No temperature number show up

polihedron / DIY-Reflow-Oven

DIY Reflow Oven, mcu: STM32F103 dev board, Display: Nextion Basic 3.5", PID controller.

BSD 3-Clause "New" or "Revised" License

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No temperature number show up #3

Closed botio closed 2 years ago

botio commented 2 years ago

I wired everything and flash the firmware to the blue pill and the NEXTION display, but there is not temperature number just show up empty UI... and I have tried to find out for two days... even tried another blue pill... please help me!

polihedron commented 2 years ago

It's hard to guess,

make sure that connections are ok,
with USB to UART converter check that nextion can read and send data,
the same with bluepill, connect converter to bluepill and try to send commands via terminal.
replace level shifter module
switch rx with tx
flash 1.1 version firmware (without modifications, maybe binary is the cause)
compile source and flash bluepill using STM32CubeIDE
check all connections again, and again. It's quite simple mod, if you follow all steps from Vulcaman's instructables then it should be working.

botio commented 2 years ago

Thank you so much, I found the solution is to clean the flash first and reprogram it with v1.1 bin file. Everything works fine now. next step is adding fan ... or not.

polihedron commented 2 years ago

Adding fan can be tricky, because air temperature is quite high, easier and probably cheaper method is to look for convection oven, or find some replacement fan of the convection oven (they has metal sheet blades).