Electra
About the Electra PCB
Electra is an open source ESP8266 PCB design by Grehasopt, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 100 × 48.5 mm, with 58 components from 39 distinct parts.
Its main chip is the ESP-12F, from the ESP8266 family. Other key parts include the AMS1117-5.0 and AMS1117-3.3. By type, the board carries 19 resistors, 13 connectors, 10 diodes, 7 capacitors, 3 ICs and 2 transistors.
From the project
Remote Relays Board
Main components on the Electra
Electra bill of materials (BOM)
58 components, 39 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AMS1117-5.0 | SOT-223-3_TabPin2 | U201 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U202 |
| 1 | ESP-12F | ESP-12E | U501 |
| 2 | Q_NPN_EBC | SOT-323_SC-70 | Q301, Q801 |
| 1 | Extra1 | PinHeader_1x03_P2.54mm_Vertical | J101 |
| 1 | RTC | PinHeader_1x06_P2.54mm_Vertical | J102 |
| 1 | Extra2 | PinHeader_1x03_P2.54mm_Vertical | J103 |
| 1 | UART | PinHeader_1x04_P2.54mm_Vertical | J104 |
| 1 | USB | USB_Micro-B_Molex-105017-0001 | J201 |
| 1 | 7-12V | BarrelJack_Horizontal | J202 |
| 1 | Relay 2/D | TerminalBlock_bornier-3_P5.08mm | J301 |
| 1 | S1/U | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J401 |
| 1 | S2/D | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J402 |
| 1 | A | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J601 |
| 1 | A2 | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J602 |
| 1 | RF433 | PinHeader_1x04_P2.54mm_Vertical | J701 |
| 1 | Relay 1/U | TerminalBlock_bornier-3_P5.08mm | J801 |
| 2 | FINDER-36.11 | Relay_SPDT_Finder_36.11 | K301, K801 |
| 1 | Flash | SW_SPST_CK_RS282G05A3 | SW501 |
| 1 | RST | SW_SPST_CK_RS282G05A3 | SW502 |
Show 19 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 1A | D_SMA_Handsoldering | D201, D202, D203 |
| 1 | PWR | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D204 |
| 1 | R2 | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D301 |
| 2 | 200mA | D_MiniMELF | D302, D802 |
| 1 | TX | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D501 |
| 1 | RX | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D502 |
| 1 | R1 | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D801 |
| 3 | 100uF | CP_Elec_6.3x5.4 | C201, C204, C205 |
| 2 | 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C202, C203 |
| 1 | 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C501 |
| 1 | 47uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C502 |
| 1 | 82 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R201 |
| 4 | 1K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R301, R603, R701, R801 |
| 2 | 68 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R302, R802 |
| 7 | 10K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R401, R402, R501, R502, R503, R505, R506 |
| 2 | 15 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R504, R507 |
| 1 | 3.3K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R601 |
| 1 | 7.5K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R602 |
| 1 | 2K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R702 |
Electra design files
The KiCad project lives in the Grehasopt/Electra-pcb repository on GitHub; these links point at the commit this page was built from.
Electra: common questions
What microcontroller does the Electra use?
The Electra is built around the ESP-12F, from the ESP8266 family.
How big is the Electra PCB?
The Electra measures 100 × 48.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Electra?
58 components, from 39 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Electra design files?
From the Grehasopt/Electra-pcb repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Electra design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which Grehasopt chose for the repository.
Can I test firmware for the Electra without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.
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