JetHub E1-PD76-R5 (v1) microcontroller

Hint

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

General Description

The JetHub PD76-R5 (v1) controller is designed to control the power load in home automation systems.

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

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:

6. Dual-color custom LED (STAT)

7. Power supply indication LED (PWR)

8. User button

On the underside of the controller are:

9. Ethernet RJ45 connector

10. Discrete input terminal 4-5

11. Discrete inputs terminal 1-3

12. 12-48V DC power terminal

On the front panel of the controller there are also:

13. MicroUSB connector

14. Internal optional user button

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

• v1.3

  • PCA9535 port expander chip is installed instead of PCF8575.

• 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

• v1.2

  • Initial Version

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.

  For more information on controlling LEDs, see “GPIO Port Extenders “ in this documentation.

• 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.

See also

• ESP32 GPIO & RTC GPIO

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

Processor module 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.

See also

• Working with the CJMCU-232H JTAG debugger in esp-idf

Pin assignment

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

Output	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

Processor module port expander

To increase the number of GPIO ports of the processor module, the module has a GPIO port expander chip PCF8575 or PCA9535 (starting with revision 1.3 of the processor module) connected to the I2C bus.

The address on the I2C bus is 0x20.

Processor module 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 for v.1 controllers
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

LED control logic for processor module revisions 1.1 and 1.2: logic level 0 - LED on, logic level 1 - LED off. By default, the logic level 1 (LEDs off) is set on the port expander outputs after power-up.

LED control logic for processor module revision 1.3: logic level 0 - LED off, logic level 1 - LED on. By default, the logic level 0 (LEDs off) is set on the port expander outputs after power-up.

The state of the optional user button for module revision 1.1 is determined by the following logic levels at the port expander input: 0 - button closed (pressed), 1 - button open. This button is not used in subsequent revisions of the processor module.

Internal connectors

ESP32-WROOM-32 module outputs

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

Output	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 (v1)

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	Reserved (JXM)
13	GPIO0	Reserved (JXM)
14	SPI_MISO	Reserved (JXM)
15	SPI_CLK	Reserved (JXM)
16	GND	General
17	I2C_SCK	Reserved (JXM)
18	I2C_SDA	Reserved (JXM)
19	GND	General
20	UART1_RX	Output to pin 4 of the UART1 connector
21	UART1_TX	Output to pin 3 of the UART1 connector
22	UART2_TX	Not used
23	UART2_RX	Not used
24	GND	General
25	GPIO1	Output to pin 3 of connector IO1
26	GPIO2	Output to pin 4 of connector IO1
27	GND	General
28	GPIO3	Output. Interrupt from GPIO port expander
29	GPIO4	Output. Interrupt from the JXM module
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	Not used
38	GND	General
39	USB_DN	Not used
40	USB_DP	Not used

UART1 connector

Connector type: MICRO JST

Contact	Destination
1	SERIAL_ID_VOLTAGE
2	GND
3	UART1_TX (40-pin)
4	UART1_RX (40-pin)

IO1 connector

Connector type: MICRO JST

Contact	Destination
1	IO_ID_VOLTAGE
2	GND
3	GPIO1 (40-pin)
4	GPIO2 (40-pin)

JXM connector

Warning

The format of the JXM connector has been changed in future versions. Use is not recommended.

JXM PLD-2x6-2.54

Contact	Destination	Description
1	SLOT_ID0_ADC	To set the slot number. Used by the module to determine the slot number in which it is installed.
2	SLOT_ID1_ADC	To set the slot number. Used by the module to determine the slot number in which it is installed.
3	PWR_5V	Power +5V
4	PWR_3V3	Power +3.3V
5	GND	General
6	I2C_SCL	I2C bus (common to all modules)
7	I2C_SDA	I2C bus (common to all modules)
8	SPI_MOSI	SPI bus (common to all modules)
9	SPI_MISO	SPI bus (common to all modules)
10	SPI_SCK	SPI bus (common to all modules)
11	MOD_SEL	Chip Select input for selecting an SPI module/circuit (activated by a low logic level)
12	MOD_INT	Interrupt output from the module (low logic level). The circuit must provide a mounted OR - open collector output.

JXM PLD-2x2-2.54

Contact	Destination	Description
1	IO_3	It is connected to an external terminal.
2	IO_2	It is connected to an external terminal.
3	IO_4	Output to external terminal. (may not be used for 3-pin module.)
4	IO_1	It is connected to an external terminal.

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

  • The recommended nominal input supply voltage Passive PoE is 12 to 48V.

  • The polarity of the connection does not matter.

Note

When power is simultaneously applied to both the external terminal and the Ethernet connector, power will be supplied from the external terminal.

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.

Useful Links

• The ESP32 Pin list is a list of ESP32 pins and their functions.