Smart Relay Design Requirements
Worked for 37 sec
Assuming you mean LCSC: No, not all components are currently available/assigned from LCSC.
LCSC-available in current BOM
- KF128-5.08-2P-AA terminals — LCSC stock shown
- LMR16030SDDAR buck regulator — LCSC stock shown
- ESP32-S3-WROOM-1U-N16R8 — LCSC stock shown
- AP2112K-3.3TRG1 — LCSC stock shown
- TPS2051CDBVR — LCSC stock shown, but wrong for requirement because it is 0.5 A class and USB host target is 1 A
- STTH212S diode — LCSC stock shown
- SMBJ30CA TVS — LCSC part metadata present
- ISO6741 digital isolator — no LCSC SKU/stock shown
- ISO1212 isolated DI receivers — no LCSC SKU/stock shown
- ISOW1044 isolated CAN transceiver — no LCSC SKU/stock shown
- AD7329 ADC — no LCSC SKU/stock shown
- JQC-3F-1C-24VDC relay — no LCSC SKU/stock shown
- USB4105-GF-A USB-C connector — LCSC stock shown as 0
- ULN2003A — LCSC stock shown as 0 for current selected part
- Generic resistors/capacitors/inductor — not assigned to specific LCSC MPNs yet
- Solenoid FET Driver 3.3V blocks — not production BOM-ready as discrete LCSC parts
So the design is not yet LCSC/JLCPCB procurement-ready. Next step should be a sourcing pass to replace/assign LCSC-stocked MPNs for the unavailable ICs, relay, USB connector, passives, inductor, and 1 A USB power switch.
Run sourcing pass
Fix USB switch
Assign passives
Resolve production risks
Check relay options
Refine this doc
Ask about this doc
Firmware Starter — ESP32-S3 Smart Relay
Platform
- Framework: Arduino on PlatformIO
- MCU: ESP32-S3-WROOM-1U-N16R8
Pin Mapping
Table
| Function | GPIO |
|---|---|
| USB D- | GPIO19 |
| USB D+ | GPIO20 |
| CAN TX | GPIO17 |
| CAN RX | GPIO18 |
| DI1..DI4 | GPIO4, GPIO5, GPIO6, GPIO7 |
| DO1..DO4 relay drivers | GPIO8, GPIO9, GPIO10, GPIO11 |
| ADC SPI SCLK/MOSI/CS/MISO | GPIO12, GPIO13, GPIO14, GPIO15 |
platformio.ini
Ini
[env:esp32-s3-devkitc-1] platform = espressif32 board = esp32-s3-devkitc-1 framework = arduino monitor_speed = 115200 build_flags = -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=1
src/main.cpp
Cpp
#include <Arduino.h> #include <SPI.h> #define PIN_DI1 4 #define PIN_DI2 5 #define PIN_DI3 6 #define PIN_DI4 7 #define PIN_DO1 8 #define PIN_DO2 9 #define PIN_DO3 10 #define PIN_DO4 11 #define PIN_AI_SCLK 12 #define PIN_AI_MOSI 13 #define PIN_AI_CS 14 #define PIN_AI_MISO 15 #define PIN_CAN_TX 17 #define PIN_CAN_RX 18 SPIClass aiSpi(FSPI); static uint16_t readAd7329Raw(uint8_t channel) { uint16_t command = 0x8000 | ((channel & 0x07) << 10); digitalWrite(PIN_AI_CS, LOW); uint16_t result = aiSpi.transfer16(command); digitalWrite(PIN_AI_CS, HIGH); return result & 0x0FFF; } static void setRelay(uint8_t index, bool on) { const uint8_t pins[] = {PIN_DO1, PIN_DO2, PIN_DO3, PIN_DO4}; if (index < 4) digitalWrite(pins[index], on ? HIGH : LOW); } void setup() { Serial.begin(115200); delay(500); Serial.println("ESP32-S3 Smart Relay starting"); pinMode(PIN_DI1, INPUT); pinMode(PIN_DI2, INPUT); pinMode(PIN_DI3, INPUT); pinMode(PIN_DI4, INPUT); pinMode(PIN_DO1, OUTPUT); pinMode(PIN_DO2, OUTPUT); pinMode(PIN_DO3, OUTPUT); pinMode(PIN_DO4, OUTPUT); setRelay(0, false); setRelay(1, false); setRelay(2, false); setRelay(3, false); pinMode(PIN_AI_CS, OUTPUT); digitalWrite(PIN_AI_CS, HIGH); aiSpi.begin(PIN_AI_SCLK, PIN_AI_MISO, PIN_AI_MOSI, PIN_AI_CS); } void loop() { bool di[4] = {digitalRead(PIN_DI1), digitalRead(PIN_DI2), digitalRead(PIN_DI3), digitalRead(PIN_DI4)}; for (int i = 0; i < 4; ++i) setRelay(i, di[i]); uint16_t ai0 = readAd7329Raw(0); uint16_t ai1 = readAd7329Raw(1); uint16_t ai2 = readAd7329Raw(2); uint16_t ai3 = readAd7329Raw(3); Serial.printf("DI=%d%d%d%d AI=%u,%u,%u,%u\n", di[0], di[1], di[2], di[3], ai0, ai1, ai2, ai3); delay(100); }
Notes
- Relay GPIOs drive ULN2003A inputs; HIGH energizes the corresponding relay coil.
- ADC scaling/calibration constants must be finalized after the analog front-end protection/divider BOM is locked.
- CAN driver setup should be added after the final ESP32 TWAI/CAN stack choice is selected.
Platform
Pin Mapping
platformio.ini
src/main.cpp
Notes
