Hi. I got a issue when try turn It on both board with same Power cable. The arduino stay with a one led Power light, and esp32-p4 with less light led. When I press RST from esp32-p4 board display, both turn It on. What I can do? The Power I connected on J1 because USB C dont make anything. This…

[image] jpbiaggi: What I can do? Welcome! It looks as if one of the boards pulls the supply voltage down during power-up. When you press RESET on the ESP32-P4, its load is reduced and the supply can recover, allowing the Nano to start. When RESET is released, the ESP32-P4 then starts with t…

[image] jpbiaggi: The Power I connected on J1 because USB C dont make anything. If USB-C does not work how will you download programs? J1: Are you sure you can connect power to J1, it may be output only?

I can use USB C conector to flash and power on with pc But on my device, I have a oscilating voltages on start, he drops and power up to 3.3v. when I press reset, the voltage its stable. I think could be boot mode, secure, strapping pins. but I can't confirmed any solution. I found these possib…

Like I said on reply above... I need operate with oscilating line on almost 10 seconds, because my device wake up and calibrating. I want to do boot strapping pin, maybe only gpio35, but I don't know where or what could be right.

actually Im trying to use only esp32-p4 to work with both code, I try that to reduce erro with arduino.. but even only esp32p4, I got same result. and was hard to do to get nothing changes. Im working on that for long hours, 5 days until now, Im autist and gifted. I got so many projects working... …

[image] jpbiaggi: oscilating line on almost 10 seconds What you describe now seems to confirm the power-supply problem I mentioned above. If the 3.3 V supply is oscillating/dropping during startup and becomes stable while RESET is held, I would not change any strapping pins. GPIO35 selects a…

[image] jpbiaggi: But on my device, I have a oscilating voltages on start, he drops and power up to 3.3v. Again I ask is J1 an output voltage or an input voltage? Exactly what do you have connected to J1?

Its same rail 3.3v ...I try to connect on 3.3v and 5v pins.. and stay the same.. honestly I dont know where. try on JP1 3,3v try on both pins... both 5v with boost, and esp33v... try on pin batery gnd and vcc.

Im trying simulate a steering wheel On T598-P Thrustmaster. He comunicate with CAN, 6 pins. Was using only arduino nano, and arduino work very well. and I will start to upgrade with this display on my wheel home printed 3D. I need use to comunicate with base, MISO, SS and SCK..now I think I will…

[image] jpbiaggi: honestly I dont know where. Neither do I. Do you have a datasheet or users manual for the ESP32 board?

Arduino Nano and Esp32-p4 won't turn It on same Power cable, only when press RST

Other Hardware 3rd Party Boards

jpbiaggi September 11, 2026, 10:11am 12

I got some files
Link

ESP32_P4_Chip_Datasheet_CN_v0.4.1_0320 .pdf (2,0,MB)
OV02C10_CSP_DS_2.01_Waching.pdf (4,7,MB)

JC4880P443_V1.0.pdf (1,0,MB)

Jc4827w543c problem

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Arduino Nano and Esp32-p4 won't turn It on same Power cable, only when press RST

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