PUSR USR-M100-ARD User manual

USR-M100-ARD User Guide
pusr.com
1
1
Open Source IoT Gateway
(Cost effective)
Be Honest & Do Best
Your Trustworthy Smart Industrial IoT Partner
User Guide
USR-M100-ARD
V2.0

USR-M100-ARD User Guide
pusr.com
1
- 2 -
Content
1. Introduction ...............................................................................................................................................- 4 -
1.1. Overview...........................................................................................................................................- 4 -
1.2. Parameters table...............................................................................................................................- 4 -
1.3. Pin Mapping......................................................................................................................................- 5 -
1.4. Indicators..........................................................................................................................................- 6 -
1.5. Dimension ........................................................................................................................................- 6 -
1.6. Development Environment ................................................................................................................- 6 -
2. Development Environment Setup................................................................................................................- 6 -
2.1. Main steps to set up a development Environment ..............................................................................- 6 -
2.2. Specific Step Instructions...................................................................................................................- 7 -
2.2.1. Download and install Arduino IDE ............................................................................................- 7 -
2.2.2. Add Boards Manager URLs .......................................................................................................- 7 -
2.2.3. Install ESP32 Boards.................................................................................................................- 7 -
2.2.4. Install the Needed library file ...................................................................................................- 8 -
2.2.5. Add AWS_IOT library file...........................................................................................................- 9 -
3. Program burning........................................................................................................................................- 9 -
3.1. Hardware connection........................................................................................................................- 9 -
3.2. Programming via Arduino ...............................................................................................................- 10 -
3.2.1. Downloading parameters settings..........................................................................................- 10 -
3.2.2. Download Program................................................................................................................- 11 -
3.3. Programming via ESP32 download tool ...........................................................................................- 11 -
3.3.1. Export compiled binary file.....................................................................................................- 12 -
3.3.2. Load BIN file .......................................................................................................................... - 12 -
4. Function introduction and testing .............................................................................................................- 15 -
4.1. Get starting.....................................................................................................................................- 15 -
4.2. IO Interface ..................................................................................................................................... - 15 -
4.3. STA setting......................................................................................................................................- 15 -
4.4. TCP mode setting ............................................................................................................................- 16 -
4.5. MQTT mode setting .........................................................................................................................- 16 -
4.6. Connecting to AWS platform............................................................................................................- 18 -
5. Contact Us................................................................................................................................................ - 21 -

USR-M100-ARD User Guide
pusr.com
1
- 3 -
6. Disclaimer................................................................................................................................................- 21 -

USR-M100-ARD User Guide
pusr.com
1
- 4 -
1. Introduction
1.1. Overview
USR-M100-ARD is an open source IoT gateway powered by Espressif’s ESP32 module equipped with low
power Xtensa® 32-bit LX6 MCU 240 MHz processor with 4MB pSRAM and up to 8MB SPI flash memory on-board. It
integrates rich hardware interface: RS485/232, DO*2, DI*1, AI*1, downloading port, Wi-Fi, Ethernet port and BLE.
PUSR provides basic source code demo for users to develop their own application. For the rich hardware
interface and networking methods, this device can be applied in a variety of scenarios, especially scenarios
where users need to collect or control serial devices and IO devices simultaneously, such as: Wastewater
Treatment, Agricultural Irrigation, Solar Energy, Intelligent Farming etc.
1.2. Parameters table
USR-M100-ARD Parameters
Chipset
ESP32-WROVER-E
Professor
Dual-core Xtensa® 32-bit LX6 MCU, 1.2GHz
RAM
8M
Flash
4M
Power Supply
9~36V
Hardware Interface
RS232/485
1*RS232/485
Default parameter: 115200, N, 8, 1
DI
1*digital input, (0 - 2 V detected as logic low, 9 - 36 V detected as logic high)
DO
2*digital output
DC contacts rating @R(at resistive load)10A / 28V DC, NC
AC contacts rating @R(at resistive load)10A / 277V AC,NC
AC contacts rating @R(at resistive load)5A /250V AC, NO
AI
1*analog input(4~20mA)
Wi-Fi
Standard
IEEE802.11b/g/n
Speed
Up to 150Mbps
Frequency
2412 ~ 2484 MHz
Others
BLE
Compatible with BEL4.2
Table 1. Parameters of USR-M100-ARD

