firmware – PCB Artists

2 Tested Solutions – [Errno 121] Remote I/O error

This article mentions two tested solutions to solve [Errno 121] Remote I/O error when using I2C via Python on a Raspberry Pi.

The ESP32 crashes on esp_netif_internal_dhcpc_cb() when being used as a NAT router with cellular modem and Wi-Fi or ethernet – SOLVED!

Notes on how to port ESP32 code to ESP32-C3. Based on ESP-ADF ES8388 driver code ported to work with ESP32-C3 audio applications.

With example code, this article covers ESP32 SIM7600 4G LTE cellular modem interfacing using Arduino IDE. Hardware used is ESP32 Gateway.

ESP32 PPPoS modem “esp_modem_dte_send_cmd(): process command timeout” error, causes, and some solutions that work with SIM7600 and A7670.

STM32 “USB device not reognized” and “failed to read USB device descriptors” are very common issues. We list the most common solutions here.

Solutions for ESP32 boot loop error:
1162 mmu set 00010000, pos 00010000
1162 mmu set 00020000, pos 00020000
1162 mmu set 00030000, pos 00030000

This article illustrates an easy way to sync ESP32 NTP and DS3231 RTC time so that ESP32 can use the RTC chip seamlessly in an application.

The ESP-IDF contains functions for enabling Base64 encoding and decoding on ESP32. The encoding and decoding functions are actually built