© 2026 Hedgehog Software, LLC

TwitterGitHubDiscord
More
CommunitiesDocsAboutTermsPrivacy
Search
Star
Setup for Free
DevHeads IoT Integration ServerDIIS
DevHeads IoT Integration Server•14mo ago•
21 replies
Gendos

Why Isn't the CM4 Able to Pull the ESP32's RX Pin Down to 0V?

I kind of have an issue somewhere and I am honestly quite stumped. I designed a board using a Raspberry CM4 and an ESP32S3. The ESP32S3 has USB-PD and is powering the CM4 through it. The ESP32 board has a CP2104 USB/UART-Bridge. Both the CP2104 and Raspberry are connected to the ESP32's UART0.
DevHeads IoT Integration Server banner
DevHeads IoT Integration ServerJoin
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
2,984Members
Resources
Recent Announcements

Similar Threads

Was this page helpful?

Similar Threads

Why isn't my ESP8266 RFID Reader Providing Expected Output on the Serial Monitor?
DevHeads IoT Integration ServerDIISDevHeads IoT Integration Server / 🟩-pcb-and-analog
3y ago
Why Does My ESP32-WROVER-B Fail to Power On Intermittently?
DevHeads IoT Integration ServerDIISDevHeads IoT Integration Server / 🟩-pcb-and-analog
15mo ago
Why isn't my "Hello World" displaying on the LCD screen despite correct connections and power?
DevHeads IoT Integration ServerDIISDevHeads IoT Integration Server / 🟩-pcb-and-analog
2y ago
Can I Use a Single Pin as Both Rx and Tx on an ATtiny85 for Software Serial?
DevHeads IoT Integration ServerDIISDevHeads IoT Integration Server / 🟩-pcb-and-analog
15mo ago