2 layers40.5 × 56 mm
2 layers40.5 × 56 mm
- Size
- 40.5 × 56 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 28
- Nets
- 26
- Pads
- 160
- Tracks, vias
- 266, 46
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20200819)
- Created
- 24 Aug 2020
- Updated
- 19 Jun 2021
Overview
E28 tx is an open-source printed circuit board by R4ynor, from the R4ynor/ExpressLRS_HW_stuff repository on GitHub. It is a 2-layer board of 40.5 × 56 mm with 28 parts on 26 nets, routed with 266 tracks and 46 vias.
It is built around the E28-2G4M27S, CH340C and ESP32-WROOM-32D, with the ME6211C33R5G and BC847BS among its other parts. Its parts include 11 capacitors, 5 ICs, 4 connectors, 2 switches and 1 resistor. It belongs with the ESP32 boards of this library.
Main components
5
E28-2G4M27S
SMD,26.5x15mm-132dBm 14.5mA 2.5V~3.6V 27dBm 580mA 8km IPEX interface、On-board PCB Antenna LoRa、GFSK、FLRC RTToF ranging SPI SMD,26.5x15mm LoRa Modules ROHSChengdu Ebyte Elec TechLoRa Modules
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
ESP32-WROOM-32D
-- WiFi Modules ROHSEspressif SystemsWiFi Modules
ME6211C33R5G
SOT-353-40℃~+150℃ 1 120mV@(100mA) 3.3V 30uA 500mA 50uVrms 6V 70dB@(1kHz) Enable、Short Circuit Protection Fixed Positive SOT-353 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMICRONEVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BC847BS
SOT-363Bipolar (BJT)hongjiacheng
README
min_sx1280/README.mdMini 2.4GHz RX
This is a sx1280 receiver intended to be easier to solder with only an iron.
BOM
https://docs.google.com/spreadsheets/d/1p7ZbwzJ3oUK5TnewW_nvrkTnwwBvXO2xWFpPxcCNbLk/edit?usp=sharing
Build tip
Solder C3, C5 and R3 before the ESP-01F.
Parts
28| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C2, C4, C7, C9, C11 |
| 4 | 10uF | Capacitor_Tantalum_SMD:CP_EIA-1608-08_AVX-J_Pad1.25x1.05mm_HandSolder | C1, C6, C8, C10 |
| 2 | 2.2uF | Capacitor_Tantalum_SMD:CP_EIA-1608-08_AVX-J_Pad1.25x1.05mm_HandSolder | C3, C5 |
| 2 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3, J4 |
| 2 | E28-2G4M27S | ELRS_lib:E28-2G4M27S | U4, U5 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_TL3342 | SW1, SW2 |
| 1 | 10K | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1 |
| 1 | B5918 | Diode_SMD:D_SOD-323_HandSoldering | D1 |
| 1 | BC847BS | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q1 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | Conn_01x05 | ELRS_lib:MOLEX_0022142054 | J2 |
| 1 | ESP32-WROOM-32D | RF_Module:ESP32-WROOM-32 | U3 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Wuerth_614105150721_Vertical | J1 |
| 1 | me6211c33 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
The 25 most common of 28 parts.
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Questions
How big is the E28 tx PCB?
It measures 40.5 × 56 mm and has 2 copper layers, 0.8 mm thick.
What parts does the E28 tx use?
28 parts, built around the E28-2G4M27S, CH340C, ESP32-WROOM-32D and ME6211C33R5G. 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 E28 tx KiCad files?
From the R4ynor/ExpressLRS_HW_stuff repository on GitHub, at the commit this page was made from: the board is e28_dual_tx/e28_tx.kicad_pcb and its schematic 20x20_sx1280/20x20_sx1280.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the E28 tx design in my own project?
Its repository states no licence, so its author keeps all rights: ask R4ynor before reusing the design.