June 14, 2019, 01:25:18 PM »
Yes - it is no small undertaking. Fun...but involved.

I don't plan on supporting any more thermistor style probes like the one in the link you sent. They are fine for kitchen use, but the internal windings tend to fail very quickly in a coffee roasting environment - and they usually don't even cover the required range for most roasters.

The only Bluetooth option at the moment is the ThermaQ Blue, until later this year when I plan to have Roastmaster branded hardware ready for purchase.

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