This weekend I finished* retrofitting an osPID to my $15 target popper (900W). The osPID is an open source (hardware and software) PID controller, based on an "arduino compatible" board. I got mine from RosketScream electronics in Malaysia for $85 and it arrived by fedex in 1 working day!
I still need to play around with tuning parameters, but I'm pretty happy with the result. Roasted (and tasted) some Yemen Bani Ismail this morning, and some Ethipian Harrar tonight. Below is a screenshot from the interface software for the PID, of the Harrar.
Notice the temperature never quite makes the final stage setpoint of 220C - this is the popper reaching it's limits in the cool weather (despite being enclosed in a box for heat retention). Planning to mod my 1200W popper next to avoid this issue.
The spike at the beginning I think is a parameter tuning issue.
*my projects never finish....
I still need to play around with tuning parameters, but I'm pretty happy with the result. Roasted (and tasted) some Yemen Bani Ismail this morning, and some Ethipian Harrar tonight. Below is a screenshot from the interface software for the PID, of the Harrar.
Notice the temperature never quite makes the final stage setpoint of 220C - this is the popper reaching it's limits in the cool weather (despite being enclosed in a box for heat retention). Planning to mod my 1200W popper next to avoid this issue.
The spike at the beginning I think is a parameter tuning issue.
*my projects never finish....
Comment