JetHub E1-PD76-R5-DC Microcontroller (v2)

Hint

The controller can be purchased from the manufacturer’s website: http://jethome.ru/e1/

General Description

The JetHub E1-PD76-R5-DC (v2) controller is designed to control power loads in home automation systems. It contains five power relays, six dry contact digital inputs and a 1-Wire sensor input.

The functionality of the controller depends entirely on the software (firmware) installed by the user.

The DIN-rail enclosure design allows the controller to be conveniently placed in the electrical panel of the house.

Features

  • Microcontroller ESP32-D0WDQ6.

  • The microcontroller frequency is up to 240MHz.

  • SPI flash of 4 MBytes.

  • Built-in RAM of 520 KBytes.

Design

../../../_images/e1_pd76_r5_v2_info_drawing.png

On the top side of the controller are:

  1. Toggle relay terminal 1

  2. Relay terminal 2

  3. Relay terminal 3

  4. Relay terminal 4

  5. Relay terminal 5

On the front side of the controller there are indication and control elements:

  1. Dual-color custom LED (STAT)

  2. Power supply indication LED (PWR)

  3. User button

On the underside of the controller are:

  1. Ethernet RJ45 connector

  2. Discrete input terminal 4-5

  3. Discrete inputs terminal 1-3

  4. 1-Wire terminal

  5. 12-48V DC power terminal

On the front panel of the controller there are also:

  1. MicroUSB connector

  2. Internal hardware reset button (RESET)

Dimensions and weight

  • Enclosure dimensions: 130 x 76 x 57 mm.

  • Enclosure width is 76mm, which is about 4.3 standard modules for a DIN rail (17.5mm).

  • Ability to mount the enclosure to a DIN rail 35mm.

  • Weight: 250 g

Revisions

Processor module revisions

  • v1.2

    • Added possibility to reset controller hardware through internal processor module button (accessible through a hole in the housing)

  • v1.1

    • Initial Version

Motherboard revisions

  • v2.0

    • Added terminal for connection of 1-Wire sensors. Two versions: DC and AC power supply.

Interfaces

Wi-Fi/Bluetooth

  • Wi-Fi 802.11b/g/n (2.4 GHz() up to *150 Mbps.

  • Bluetooth v4.2 BR/EDR with support for BLE specification.

Ethernet

The built-in ESP32 IEEE-802.3-compliant MAC microcontroller is used.

The chip used as the Ethernet PHY is LAN8720A connected via the RMII interface.

Main characteristics PHY

  • The processor module has a PHY connection option without using an additional quartz resonator or oscillator.

  • The clock pulses with a frequency of 50 MHz are generated by the ESP32 microcontroller itself.

Wiring diagram

The Ethernet PHY chip is connected to the following pins of the ESP32 microcontroller:

ESP32 output

Function

IO25

ETH_RXD0

IO26

ETH_RXD1

IO27

ETH_CRS_DV

IO19

ETH_TXD0

IO22

ETH_TXD1

IO21

ETH_TXDEN

IO23

ETH_MDC

IO18

ETH_MDIO

IO17

50MHZ CLK OUT

External periphery

LEDs and buttons

There are LEDs and buttons on the processor module:

  • Power indicator - green LED PWR.

  • Two LEDs (green and red) STAT controlled from the GPIO port expander chip.

  • The main user button FUNC.

  • Optional additional internal user button USER (depending on the revision of the processor module E1-CPU).

Note

The function of the LEDs STAT and the button FUNC during the controller operation is determined by the installed software.

  • The LEDs are connected to the GPIO port expander:

    • The red LED is connected to pin 0 of the expander,

    • зеленый светодиод - к выводу 1 расширителя.

    The LED control logic is inverse: the LED is turned on by writing the logic 0 to the expander port.

  • The button FUNC is connected directly to the pin IO0 ESP32. The logic of the button is inverse: when the button is closed, the input of the microcontroller will have the level of logic 0.

