STC is getting really warm

[tjarmann]

I have two STCs with the STM8S003F3, and I upgraded them before testing them. Now, I notice that they are getting a lot warmer than other STCs I have (the one matsstaff fiddled with). I insulated my probe and stuck it in the STC case, and it is measuring~50 C. Is this normal? Are these STCs like this regardless of the firmware? I feel reluctant to enclosing this in a box and having it on for weeks..
The probe is not calibrated, but i can feel the heat coming of the STC.
There is no load on the relays.
I have two probes connected to the STC, and the ambient temperature is (uncalibrated) ~20 C.

Update: Inside the case, close to the little transformer, I now read 72 C. It's been running (still without load on the relays) for four hours.

I am new to github and have no idea how I should contact you, so this is how i chose to do it. I am sorry if it is the wrong way.

[Emile666]

Tjarmann, I have never noticed any problems with the power-supply of these devices. However: the power-supply on the board is pretty small and can only deliver a small amount of power. But again: never had a problem with it. Fifty degrees is about normal I would say, it should not get above 80 degrees. It is very well possible that with my firmware the device has to work harder and thus draws a bit more power. I would say that it is good to keep an eye on it, but don't worry too much about it. Regards, Emile van de Logt From: tjarmann [mailto:notifications@github.com] Sent: donderdag 14 juni 2018 9:35 To: Emile666/stc1000_stm8 Cc: Subscribed Subject: [Emile666/stc1000_stm8] STC is getting really warm (#6) I have two STCs with the STM8S003F3, and I upgraded them before testing them. Now, I notice that they are getting a lot warmer than other STCs I have (the one matsstaff fiddled with). I insulated my probe and stuck it in the STC case, and it is measuring~50 C. Is this normal? Are these STCs like this regardless of the firmware? I feel reluctant to enclosing this in a box and having it on for weeks.. The probe is not calibrated, but i can feel the heat coming of the STC. There is no load on the relays. I have two probes connected to the STC, and the ambient temperature is (uncalibrated) ~20 C. I am new to github and have no idea how I should contact you, so this is how i chose to do it. I am sorry if it is the wrong way. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#6> , or mute the thread <https://github.com/notifications/unsubscribe-auth/ASWwh-AakUcCQsnq9bg-G9TvOHEnUMxgks5t8hImgaJpZM4Unc4H> . <https://github.com/notifications/beacon/ASWwh95alq4VWVCBmz-5DF8HWpE3Nb_yks5t8hImgaJpZM4Unc4H.gif>

[tjarmann]

I finally got a hold of a FLIR camera and checked the STC out. The tiny transformer is definitely the culprit, heating up to 140C. I doubt this has to do with your firmware. The label on my STC says 110-220V, but my outlet is 230V. I'm guessing that my device has a transformer that is badly scaled for 230V operations.

Anyway, thank you for your response :)