[time-nuts] Poor man's oven

jimlux jimlux at earthlink.net
Tue Jun 6 15:54:40 EDT 2017

On 6/6/17 11:47 AM, Chris Albertson wrote:
> Yes, as I wrote.  I would not mess with AREF.  At most you can only get a
> multiplication about 4.   Use an op-amp.   Signal conditioning really
> almost alway is required in the analog domain before any A/D conversion
> Also like the uP is not inside the oven and has a cable of some length so
> you'd want a buffered analog signal on the cable, the op-amp can do that
> to.
> Those $2 parts I linked to have the ADC referenced to 3.3 volts but have 12
> bits as compared to the arduino which has 10 bits

or use a Teensy with a 16 bit differential input ADC.  Arduino 
compatible, cheaper, yeah, you probably get 13 bits real performance 
from the ADC.  Also has a real analog output (not PWM and a LPF) if you 
need that.

Programmable gain, sample averaging in hardware, etc.   Not bad for <$20.


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