I tried with a ESP-WROOM-32D dev board and it works. With the "BLE/Write" example i can write in the iOS app (BLE Scanner) and the text shows up in the serial monitor via the ESP.

Regarding the battery. I'll definitely try more caps. It could also be the problem that battery goes though a MOSFET but USB goes through a schottky. I have a power path circuit that disconnects the battery when USB power is present. Similar to the attachment. What could be the problem then? I ran X...

I have followed the design guidelines to the letter and have 10uF+100nF+2nH+1uF on VDD3P3, 10nF+1uF on VDDA, 100nF+1uF on VDD3P3_CPU and 100nF on VDD3P3_RTC.

I cannot connect to clients over bluetooth with my ESP-C3. I program with Arduino and can scan and list nearby clients with success (BLE/Scan example), but I can't connect to my iPhone app BLE Scanner (for this I used BLE/Write arduino example). BLE scanner just reports connection time out. I read i...

No luck. I disconnected the 3.3V onboard voltage regulator and I tried to inject directly with a stable power supply. Still 600mV ripple when BT is active. Any obvious problems with the routing?
(PS. two antennas (trace and chip), but only trace is connected.)

I just designed a custom board with ESP32 C3 (chip, not module) with a UART-to-RS232 module connected to U0RX/U0TX (pin27/28). The problem is, I need print for debug messages, but this automatically ends up on the same U0RX/TX. I use Aruindo IDE and/or PlatformIO. As I read in the datasheet, C3 only...

I just discovered a huge ripple (500-800mV) on the esp32 VDD. It's only present when BT is active.
Hopefully that takes care of it.

I've made a custom board with ESP32-C3 (bare chip, not finished module), 2 layers PCB-A. I've followed the schematic recommendations in the hardware design document to the letter, but did not duplicate the routing (although I have made good efforts and have lot of routing experience, not so much wit...