    Note

    Holding down the FUNC button when turning on the power, puts the controller in the firmware mode.

  • The optional user button USER is connected to the GPIO port expander on the port 2. The logic of the button is inverse.

Relay

The controller contains 5 relays with the following characteristics:

  • Maximum switchable current - 16A

  • Maximum switched - 250V AC.

  • Galvanic isolation between relay contacts - 1000V.

Warning

The relays are not protected against overloading and overheating. The relays and controller may be damaged if they are over rated.

Relay outputs:

  • The relay 1 has the output type Changeover contact and is led to a three-pin screw terminal with pin spacing 5mm

  • The relays 2-5 are of the output type NO contact and are terminated on two-pin screw terminals with pin spacing 5mm.

Discrete inputs

The controller contains 6 digital inputs type Dry Contact, brought out to two external four-pin screw terminals with contact spacing of 3.5mm.

The binary input must be shorted to the common contact GND.

Warning

Be careful when connecting the digital inputs. Do not allow voltage to be applied to the digital inputs, there are pull-up resistors to 5V on the board.

The inner periphery

Real Time Clock (RTC)

The processor module has a real-time clock chip PCF8563 (or analog).

The chip is connected to the internal I2C bus of the module. The address of the chip on the I2C bus is 0x51.

To power the RTC, install a 3V battery of the CR1220 form factor.

I2C bus

The I2C bus is used to connect various peripheral devices and is routed to the following pins of the microcontroller:

ESP32 output

Destination

IO4

I2C SCL

IO5

I2C SDA

Recommended bus frequency: 100kHz (Standard mode) or 400kHz (Fast mode). These modes are supported by most peripheral chips.

The I2C bus is also terminated on a 40-pin expansion slot and is used to connect external peripherals.

EEPROM

The processor module has a non-volatile EEPROM memory chip AT24C64 (or equivalent) of 64Kbit (8 KBytes).

The purpose of this memory is to store the hardware configuration of the board or the current state of the controller.

The address of the memory chip on the I2C bus is 0x54.

JTAG

There are pads on the processor module to connect the JTAG connector.

The JTAG connector pin assignment is standard for a ARM 10-pin connector.

Pin assignment

Below is the pin assignment of the JTAG connector of the CPU module and its connection to the debugger CJMCU-232H:

Conclusion

Destination

ESP32 output

Debugger

1

+3.3V

2

TMS

IO14

AD3

3

GND

4

TCK

IO13

AD0

5

GND

6

TDO

IO15

AD2

7

N.C.

8

TDI

IO12

AD1

9

GND

GND

10

EN

GPIO port expander

To increase the number of GPIO ports of the processor module, the module has a GPIO port expander chip PCF8575 connected to the I2C bus.

The address on the I2C bus is 0x20.

Expander ports in use

Channel

Function

Description

0

RED_LED

Red status LED on the controller front panel

1

GREEN_LED

Green status LED on the controller front panel

2

USER_BUTTON.

Optional internal user button

3

4

5

6

7

8

GPIO5

Input/Output. 40-pin connector output

9

GPIO6

Input/Output. 40-pin connector output

10

GPIO7

Input/Output. 40-pin connector output

11

GPIO8

Input/Output. 40-pin connector output

12

GPIO9

Input/Output. 40-pin connector output

13

GPIO10

Input/Output. 40-pin connector output

14

GPIO11

Input/Output. 40-pin connector output

15

Internal connectors

ESP32-WROOM-32 module outputs

Pin assignment of the ESP32-WROOM-32 module on the E1-CPU processor module

Conclusion

ESP32

Destination

Description

1

GND

General.

2

3.3V

Module Power.

3

EN

Hardware reset of the module.

4

I36

GPI3

Interrupt input from the GPIO port expander of the CPU module. Output to the peripheral connector.

5

I39

UART2_RX

The RX line of the UART2 port. It is connected to the peripheral connector.

