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· 05/27/2020 10:14 AM
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· 04/02/2020 4:50 AM
Morning Ed, I haven't done any green coffee hoarding yet but am hoping the supplies don't end up like the toilet paper isles!

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Hey Ed. Thanks. roar

· 03/31/2020 11:21 AM
Hey quarantined home roasters! I hope you have great coffee! If they have a run on coffee, I hope you're set with your great home roast! Find me on Facebook! Ed Needham

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Initial TC4 Setup for Newbie


CharcoalRoaster wrote:

I understand and that makes total sense. Perhaps if I ask it this way, with the TC4 wired into the heater and blower power when main power source is plugged it does the heater and blower wait to fire up until commands from the board?

For safe testing of new circuits without the danger of heating element meltdowns, I always substitute a 100 watt incandescent light bulb (not LED) in place of the real thing. Although you'll need to use the one hot leg from your SSR and a neutral. Leave the blower hooked up as it will be and test away.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
I agree with Allen that you should test with an incandescent light.

However, the TC4 should not power up any outputs on start up. It will only switch on the power to outputs once a command is received or a potentiometer connected to an active analog input is changed.

If you're using potentiometers connected to the analogue inputs, then I suggest you have them turned completely to the off position when starting up. If they're not completely off then their value may potentially change slightly from one read to the next, triggering an output to power on.

Also, there is an option in the user.h file (HTR_CUTOFF_FAN_VAL) which can be set. If the fan power is below this set value, the power to the heater will be cut off.
I'll be sure to hook up a light bulb and see how things go. I'm using Brad's wiring diagram found in the TC4 setup guide pdf with pots installed so I'll be sure to have them in the off position before initial fire up.

Quick question on that user.h file -- what's an ideal input value for that particular file?
The user.h file has lots of settings you can adjust. The user guide discusses all the options.

If you are specifically referring to the HTR_CUTOFF_FAN_VAL value, there's no ideal value. It depends on your roaster element and how powerful your blower is. I would recommend roasting a few times and then setting HTR_CUTOFF_FAN_VAL to a value a bit lower than your usual minimum needed blower value.
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