Is a bespoke electronic control box manufactured for Stokes Industries for use in industrial automation projects.
Images
Specifications
- 1x Removable Raspberry Pi Pico W (RP2040)
- 1x 24VDC input (main power) protected by a 5x20mm 1.6A fuse
- 1x 5VDC output
- 16x discrete Inputs via I2C PCF8574 I/O expander
- 8x Outputs using C-Form Contacts controlled through GPIO
- 1x UART serial/analog I/O through GPIO
- 1x SSD1305 display via I2C
- 1x Housing with clear plastic cover
- Outside: 235mm long x 200mm wide x 105mm deep
- Milled opening: 140mm long x 30mm wide
- Mounting holes: 210mm long x 175mm wide
Discrete Inputs
Terminals D01-D16 are mapped through two Texas Instruments PCF8574 operating at 3 volts connected to the PICO GPIO pins 04 (SDA) and 05 (SCL) using the I2C protocol via the i2c0 PICO controller.
| PCB Label | I2C Address | I2C Pin # |
| D01 | 0x20 | 3 |
| D02 | 0x20 | 4 |
| D03 | 0x20 | 7 |
| D04 | 0x20 | 8 |
| D05 | 0x21 | 3 |
| D06 | 0x21 | 4 |
| D07 | 0x21 | 7 |
| D08 | 0x21 | 8 |
| D09 | 0x20 | 2 |
| D10 | 0x20 | 5 |
| D11 | 0x20 | 6 |
| D12 | 0x20 | 1 |
| D13 | 0x21 | 2 |
| D14 | 0x21 | 5 |
| D15 | 0x21 | 6 |
| D16 | 0x21 | 1 |
Discrete Outputs
Terminals C01-C08 are C-Form Contacts rated at
| Amps | VAC |
| 5 | 250 |
| 10 | 120 |
| 10 | 277 |
Coils C01-C08 are mapped directly to PICO GPIO pins:
| PCB Label | GPIO # |
| C1 | 11 |
| C2 | 10 |
| C3 | 09 |
| C4 | 08 |
| C5 | 07 |
| C6 | 06 |
| C7 | 01 |
| C8 | 00 |
Analog/Serial I/O
Analog/Serial I/O (UART) is available through GPIO 16 (TX) and 17 (RX) via PICO uart0 controller.
OLED Display
The unit has one I2C SSD1306 OLED display at address 0x3C operating at 3 volts connected to the PICO GPIO pins 04 (SDA) and 05 (SCL) using the I2C protocol via the i2c0 PICO controller.
Revision History
Rev 1.0
* Initial product.
Rev 1.1
* Modified C-Form contact control from PCF8574 directly to PICO GPIO.
Rev 1.2
* Added 5VDC output (sourced from 24VDC input).
* Added Analog/Serial I/O (UART) support.
Dimensions