[Help Needed] DC Noise Affecting Arduino – SPWM Inverter

Author	Message
jony787 Newbie Joined: 07/01/2025 Location: Puerto Rico Posts: 7	Posted: 11:33pm 26 Mar 2025         noneyabussiness said   I'll get this started... I had issues with SPI communication and noise on a lcd in my eg8010 setup, lock ups etc. I ended up using shielded Ethernet cable, (Grounded the shielding), it still has locked up once since then in the last 12 odd months.. Just imagine every wire is a antenna,  so if possible move it away from sources of " noise " and even try wrapping and grounding the sensor wires.. if you are using a pcb, keep it all away as much as possible and lots of ground plane on noisy lines, shielding and ground where possible.. on a side note, try dropping the 36-50v to say 12v, then drop it to 5v with a linear regulator,  quieter and stil low dissipation. Hey noneyabussiness thanks for your reply. I started the project with an Arduino Nano 328p and had a lot of display issues like you mentioned. Using the Arduino Nano Every ATmega4809 have solve almost all my previous display issues. I see your point in terms of the lowering the voltage, I actually go from the battery voltage to 15v via an LM2576HVT-15. before the 5v power stage. I had a LM7805 and the 20khz noise still present. I will look into shielding what I can and will also need to test the inverter connected to the batteries. Ill have to revise the PCB and will look into improving the  grounding across the board. Thanks for your feedback.