Compatible with ARDUINO, ESP12.OLED_V1 controllers, NodeMCU board (based on ESP8266-12), modules on the ESP8266EX, ESP32 or other chip, which are powered by a voltage in the range from 1.8 to 5.5 V.

Functionality

The module connects to the main controller via a 4-wire I2C bus interface and provides the following functions:

• Data entry with a five-button keyboard (left, right, down, up, OK)
• Data output to RGB LED;
• Output of sound sequences to the active indicator of the buzzer type;
• I2C bus input and output through ports. Input for connection to MCU and output – for connection of any external devices that support the I2C specification.

Thanks to the use of the I2C bus and the MCP23017 port expander, GPIO savings of the main controller and the ability to input and output information in a user-friendly way are achieved. The rest of 7 GPIOs are connected to separate pin connectors for additional I / O signals connection according to the user’s design.

Int A & Int B output signals are available – can be used for interrupt processing when the state of the module inputs changes.

Application

I2CUI4_V1 will be convenient to use as a control panel and status display in user devices:

• electronic clocks,
• radiation level dosimeters,
• smart outlets,
• thermostats,
• multimedia and audio devices,
• weather stations and others.

Compatibility

Compatible with controllers and platforms:

• ARDUINO,
• ESP12.OLED_V1,
• NodeMCU board (based on ESP8266-12),
• modules on the ESP8266EX chip,
• ESP32,
• or others powered by 1.8 – 5.5 V;
• integration into Home Assistant (with ESP Home plugin), Blynk, OpenHab, Node-RED, Tasmota is possible.

Minor and major versions of the module

Unlike the minor version I2CUI3_V1, the I2CUI4_V1 user interface module uses a widely supported 16-bit MCP23017 port expander. This makes it possible to use this module in devices for integration into Home Assistant, Arduino and many others.

Chips of user interface modules:

• I2CUI3_V1 – 8-bit, I2C, PCA9538, 2^3 GPIOs;
• I2CUI4_V1 – 16-bit, I2C, MCP23017, 2^4 GPIOs.

The major version of I2CUI4_V1 has the following features:

• single digital interface – 2 x I2C (input / output) ports;
• 5 “joystick” buttons; sound indicator; RGB LED indicator;
• selection of one of 8 module addresses on the I2C bus via solred-pads;
• 7 free GPIOs are connected to separate pin connectors.

Driver-level support

Support for the MCP23017 chip at the driver level is stated in particular by the following platforms:

Assignment of module ports

Power supply and consumption

Power supply of the module is possible in the range of voltages of 1,8 – 5,5 volts. The current consumption of the I2CUI4 module at rest is about 1 microampere. In the case of simultaneous data output to R + G + B + buzzer, the maximum current consumption can reach 20 milliamperes.

Addressing on the I2C bus

The address of the module has a fixed and variable part:

The address of the module I2CUI4_V1 is selected in accordance with the documentation on the chip MCP23017, because it is this chip of the module that interacts with the main controller via the I2C bus.

Interrupt handling

The module has two interrupt channels: Int A and Int B. All processing and logic (active-low) corresponds to the documentation for the MCP23017 chip. Interrupt processing is provided for the master controller to monitor changes in GPIO states set to input mode.

According to the design of the interface module I2CUI4_V1, input mode:

• must be set for:
  • GPIO 11 (GPA3) – Key Up on board
  • GPIO 12 (GPA4) – Key Down on board
  • GPIO 13 (GPA5) – Key Left on board
  • GPIO 14 (GPA6) – Key Right on board
  • GPIO 15 (GPA7) – Key OK on board
• can be set for spare GPIO ports if used by the user as inputs: GPIO 1 (GPB1), GPIO 2 (GPB2), GPIO 3 (GPB3), GPIO 4 (GPB4), GPIO 5 (GPB5), GPIO 6 (GPB6) ), GPIO 7 (GPB7).

Ports GPIO 0 (GPB0) Buzzer on board, GPIO 8 (GPA0) LED – Blue on board, GPIO 9 (GPA1) LED – Green on board, GPIO 10 (GPA2) LED – Red on board – work on the module as outputs.

Module dimensions

• Dimensions of the module board 50 x 52 mm,
• Module height (Z): 15 mm.

Product kit sets

The module is delivered in the following sets:

• Basic set:
  • 1 pc – I2CUI4_V1 user interface module;
  • PCB Headers ( Dupont Headers ) 2,54 20p – 1 pc.

• Basic + Connectors set: (Note: The user receives the module with installed connectors )
  • 1 pc – Basic set;
  • Connectors:
    • JST XH 2,54 2p – 1 pc:
    • JST XH 2,54 4p – 4 pcs..