6

I34

UART1_RX

The RX line of the UART1 port. It is connected to the peripheral connector.

7

I35

GPI4

Input. Output to the peripheral connector.

8

IO32

GPIO1

Input/Output. Brought out to the peripheral connector. Reserved for CAN_TXD.

9

IO33

UART1_TX

TX line of the UART1 port. It is connected to the peripheral connector.

10

IO25

ETHERNET_RXD0

Connecting an external Ethernet PHY.

11

IO26

ETHERNET_RXD1

Connecting an external Ethernet PHY.

12

IO27

ETHERNET_CRS_DV

Connecting an external Ethernet PHY.

13

IO14

SPI_CLK/JTAG_TMS

SPI_CLK line. It is connected to the peripheral connector and the JTAG connector.

14

IO12

SPI_MISO/JTAG_TDI

SPI_MISO line. It is connected to the peripheral connector and the JTAG connector.

15

GND

General.

16

IO13

SPI_MOSI/JTAG_TCK

SPI_MOSI line. It is connected to the peripheral connector and the JTAG connector.

17

Not used.

18

Not used.

19

Not used.

20

Not used.

21

Not used.

22

Not used.

23

IO15

GPIO2/JTAG_TDO

I/O. Brought out to the peripheral connector and the JTAG connector. Reserved for CAN_RXD.

24

IO2

UART2_TX

The RX line of the UART2 port. It is connected to the peripheral connector.

25

IO0

BUTTON

FUNC button on the front panel of the controller. It is also used to enter firmware mode when the power is turned on.

26

IO4

I2C_SCL

I2C_SCL line. Terminated on the peripheral connector.

27

IO16

GPIO0

Input/Output. Brought out to the peripheral connector. Reserved for SPI_CS.

28

IO17

ETHERNET_CLK_50M

Connecting an external Ethernet PHY.

29

IO5

I2C_SDA

I2C_SDA line. Terminated on the peripheral connector.

30

IO18

ETHERNET_MDIO

Connecting an external Ethernet PHY.

31

IO19

ETHERNET_TXD0

Connecting an external Ethernet PHY.

32

NC

Not connected.

33

IO21

ETHERNET_TXDEN

Connecting an external Ethernet PHY.

34

RXD0

UART0_RX

UART_RX line for firmware and system message output (console).

35

TXD0

UART0_TX

UART_TX line for firmware and system message output (console).

36

IO22

ETHERNET_TXD1

Connecting an external Ethernet PHY.

37

IO23

ETHERNET_MDC

Connecting an external Ethernet PHY.

38

GND

40-pin connector on the processor board

Pin assignment of 40-pin connector of E1-CPU processor module

Contact

Title

Purpose of the E1-CPU

1

+5.0V

The processor module power supply is +5V.

2

+5.0V

The processor module power supply is +5V.

3

GND

General.

4

GND

General.

5

ETH_TXN

Connecting an external transformer to the Ethernet PHY.

6

ETH_TXP

Connecting an external transformer to the Ethernet PHY.

7

ETH_RXN

Connecting an external transformer to the Ethernet PHY.

8

ETH_RXP

Connecting an external transformer to the Ethernet PHY.

9

ETH_LED1

Connecting an external LED to the Ethernet PHY.

10

ETH_LED0

Connecting an external LED to the Ethernet PHY.

11

GND

General.

12

SPI_MOSI

SPI_MOSI line. Connected to pin IO13 of the ESP32.

13

GPIO0

Input/Output. Connected to the IO16 pin of the ESP32. Reserved for SPI_CS.

14

SPI_MISO

SPI_MISO line. Connected to the IO12 pin of the ESP32.

15

SPI_CLK

SPI_CLK line. Connected to pin IO14 of the ESP32.

16

GND

General.

17

I2C_SCK

I2C_SCK line. Connected to the IO4 pin of the ESP32.

