Checking before powering on..


 
One other question.. my blower is now attached and I'm testing. I have it set so the set temp is 220, and the pit is 63 - so the blower is 100%.

The blower duty cycle is about 50%.. on for one second off for one second (roughly). Is that expected?
 
Nope that doesn't sound right at all. It should be running at 50% speed. The only on/off cycle similar to that is a 10 second cycle, if you had your minimum fan speed set to 100%.

When the blower turns off, does the backlight on the LCD blink off, indicating the device is rebooting every time the blower turns on?
 
Hi Bryan,

The backlight stays on, the system doesn't seem to be rebooting. The 12v (13v measured) supply is constant. Looking at my voltmeter, the voltage swing is about every 3 second from 12v to ~0v. The center pin on the power FET is doing the same. The inside pin (nearest the 4-way button) is solid at 13.03V, and the pin closest to the blower seems to swing from ~10V - 13V.

Sounds like you suspect a power/gnd short on 12v?

Note, my 12vDC wall wart is 1.25Amps, is that enough? I wonder if I'm suffering brownout..

Best regards,
Jeff.
 
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Hi Peter,

Once set to pulse, (with fan @100%) the voltage stays at 12.5V...

Is that the solution? Please tell me this isn't another NOOB question! I'll need to lower a setpoint and test..

Best regards,
Jeff.
 
Jeff Connell said:
Hi Peter,

Once set to pulse, (with fan @100%) the voltage stays at 12.5V...

Is that the solution? Please tell me this isn't another NOOB question! I'll need to lower a setpoint and test..

Best regards,
Jeff.
Click to expand...

There is probably something wrong with R4(22k),R13(68k),R19(100k) or C7(0,1uF). My guess would be R4.
 
Genius! Sorry for the late reply - I've been fabricating a blower housing for my big green egg.

You got it with R13, 68K!

I had another issue - my "up" didn't work. I had R8 (680K) and R13 (68K) swapped. I was going to look into that later.. now everything seems 100%.

I'm dangerous now...
 
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Golly, Peter. You may be even better at knowing my hardware than I am, you're certainly faster with responses!

Glad you got it working Jeff!
 
I've see the Pi touchscreens but HeaterMeter doesn't have a Xwindows GUI at all. I've suggested that for the same price you can get an e-cheapo 7" tablet which will work 100x better in terms of ease of use, responsiveness, and readability and just glue it to your HeaterMeter if that floats your boat.
 
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