2 layers127 × 90 mm
Radio usb
SP8EBC/radio-usb-interface
USB <--> Land Mobile Radio interace with full ground isolation on 2way audio and PTT control
225 parts3
2 layers90 × 89.5 mm
ESP Relay Controller DC
holubets/ESP_DC_Relay_ControllerESP DC Relay Controller PCB
- Size
- 90 × 89.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 55
- Pads
- 182
- Tracks, vias
- 265, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Sep 2025
- Updated
- 25 Sep 2025
Overview
ESP Relay Controller DC is an open-source printed circuit board by holubets, from the holubets/ESP_DC_Relay_Controller repository on GitHub. It is a 2-layer board of 90 × 89.5 mm with 66 parts on 55 nets, routed with 265 tracks and 0 vias.
It is built around the MAX485ED, WEMOS D1 MINI and 15EDGRC-3.5-03P-14, with the SRD-05VDC-SL-C and SS8050 among its other parts. Its parts include 27 resistors, 12 connectors, 9 diodes, 6 ICs and 4 transistors. It belongs with the home automation and IoT boards and the ESP8266 boards of this library.
Main components
5
MAX485ED
SOP-8-40℃~+85℃ 1 1 1mA 32 4.75V~5.25V 5Mbps Half-Duplex Transceiver ±8kV SOP-8 RS-485 / RS-422 ICs ROHSHTCRS-485 / RS-422 ICs
WEMOS D1 MINI
A mini wifi board with 4MB flash based on ESP-8266EX, hardware version 4.0.0.LolinUncategorised15EDGRC-3.5-03P-14
TH-3P,P=3.5mmTH-3P,P=3.5mm New Arrivals ROHSDEGSONUncategorised
SRD-05VDC-SL-C
插件,19.2x15.6mm100mΩ 10ms 10ms 15A 250V@AC 360mW 5 5V 70Ω Non-Polarized - Single Coil One set changeover: 1C (SPDT - changeover) 插件,19.2x15.6mm Power Relays ROHS松乐Power Relays
SS8050
SOT-323-55℃~+150℃ 1 NPN 1.5A 100MHz 100nA 200 25V 300mW 500mV 5V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 10K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4, R8, R9, R10, R11, R12, R20, R26 |
| 8 | 1K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R13, R14, R15, R16, R22, R23, R24, R25 |
| 6 | 15EDGRC-3.5-03P-14 | DEGSON:15EDGRC-3.5-03P-14 | J1, J2, J3, J4, J5, J6 |
| 5 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2, D3, D4, D5 |
| 4 | , , , | ||
| 4 | 0 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R17, R18, R19, R27 |
| 4 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D7, D8, D9, D10 |
| 4 | DG306-5.0-03P-12-00A_H_ | DEGSON:DEGSON_DG306-5.0-03P-12-00A_H_ | P2, P3, P4, P5 |
| 4 | PC817 | Package_DIP:DIP-4_W7.62mm | U3, U4, U5, U6 |
| 4 | SRD-05VDC-SL-C | SRD-05VDC-SL-C:SRD-05VDC-SL-C | K1, K2, K3, K4 |
| 4 | SS8050 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4 |
| 2 | 20K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R6 |
| 1 | 120 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R7 |
| 1 | 470 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R21 |
| 1 | DG306-5.0-02P-12-00A_H_ | DEGSON:DEGSON_DG306-5.0-02P-12-00A_H_ | P1 |
| 1 | MAX485E | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | Socket_2P | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J7 |
| 1 | WEMOS_D1_mini | RF_Module:WEMOS_D1_mini_light | U1 |
Questions
How big is the ESP Relay Controller DC PCB?
It measures 90 × 89.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ESP Relay Controller DC use?
66 parts, built around the MAX485ED, WEMOS D1 MINI, 15EDGRC-3.5-03P-14 and SRD-05VDC-SL-C. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the ESP Relay Controller DC KiCad files?
From the holubets/ESP_DC_Relay_Controller repository on GitHub, at the commit this page was made from: the board is ESP Relay Controller-DC.kicad_pcb and its schematic ESP Relay Controller-DC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ESP Relay Controller DC design in my own project?
Its repository states no licence, so its author keeps all rights: ask holubets before reusing the design.
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