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/*
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* Demonstrates how to use Read Buttons in conjunction with SoftRS485:
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*
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* If a button is pressed, a corresponding flag is set.
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* The main loop checks for the state of those flags and
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* sends a message on the RS485 bus whenever a flag is set.
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*
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* Additionally, the temperature is read from a DHT22 sensor once per minute
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*/
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// include the library code:
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#include <SoftRS485.h>
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#include <AM2302-Sensor.h>
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#define VERSION "1.2"
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#define BTN_INT 2 // button interrupt pin
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#define Max485_RO 3 // read-output of Max485
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#define Max485_RE 5 // not-read-enable of Max485
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#define Max485_DE 9 // data enable of Max485
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#define Max485_DI 8 // data input of Max485
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#define TRESHOLD 1024
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#define DHT_PIN 4
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#define PERIOD 100000000 // 100s
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#define ID 0
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// 0=Test
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// 1=Arbeitszimmer
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// 2=Küche
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// 3=Bad
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//#define LOG_TO_SERIAL
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#define SEND_485
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AM2302::AM2302_Sensor am2302{DHT_PIN};
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boolean raw_states[8];
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boolean states[8];
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unsigned long capacitor[8];
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unsigned long times[8];
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unsigned long sensor_time = PERIOD;
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void setup(){
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for (int i=0; i<8;i++) {
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capacitor[i] = 0;
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raw_states[i] = LOW;
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states[i] = LOW;
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}
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Serial.begin(115200);
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am2302.begin();
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init485(Max485_RO,Max485_RE,Max485_DE,Max485_DI); // library initialization:
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pinMode(BTN_INT,INPUT_PULLUP);
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pinMode(14,INPUT_PULLUP);
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pinMode(15,INPUT_PULLUP);
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pinMode(16,INPUT_PULLUP);
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pinMode(17,INPUT_PULLUP);
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pinMode(18,INPUT_PULLUP);
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pinMode(19,INPUT_PULLUP);
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pinMode(20,INPUT_PULLUP);
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pinMode(21,INPUT_PULLUP);
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attachInterrupt(digitalPinToInterrupt(BTN_INT),isr,CHANGE);
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// Print a message to the LCD.
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String s = "{nano:"+String(ID)+",revision:2.0,TempSender:"+VERSION+"}";
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Serial.println(s);
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send485(s.c_str());
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#ifdef LOG_TO_SERIAL
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Serial.println("14 15 16 17 18 19 20 21");
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#endif
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}
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void isr(){
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raw_states[0] = analogRead(14)<400;
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raw_states[1] = analogRead(15)<400;
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raw_states[2] = analogRead(16)<400;
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raw_states[3] = analogRead(17)<400;
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raw_states[4] = analogRead(18)<400;
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raw_states[5] = analogRead(19)<400;
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raw_states[6] = analogRead(20)<400;
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raw_states[7] = analogRead(21)<400;
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#ifdef LOG_TO_SERIAL
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for (int i=0;i<8;i++){
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Serial.print(" ");
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Serial.print(raw_states[i]);
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Serial.print(" ");
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}
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Serial.println();
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#endif
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}
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void send(int btn, long duration){
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String s = "{nano:"+String(ID)+",btn:"+String(btn)+",ms:"+String(duration)+"}";
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#ifdef SEND_485
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for (int i = 0; i<10; i++){
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if (send485(s.c_str())) break;
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Serial.println("collision detected, trying again:");
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}
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#else
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Serial.println(s);
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#endif
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}
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void loop(){
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unsigned long now = micros();
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for (int i=0;i<8;i++){
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// we emulate a capacitor:
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// when the button is pressed, it slowly loads, if the button is released, it unloads.
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capacitor[i] = raw_states[i] ? capacitor[i]+1 : capacitor[i]>>1;
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// if the capacitor reaches a certain treshold, the state is changed
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boolean new_state = capacitor[i]>TRESHOLD;
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// TODO: drop state after a maximum HIGH time
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// when the state changes, the duration of the last state is calculated
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if (states[i] != new_state){
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long diff = (now - times[i])/1000;
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times[i] = now;
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if (states[i]) send(i+1,diff); // old state was HIGH → we are going LOW
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states[i] = new_state;
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}
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}
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if (now - sensor_time > PERIOD){
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sensor_time = now;
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auto status = am2302.read();
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if (status == 0){
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String s = "{nano:"+String(ID)+",temp:"+String(am2302.get_Temperature())+",humi:"+String(am2302.get_Hunidity())+"}";
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send485(s.c_str());
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}
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}
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}
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