Hello, I have set up a circuit as described in the picture. The circuit works so far, the esp switches all relays and switches on the circuits. The problem is that as soon as I connect the motor, which is connected to relay 4, with the 9v power source and switch relay 4, the motor starts up for about 2 seconds and then the esp restarts and the relay closes again. The motor should not actually be able to take any electricity from the esp, since it has its own circuit with the motor of reais 2. if I take a new 9v power source and connect the motor to it so that the motor on relay 4 has its own circuit, everything works again. Where did I go wrong? Thanks in advance!
Daniel Sticker wrote: > then the esp restarts You experience the wonders of electromagnetic interference. Electronics is not just the connecting of presoldered boards like Lego. Creating emi resistant circuits is an art.
Daniel Sticker wrote: > The problem is that as soon as I connect the motor, which is connected > to relay 4, with the 9v power source and switch relay 4, the motor > starts up for about 2 seconds and then the esp restarts and the relay > closes again. Measure the voltages with an oscilloscope. There may be a short voltage breakdown due to the inrush current of the motor. BTW: its kind of tricky to read your scribbledy as a schematic, so one question: do i see there a stepup from 5V to 12V for driving a motor? If so: do you think thats a good idea? If so: why do you?
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Thank you very much for your answer! I'll try to measure the voltage. what you deciphered is correct, i installed a step-up from 5 to 12 v. Only a small fan is operated with it and i only had the 5v energy source.
should i try to cover the esp power cables with a grounded aluminum or copper foil to fix the electromagnetic interference?
Daniel Sticker wrote: > should i try to cover the esp power cables with a grounded aluminum or > copper foil to fix the electromagnetic interference? No. You should do a proper wiring with a reasonable GND and supply layout. > and i only had the 5v energy source. From where? Does it deliver enough current? And what about >>> the 9v power source you mentioned? What kind of "power" is that? Hopefully not a 9V battery like that: https://en.wikipedia.org/wiki/Nine-volt_battery Those things are not suitable power sources for develompent! With those you always will run into some kind of power fail or power breakdown. Take a loadable power supply aka "laboratory power supply": https://www.tme.eu/en/katalog/one-channel-power-supplies_112661/ or https://www.aliexpress.com/w/wholesale-lab-power-supply.html Even the cheapest of those will outrange your battery-supply by far.
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