• Basic + Connectors + Cables set: (Note: The user receives a module with installed connectors )
  • 1 pc – Basic + Connectors set;
  • Cables:
    • JST XH 2,54 4p – JST XH 2,54 4p – 1 pc.
    • JST XH 2,54 2p – JST XH 2,54 2p – 1 pc.
    • JST XH 2,54 4p – Dupont 4p – 1 pc.
    • JST XH 2,54 2p – Dupont 2p – 1 pc.

Technical description: i2cui4_v1-product-description-ukr, i2cui4_v1-product-description-eng.

References

The port expander chip used in the module:

Manufacturer message

Dear Reader! Thank you for your interest in our products. We hope that you enjoy this device. IoT-devices was born thanks to the support of our customers and thanks to our experience and love for Electronics.

Designed and made by IoT-devices with freedom & wisdom in Ukraine – 2021. All rights reserved.

Purpose and compatibility

PS4IoT is an uninterruptible power supply module with battery charging and protection, for building smart devices with power paths’ redundancy, with 3.0 to 6 volts and 3V3, 5V or 12V output voltages, with total power up to 5 watts.

The module is designed for use in electronic devices based on any microcontroller platform, such as ESP8266, ESP32, Arduino, STM32, and derivative boards ( ESP12.OLED, NodeMCU, etc.) as an autonomous or software-controlled power supply unit.

Features

• Start from AC/DC adapter when the battery is deeply discharged;
• Start from AC/DC adapter when there is no battery;
• Automatic battery charging and simultaneous use of the device;
• Possibility to replace the battery without interrupting power from the AC/DC adapter;
• When powered by the AC/DC adapter, the battery is not connected to the load, which saves the number of charge-discharge cycles (prolongs battery life).

Capabilities of the module with basic settings

This tiny module may surprise you with many important and interesting functions. PS4IoT_V1 with basic settings provides:

• Automatic online switching “battery-mains” and vice versa, without interruption of output voltage generation (12V, 5V, 3V3) of loads;
• Automatically switches to AC/DC adapter 5V when the battery is disconnected without interrupting power to the loads;
• Automatic battery charge/discharge control; Default charge current is set to 0.5 A. The state of the battery charging process is displayed by two LED indicators.

Module application profiles

The module can provide the following profiles for autonomous and controlled use as part of a smart device:

• a battery-free device powered only by an AC/DC 5V adapter;
• a device powered by Li-Ion battery and AC/DC adapter 5V
• a device with rechargeable Li-Ion battery only;
• a device with fault-tolerant redundancy of 3 power supply paths.

Smart power supply module formula

Online Uninterruptible Power Supply Unit module

• With automatic charger and selectable power source;
• Intelligent and connected;
• With power source redundancy layout;
• Fully autonomous or sufficiently managed;
• With or without a battery;
• For pockets or stationary;
• With simultaneous charging and power supply of load;
• Indoor or outdoor;
• In inexpensive and miniature design;
• Best suited for smart devices and IoT;

As you can see from our “formula”, you can simultaneously power one or more payloads, connect a controller with any functionality to the module according to your design idea – in other words, you can create the most demanding portable and stationary devices using the PS4IoT_V1 module.

This module is a versatile component that will provide reliable power, observability and controllability for your DIY or even commercial product.

PS4IoT acts as an intelligent intermediary between the load and all available power sources.

This power supply automatically protects the device and the battery, providing consumers with the ease and simplicity of using the end device in a way that is only found in high-quality and high-tech smartphones.

Module functions

Battery protection and safety functions

Module block diagram

Software monitoring of Li-Ion battery charging status

PS4IoT_V1 has a number of signal lines that allow the main controller to monitor the charging process status, temperature, and battery voltage programmatically. For example, if a mismatch is detected, such as exceeding the charging time or battery temperature, the controller can programmatically stop or restore the charging process. In addition, these mechanisms in combination with the sleep mode are reasonable to use in the charge/discharge control software algorithm to extend battery life.

Note. What if we make two interfaces at once on the GGreg20 module: pulse output and I2C? This would be very convenient, but the clients’ costs increase unnecessarily in that case. The companion controller occupies a certain area on the module board. The I2C bus occupies twice as many controller ports as the pulse output. All that adds significantly to the unit price. On the other hand, the pulse counting output interface takes up only one controller GPIO with an interrupt handler and is much easier to code. The current version of the GGreg20 module can work without a controller at all: a user can use a watch to monitor the duration of the radiation measurement and count led blinks manually. The PS4IoT_V1 version of the module does not support connecting an NTC battery thermistor directly to the charging controller. Therefore, temperature monitoring can be implemented by connecting an additional temperature sensor to the main controller using I2C bus or other interfaces such as 1-Wire, SPI, NTC-thermistor, etc. Thus, through the Charge Enable signal (see CEset.2) the controller can prohibit or allow charging depending on the battery temperature.

