←back to thread

DiyPresso: DIY Espresso Machine

(www.diypresso.com)
325 points ragebol | 1 comments | 12 Sep 24 19:00 UTC | HN request time: 1.251s | source
Show context
ManDeJan ◴[13 Sep 24 11:29 UTC] No.41530162[source]▶
A neat project for sure but as it stands this has major safety issues. The control logic is able to lock up and keep the boilers heating element in an forever "on" state till something snaps. I couldn't find a mention of safety in the manual nor see any mechanical safety failsafes in case of overheating.
replies(5): >>41530411 #>>41531453 #>>41532029 #>>41532521 #>>41532848 #
cdaringe ◴[13 Sep 24 14:11 UTC] No.41531453[source]▶
Are you speaking from experience or did you just study the f/w? I agree, gotta have those thermal switches, and they need to result in killing power on threshold breach.
replies(1): >>41539072 #
1. ManDeJan ◴[14 Sep 24 11:26 UTC] No.41539072[source]▶
I read the firmware, it's build with the Arduino IDE and PWM for the heater element is bitbanged and updated from the main loop. Meaning it can easily get stuck sending a MQTT message over wifi when it loses connection, causing the heater to possibly be left on indefinitely.