This is a project to demonstrate motion detectors for sensing a person moving around in a room.

• Doppler sensor: NJR4265 J1
• Force sensing registor: FSR406
• Hall sensor: A1324LUA-T
• GPS tracker (GPS module enclosed in my original 3D-printed case)
• Thermistor
• CdS

• MOSFET: 2SK2232

Physical

 [Sensor]--AnalogIn--[PIC16F1825]--UART--[FTDI]--USB--[RasPi]--WiFi--[Tablet or PC]
 
 [Sensor module]--UART--[FTDI]--USB--[RasPi]--WiFi--[Tablet or PC]

Logical

Raw data <--->[serial-mqtt bridge]<--MQTT-->[mosquitto]<--MQTT over WebSocket-->[SPA/AngularJS/HTML5/Chrome]

I have been owing this "serialport" package a lot for my IoT prototyping projects since 2016: https://www.npmjs.com/package/serialport

• Obtaining mosquitto with WebSockets enabled
• Building browserMqtt.js

I often use Android tablets for demonstrating an IoT prototype. Here is a tip to makeing a HTML5 page fulsucreen on Android: https://developer.chrome.com/multidevice/android/installtohomescreen

I know about TypeScript and Angular2, but I stick to AngularJS. I choose AngularJS over Angular2 for IoT prototyping for a lot of reasons.

I have developed 10bit ADC (4 analog-in ports) on PIC16F1825.

Pin numbers:

[AN6|AN5|AN4|AN2]
 P4  P3  P2  P1

CLI:

t:125\n  --> set the interval to 8msec * 125 = 1sec 

f:3\n  --> activate anaglon-in ports (b0011: P2 and P1)

I use this ADC with very cheap thermistor, CdS and Force Sensing Registor(FSR).

I bought cheap thermistors "103AT-2" (50 yen for each) in AKihabara.

And this is a sample JavaScript code to calculate temperature in Celsius:

const R0 = 10000.0;
const T0 = 25.0;
const B = 3380.0;

const V = 5.0;
const R1 = 10000.0;

function temp(v) {
    var r = v * (R1 / (5.0 - v));
    var t = 1.0 / (1.0/B * Math.log(r/R0) + 1.0/(T0 + 273.0)) - 273.0
    return t;
}

I have confirmed that this cheap thermistor with the quation above achieves good accuracy of temeperature measurement.

I use MOSFET as a relay for turning LED on and off, mimicking a ceiling light.