These are the building instructions for a low-cost extension module designed for ESP32 development boards. The module simplifies the process of connecting inputs and outputs to a board, while also enabling user interaction through push buttons and displaying information via low-power OLED display.
| # | Name | Description |
|---|---|---|
| 1+2 | Tactile switch (SMD) | RACON 12 S, THT, 12x12 mm |
| 3 | OLED-Display SSD1306 | I²C OLED Display 0,96”, 128x64 px, SSD1306 controller, I²C connection, 5V |
| 4+5 | Socket strip | 30 pins, double rows, pin length 3.5mm, max. 5A |
| 6 | Stripboard 70x50 mm | Epoxyd FR4 PCB with double-sided dot matrix and solder resist, grid spacing: 2.54 mm |
| 7 | Jumper wire | Wire for connections (ø 0,5 mm) |
| Name | Soldering connections | Wire connections |
|---|---|---|
| Tactile switch 1 | B2 (OUT) D2 (GND) B6 (OUT) D6 (GND) |
B6 -> L9 D6 -> I6 |
| Tactile switch 2 | G2 (OUT) I2 (GND) G6 (OUT) I6 (GND) |
G6 -> L10 I2 -> W4 |
| OLED display | D17 (OUT) E17 (VCC) F17 (SCL) G17 (SDA) |
D17 -> I2 E17 -> L3 F17 -> W16 G17 -> W13 |
| Socket strip 1 | L3 to L17 M3 to M17 |
see above |
| Socket strip 2 | W3 to W17 X3 to X17 |
see above |
The module works with 30-pin variants of development boards that are based on the popular ESP32-DevKitC platform.
Vector images for laser cutting a protective case out of 3 mm High-Density-Fiberboard (HDF) can be found inside the case images folder.
HACKADAY
Resources for hardware hacking
https://hackaday.io/discover
WOKWI
Simulate IOT projects in your browser (/w ESP32 support)
https://www.wokwi.com
The ESP Journal
Best Practices, Articles, and Notes from Espressif
https://blog.espressif.com
How To Solder – For DIY Guitar Pedals, Synth, and Other Hobby Electronics
Mark A. Stratman (MAS Effects)
https://masfx.io/how-to-solder.pdf
Soldering Electronic Connections
NASA Technical Standards Coordinator, Washington DC
https://nepp.nasa.gov/docuploads/06AA01BA-FC7E-4094-AE829CE371A7B05D/NASA-STD-8739.3.pdf