Automatic temperature control is a nice idea !
Actually some years ago I was in the need of an accurate enough thermometer for my bench ,
to be used on a LED grow light project of mine .
Used an Arduino UNO ,a reflow oven shield ,a B/W Nokia 5110 LCD screen with a custom -made MOSFET signal converter at it's plug ,couple of pots ,micro switches and made a digital
( K-type thermocouple ) thermometer .It has all the features needed for an
Automatic Temperature Control Induction Heating ( ATCIH ) device !
A real- time data LCD screen with the controls besides it .
A switch that :at position A kills the signal output ( OFF ) ,
at position B the signal output is ON
and at the momentary position C it resets the Arduino .
A button that when pressed the Junction temperature is shown for 5 secs
and two pots,one setting the Temp limit from 0 to 300 °C and the
other it trims (
micro-adjusts ) the latter for total 10 °C ( 'set value' +/- 5 °C )
tcK °C :
measured temperature at the tip of the K-type thermocouple
Sampling_Hz :
set sensor sampling rate ( 1,2 ,5 or 10 Hz )
<OUTPUT N_xx > :
preset TTL output state ( NO / NC )
State :
current TTL output state ( ON / OFF )
Limit °C :
preset temperature limit ( 0 - 300 °C )
At the rear panel there can be found :
-a 12 VDC input
- a usb socket as a
serial data output
- the K-type thermocouple input
and
- a TTL signal output ( RCA socket with a LED indicating HIGH +5 VDC state )
for operating a any device with a mechanical relay or a SSR one or
even an
induction heating module !
Underneath there are 4x micro swithes for selecting the sampling rate ( 1- 2 - 5 - 10 Hz )
and if the signal output will be
Normally Open or
Normally Closed before the measured temperature
reaches the set limit .When measured temp reaches the set limit or rises above it ,
the output will change to opposite state than the preset.
Thing is that all those electronics have a certain volume and need
the appropriate space when /if cased .
But for home -use desktop IH device that ain't much of an issue ,right ?
Cheers.
( i swapped tips and caps over and duplicated the test to double check)![:\](/i/s/hmm.gif "Hmm :\")
