Input Board ESP¶
Features¶
- Power supply 24V DC
- 35 inputs controlled by 24V DC (possibility of connecting switches, detectors, reed switches)
- Outputs (number depends on the Relay Board used)
- I²C bus (expandable with an expansion module or various types of sensors)
- 1-WIRE bus (DS18b20 temperature sensors can be connected)
- CAN bus
- RS485
- GPIO32 ESP connector (pull-up 4.7k to 3.3V)
- 3 ADC
- INA219 bidirectional current/power monitor of the board
- Ethernet 10/100Mbps
- USB-C (port designed for software uploads)
- 1.3” OLED display
- Button MENU
- Buzzer
- DIP Switch
Repository¶
Everything about this board you will find here:
https://github.com/boneIO-eu/input_board_esp/releases/tag/v0.7.0
Appearance¶
The boneio ESP controller has a housing printed on a 3D printer, the material it was printed from is PET-G. Descriptions are printed directly on case.
Documentation¶
WT32-ETH01¶
The WT32-ETH01 chip is responsible for the brain in the controller, where the ESP32 is the control processor, and the embedded Ethernet, which is controlled by the LAN8720 chip that allows the controller to connect to a LAN. With the LAN connection, the controller communicates via ESPHOME API or MQTT with a control system such as Home Assistant.
I2C bus¶
The I²C bus (bus_a) is located on pins GPIO17 (SDA) and GPIO33 (SCL). The buses operate at a frequency of 400Khz.
| I2C_bus | PINS |
|---|---|
| SDA | GPIO17 |
| SCL | GPIO33 |
I2C Devices¶
| ID | Address |
|---|---|
| INA219 | 0x40 |
| OLED | 0x3c |
| Clock RTC | 0x68 |
| MCP23017 or PCF8575 (inputs) | 0x20 |
| MCP23017 or PCF8575 (inputs) | 0x21 |
| PCF8574 (inputs) | 0x22 |
| LM75 | 0x48 |
| MCP9808 | 0x18 |
| MCP23017 or PCF8575 LEFT (outputs) | 0x23 |
| MCP23017 or PCF8575 RIGHT (outputs) | 0x24 |
| external bus | - |
INA219¶
The INA219 is a comprehensive power monitoring solution that measures with 1% accuracy and communicates digitally with the host via an I2C interface. It is capable of measuring current and voltage on the high-voltage side up to 26 V and 3.2 A. A precision current amplifier measures the voltage through a 0.1-ohm, 1% detection resistor (shunt) to determine the current flowing. The combined voltage and current measurements allow power calculation, making the INA219 ideal for tracking boneio module and power measurements.
0x401.3” OLED display¶
A module with a 1.3” OLED display with a resolution of 128 x 64 pixels, thanks to the SH1106 controller and communication via the I2C bus
0x3cDigital inputs¶
The operation of digital inputs is based on applying VDD voltage to the IN_1 to IN_35 pin. There is a voltage of +24V or GND on the VDD pin by setting the DIP SWITCH respectively.
Configuration of MCP23017 or PCF8575 and PCF8574 expander pins:
| Input ID | I2C Address | PIN Number for MCP23017 | PIN Number for PCF8575/PFC8574 |
|---|---|---|---|
| IN_1 | 0x20 | A0 | P0 |
| IN_2 | 0x20 | A1 | P1 |
| IN_3 | 0x20 | A2 | P2 |
| IN_4 | 0x20 | A3 | P3 |
| IN_5 | 0x20 | A4 | P4 |
| IN_6 | 0x20 | A5 | P5 |
| IN_7 | 0x20 | A6 | P6 |
| IN_8 | 0x20 | B0 | P10 |
| IN_9 | 0x20 | B1 | P11 |
| IN_10 | 0x20 | B2 | P12 |
| IN_11 | 0x20 | B3 | P13 |
| IN_12 | 0x20 | B4 | P14 |
| IN_13 | 0x20 | B5 | P15 |
| IN_14 | 0x20 | B6 | P16 |
| IN_15 | 0x21 | A0 | P0 |
| IN_16 | 0x21 | A1 | P1 |
| IN_17 | 0x21 | A2 | P2 |
| IN_18 | 0x21 | A3 | P3 |
| IN_19 | 0x21 | A4 | P4 |
| IN_20 | 0x21 | A5 | P5 |
| IN_21 | 0x21 | A6 | P6 |
| IN_22 | 0x21 | B0 | P10 |
| IN_23 | 0x21 | B1 | P11 |
| IN_24 | 0x21 | B2 | B12 |
| IN_25 | 0x21 | B3 | P13 |
| IN_26 | 0x21 | B4 | P14 |
| IN_27 | 0x21 | B5 | P15 |
| IN_28 | 0x21 | B6 | P16 |
| IN_29 | 0x22 | n/a | P_0 |
| IN_30 | 0x22 | n/a | P_1 |
| IN_31 | 0x22 | n/a | P_2 |
| IN_32 | 0x22 | n/a | P_3 |
| IN_33 | 0x22 | n/a | P_4 |
| IN_34 | 0x22 | n/a | P_5 |
| IN_35 | 0x22 | n/a | P_6 |
Pins to connect the output board¶
Pins are used to connect the lower board with relays and others.
USB-C¶
The controller uses USB/CH340 to connect to a computer and program the drivers. It uses a mini-USB connector for the more modern Type-C, and CH340C as a programmer.
Dip Switch¶
With the DIP SWITCH, you can set the control of the digital inputs. Setting pins 3 and 4 to ON and 1 and 2 to OFF sets +24V control and setting pins 1 and 2 to ON and 3 and 4 to OFF is GND control.
| Control | ON | OFF |
|---|---|---|
| +24V | 3 and 4 | 1 and 2 |
| GND | 1 and 2 | 3 and 4 |
Buzzer¶
The high-pitched buzzer is very useful, as it is possible to notify users of various events easily and with the standard controller tools.
MENU Button¶
The MENU button is used to operate the OLED display and check the controller’s parameters.
The button is located on the i2c_a bus from the PCF8574 on pin P_7
Analog Inputs¶
Boneio input board has 3 analog inputs, two voltage divider available.
| Input Name | GPIO Number | Voltage |
|---|---|---|
| A_1 | GPIO39 | 0 - 5V |
| A_2 | GPIO36 | 0 - 10V |
| A_3 | GPIO35 | 0 - 25V |
External GPIO pin¶
External GPIO pin to which you can connect e.g. WS2812, WS2815 or others
1-Wire¶
The 1-WIRE bus is suitable for DS18b20 temperature sensors.
RS485¶
With RS485, you can connect various devices over modbus protocol, such as energy meters or other.
| UART | GPIO |
|---|---|
| TXD | GPIO14 |
| RXD | GPIO15 |
CAN bus¶
With the CAN bus, various devices can be connected through the protocol.
| UART | GPIO |
|---|---|
| TXD | GPIO5 |
| RXD | GPIO4 |
Schematic and PCB¶
The schematic and PCB image can be downloaded github :
https://github.com/boneIO-eu/input_board_esp
Example configuration¶
A sample configuration of the fixture can be downloaded on Github. There is easy installer available for boneIO ESP boards: https://boneio.eu/esp