How to solve the crash when the single chip computer is powered on

65723107

You need a single-chip computer to control a group of MCB relays in your work, and you want to use an existing learning board to transform and use it.

However, during power-on, all indicators will occasionally turn on and the program will not run. Occurrence rate is 3/10.
Several crashes were found overnight.

I need him to run stably, and re-energizing the breakpoint can automatically run stably.
How do I transform, thank you for your attention!

kira0825

It should be a circuit problem, try to protect the control pins

linden99

See if the reset signal is not connected well

kalishu

Post the program to see

owen810

Is the driving capability sufficient? Triggering at high or low level? The drive relay is generally connected to the photocoupler at the output.

5022219022

Power-on delay

65723107

Please give pointers on how to improve the circuit and add some circuits?
What should I do when the power is on?
Is the reset signal a reset key?

linden99

There is a reset pin on the MCU, some are high reset, and some are low reset. After power-on reset, it is necessary to maintain a stable non-reset level, otherwise it will always restart reset

5022219022

Power-on adds a delay. In addition, the power supply is also very important. Have capacitors been added to both ends of the power supply?

prince_l

The relay is a strong interference for the microcontroller, especially when it is in action. There is no interference if there is no action.
Check it on the Internet: Relay, spark suppression