I have designed my own PICO board using PICO D4 SoC with help of the document : ESP-PICO-D4-Datasheet. Everything works perfectly fine except heat is produced when chip is using WiFi functions.

I have tested with blink and Wifi sketch for a week and no issues found (without plastic case covered) . My plan is to put the same board behind wall switch and will have an plastic enclosure also. Only SoC chip gets heated no other components are impacted.

Is it safe to put behind wall switch?

Does simple heatsink on SoC would solve the problem?

Can I proceed avoiding this? circuit diagram

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    \$\begingroup\$ A badly matched antenna circuit could cause a high VSWR and feed power back into the transmitter, which would cause heating. If that's the case, I would expect to see issues in FCC emissions testing as well. \$\endgroup\$
    – vicatcu
    Oct 9 '20 at 12:25
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    \$\begingroup\$ Do you have someone else's board to compare the software on? I suspect an issue somewhere but you provide almost no information about your design. Is there a die pad on the chip? What have you connected it to, and how? What is the power consumption, and is that normal? \$\endgroup\$ Oct 9 '20 at 12:43
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    \$\begingroup\$ The D4 seems pretty poorly bypassed, not sure how that affects wireless performance.. (yes there are internal caps but.. anyhow) \$\endgroup\$
    – Wesley Lee
    Oct 9 '20 at 12:47
  • \$\begingroup\$ I'd like to see that the back of that is mostly ground plane with the die pad stitched to it with a number of vias (yes, have to be careful for solderability but it can be done) and also stitching vias between that and the front ground pour... The fact that I see essentially no vias in that pour at all is worrisome. And is that odd diagonal trace from c4 really the recommended way to feed that antenna? \$\endgroup\$ Oct 9 '20 at 14:03
  • \$\begingroup\$ @ChrisStratton Have updated all info about circuit and PCB top & bottom images too.. \$\endgroup\$
    – abab
    Oct 9 '20 at 15:31

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