USR-M100-ARD User Guide
pusr.com
1
- 5 -
1.3. Pin Mapping
The table shows the corresponding relationship between the hardware interface pins of M100 and the pins
of the main control ESP32.
Users can also download the schematic diagram corresponding to the M100. Download link:
https://www.pusr.com/support/download/Schematic-Diagram-Hardware-schematic-diagram-Of-USR-M100-
ARD.html
Pins of M100
Pins of ESP32
Function
No.
Interface
Pin
Pin Name
No.
Description
1
RMII Interface
RMII_MDIO
IO18
30
For Ethernet port
2
RMII_MDC
IO23
37
3
RMII_REF_CLK
IO0
25
4
RMII_TXD0
IO19
31
5
RMII_TXD1
IO22
36
6
RMII_RX0
IO25
10
7
RMII_RX1
IO26
11
8
RMII_TXEN
IO21
33
9
RMII_CRS_DV
IO27
12
10
PHY Reset
PHY_RESET
IO5
29
11
RS485/232
UART1_TX
IO32
8
For serial port
12
UART1_RX
IO33
9
13
RS485_EN1
IO12
14
14
Reserved RS485
UART2_TX
IO13
16
Reserved, for IO expansion
machine
15
UART2_RX
IO34
6
16
RS485_EN2
IO14
13
17
Latch control
OE
IO4
26
Register input/control pin
18
LE
IO15
23
IO2
24
19
DO
DO1
DO1
Q1
Digital output(Not connect to
ESP32 directly)
20
DO2
DO2
Q2
21
DI
DI1
SENSOR_VN
5
Digital input
22
AI
ADC1
IO35
7
Analog input
23
Watchdog
MCU_WDI
RXD0
34
Pin for feeding watchdog
24
Reload
Reload
SENSOR_VP
4
1. Reset to factory settings
2. Enable program flashing mode
25
LED
LED_WORK
U0_RX
34
Work indicator
26
Reset
RESET
EN
3
Reset pin for watchdog
27
Flashing
SWCLK
U0_TX
35
Program Flashing
28
SWDIO
U0_RX
34

USR-M100-ARD User Guide
pusr.com
1
- 6 -
1.4. Indicators
USR-M100-ARD provides 2 indicators in total, the specific description is as follows.
Table 2. LED indicator
Name
Description
PWR
Steady on: power supply is normal.
Off: No power supply or abnormal power supply.
WORK
Blinking: The system works normally.
1.5. Dimension
➢DIN-Rail mounting and wall mounting supported.
➢79.6*58*110.0mm (L*W*H, accessories not included)
Figure 1. Dimension of USR-M100-ARD
1.6. Development Environment
Users can use the Arduino IDE provided by Arduino for development, or they can use the ESP-IDF tool
provided by ESP32 for development. This document is introduced based on the Arduino IDE development
environment.
2. Development Environment Setup
2.1. Main steps to set up a development Environment
For the steps to build a secondary development environment, refer to the picture below. The specific
operation steps will be introduced in detail in the following chapters.

USR-M100-ARD User Guide
pusr.com
1
- 7 -
2.2. Specific Step Instructions
2.2.1. Download and install Arduino IDE
Download and install Arduino IDE: https://www.arduino.cc/en/Main/Software
2.2.2. Add Boards Manager URLs
After installing the IDE, add additional boards manager URLs:
https://dl.espressif.com/dl/package_esp32_index.json
File->Preference-> Add Additional Boards Manager URLs
2.2.3. Install ESP32 Boards
Tools->Board Manager->Search “ESP”

USR-M100-ARD User Guide
pusr.com
1
- 8 -
2.2.4. Install the Needed library file
If users test the demo code provided by the PUSR, the following Library files need to be installed first:
•ESPAsyncWebServer
•ArduinoRS485
•ArduinoModbus
•PubSubclient
•OneButton
•Sketch->Library Manager->Search ”ESPAsyncWebServer”->Install
Users can also download the other libraries needed on Arduino IDE.

USR-M100-ARD User Guide
pusr.com
1
- 9 -
2.2.5. Add AWS_IOT library file
PUSR offers library source code of AWS, users can download from:
https://www.pusr.com/support/download/Library-File-AWS-IOT-File-Provided-by-PUSR.html
The downloaded libraries should be copied to the installation path of Arduino IDE.
Note: If the AWS code is needed, users are strongly encouraged to use the AWS libraries we provide.
3. Program burning
There are two main ways of burning firmware: through Arduino IDE and the tool provided by ESP32. The
specific usage methods of the two burning tools are introduced below.
No matter which method is used to burn, the download cable needs to be connected in advance.
3.1. Hardware connection
Before you start, some preparations is needed.
•USR-M100-ARD*1
•USB to TTL converter *1
•Wi-Fi antenna*1
•USB to RS485/232 Cable*1
•12V/1A Power Adapter*1
The hardware connection is like this:

USR-M100-ARD User Guide
pusr.com
1
- 10 -
3.2. Programming via Arduino
3.2.1. Downloading parameters settings
Tools-->Board-->”ESP32-WROOM-DA Module”
Tools-->Board-->Port-->Select the right COM. Users can check the COM port in device manager like the
following picture. If there is not this COM port in device manager, users can install the serial port driver.
Download link: https://www.pusr.com/support/download/Serial-Driver-USB-To-Serial-Driver.html