Keith G / Mbed 2 deprecated IOTM-Crossing

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Dependencies:   EthernetInterface MQTT mbed-dsp mbed-rtos mbed

Fork of KL25Z_FFT_Demo_tony by Leicester Hackspace

main.cpp@3:54760764be66, 2016-01-08 (annotated)

Committer:
Condo2k4
Date:
Fri Jan 08 15:49:02 2016 +0000
Revision:
3:54760764be66
Parent:
2:aa24865dfef5
Child:
5:4152530c0cf5
Initial import

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tony1tf 0:b8c9dffbbe7e 1 // Audio Spectrum Display
tony1tf 0:b8c9dffbbe7e 2 // Copyright 2013 Tony DiCola (tony@tonydicola.com)
tony1tf 0:b8c9dffbbe7e 3 // Code ported from the guide at http://learn.adafruit.com/fft-fun-with-fourier-transforms?view=all
tony1tf 0:b8c9dffbbe7e 4 // mods by Tony Abbey to simplify code to drive tri-colour LED as a "colour organ"
tony1tf 0:b8c9dffbbe7e 5
tony1tf 0:b8c9dffbbe7e 6 #include "mbed.h"
tony1tf 0:b8c9dffbbe7e 7
Condo2k4 3:54760764be66 8 #include "EthernetInterface.h"
Condo2k4 3:54760764be66 9 #include "MQTTEthernet.h"
Condo2k4 3:54760764be66 10 #include "MQTTClient.h"
tony1tf 0:b8c9dffbbe7e 11
Condo2k4 3:54760764be66 12 #define IP_RETRIES 2
Condo2k4 3:54760764be66 13 #define HOSTNAME "192.168.0.1"
Condo2k4 3:54760764be66 14 //#define HOSTNAME "doughnut.kent.ac.uk"
Condo2k4 3:54760764be66 15 #define PORT 1883
tony1tf 0:b8c9dffbbe7e 16
Condo2k4 3:54760764be66 17 enum Mode {RESPONCIVE, OVERRIDE};
tony1tf 0:b8c9dffbbe7e 18
Condo2k4 3:54760764be66 19 //buffers
Condo2k4 3:54760764be66 20 char mqtt_buffer[100];
Condo2k4 3:54760764be66 21 MQTT::Message message;
tony1tf 0:b8c9dffbbe7e 22
Condo2k4 3:54760764be66 23 //topics
Condo2k4 3:54760764be66 24 char personTopic[] = "shed/masterclass/iot/crossing/person";
Condo2k4 3:54760764be66 25 char modeTopic[] = "shed/masterclass/iot/crossing/mode";
tony1tf 0:b8c9dffbbe7e 26
Condo2k4 3:54760764be66 27 //io
Condo2k4 3:54760764be66 28 AnalogIn sensor(A0);
Condo2k4 3:54760764be66 29 DigitalOut GND(A2);
Condo2k4 3:54760764be66 30 DigitalOut pelican(D0);
Condo2k4 3:54760764be66 31 Ticker presenceTimer;
tony1tf 0:b8c9dffbbe7e 32
Condo2k4 3:54760764be66 33 //state
Condo2k4 3:54760764be66 34 bool personPresent = false;
Condo2k4 3:54760764be66 35 volatile Mode mode = RESPONCIVE;
Condo2k4 3:54760764be66 36 volatile bool checkPresence = false;
tony1tf 0:b8c9dffbbe7e 37
Condo2k4 3:54760764be66 38 void presenceTick() {
Condo2k4 3:54760764be66 39 checkPresence = true;
tony1tf 0:b8c9dffbbe7e 40 }
tony1tf 0:b8c9dffbbe7e 41
Condo2k4 3:54760764be66 42 void messageArrived(MQTT::MessageData& md) {
Condo2k4 3:54760764be66 43 MQTT::Message &msg = md.message;
Condo2k4 3:54760764be66 44 if(msg.payloadlen>0) {
Condo2k4 3:54760764be66 45 switch(*(char*)msg.payload) {
Condo2k4 3:54760764be66 46 case 'r': case 'R': mode = RESPONCIVE; pelican=personPresent; break;
Condo2k4 3:54760764be66 47 case 'o': case 'O': mode = OVERRIDE; pelican=true; break;