18

I2C_SDA

I2C_SDA line. Connected to the IO5 pin of the ESP32.

19

GND

General.

20

UART1_RX

UART1_RX line. Connected to the I34 pin of the ESP32 (input only).

21

UART1_TX

UART1_TX line. Connected to the IO33 pin of the ESP32.

22

UART2_TX

UART2_TX line. Connected to the IO2 pin of the ESP32.

23

UART2_RX

UART2_RX line. Connected to the I39 pin of the ESP32 (input only).

24

GND

General.

25

GPIO1

Input/Output. Connected to the IO32 pin of the ESP32. Reserved for CAN_TX.

26

GPIO2

Input/Output. Connected to pin IO15. Reserved for CAN_RX.

27

GND

General.

28

GPIO3

Input. Connected to pin I36 of ESP32. Reserved for INT1 (interrupt signal from port expander).

29

GPIO4

Input. Connected to pin I35 of ESP32. Reserved for INT2 (interrupt signal from expansion modules).

30

GPIO5

Input/Output. Connected to GPIO port expander IO1_0

31

GPIO6

Input/Output. Connected to GPIO port expander IO1_1

32

GPIO7

Input/Output. Connected to GPIO port expander IO1_2

33

GPIO8

Input/Output. Connected to GPIO port expander IO1_3

34

GPIO9

Input/Output. Connected to GPIO port expander IO1_4

35

GPIO10

Input/Output. Connected to GPIO port expander IO1_5

36

GPIO11

Input/Output. Connected to GPIO port expander IO1_6

37

CPU_RESET

ESP32 hardware reset.

38

GND

General.

39

USB_DN

Not used.

40

USB_DP

Not used.

40-pin connector on the motherboard

Pin assignment of 40-pin motherboard connector PD-76-R5 (v2)

Contact

Title

Purpose PD76-R5

1

+5.0V

Processor module power supply +5V

2

+5.0V

Processor module power supply +5V

3

GND

General

4

GND

General

5

ETH_TXN

Connecting an external transformer to the Ethernet PHY

6

ETH_TXP

Connecting an external transformer to the Ethernet PHY

7

ETH_RXN

Connecting an external transformer to the Ethernet PHY

8

ETH_RXP

Connecting an external transformer to the Ethernet PHY

9

ETH_LED1

Connecting an external LED to the Ethernet PHY

10

ETH_LED0

Connecting an external LED to the Ethernet PHY

11

GND

General

12

SPI_MOSI

Not used

13

GPIO0

Output to the 1-Wire DIO terminal

14

SPI_MISO

Not used

15

SPI_CLK

Not used

16

GND

General

17

I2C_SCK

Internal I2C bus

18

I2C_SDA

Internal I2C bus

19

GND

General

20

UART1_RX

Output to the internal GPIO connector - UART1 RX

21

UART1_TX

Output to the internal GPIO connector - UART1 TX

22

UART2_TX

Not used

23

UART2_RX

Not used

24

GND

General

25

GPIO1

Output to the internal GPIO connector - GPIO1

26

GPIO2

Output to the internal GPIO connector - GPIO2

27

GND

General

28

GPIO3

Interrupt from GPIO port expander

29

GPIO4

Not used

30

GPIO5

Not used

31

GPIO6

Not used

32

GPIO7

Not used

33

GPIO8

Not used

34

GPIO9

Not used

35

GPIO10

Not used

36

GPIO11

Not used

37

CPU_RESET

Output to internal connector J3

38

GND

General

39

USB_DN

Not used

40

USB_DP

Not used

GPIO connector

Connector type: PLD-2x3 with 2.54 mm pitch

Contact

Destination

1

UART1 TX

2

GPIO1

3

UART1 RX

4

GPIO2

5

GND

6

3.3В

Console

The processor module board has a USB-UART interface converter on the microchip CP2102, and a MicroUSB connector on the front panel of the controller.

Power

The following power supply options are available:

  • From an external stabilized DC source via an external terminal.

