RPMS-hardware

Intro

MedIOT project uses the NodeMCU as main embedded system. It is selected nodeMCU as the main platform because it contains an integrated ESP8266MOD wifi module with Arduino nano board. A digital temperature sensor DS18B20 sensor and Pulse sensor is using as inputs to the nodemodule.

Before get started

1. Install Arduino SDK and ESP8266 Board Manager

2. Install following Arduino libraries by Sketch>Library>Library Manager ;

   • Arduino JSON- (by Benoit Blanchan) Link
   • Arduino Mqtt (by Oleg Kevolenko) - Link
   • Arduino LCD I2C Lib - Link

3. Set the sketch option from Tools menu as follows

Board Configuration

In this, we are using two sensors, Heart Pulse sensor and Temperature sensor. Pulse sensor is given to A0 input, and Temperature sensor DS18B20 given to GPIO input

For ESP.Restart() nodemcu checking the pins for booting. Here we are boot from the sketch So according to the following table GPIO0 and GPIO1 should connected to 3V3 Vcc and GPIO15 should connected to GND with resistors .

if the wdt reset is triggert the board reboots, when it reboots it is checking the state of GPIO0 and GPIO15 and GPIO2

GPIO15	GPIO0	GPIO2	Mode
0V	0V	3.3V	Uart Bootloader
0V	3.3V	3.3V	Boot sketch
3.3V	x	x	SDIO mode (not used for Arduino)

you need to make sure that the pins in the right state when a wtd happens or you call ESP.restart() better you add some delays to prevent the wtd from triggering.

Important : All the above connetions should be made with a 10K resistors

Run the code

1. Compile and Upload the code to the Nodemcu
2. Open SerialMonitor
3. Restart the Nodemcu
4. SoftAP WiFi is set on the relevent ip address shown in the serial monitor. default WiFi SSID-> Mediot1

API End Points

API end points of the Sever as follows;

Server default Address: 192.168.4.1:8080

---

Show Server Status

Get the status of the server.

URL : /api/status/

Method : GET

Auth required : NO

Permissions required : None

Success Response

Code : 200 OK

{
    "status": "ok"
}

---

Set Configurations

Setting the WiFi credentials and API end point of the mqtt server

URL : /api/config/

Method : POST

Auth required : --

Permissions required : --

Data constraints

Provide wifi details and api end point.

{
	"ssid":"YOURWIFISSID",
	"password":"YOURWIFIPASSWORD",
	"link":"MQTT_SERVER"
}

Success Response

Code : 200 OK

{
    "status": "ok"
}

---

Save Configuration

Saving the given wifi credentials and end point

URL : /api/finish

Method : GET

Auth required : NO

Permissions required : None

Success Response

Code : 200 OK

{
    "status": "ok"
}

Board Schemetics

Schemetic Design

PCB Design