ReflowESP bugs found

[LuigiPapparotti]

• To detect correct communication with the MAX31855, a pull-up resistor must be added between the MISO pin and VCC. Without a pull-up, random noise may appear that might look like real data.

  Read here: https://github.com/RobTillaart/MAX31855_RT?tab=readme-ov-file#pull-up-resistor

• Capacitors C1 and C5 are connected in parallel. One of the two is unnecessary.

[Weissnix4711]

Thanks. I'll probably never have a rev 2 of this board manufactured myself, but feel free to fork and fix this yourself.

Also, for what it's worth, I've never had any issues with using the internal pullup only.

[LuigiPapparotti]

That's really a shame.

I came across the problem after testing your circuit on a breadboard. If one or both MAX31855s fail, real temperature values ​​are still displayed. After inserting the pull-up resistor, I get the correct message "129 No communication".

I have since made the following changes to the circuit:

• Fix: pull-up resistor on the MISO signal line of the MAX31855
• replaced the ESP32 with an ESP32-S3-WROOM-1-N16R8.
• added a TF-SDCard socket.
• added an input to the inputs so that you can use either a rotary encoder or 4 x tactile push buttons.
• the resistors can be used as pull-up or pull-down via a solder jumper