    Note

    • Recommended (rated) input voltage range 12V to 48V

    • The maximum input supply voltage range is 9 to 56V.

    • A stabilized DC power supply of at least 5W must be used.

  • Via technology Passive PoE via the Ethernet port connector.

    Note

    • Recommended nominal input supply voltage Passive PoE - 12 to 48V

    • The polarity does not matter. The recommended power scheme is: “+” power supply to pins 4 and 5, “-” power supply to pins 7 and 8 of the Ethernet connector

Note

If power is applied to both the external terminal and the Ethernet connector at the same time, power will be supplied from a high voltage source. It is recommended to use one of the power supply options.

Warning

There is no galvanic isolation of the power supply circuits in the controller.

Software

See also

Installing

Officially supported software:

  • ESPHome - ESP32 firmware to work with Home Assistant.

  • ESP-IDF - official SDK from Espressif for development on ESP32.

Note

It is also possible to use any other software for ESP32: Tasmota, Arduino and others.

Controller firmware

The ESP32 microcontroller has the ability to flash over a dedicated UART0 interface (pins IO34 and IO35 of the ESP32 module).

For flashing it is enough to connect the processor module board to the computer through the USB interface, through the MicroUSB connector on the front panel of the controller.

Note

When using standard tools for flashing ESP32 microcontrollers the switch to the bootloader mode is made automatically when flashing.

Note

  • The processor module can be powered from the MicroUSB connector during flashing.

  • This will not supply power to the lower controller board.

Safety precautions

  • During operation and maintenance of the controller the requirements of GOST 12.3.019-80, “The rules of operation of electrical installations of consumers” and “Safety rules for the operation of electrical installations of consumers” should be observed.

  • Any connections to the unit and maintenance work should be performed only when the controller and the actuators connected to it are de-energized.

  • Only qualified service personnel should be allowed physical access to the controller during installation and maintenance.

  • Do not allow moisture to get on the contacts of output connectors and internal elements of the controller.

  • The controller must not be used in the presence of acids, alkalis, oils and other aggressive substances in the atmosphere.

  • The controller is not intended for use on objects that are potentially dangerous to life and health of others.

  • It is not allowed to connect the instrument to the local Ethernet network with access to the Internet network without providing reliable means of interconnection protection.

Mounting

The unit can be installed in an electrical equipment cabinet or other location, where it must be protected from moisture, dirt and foreign objects, as well as vibration-free.

Note

For better cooling of the internal components, the housing should be installed in an upright position.

To install it, you have to:

  • Make sure there is enough space to connect the device and run the wires.

  • Securely fasten the unit to the DIN rail or to a vertical surface with screws.

To remove it from the DIN-rail you should:

  • Insert the tip of a screwdriver into the latch eyelet.

  • Press the latch down.

  • Take the controller away from the DIN rail.

Operating conditions

  • Ambient temperature: 0..+40 С.

  • Relative humidity up to 80% without condensation.

  • Closed explosion-proof rooms without aggressive vapors and gases.

Wiring recommendations

It is recommended that stranded copper cables be used to ensure reliable electrical connections. The cable ends should be stripped and then tinned or cable lugs should be used. The cable strands should be stripped so that their bare ends do not protrude beyond the terminal block after connection to the controller.

General requirements for connection lines:

  • When laying the cables, the communication lines that connect the device to the sensors or other devices should be separated into separate routes, and located separately from power cables and cables that cause high-frequency and pulse interference.

  • To protect the inputs of the device from the influence of electromagnetic interference, the communication lines of the controller should be shielded. Special cables with braided shielding can be used as shields.

  • It is recommended to install line noise filters in the power line of the controller.

  • In the case of controlling power equipment, it is recommended that spark-quenching filters be installed on the switching line of this equipment.

Limitations

Warning

The device is not intended for use in facilities potentially endangering the life and health of others, as well as life support systems and other critical systems.