ESP32-S3 Firmware for a Wi-Fi Gate Intercom
Firmware that turns an ESP32-S3 board into a Wi-Fi gate intercom with SIP/VoIP calling.
- Industry
- Gate automation
- Microcontroller
- ESP32-S3 (ESP32-S3-CAM)
- SDK
- ESP-IDF
- Language
- C/C++
- Connectivity
- Wi-Fi · TTL serial
What the client needed.
A manufacturer of gate automation and telemetry products had ESP32-S3-CAM hardware and needed custom firmware to make it a working connected product.
The device had to join Wi-Fi, take its configuration and report its status over a serial link, and handle two-way voice calls over SIP/VoIP through a small speaker, all on one microcontroller.
Network, audio and configuration on one chip.
ESP-IDF firmware on the ESP32-S3 runs the Wi-Fi connection, a SIP/VoIP audio path with echo cancellation, and a serial command interface used for configuration and status.
- 01ESP32-S3-CAM boardClient hardware
- 02ESP-IDF firmwareC/C++
- 03Wi-FiNetwork configuration
- 04SIP/VoIP audioCalls · echo cancellation
- 05TTL serial interfaceConfiguration · status commands
- 06ConfigGate toolDevice configuration
The decisions that made it work.
- 1
ESP-IDF, as the client required
We built on Espressif's native framework instead of a higher-level one, which gives full control of Wi-Fi, audio and memory on the ESP32-S3.
- 2
Configuration over serial
Wi-Fi and SIP settings and status checks go through a TTL serial command interface, so units can be configured with a simple USB-to-TTL adapter.
- 3
Echo cancellation in firmware
With the speaker and microphone close together in a gate unit, the audio pipeline cancels echo so calls stay clear.
- 4
Phased workstreams
The firmware was developed in phases alongside the client's wider product portfolio.
What the client got.
- custom ESP-IDF firmware in C/C++
- ESP32-S3
- voice calls over Wi-Fi from the device
- SIP/VoIP
- configuration and status from a simple adapter
- Serial
- ESP32-S3
- ESP-IDF
- C/C++
- Wi-Fi
- SIP/VoIP
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