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Water Motor Controller - Twin Node
Project Description
The TWIN-NODE Motor Controller is a compact, wireless motor control PCB designed for reliable water pump automation. It uses an ESP8266 (ESP-01) module with ESP-NOW communication, enabling fast, peer-to-peer control without internet dependency. The board is intended for real-world deployment and easy manufacturing.
To ensure electrical safety and robustness, the design incorporates a 35A rated relay supported by a fuse and varistor on the high-voltage side. The fuse provides over-current protection, while the varistor suppresses voltage surges caused by inductive motor loads, significantly improving system reliability and lifespan.
On the control side, a MOSFET-based driver stage is used to switch the relay efficiently from the microcontroller GPIO. This approach reduces stress on the ESP8266, improves switching performance, and ensures stable operation under continuous use. The PCB layout is optimized for isolation, safety, and manufacturability.
#include <ESP8266WiFi.h>
#include <espnow.h>
#define RELAY_PIN 0 // GPIO0 (change if your relay is on another pin)
// Structure for incoming data
typedef struct struct_message {
uint8_t relayState;
} struct_message;
struct_message incomingData;
// Callback when data is received
void onDataRecv(uint8_t *mac, uint8_t *incomingDataRaw, uint8_t len) {
memcpy(&incomingData, incomingDataRaw, sizeof(incomingData));
if (incomingData.relayState == 1) {
digitalWrite(RELAY_PIN, HIGH); // Relay ON
} else {
digitalWrite(RELAY_PIN, LOW); // Relay OFF
}
}
void setup() {
pinMode(RELAY_PIN, OUTPUT);
digitalWrite(RELAY_PIN, LOW); // Relay OFF at startup
WiFi.mode(WIFI_STA);
WiFi.disconnect();
if (esp_now_init() != 0) {
return; // ESP-NOW init failed
}
esp_now_set_self_role(ESP_NOW_ROLE_SLAVE);
esp_now_register_recv_cb(onDataRecv);
}
void loop() {
// Nothing required here
}
Water Motor Controller - Twin Node
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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