Edwin Cho

ehcho@andrew.cmu.edu

Alumni in Electrical and Computer Engineering

Tea Time

Are you tired of ordering milk tea all the time to only find it to be too sweet or lack tea flavor?

@ehcho, @kylow, @jaimechu, @tchiang

Tea Time 28 Nov 2015, 6:50 p.m. EST
Draft Block diagram created
Tea Time 28 Nov 2015, 6:50 p.m. EST
Draft Parts List Created
Tea Time 05 Dec 2015, 10:58 p.m. EST
Added Power Supply
Tea Time 14 Jan 2016, 2:30 a.m. EST
1/11: Meet with group to plan roles and check for missing components.
Tea Time 14 Jan 2016, 2:29 a.m. EST
1/12: All components tested: FSR tuned and working, pumps tested with motor driver, RTD fixed and now working, and finalized architecture and protocol.
Tea Time 14 Jan 2016, 2:21 a.m. EST
1/13: Master and module code written and tested with partial hardware. AC wiring completed, and began soldering onto perfboards. Begin working on PID tuning of water heater.
Tea Time 14 Jan 2016, 2:27 a.m. EST
1/14: Tuning PID
Tea Time 14 Jan 2016, 2:49 a.m. EST
1/14: SSR for water heating slightly warm will require basic heatsink
Tea Time 14 Jan 2016, 3:39 a.m. EST
1/14: Kp 15.94, Ki 0.08, Kd 0.00 works but might need more gain
Tea Time 14 Jan 2016, 6:03 a.m. EST
1/14: Wrote PID module, and system seems robust enough. Still need to improve settle time. Max temperature is around 97C. Still need to see if the controller can handle PID control with pump control concurrently.
Tea Time 15 Jan 2016, 5:14 a.m. EST
1/15: 5:12AM Broken motor controller from the past causing problems. Solution found and applying. The morning is slightly getting louder. Hope is fading and time is running out. Heads are dropping one by one. A trip to roboclub from the makerspace has revitalized one. Maybe we should go run in circles. 2PM!
Tea Time 15 Jan 2016, 9:31 a.m. EST
1/15: 9:30AM Blood has been spilled. Found a problem where a pin wasn't soldered. All pumps are running. Our fuel is low and we have to wire stuff outside.