▲ 1 r/esp32
ESP32 LAN8720
Hi everyone, I’m working on a university robotics project. My robot uses an ESP32 with a LAN8720 Ethernet module. Right now I’m just trying to test the LAN8720 connection.
When I power on the ESP32, Serial Monitor shows the error in image. here is the code that i use
/*
This sketch shows the Ethernet event usage
*/
// Important to be defined BEFORE including ETH.h for ETH.begin() to work.
// Example RMII LAN8720 (Olimex, etc.)
#ifndef ETH_PHY_MDC
#define ETH_PHY_TYPE ETH_PHY_LAN8720
#if CONFIG_IDF_TARGET_ESP32
#define ETH_PHY_ADDR 0
#define ETH_PHY_MDC 23
#define ETH_PHY_MDIO 18
#define ETH_PHY_POWER -1
#define ETH_CLK_MODE ETH_CLOCK_GPIO0_IN
#elif CONFIG_IDF_TARGET_ESP32P4
#define ETH_PHY_ADDR 0
#define ETH_PHY_MDC 31
#define ETH_PHY_MDIO 52
#define ETH_PHY_POWER 51
#define ETH_CLK_MODE EMAC_CLK_EXT_IN
#endif
#endif
#include <ETH.h>
static bool eth_connected = false;
// WARNING: onEvent is called from a separate FreeRTOS task (thread)!
void onEvent(arduino_event_id_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
// The hostname must be set after the interface is started, but needs
// to be set before DHCP, so set it from the event handler thread.
ETH.setHostname("esp32-ethernet");
break;
case ARDUINO_EVENT_ETH_CONNECTED: Serial.println("ETH Connected"); break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.println("ETH Got IP");
Serial.println(ETH);
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_LOST_IP:
Serial.println("ETH Lost IP");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default: break;
}
}
void testClient(const char *host, uint16_t port) {
Serial.print("\nconnecting to ");
Serial.println(host);
NetworkClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
return;
}
client.printf("GET / HTTP/1.1\r\nHost: %s\r\n\r\n", host);
while (client.connected() && !client.available());
while (client.available()) {
Serial.write(client.read());
}
Serial.println("closing connection\n");
client.stop();
}
void setup() {
Serial.begin(115200);
Network.onEvent(onEvent);
IPAddress local_IP(192, 168, 1, 50);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
ETH.config(local_IP, gateway, subnet);
ETH.begin();
}
void loop() {
if (eth_connected) {
Serial.println("Ethernet is working");;
}
delay(10000);
}
I'm planning a sewer inspection robot using three ESP32 boards—one with a LAN8720 for Ethernet communication to a laptop, one to control motors, and one to read multiple sensors, all ESP32s communicating via UART, with sensor data and status sent to a webpage hosted on the ESP32, and I’m wondering if this setup is feasible, and if anyone has suggestions for making the communication and integration more reliable?
u/Nemo-_-_ — 18 hours ago