The interfaces are located on one side of the module

It is recommended to design the case of the device where you plan to install PS4IoT_V1 so that the bottom edge of the PS4IoT module board touches one of the outer sides of the case, as shown in the pictures. In that case

• Charge control LED;
• Power supply input 1 (μUSB);
• ON/OFF main switch;
• Aux spare interface – the connector for external devices;

can be used to organize a convenient interface to control the entire device through the user-provided mounting holes in the housing.

Cautions

Caution! Use quality batteries to obtain the declared technical characteristics of the product.

Caution! Use quality AC/DC adapters with appropriate cables capable of withstanding 5 volts with a load of up to 2 amps.

Caution! Maximum permissible load current:

• to the output 12V – 150 mA;
• to the output 5V – 1A;
• to the output 3.3V – 1A.

!! The maximum total load on the charger and outputs is up to 5 Watts.

Delivery sets

Set №1 – only PS4IoT_V1 module (Basic)

1. PS4IoT_V1 module – 1 pc;
2. Jumper on the board – 2 pcs;
3. Pin connector 2.54 2P M, straight, included – 7 pcs;
4. Pin connector 2.54 4P M, straight, included – 3 pcs.

Set №2 – module with connectors and cables (Basic + Connectors (installed) and cables)

1. PS4IoT_V1 module – 1 pc;
2. Jumper on the board – 2 pcs;
3. Pin connector 2.54 2P M, straight, included – 7 pcs;
4. Pin connector 2.54 4P M, straight, included – 3 pcs.
5. Battery cable, flat, 15 cm, 2 wires, with connectors – 1 pc: 2P JST XH2.54 F – Dupont 2x1P F.
6. Power output cable, flat, 20 cm, 2 wires, with connectors – 2 pcs: 2P JST XH2.54 F – Dupont 2x1P F.
7. Charging status output cable CP&CC, flat, 20 cm, 2 wires, with connectors – 1 pc: 2P JST XH2.54 F – Dupont 2x1P F.
8. Battery level output cable, flat, 20 cm, 2 wires, with connectors – 1 pc. 2P JST XH2.54 F – Dupont 2x1P F.
9. JST XH 2.54 2P M connector, straight, on the board – 7 pcs;
10. JST XH 2.54 4P M connector, angled, on the board – 1 pc;
11. JST XH 2.54 4P M connector, straight, on the board – 1 pc;

Note : In this version, these connectors are soldered to the board and are ready to use with the appropriate cables.

Options № 3 – module with connectors and cables (Basic + Connectors (installed) and cables + AUX )

1. PS4IoT_V1 module – 1 pc;
2. Jumper on the board – 2 pcs;
3. Battery cable, flat, 15 cm, 2 wires, with connectors – 1 pc: 2P JST XH2.54 F – Dupont 2x1P F.
4. Power output cable, flat, 20 cm, 2 wires, with connectors – 2 pcs: 2P JST XH2.54 F – Dupont 2x1P F.
5. Charging status output cable CP&CC, flat, 20 cm, 2 wires, with connectors – 1 pc: 2P JST XH2.54 F – Dupont 2x1P F.
6. Battery level output cable, flat, 20 cm, 2 wires, with connectors – 1 pc. 2P JST XH2.54 F – Dupont 2x1P F.
7. JST XH 2.54 2P M connector, straight, on the board – 7 pcs;
8. Pin connector 2.54 2P M, straight, included – 7 pcs;
9. Pin connector 2.54 4P M, straight, included – 3 pcs.
10. JST XH 2.54 4P M connector, angled, on the board – 1 pc;
11. JST XH 2.54 4P M connector, straight, on the board – 1 pc;
12. Internal interface cable, flat, 15 cm, 4 wires, with connectors – 1 pc. 4P JST XH2.54 – Dupont 4x1P.
13. External interface cable, flat, 30 cm, 4 wires, with connectors – 1 pc. 4P JST XH2.54 – Dupont 4x1P.

Note : In this version, these connectors are soldered to the board and are ready to use with the appropriate cables.

Attention. AC/DC adapter(s), battery pack, solar panel and temperature sensor are not included.

Full technical description: PS4IoT_V1 power supply unit description UKR , PS4IoT_V1 power supply unit description ENG

Module presentation: PS4IoT_V1 quick facts