tony1tf 0:b8c9dffbbe7e 48 }
tony1tf 0:b8c9dffbbe7e 49 }
tony1tf 0:b8c9dffbbe7e 50 }
tony1tf 0:b8c9dffbbe7e 51
Condo2k4 3:54760764be66 52 int main() {
tony1tf 0:b8c9dffbbe7e 53
Condo2k4 3:54760764be66 54 MQTTEthernet ipstack;
Condo2k4 3:54760764be66 55 MQTT::Client<MQTTEthernet, Countdown> m_client(ipstack);
Condo2k4 3:54760764be66 56
Condo2k4 3:54760764be66 57 int ip_result;
Condo2k4 3:54760764be66 58 for(int i=0; i<IP_RETRIES; i++) {
Condo2k4 3:54760764be66 59 int ip_result = ipstack.connect(HOSTNAME, PORT);
Condo2k4 3:54760764be66 60 if(ip_result==0) break;
Condo2k4 3:54760764be66 61 }
Condo2k4 3:54760764be66 62 if (ip_result != 0) {
Condo2k4 3:54760764be66 63 error("IP stack failed");
Condo2k4 3:54760764be66 64 }
Condo2k4 3:54760764be66 65 if(m_client.connect()!=MQTT::SUCCESS) {
Condo2k4 3:54760764be66 66 error("MQTT connection failed");
Condo2k4 3:54760764be66 67 }
Condo2k4 3:54760764be66 68 if(m_client.subscribe(modeTopic, MQTT::QOS0, messageArrived)!=MQTT::SUCCESS) {
Condo2k4 3:54760764be66 69 error("MQTT subscribe failed");
tony1tf 0:b8c9dffbbe7e 70 }
Condo2k4 3:54760764be66 71
Condo2k4 3:54760764be66 72 GND = 0; //provide sensor with ground
Condo2k4 3:54760764be66 73
Condo2k4 3:54760764be66 74 presenceTimer.attach_us(&presenceTick,50000);
Condo2k4 3:54760764be66 75
tony1tf 0:b8c9dffbbe7e 76 while(1) {
Condo2k4 3:54760764be66 77
Condo2k4 3:54760764be66 78 sleep();
Condo2k4 3:54760764be66 79
Condo2k4 3:54760764be66 80 if(checkPresence) {
Condo2k4 3:54760764be66 81 float s = sensor;
Condo2k4 3:54760764be66 82 if((s<0.5f)!=personPresent) { //state changed
Condo2k4 3:54760764be66 83 if(personPresent) {
Condo2k4 3:54760764be66 84 //last person left
Condo2k4 3:54760764be66 85 personPresent = false;
Condo2k4 3:54760764be66 86 } else {
Condo2k4 3:54760764be66 87 //person arrived
Condo2k4 3:54760764be66 88 personPresent = true;
Condo2k4 3:54760764be66 89 }
Condo2k4 3:54760764be66 90
Condo2k4 3:54760764be66 91 sprintf(mqtt_buffer, "{\"personPresent\":%d}", personPresent);
Condo2k4 3:54760764be66 92 message.qos = MQTT::QOS0; // Send at least once
Condo2k4 3:54760764be66 93 // Do not null terminate -- we have a length field, and it will piss off the JS front end
Condo2k4 3:54760764be66 94 message.payloadlen = strlen(mqtt_buffer);
Condo2k4 3:54760764be66 95 message.payload = (void*)mqtt_buffer;
Condo2k4 3:54760764be66 96 m_client.publish(personTopic, message);
Condo2k4 3:54760764be66 97
Condo2k4 3:54760764be66 98 if(mode==RESPONCIVE) {
Condo2k4 3:54760764be66 99 pelican = personPresent;
tony1tf 1:7c7539fba82b 100 }
tony1tf 1:7c7539fba82b 101 }
Condo2k4 3:54760764be66 102 checkPresence = false;
tony1tf 0:b8c9dffbbe7e 103 }
Condo2k4 3:54760764be66 104
Condo2k4 3:54760764be66 105 m_client.yield(100);
tony1tf 0:b8c9dffbbe7e 106 }
Condo2k4 3:54760764be66 107
Condo2k4 3:54760764be66 108
Condo2k4 3:54760764be66 109 /*
Condo2k4 3:54760764be66 110 */
Condo2k4 3:54760764be66 111 }